US20100230402A1 - Apparatus for porous material densification - Google Patents
Apparatus for porous material densification Download PDFInfo
- Publication number
- US20100230402A1 US20100230402A1 US12/376,391 US37639107A US2010230402A1 US 20100230402 A1 US20100230402 A1 US 20100230402A1 US 37639107 A US37639107 A US 37639107A US 2010230402 A1 US2010230402 A1 US 2010230402A1
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- Prior art keywords
- spiral
- induction heating
- coil
- induction
- coils
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- 238000000280 densification Methods 0.000 title claims description 59
- 239000011148 porous material Substances 0.000 title claims description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 70
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- 238000000034 method Methods 0.000 claims abstract description 36
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- 239000010949 copper Substances 0.000 claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 239000002243 precursor Substances 0.000 claims abstract description 19
- 229910052751 metal Inorganic materials 0.000 claims abstract description 16
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- 230000008021 deposition Effects 0.000 claims abstract 2
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- 239000000463 material Substances 0.000 claims description 8
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- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 6
- 238000003754 machining Methods 0.000 claims description 6
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- 238000004519 manufacturing process Methods 0.000 claims description 5
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 3
- 238000000197 pyrolysis Methods 0.000 claims description 3
- 238000005219 brazing Methods 0.000 claims description 2
- 238000000151 deposition Methods 0.000 claims description 2
- 230000000712 assembly Effects 0.000 claims 3
- 238000000429 assembly Methods 0.000 claims 3
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 claims 2
- RGSFGYAAUTVSQA-UHFFFAOYSA-N Cyclopentane Chemical compound C1CCCC1 RGSFGYAAUTVSQA-UHFFFAOYSA-N 0.000 claims 2
- HGCIXCUEYOPUTN-UHFFFAOYSA-N cyclohexene Chemical compound C1CCC=CC1 HGCIXCUEYOPUTN-UHFFFAOYSA-N 0.000 claims 2
- 239000003350 kerosene Substances 0.000 claims 2
- UAEPNZWRGJTJPN-UHFFFAOYSA-N methylcyclohexane Chemical compound CC1CCCCC1 UAEPNZWRGJTJPN-UHFFFAOYSA-N 0.000 claims 2
- 238000000926 separation method Methods 0.000 claims 2
- DMEGYFMYUHOHGS-UHFFFAOYSA-N heptamethylene Natural products C1CCCCCC1 DMEGYFMYUHOHGS-UHFFFAOYSA-N 0.000 claims 1
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- 238000005452 bending Methods 0.000 abstract description 5
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- 238000009835 boiling Methods 0.000 description 7
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- 229910052581 Si3N4 Inorganic materials 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 229910010271 silicon carbide Inorganic materials 0.000 description 6
- 229910002804 graphite Inorganic materials 0.000 description 5
- 239000010439 graphite Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 235000012771 pancakes Nutrition 0.000 description 5
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- 238000011068 loading method Methods 0.000 description 4
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 4
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- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
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- 239000012530 fluid Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910000077 silane Inorganic materials 0.000 description 2
- -1 silane compound Chemical class 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 206010002329 Aneurysm Diseases 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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- 238000005859 coupling reaction Methods 0.000 description 1
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- LIKFHECYJZWXFJ-UHFFFAOYSA-N dimethyldichlorosilane Chemical compound C[Si](C)(Cl)Cl LIKFHECYJZWXFJ-UHFFFAOYSA-N 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000002783 friction material Substances 0.000 description 1
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- 230000007246 mechanism Effects 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000005055 methyl trichlorosilane Substances 0.000 description 1
- JLUFWMXJHAVVNN-UHFFFAOYSA-N methyltrichlorosilane Chemical compound C[Si](Cl)(Cl)Cl JLUFWMXJHAVVNN-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000001282 organosilanes Chemical class 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/105—Induction heating apparatus, other than furnaces, for specific applications using a susceptor
- H05B6/108—Induction heating apparatus, other than furnaces, for specific applications using a susceptor for heating a fluid
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
- C04B35/565—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide
- C04B35/571—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide obtained from Si-containing polymer precursors or organosilicon monomers
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
- C04B35/584—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride
- C04B35/591—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride obtained by reaction sintering
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/71—Ceramic products containing macroscopic reinforcing agents
- C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
- C04B35/80—Fibres, filaments, whiskers, platelets, or the like
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/71—Ceramic products containing macroscopic reinforcing agents
- C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
- C04B35/80—Fibres, filaments, whiskers, platelets, or the like
- C04B35/83—Carbon fibres in a carbon matrix
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/04—Coating on selected surface areas, e.g. using masks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Composition of linings ; Methods of manufacturing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Composition of linings ; Methods of manufacturing
- F16D69/023—Composite materials containing carbon and carbon fibres or fibres made of carbonizable material
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/36—Coil arrangements
- H05B6/362—Coil arrangements with flat coil conductors
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/48—Organic compounds becoming part of a ceramic after heat treatment, e.g. carbonising phenol resins
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/48—Organic compounds becoming part of a ceramic after heat treatment, e.g. carbonising phenol resins
- C04B2235/483—Si-containing organic compounds, e.g. silicone resins, (poly)silanes, (poly)siloxanes or (poly)silazanes
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/72—Products characterised by the absence or the low content of specific components, e.g. alkali metal free alumina ceramics
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/4902—Electromagnet, transformer or inductor
Definitions
- the present invention relates to densifying porous articles with a desirably high rate of production, particularly, but not necessarily only, with respect to the field of friction braking articles, such as aircraft brakes.
- friction members In the field of friction materials, it is generally known to use porous material substrates to manufacture friction members, such as friction brake disks.
- the manufacture of such friction members generally begins with the construction of a porous preform.
- annular preforms are used.
- the annular preforms can be constructed using several different known methods. For example, carbon fiber fabric plies can be needled together and annular preforms can be cut from the stacked material.
- Oxidized polyacrylonitride (“PAN”) fibers or pitch-based fibers are common examples of starting fibers used in this type of application. Subsequently, these fibers may be carbonized in a high temperature treatment step prior densification.
- porous preforms are densified.
- a generally known method of densification uses a liquid precursor of a material that deposited within the porous preform to densify the preform. This kind of densification is sometimes referred to in the art as “film boiling.”
- film boiling densification involves immersing a porous preform in a liquid hydrocarbon so that the liquid substantially completely infiltrates the pores and interstices of the preform. Thereafter, the immersed preform is inductively heated to a temperature above the decomposition temperature of liquid hydrocarbon (typically 1000° C. or more, typically up to about 1400° C.). More particularly, the liquid hydrocarbon adjacent to the inductively heated preform structure dissociates into various gas phase species within the preform porosity. Further thermal decomposition of the gas phase species results in the formation of pyrolitic carbon on interior surfaces in the open regions of the porous material.
- a temperature above the decomposition temperature of liquid hydrocarbon typically 1000° C. or more, typically up to about 1400° C.
- the liquid hydrocarbon adjacent to the inductively heated preform structure dissociates into various gas phase species within the preform porosity. Further thermal decomposition of the gas phase species results in the formation of pyrolitic carbon on interior surfaces in the open regions of the porous material.
- FIG. 1 is a cutaway schematic side view of a liquid densification apparatus
- FIG. 2 is a cutaway schematic top view of a liquid densification apparatus generally corresponding to that seen in FIG. 1 ;
- FIG. 3 is a schematic cross sectional view of a porous article mounted relative to conventional induction coils for inductively heating the article;
- FIG. 4 is a schematic cross sectional view of a porous article mounted relative to induction coils according to the present invention, for inductively heating the article;
- FIG. 5 is a close-up cross sectional view of a part of an induction coil as illustrated in FIG. 4 ;
- FIG. 6 is an enlarged partial view of the arrangement illustrated in FIG. 4 ;
- FIG. 7 is a schematic side view illustrating an arrangement for mounting a porous article in the apparatus of the present invention.
- FIG. 8 is a schematic perspective view of an exemplary apparatus for liquid densification of multiple porous articles
- FIG. 9 is a schematic cross sectional view of an exemplary apparatus for liquid densification of multiple porous articles.
- FIGS. 10-12 are X-ray images of a densified porous preform for illustrating an effect that the structure of the inductive heating coils has on densification.
- a typical densification facility includes one or more reactor chambers generally sized and constructed to hold one or more preform members therein, with corresponding induction heating coils, while substantially immersed in the liquid precursor of choice.
- the reactor chambers could be suitably manufactured from aluminum.
- suitable materials are non-magnetic and include, without limitation, glass, stainless steel, ceramic or combinations thereof.
- Dedicated inner buses and coils are provided depending on the size of the preforms being densified. Typical examples of preform diameters range from about 10′′ to about 25′′ and the thickness ranges from 15 mm to 50 mm. Particularly common examples include 15′′ and 20′′ diameter preforms.
- the one or more reaction chambers are each provided with induction heating coils corresponding to each preform that is to be processed.
- the induction coils and the preforms being processed are preferably mounted in position relative to each other using chemically non-reactive and thermally stable supports made from, for example, an electrically non-conductive glass composite material that can withstand a liquid hydrocarbon environment (such as that known in the art as “G-10”).
- the induction heating coils are preferably water-cooled pancake spiral coils, and are commonly made from copper metal. For this reason, it is desirable to provide a heat exchanger dedicated to the water-cooling system for the induction coils, as will be discussed in further detail below.
- a preform (or worn brake) being densified is heated by direct coupling from the induction coil.
- FIGS. 1 and 2 are side and top schematic view of a coil/reactor chamber 100 generally in accordance with the present invention. Loading and unloading of one or more preforms 160 require, for example, a locking mechanism is provided for the selectably openable top lid 150 .
- Each reactor chamber 100 (as many as are provided) is connected with a common precursor supply line 180 and a common exhaust line 140 to the condenser and thermal oxidizer.
- Each reactor chamber 100 can be filled, drained, and monitored from the computer control system. The exhaust vapor from the densification process is condensed and fed back to the reactors, whereas the residual effluent gas is preferably then taken to a conventional thermal oxidizer (not shown) and burned.
- the center of the preform initially be heated above the pyrolysis temperature of the precursor liquid.
- the frequency of the power supply is set (in view of the material characteristics of the preform) to provide a skin depth roughly near the center of the preform.
- the frequency of the power supply increases in response to changes in the electrical characteristics of the preform caused by densification.
- the induction coils in a respective reaction chamber are associated with a corresponding power supply.
- a commercially-available power supply suitable for this application is a Model No. LSP 14-400/30 Lepel induction-type power supply.
- the power from the power supply is transferred to the induction coils by custom-built (depending on the physical arrangements of a given densification facility) copper bus bars with external water cooling networks.
- the Lepel power supply for example, has remote PID loop control capability and can be monitored and controlled from a computer control terminal. Power density, voltage control, current control, frequency control, and/or temperature control of the densification process by known methods is also within the scope of the contemplated arrangement.
- the system includes a conventional fluid transfer system for managing the transport of new (and used) precursor liquid (not shown).
- the fuel transfer system may include one or more remote storage tanks for storing a new liquid precursor supply as well as possibly temporarily storing used precursor liquid. A relatively smaller local storage tank for new precursor liquid can also be provided.
- a precursor liquid used according to the present system is cyclohexane (C 6 H 12 ).
- the corresponding deposited material could be any of, strictly by way of example and without limitation, carbon, silicon carbide, silicon nitride, carbon-silicon carbide, or carbon-silicon nitride.
- a hydrocarbon such as cyclohexane, n-hexane, benzene, toluene, or combinations thereof can be used.
- Methyltrichlorosilane, dimethyldichlorosilane, and methydichiorosilane, tris-n-methyl amino silane, or other organosilane mixtures can be used for depositing silicon carbide and silicon nitride.
- the precursor liquid can be chosen to co-deposit materials.
- a mixture of silicon carbide and silicon nitride can be deposited using tris-n-methyl amino or other silane compound.
- co-deposited materials such as carbon-silicon carbide and carbon-silicon nitride can be produced with an appropriately selected mixture of precursors.
- silicon carbide or silicon nitride interface coating can be produced during an early stage of the densification or co-deposited throughout the matrix densification.
- sufficient liquid precursor is provided to substantially immerse the preform being densified, as well as the induction heating coils associated therewith.
- the film boiling process creates gaseous species that eventually cause the formation of pyrolitic carbon on interior surfaces of the preform porosity.
- Precursor vapor is preferably captured to the extent possible and condensed for possible recycling in the process.
- Effluent gas that is still left over is preferably conveyed to a thermal oxidizer of a known configuration to burn off residual hydrocarbons in the effluent gas.
- the structure of the induction coils 130 used in film boiling densification processes is very important for obtaining densified preforms having suitable mechanical characteristics, including friction characteristics.
- FIG. 3 shows a particular difference between the convention inductive coil of FIG. 3 and that of FIG. 4 .
- the prior induction heating coil 200 shown in FIG. 3 is made from square or round hollow copper tubing 230 bent into the desired coil form.
- the copper tubing functions both to transmit the power for inductive heating (through the copper metal) and convey cooling water through the inlet port 250 and the outlet port 260 .
- the coil 200 of FIG. 3 has, for example, a nominal 3 ⁇ 4′′ gap with an inner diameter (ID) coverage of 18′′ and an outer diameter (OD) coverage of 8.5′′.
- FIG. 3 shows a carbonized preform 240 placed inside of an alumina holder 220 and supported with a G-10 holder 270 .
- FIG. 4 shows an example of an induction heating coil 300 according to the present invention is fabricated from, for example, 1 ⁇ 4′′ solid copper plate that is milled or otherwise machined into the desired coil form 330 , instead of being turned or bent into shape as the coil in FIG. 3 is.
- a high precision machining operation is used to form the coil from the copper plate, such as, for example, CNC milling and the like.
- a hollow metal (copper, for example) water cooling tube 335 is brazed on an exterior (i.e., opposite the side facing the preform in use) side of the machined copper coil 330 .
- the braze composition may be any commercially available composition suitable for brazing copper as long as it can withstand the expected temperature environment.
- the currently contemplated induction coil uses a machined flat copper plate, it can be produced with greater precision (particularly with respect to gaps between turns of the coil) than bending copper tubing.
- the machined copper plate does not undergo stress and strain deformation like bent copper tubing.
- a gap between adjacent turns of the coil according to the invention is substantially consistent, and is between about 4 mm to about 8 mm.
- the conventional copper tube becomes distended and at least susceptible to rupture (in a manner not unlike a vascular aneurysm) (if rupture does not in fact occur). It is tentatively believed that the conventional copper tube induction coil can become too hot for the cooling water to adequately dissipate the heat. It is speculated that this can cause vaporization of the cooling water within the conventional copper tubing with an unacceptable pressure increase therein. This pressure is believed to result in the bulging tubing deformation and an elevated risk of tube rupture.
- a prior induction coil made from copper tubing suffers from a spiral densification characteristic and weak densification at the radially inner and outer peripheries, as can be seen below in FIGS. 10 and 11 .
- “Spiral densification” is an art-recognized term which generally refers to non-homogenous densification, particularly characterized by generally circumferential “streaks”—regions in which the densification is non-trivially different from adjacent regions. This problem is significantly related to imperfections in coil design, especially with respect to the gap distance between adjacent turns of the coil. It will be appreciated that if the coil structure is not carefully monitored, gaps between coil turns may occur that lead to insufficient heating of the adjacent preform. This results in turn in poor densification. In addition, pancake coil distance is usually in a fixed position which does not allow for any adjustment for the depth penetration.
- the preforms illustrated in FIGS. 10 and 11 were formed with a conventional copper tubing induction coil in a film boiling densification process. In both images, large, circumferentially extending regions of density variation are evident. In particular, a region of very low density (corresponding to the white region at approximately the “10 o'clock” position of both preforms is noticeable. In addition, as mentioned above, poor densification can be seen, for example, at the radially outward periphery of the preforms. See, for example, the white region along approximately the bottom halves of each X-ray scan.
- FIG. 12 is a similar type of X-ray scan which illustrates the densification of a preform densified using an induction coil made from a machined copper plate and having a cooling water tube brazed thereto, as described above with reference to FIG. 4 .
- the important feature to note between FIGS. 10 and 11 relative to FIG. 12 is the absence of distinct or prominent circumferentially extending blotches and the like in FIG. 12 (unlike in FIGS. 10 and 11 ), which indicate large variations in densification levels, and more particularly, regions of undesirably low densification.
- FIG. 5 hereinbelow is a cross-sectional view of one segment of an induction coil according to the present invention.
- a cooling water tube 400 brazed to an exterior (with respect to a preform being densified) side of the machined copper coil 402 used as the induction heating coil.
- a mounting fixture, such as a bolt shaft 401 may be attached to an exterior of the cooling water tube 400 for mounting the coil to a support within the reaction chamber.
- the reaction chamber according to the present invention includes at least one induction heating coil as described herein, for inductively heating a preform mounted adjacent thereto.
- induction heating coil as described herein, for inductively heating a preform mounted adjacent thereto.
- pairs of coils are provided and a preform being treating is mounted between them.
- preforms are generally soft and pliable before being densified. Therefore, it is desirable to hold a preform relative to the inductive heating coil in such a manner so as to reduce bending and other forms of warping or deformation before the preform is densified.
- support members may be used to hold the preform in place. See, for example, FIGS. 6 and 7 .
- the preform is held in place by one or more supports 530 mounted, for example, on the same supports on which the induction coils are mounted.
- the supports may be, for example, non-reactive quartz glass or alumina cylinders having an appropriately sized and aligned notch formed therein.
- the radial (with respect to the preform) position of some or all of the supports can be adjusted to, for example, accommodate insertion of the preform relative to the heating coils, or to accommodate preforms of different diameters.
- the distance between coils and the preform can be adjusted by screwing in or out of the bolt shaft 520 (corresponding to the bolt shaft 401 seen in FIG. 5 ) in order to provide effective heating during initial densification. Control of this spacing between the induction coils and the preform can help control current concentrations in the preform during inductive heating, so as to avoid “mirror effect” or “spiral” densification on the one hand, and to increase power yield by not spacing the coil too far away from the preform.
- FIG. 8 hereinbelow is a perspective view of a reaction chamber 700 according to the present invention into which three preforms (and associated induction heating coils) are loaded. This illustration is strictly by way of example to illustrate the densification of multiple porous parts, and other loading arrangements with other numbers of preforms are possible.
- the multiple-part densification shows another way of producing carbon disks in at least a three-part densification configuration.
- the liquid precursor is supplied to the reaction chamber 700 through ports 710 .
- the power from the power supply is transferred to the induction coils 730 by appropriately arranged (depending on the physical arrangements of a given densification facility) copper bus bars 760 with external water cooling networks.
- the Lepel power supply for example, has remote PID loop control capability and can be monitored and controlled from a computer control terminal. Power density, voltage control, current control, and/or temperature control of the densification process by known methods is also within the scope of the contemplated arrangement.
- the liquid precursor is supplied to the reaction chamber(s) 700 from the local precursor storage tank.
- sufficient liquid precursor is provided to substantially immerse the preform(s) being densified, as well as the induction heating coils associated therewith.
- the film boiling process creates gaseous species that in part causes the formation of pyrolitic carbon on interior surfaces of the preform porosity.
- Precursor vapor is released thru an exhaust line 720 and vented to an external condenser (not shown) for possible recycling in the process. Effluent gas that is still left over is preferably conveyed to a thermal oxidizer (not shown).
- each reactor chamber 700 (as many as are provided) is connected with a common precursor supply line and a common exhaust line 720 to the condenser and thermal oxidizer.
- Each reactor chamber can be filled, drained, and monitored from the computer control system. The exhaust vapor from the densification process is condensed and fed back to the reactors, whereas the residual effluent gas is then taken to the thermal oxidizer and burned.
- FIG. 9 illustrates another arrangement for the liquid densification of multiple porous parts.
- This illustration shows the densification of multiple porous parts 870 inside of a sealed reaction chamber 800 .
- a load stack consisting of multiple porous parts 870 and graphite plates 860 therebetween are pre-assembled.
- the load stack is placed on a ceramic or electrically insulated stand 890 and the furnace lid 805 is removed during the loading and unloading operation.
- the power from the power supply is transferred to the multi-zone coil 810 , 820 , and 830 through power port 880 .
- Individual PID zone control is made possible through power density, voltage control, current control, frequency control, and/or temperature control for the densification process.
- the heating of the porous parts 870 is accomplished by using, for example, a multi-zone induction coil 810 , 820 , 830 which is directly coupled to the graphite plates 860 .
- the annular graphite plates 860 have similar ID and OD dimensions as the annular porous parts and the thickness of the annular graphite plate ranges between 5 mm to 25 mm.
- the densification fronts start from the heated preform surfaces which are in contact with the graphite plates 860 .
- Liquid precursor is supplied to the reactor chamber 800 and the liquid can be filled and drained through port 895 .
- a liquid level indicator 840 indicates the level of precursor fluid during the fill, drain, and densification.
- Sufficient liquid precursor is provided to substantially immerse the load stack inside of the reactor chamber cavity 806 .
- a continuous feed of liquid precursor is also possible during the densification process.
- the densification process creates gaseous species and the vapor is released from port 850 and directed to the condenser for possible recycling purpose. Effluent gas that is not captured is conveyed to the thermal oxidizer to burn off the residual hydrocarbons.
- a mounting assembly could be provided at the center of a given preform that could be appropriately connected to a driving device located outside of the respective reaction chamber.
- the rate of rotation of the preform might be from about one to about five revolutions per minute, as currently contemplated.
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Abstract
The present invention relates to an inductive heating apparatus, particularly using a liquid deposition precursor, for densifying porous articles. The inductive heating apparatus using induction coils that are made from machined or milled flat metal plates, such as copper plate, instead of bending a member (especially a hollow member) into a coil shape. The induction coils according to the present invention can be more precisely and more consistently fabricated than conventional bending techniques.
Description
- This application claims the benefit of priority from U.S. Provisional Application No. 60/821,596 filed on Aug. 7, 2007, the entire content of which is incorporated by reference herein.
- The present invention relates to densifying porous articles with a desirably high rate of production, particularly, but not necessarily only, with respect to the field of friction braking articles, such as aircraft brakes.
- In the field of friction materials, it is generally known to use porous material substrates to manufacture friction members, such as friction brake disks.
- The manufacture of such friction members generally begins with the construction of a porous preform. For example, in many friction brake applications, annular preforms are used. The annular preforms can be constructed using several different known methods. For example, carbon fiber fabric plies can be needled together and annular preforms can be cut from the stacked material. Oxidized polyacrylonitride (“PAN”) fibers or pitch-based fibers are common examples of starting fibers used in this type of application. Subsequently, these fibers may be carbonized in a high temperature treatment step prior densification.
- Thereafter, the porous preforms are densified. A generally known method of densification uses a liquid precursor of a material that deposited within the porous preform to densify the preform. This kind of densification is sometimes referred to in the art as “film boiling.”
- In general, film boiling densification involves immersing a porous preform in a liquid hydrocarbon so that the liquid substantially completely infiltrates the pores and interstices of the preform. Thereafter, the immersed preform is inductively heated to a temperature above the decomposition temperature of liquid hydrocarbon (typically 1000° C. or more, typically up to about 1400° C.). More particularly, the liquid hydrocarbon adjacent to the inductively heated preform structure dissociates into various gas phase species within the preform porosity. Further thermal decomposition of the gas phase species results in the formation of pyrolitic carbon on interior surfaces in the open regions of the porous material.
- The use of liquid precursors for densification is discussed in, for example, U.S. Pat. Nos. 4,472,454, 5,389,152, 5,397,595, 5,733,611, 5,547,717, 5,981,002, and 6,726,962. Each and every one of these documents is incorporated herein by reference in its entirety.
- The present invention will be even more clearly understandable with reference to the drawings appended hereto, in which:
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FIG. 1 is a cutaway schematic side view of a liquid densification apparatus; -
FIG. 2 is a cutaway schematic top view of a liquid densification apparatus generally corresponding to that seen inFIG. 1 ; -
FIG. 3 is a schematic cross sectional view of a porous article mounted relative to conventional induction coils for inductively heating the article; -
FIG. 4 is a schematic cross sectional view of a porous article mounted relative to induction coils according to the present invention, for inductively heating the article; -
FIG. 5 is a close-up cross sectional view of a part of an induction coil as illustrated inFIG. 4 ; -
FIG. 6 is an enlarged partial view of the arrangement illustrated inFIG. 4 ; -
FIG. 7 is a schematic side view illustrating an arrangement for mounting a porous article in the apparatus of the present invention; -
FIG. 8 is a schematic perspective view of an exemplary apparatus for liquid densification of multiple porous articles; -
FIG. 9 is a schematic cross sectional view of an exemplary apparatus for liquid densification of multiple porous articles; and -
FIGS. 10-12 are X-ray images of a densified porous preform for illustrating an effect that the structure of the inductive heating coils has on densification. - A typical densification facility according to the present invention includes one or more reactor chambers generally sized and constructed to hold one or more preform members therein, with corresponding induction heating coils, while substantially immersed in the liquid precursor of choice. For example, the reactor chambers could be suitably manufactured from aluminum. Other suitable materials are non-magnetic and include, without limitation, glass, stainless steel, ceramic or combinations thereof. Dedicated inner buses and coils are provided depending on the size of the preforms being densified. Typical examples of preform diameters range from about 10″ to about 25″ and the thickness ranges from 15 mm to 50 mm. Particularly common examples include 15″ and 20″ diameter preforms.
- The one or more reaction chambers are each provided with induction heating coils corresponding to each preform that is to be processed. The induction coils and the preforms being processed are preferably mounted in position relative to each other using chemically non-reactive and thermally stable supports made from, for example, an electrically non-conductive glass composite material that can withstand a liquid hydrocarbon environment (such as that known in the art as “G-10”).
- The induction heating coils are preferably water-cooled pancake spiral coils, and are commonly made from copper metal. For this reason, it is desirable to provide a heat exchanger dedicated to the water-cooling system for the induction coils, as will be discussed in further detail below. In use, a preform (or worn brake) being densified is heated by direct coupling from the induction coil.
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FIGS. 1 and 2 are side and top schematic view of a coil/reactor chamber 100 generally in accordance with the present invention. Loading and unloading of one ormore preforms 160 require, for example, a locking mechanism is provided for the selectably openabletop lid 150. - Each reactor chamber 100 (as many as are provided) is connected with a common
precursor supply line 180 and acommon exhaust line 140 to the condenser and thermal oxidizer. Eachreactor chamber 100 can be filled, drained, and monitored from the computer control system. The exhaust vapor from the densification process is condensed and fed back to the reactors, whereas the residual effluent gas is preferably then taken to a conventional thermal oxidizer (not shown) and burned. - For the preform to reach its full density, it is desirable that the center of the preform initially be heated above the pyrolysis temperature of the precursor liquid. As densification proceeds, the densification moves radially outwards from the center portions of the preform because of the heating profile created by induction heating. In one example, the frequency of the power supply is set (in view of the material characteristics of the preform) to provide a skin depth roughly near the center of the preform. As the center of the preform densifies, the frequency of the power supply increases in response to changes in the electrical characteristics of the preform caused by densification.
- Certain features of the presently contemplated invention are now discussed hereinbelow, and are distinguished where appropriate from conventional aspects of film boiling densification.
- In one contemplated example, the induction coils in a respective reaction chamber are associated with a corresponding power supply. An example of a commercially-available power supply suitable for this application is a Model No. LSP 14-400/30 Lepel induction-type power supply.
- The power from the power supply is transferred to the induction coils by custom-built (depending on the physical arrangements of a given densification facility) copper bus bars with external water cooling networks.
- The Lepel power supply, for example, has remote PID loop control capability and can be monitored and controlled from a computer control terminal. Power density, voltage control, current control, frequency control, and/or temperature control of the densification process by known methods is also within the scope of the contemplated arrangement.
- An appropriate liquid precursor is supplied to the reaction chamber(s) from a precursor storage tank. The system includes a conventional fluid transfer system for managing the transport of new (and used) precursor liquid (not shown). The fuel transfer system may include one or more remote storage tanks for storing a new liquid precursor supply as well as possibly temporarily storing used precursor liquid. A relatively smaller local storage tank for new precursor liquid can also be provided.
- One example of a precursor liquid used according to the present system is cyclohexane (C6H12). However, depending on the selection of the precursor liquid, the corresponding deposited material could be any of, strictly by way of example and without limitation, carbon, silicon carbide, silicon nitride, carbon-silicon carbide, or carbon-silicon nitride. To deposit carbon within the preform, for example, a hydrocarbon such as cyclohexane, n-hexane, benzene, toluene, or combinations thereof can be used. Methyltrichlorosilane, dimethyldichlorosilane, and methydichiorosilane, tris-n-methyl amino silane, or other organosilane mixtures can be used for depositing silicon carbide and silicon nitride.
- Moreover, the precursor liquid can be chosen to co-deposit materials. For example, a mixture of silicon carbide and silicon nitride can be deposited using tris-n-methyl amino or other silane compound. Also, co-deposited materials such as carbon-silicon carbide and carbon-silicon nitride can be produced with an appropriately selected mixture of precursors. Depending upon the desired matrix, silicon carbide or silicon nitride interface coating can be produced during an early stage of the densification or co-deposited throughout the matrix densification.
- Preferably, sufficient liquid precursor is provided to substantially immerse the preform being densified, as well as the induction heating coils associated therewith. As mentioned before, the film boiling process creates gaseous species that eventually cause the formation of pyrolitic carbon on interior surfaces of the preform porosity. Precursor vapor is preferably captured to the extent possible and condensed for possible recycling in the process. Effluent gas that is still left over is preferably conveyed to a thermal oxidizer of a known configuration to burn off residual hydrocarbons in the effluent gas.
- The structure of the induction coils 130 used in film boiling densification processes is very important for obtaining densified preforms having suitable mechanical characteristics, including friction characteristics.
- Using conventional pancake coils constructed from hollow copper tubing (square or round), as illustrated in
FIG. 3 for example, can result in undesirable “spiral” densification (sometimes referred to as a “mirror effect”) corresponding to the constructions of spiral induction coil. It has been determined that conventional copper tubing is relatively difficult to form (i.e., bend) into a pancake coil, particularly with respect to maintaining a consistent gap between adjacent turns of the coil. In turn, the desire to maintain a consistent (and relatively small) gap between coil turns causes manufacturing and structural issues with respect to suitably bending the copper tubing to provide the tight turns necessary. - A particular difference between the convention inductive coil of
FIG. 3 and that ofFIG. 4 is the fact that the priorinduction heating coil 200 shown inFIG. 3 is made from square or roundhollow copper tubing 230 bent into the desired coil form. The copper tubing functions both to transmit the power for inductive heating (through the copper metal) and convey cooling water through theinlet port 250 and theoutlet port 260. Thecoil 200 ofFIG. 3 has, for example, a nominal ¾″ gap with an inner diameter (ID) coverage of 18″ and an outer diameter (OD) coverage of 8.5″. For the purpose of illustration,FIG. 3 shows acarbonized preform 240 placed inside of analumina holder 220 and supported with a G-10holder 270. - In contrast,
FIG. 4 shows an example of aninduction heating coil 300 according to the present invention is fabricated from, for example, ¼″ solid copper plate that is milled or otherwise machined into the desiredcoil form 330, instead of being turned or bent into shape as the coil inFIG. 3 is. Preferably, a high precision machining operation is used to form the coil from the copper plate, such as, for example, CNC milling and the like. A hollow metal (copper, for example)water cooling tube 335 is brazed on an exterior (i.e., opposite the side facing the preform in use) side of the machinedcopper coil 330. The braze composition may be any commercially available composition suitable for brazing copper as long as it can withstand the expected temperature environment. - Because the currently contemplated induction coil uses a machined flat copper plate, it can be produced with greater precision (particularly with respect to gaps between turns of the coil) than bending copper tubing. In addition, the machined copper plate does not undergo stress and strain deformation like bent copper tubing.
- A gap between adjacent turns of the coil according to the invention is substantially consistent, and is between about 4 mm to about 8 mm.
- In addition, it has been observed that in some cases, the conventional copper tube becomes distended and at least susceptible to rupture (in a manner not unlike a vascular aneurysm) (if rupture does not in fact occur). It is tentatively believed that the conventional copper tube induction coil can become too hot for the cooling water to adequately dissipate the heat. It is speculated that this can cause vaporization of the cooling water within the conventional copper tubing with an unacceptable pressure increase therein. This pressure is believed to result in the bulging tubing deformation and an elevated risk of tube rupture.
- The possibility that the copper tubing could rupture during a densification process cannot be neglected, bearing in mind that the coil is immersed in a liquid hydrocarbon precursor during densification. If cooling water were to escape the coil during densification (for example, because of a tubing failure), the water would flash to steam, which would provide an oxygen source. Because the liquid hydrocarbon is typically already above its self-combustion temperature during densification, the introduction of an oxygen source would present a grave risk of explosion.
- Also, a prior induction coil made from copper tubing (such as that illustrated in
FIG. 3 ) suffers from a spiral densification characteristic and weak densification at the radially inner and outer peripheries, as can be seen below inFIGS. 10 and 11 . - “Spiral densification” is an art-recognized term which generally refers to non-homogenous densification, particularly characterized by generally circumferential “streaks”—regions in which the densification is non-trivially different from adjacent regions. This problem is significantly related to imperfections in coil design, especially with respect to the gap distance between adjacent turns of the coil. It will be appreciated that if the coil structure is not carefully monitored, gaps between coil turns may occur that lead to insufficient heating of the adjacent preform. This results in turn in poor densification. In addition, pancake coil distance is usually in a fixed position which does not allow for any adjustment for the depth penetration.
- The preforms illustrated in
FIGS. 10 and 11 were formed with a conventional copper tubing induction coil in a film boiling densification process. In both images, large, circumferentially extending regions of density variation are evident. In particular, a region of very low density (corresponding to the white region at approximately the “10 o'clock” position of both preforms is noticeable. In addition, as mentioned above, poor densification can be seen, for example, at the radially outward periphery of the preforms. See, for example, the white region along approximately the bottom halves of each X-ray scan. -
FIG. 12 is a similar type of X-ray scan which illustrates the densification of a preform densified using an induction coil made from a machined copper plate and having a cooling water tube brazed thereto, as described above with reference toFIG. 4 . The important feature to note betweenFIGS. 10 and 11 relative toFIG. 12 is the absence of distinct or prominent circumferentially extending blotches and the like inFIG. 12 (unlike inFIGS. 10 and 11 ), which indicate large variations in densification levels, and more particularly, regions of undesirably low densification. -
FIG. 5 hereinbelow is a cross-sectional view of one segment of an induction coil according to the present invention. A coolingwater tube 400 brazed to an exterior (with respect to a preform being densified) side of the machinedcopper coil 402 used as the induction heating coil. A mounting fixture, such as abolt shaft 401 may be attached to an exterior of the coolingwater tube 400 for mounting the coil to a support within the reaction chamber. - As discussed above, the reaction chamber according to the present invention includes at least one induction heating coil as described herein, for inductively heating a preform mounted adjacent thereto. In a typical arrangement, pairs of coils are provided and a preform being treating is mounted between them.
- It is known in the art that preforms are generally soft and pliable before being densified. Therefore, it is desirable to hold a preform relative to the inductive heating coil in such a manner so as to reduce bending and other forms of warping or deformation before the preform is densified.
- In one arrangement, support members may be used to hold the preform in place. See, for example,
FIGS. 6 and 7 . In the above-illustrated example, the preform is held in place by one ormore supports 530 mounted, for example, on the same supports on which the induction coils are mounted. The supports may be, for example, non-reactive quartz glass or alumina cylinders having an appropriately sized and aligned notch formed therein. As indicated by the bidirectional radially extending arrows inFIGS. 6 and 7 , the radial (with respect to the preform) position of some or all of the supports can be adjusted to, for example, accommodate insertion of the preform relative to the heating coils, or to accommodate preforms of different diameters. - The distance between coils and the preform can be adjusted by screwing in or out of the bolt shaft 520 (corresponding to the
bolt shaft 401 seen inFIG. 5 ) in order to provide effective heating during initial densification. Control of this spacing between the induction coils and the preform can help control current concentrations in the preform during inductive heating, so as to avoid “mirror effect” or “spiral” densification on the one hand, and to increase power yield by not spacing the coil too far away from the preform. -
FIG. 8 hereinbelow is a perspective view of areaction chamber 700 according to the present invention into which three preforms (and associated induction heating coils) are loaded. This illustration is strictly by way of example to illustrate the densification of multiple porous parts, and other loading arrangements with other numbers of preforms are possible. - Overall, the multiple-part densification shows another way of producing carbon disks in at least a three-part densification configuration. In this arrangement, the liquid precursor is supplied to the
reaction chamber 700 throughports 710. The power from the power supply is transferred to the induction coils 730 by appropriately arranged (depending on the physical arrangements of a given densification facility) copper bus bars 760 with external water cooling networks. - As previously mentioned, the porous parts are secured and positioned in the center of the pancake coils 730 during densification. The Lepel power supply, for example, has remote PID loop control capability and can be monitored and controlled from a computer control terminal. Power density, voltage control, current control, and/or temperature control of the densification process by known methods is also within the scope of the contemplated arrangement.
- The liquid precursor is supplied to the reaction chamber(s) 700 from the local precursor storage tank. Preferably, sufficient liquid precursor is provided to substantially immerse the preform(s) being densified, as well as the induction heating coils associated therewith. The film boiling process creates gaseous species that in part causes the formation of pyrolitic carbon on interior surfaces of the preform porosity. Precursor vapor is released thru an
exhaust line 720 and vented to an external condenser (not shown) for possible recycling in the process. Effluent gas that is still left over is preferably conveyed to a thermal oxidizer (not shown). - In this example of a coil/
reactor chamber 700, loading and unloading of the porous preforms require, for example, bolting and unbolting a frontreactor cover panel 750 and correspondingexternal bus connection 760. Each reactor chamber 700 (as many as are provided) is connected with a common precursor supply line and acommon exhaust line 720 to the condenser and thermal oxidizer. Each reactor chamber can be filled, drained, and monitored from the computer control system. The exhaust vapor from the densification process is condensed and fed back to the reactors, whereas the residual effluent gas is then taken to the thermal oxidizer and burned. -
FIG. 9 illustrates another arrangement for the liquid densification of multiple porous parts. This illustration shows the densification of multipleporous parts 870 inside of a sealedreaction chamber 800. A load stack consisting of multipleporous parts 870 andgraphite plates 860 therebetween are pre-assembled. The load stack is placed on a ceramic or electrically insulatedstand 890 and thefurnace lid 805 is removed during the loading and unloading operation. The power from the power supply is transferred to themulti-zone coil power port 880. Individual PID zone control is made possible through power density, voltage control, current control, frequency control, and/or temperature control for the densification process. - The heating of the
porous parts 870 is accomplished by using, for example, amulti-zone induction coil graphite plates 860. Theannular graphite plates 860 have similar ID and OD dimensions as the annular porous parts and the thickness of the annular graphite plate ranges between 5 mm to 25 mm. - In this case the densification fronts start from the heated preform surfaces which are in contact with the
graphite plates 860. Liquid precursor is supplied to thereactor chamber 800 and the liquid can be filled and drained throughport 895. Aliquid level indicator 840 indicates the level of precursor fluid during the fill, drain, and densification. Sufficient liquid precursor is provided to substantially immerse the load stack inside of thereactor chamber cavity 806. A continuous feed of liquid precursor is also possible during the densification process. - As mentioned previously, the densification process creates gaseous species and the vapor is released from
port 850 and directed to the condenser for possible recycling purpose. Effluent gas that is not captured is conveyed to the thermal oxidizer to burn off the residual hydrocarbons. - It is thought that it might be useful to mount a preform with respect to corresponding coils such that the preform could be rotated about its center during densification, under influence of the heating coils. For example, a mounting assembly could be provided at the center of a given preform that could be appropriately connected to a driving device located outside of the respective reaction chamber. The rate of rotation of the preform might be from about one to about five revolutions per minute, as currently contemplated.
- It can be useful according to the contemplated system to provide the coils and/or the buses with a non-stick electrically insulating coating, such as epoxy or polytetrafluoroethylene to prevent electrical load faults or shorting caused by inadvertent contact between the preform and the coil and/or bus.
- While the present invention has been described with respect to what are believed to be the most practical embodiments thereof, it is particularly noted that this is by way of example only, and appropriate modifications and variations thereof are possible within the scope of the claims appended hereto.
Claims (27)
1. A method of manufacturing an inductive heating coil comprising machining or milling a metal plate having oppositely facing first and second sides to define a spiral metal inductive heating coil having oppositely facing first and second sides.
2. The method of claim 1 , wherein the metal plate is a copper plate.
3. The method of claim 1 , wherein machining or milling comprises computer-controlled machining or milling, respectively.
4. The method of claim 1 , further comprising fixing a metal water cooling tube to one side of the spiral metal heating coil structure so as to follow the spiral metal heating coil structure.
5. The method of claim 4 , wherein fixing the metal water cooling tube comprises brazing the metal water cooling tube to the spiral metal heating coil structure.
6. The method according to claim 4 , wherein the metal water cooling tube is rectangular in cross-section.
7. An inductive heating assembly comprising:
a support frame;
at least one pair of spiral induction heating coils mounted on the support frame and being aligned with one another in a generally parallel orientation, the pair of induction heating coils being spaced apart from each other by a coil separation distance; and
an electrical power supply electrically connected to the pair of induction heating coils;
wherein each spiral induction heating coil is fabricated from a machined or milled flat metal plate, the machining or milling defining a spiral form of the spiral induction heating coil.
8. The assembly according to claim 7 , wherein each spiral induction heating coil of the at least one pair of spiral induction heating coils is provided with a water cooling tube extending in a spiral orientation along the spiral form of the spiral induction heating coil.
9. The assembly according to claim 8 , wherein each water cooling tube is brazed to a respective spiral induction heating coil.
10. The assembly according to claim 7 , wherein each induction heating coil has a gap of at most about 0.75 inches between adjacent turns of induction heating coil.
11. The assembly according to claim 7 , wherein each induction heating coil has an outside diameter of about 25 inches.
12. The assembly according to claim 7 , wherein each induction heating coil has an inside diameter of about 3 inches.
13. The assembly according to claim 7 , wherein the support frame is made from a G-10 glass material.
14. The assembly according to claim 7 , wherein each heating induction coil is provided with one or more boltheads arranged to provide means for mounting the heating induction coil on the support frame.
15. The assembly according to claim 14 , wherein the means for mounting the heating induction coil is adjustable for adjusting a space between the at least one pair of induction heating coils.
16. The assembly according to claim 7 , wherein the support frame is provided with one or more supports for supporting a workpiece being heated by the at least one pair of heating induction coils between the respective heating induction coils at a periphery of the workpiece.
17. A method of densifying a porous article in an inductive heating apparatus, comprising:
mounting one or more porous articles in one or more corresponding inductive heating assemblies, each inductive heating assembly comprising:
a support frame;
at least one pair of spiral induction heating coils mounted on the support frame and being aligned with one another in a generally parallel orientation, the pair of induction heating coils being spaced apart from each other by a coil separation distance; and
an electrical power supply electrically connected to the pair of induction heating coils;
wherein each spiral induction heating coil is fabricated from a machined or milled flat metal plate, the machining or milling defining a spiral form of the spiral induction heating coil;
immersing the inductive heating assembly having the porous article mounted therein in a reaction chamber in a liquid densification precursor, such that the liquid precursor infiltrates a porosity of the porous article;
providing electrical power to the at least one pair of spiral induction heating coils to cause the porous article to be inductively heated to temperature to cause the liquid precursor to pyrolyze and leave a pyrolytic deposition product within the porosity of the porous article, thereby reducing the porosity of the porous article.
18. The method according to claim 17 , wherein the porous article has an initial bulk density before densification between about 0.2 to about 0.5 g/cc.
19. The method according to claim 17 , wherein the porous article has a final bulk density after densification between about 1.50 and about 1.90 g/cc±0.04 g/cc.
20. The method according to claim 17 , further comprising rotating the porous article about an axis perpendicular to the at least one pair of spiral induction heating coils.
21. The method according to claim 17 , wherein the liquid precursor is chosen from the group consisting of: cyclopentane, cyclohexene, 1-hexene, gasoline, toluene, methylcyclohexane, n-hexane, kerosene, hydrodesulfurized kerosene, and benzene, and combinations thereof.
22. The method according to claim 17 , wherein the porous article is inductively heated to a temperature of between about 900° C. and about 1500° C.
23. The method according to according to claim 17 , wherein the porous article is substantially round, and has a diameter no larger than a diameter of the pair of induction heating coils.
24. The method according to claim 17 , wherein a plurality of heating assemblies is provided.
25. The method according to claim 17 , wherein the electrical power supplies of the plurality of heating assemblies are connected to a common electrical bus.
26. The method according to claim 17 , further comprising a heat treatment step after the porous article is densified as desired, the heat treatment step comprising:
draining the precursor liquid completely from the reactor chamber,
heating the densified porous article to a temperature between about 1600° C. and about 2400° C. while applying a pressure between about 760 Torr and about 780 Torr, and
gradually ramping down the applied heating temperature to zero at the end of heat treatment.
27. The method according to claim 17 , comprising:
setting an initial frequency and power supply to the induction coils, the initial frequency and power supply being effective to accumulate sufficient heat at a geometric center region of the porous article to cause pyrolysis of liquid precursor vapor preferentially in the pores located in the geometric center region of the preform,
providing electrical power to the induction coil at the initial frequency sufficient to densify the geometric center region of the preform before substantially densifying other interior regions and an exterior surface of the porous article,
after densifying the geometric center region of the porous article, providing electrical power the induction coils at one or more frequency settings, the power level and frequency setting being effective to heat the interior of the porous article to cause pyrolysis of the liquid precursor vapor and preferentially deposit a pyrolytic product in the pores located adjacent to the geometric center region,
adjusting the power level supplied to the induction coils at one or more frequency settings, the quantity of power and frequency setting being effective to progressively densify the interior regions of the preform in a radial direction outwards from the geometric center region of the preform, and
gradually ramping down the power to zero at the end of the densification process.
Priority Applications (1)
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US12/376,391 US20100230402A1 (en) | 2006-08-07 | 2007-08-07 | Apparatus for porous material densification |
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US82159606P | 2006-08-07 | 2006-08-07 | |
US12/376,391 US20100230402A1 (en) | 2006-08-07 | 2007-08-07 | Apparatus for porous material densification |
PCT/EP2007/058195 WO2008017677A2 (en) | 2006-08-07 | 2007-08-07 | Apparatus for porous material densification |
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US20100230402A1 true US20100230402A1 (en) | 2010-09-16 |
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US12/376,396 Active 2029-07-29 US8568838B2 (en) | 2006-08-07 | 2007-08-07 | Power control for densification of one or more porous articles |
US12/376,391 Abandoned US20100230402A1 (en) | 2006-08-07 | 2007-08-07 | Apparatus for porous material densification |
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US12/376,396 Active 2029-07-29 US8568838B2 (en) | 2006-08-07 | 2007-08-07 | Power control for densification of one or more porous articles |
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US (3) | US20100297360A1 (en) |
EP (3) | EP2050311B1 (en) |
JP (3) | JP5357024B2 (en) |
KR (3) | KR101492648B1 (en) |
CN (5) | CN101522590A (en) |
BR (3) | BRPI0716038A2 (en) |
CA (3) | CA2660203A1 (en) |
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