GB2137975A - Joining of Silicon Carbide Bodies - Google Patents

Joining of Silicon Carbide Bodies Download PDF

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Publication number
GB2137975A
GB2137975A GB08408932A GB8408932A GB2137975A GB 2137975 A GB2137975 A GB 2137975A GB 08408932 A GB08408932 A GB 08408932A GB 8408932 A GB8408932 A GB 8408932A GB 2137975 A GB2137975 A GB 2137975A
Authority
GB
United Kingdom
Prior art keywords
silicon
carbon material
joined
silicon carbide
bodies
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB08408932A
Other versions
GB2137975B (en
GB8408932D0 (en
Inventor
Peter Kennedy
Kenneth Parkinson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UK Atomic Energy Authority
Original Assignee
UK Atomic Energy Authority
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB838309857A external-priority patent/GB8309857D0/en
Application filed by UK Atomic Energy Authority filed Critical UK Atomic Energy Authority
Priority to GB08408932A priority Critical patent/GB2137975B/en
Publication of GB8408932D0 publication Critical patent/GB8408932D0/en
Publication of GB2137975A publication Critical patent/GB2137975A/en
Application granted granted Critical
Publication of GB2137975B publication Critical patent/GB2137975B/en
Expired legal-status Critical Current

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Classifications

    • 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
    • C04B37/00—Joining burned ceramic articles with other burned ceramic articles or other articles by heating
    • C04B37/003—Joining burned ceramic articles with other burned ceramic articles or other articles by heating by means of an interlayer consisting of a combination of materials selected from glass, or ceramic material with metals, metal oxides or metal salts
    • C04B37/005—Joining burned ceramic articles with other burned ceramic articles or other articles by heating by means of an interlayer consisting of a combination of materials selected from glass, or ceramic material with metals, metal oxides or metal salts consisting of glass or ceramic material
    • 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
    • C04B35/573—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 by reaction sintering or recrystallisation
    • 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
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/02—Aspects relating to interlayers, e.g. used to join ceramic articles with other articles by heating
    • C04B2237/04—Ceramic interlayers
    • C04B2237/08—Non-oxidic interlayers
    • C04B2237/083—Carbide interlayers, e.g. silicon carbide interlayers
    • 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
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/02—Aspects relating to interlayers, e.g. used to join ceramic articles with other articles by heating
    • C04B2237/04—Ceramic interlayers
    • C04B2237/08—Non-oxidic interlayers
    • C04B2237/086—Carbon interlayers
    • 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
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/30—Composition of layers of ceramic laminates or of ceramic or metallic articles to be joined by heating, e.g. Si substrates
    • C04B2237/32—Ceramic
    • C04B2237/36—Non-oxidic
    • C04B2237/365—Silicon carbide
    • 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
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
    • C04B2237/60—Forming at the joining interface or in the joining layer specific reaction phases or zones, e.g. diffusion of reactive species from the interlayer to the substrate or from a substrate to the joining interface, carbide forming at the joining interface
    • 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
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
    • C04B2237/76—Forming laminates or joined articles comprising at least one member in the form other than a sheet or disc, e.g. two tubes or a tube and a sheet or disc
    • C04B2237/765—Forming laminates or joined articles comprising at least one member in the form other than a sheet or disc, e.g. two tubes or a tube and a sheet or disc at least one member being a tube

Abstract

Carbon material is sandwiched between two surfaces of reaction-bonded silicon carbide bodies and molten silicon is caused to flow between the surfaces and react with the carbon material to convert it to silicon carbide and bond the surfaces together. The carbon material may for example be colloidal graphite or graphite paper and may be mixed with silicon and/or silicon carbide powders. The molten silicon may be supplied from a paste including silicon powder which is applied to the bodies being joined so that it can flow between the surfaces to be bonded. The silicon in the paste may be protected from oxidation by a layer of carbon and/or glass.

Description

SPECIFICATION Joining Silicon Carbide Bodies This invention relates to the joining of silicon carbide bodies.
Reaction-bonded silicon carbide bodies are produced by reaction sintering of a coherent mixture (or green body) of carbon and silicon carbide powders in the presence of molten silicon whereby the carbon in the mixture is converted to bonding silicon carbide and a substantially continuous silicon carbide matrix is formed in a substantially continuous free silicon phase. The present invention seeks to provide a bond between two such reaction-bonded silicon carbide bodies.
According to the invention carbon material is sandwiched between surfaces of two reactionbonded silicon carbide bodies to be joined and molten silicon is caused to flow between the surfaces and react with the carbon material to convert it to silicon carbide and provide a bond between the surfaces.
During the reaction between the carbon material and the molten silicon swelling occurs and the carbon material may be so arranged (and the quantities and reactants selected) that any gap between the surfaces to be joined is filled by expansion of the carbon material on its conversion to silicon carbide and by the molten silicon. It is intended that the carbon material and the silicon carbide formed from it should provide capillary passages through which the molten silicon is drawn and the carbon material is selected accordingly, depending on the gap between the surfaces to be joined. This gap is sometimes only narrow by virtue of careful machining of the surfaces to be joined and with a gap of, say, 0.05 mm the surfaces may be coated with colloidal graphite.With slightly wider gaps graphite paper may be used as the carbon material and with still wider gaps carbon material may be mixed with silicon and/or silicon carbide powders to provide a filler for the joint.
The silicon needed to flow between the surfaces to be joined may be supplied from a local source by forming the silicon as powder into a paste with, say, an epoxy resin and disposing the paste on the bodies being joined where, on raising the temperature to melt the silicon, the molten silicon can flow between the surfaces to be joined and contact the carbon material sandwiched between these surfaces. Unless a vacuum or inert atmosphere is maintained about the parts being joined the silicon paste has to be protected from oxidation during heating to melt the silicon.
Accordingly a layer of carbon and/or a suitable glass may be provided over the outer surface of the paste when it is disposed on the bodies to be joined.
The silicon may contain alloying elements as disclosed in British Patent Specification No.
1,315,319 which help to wet the surfaces to be joined.
As an example of one way of carrying the invention into effect a spigot joint may be made between two tubes of reaction-bonded silicon carbide by wrapping graphite paper around the male spigot, inserting a graphite paper washer between abutting faces of the two tubes, or both, and firing the joint in contact with silicon by induction heating to 14000C at a high frequency of at least 400 Hertz.
1. The bonding of surfaces of two reactionbonded silicon carbide bodies by sandwiching carbon material between the surfaces to be joined and causing molten silicon to flow between the surfaces and react with the carbon material to convert it to silicon carbide.
2. The bonding of surfaces as claimed in Claim1 wherein the carbon material is colloidal graphite.
3. The bonding of surfaces as claimed in Claim 1 wherein the carbon material is graphite paper.
4. The bonding of surfaces as claimed in Claim 1 wherein the carbon material is mixed with silicon and/or silicon carbide powders.
5. The bonding of surfaces as claimed in Claim 1 wherein the molten silicon is supplied from a paste including silicon powder disposed on the bodies being joined where on melting the silicon can flow between the surfaces to be bonded.
6. The bonding of surfaces as claimed in Claim 5 wherein the silicon is protected from oxidation by a layer of carbon over the outer surface of the paste when it is disposed on the bodies being joined.
7. The bonding of surfaces as claimed in Claim 5 wherein the silicon is protected from oxidation by a layer of glass over the outer surface of the paste when it is disposed on the bodies being joined.
8. The bonding of surfaces as claimed in any preceding claim wherein the molten silicon contains alloying elements.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Joining Silicon Carbide Bodies This invention relates to the joining of silicon carbide bodies. Reaction-bonded silicon carbide bodies are produced by reaction sintering of a coherent mixture (or green body) of carbon and silicon carbide powders in the presence of molten silicon whereby the carbon in the mixture is converted to bonding silicon carbide and a substantially continuous silicon carbide matrix is formed in a substantially continuous free silicon phase. The present invention seeks to provide a bond between two such reaction-bonded silicon carbide bodies. According to the invention carbon material is sandwiched between surfaces of two reactionbonded silicon carbide bodies to be joined and molten silicon is caused to flow between the surfaces and react with the carbon material to convert it to silicon carbide and provide a bond between the surfaces. During the reaction between the carbon material and the molten silicon swelling occurs and the carbon material may be so arranged (and the quantities and reactants selected) that any gap between the surfaces to be joined is filled by expansion of the carbon material on its conversion to silicon carbide and by the molten silicon. It is intended that the carbon material and the silicon carbide formed from it should provide capillary passages through which the molten silicon is drawn and the carbon material is selected accordingly, depending on the gap between the surfaces to be joined. This gap is sometimes only narrow by virtue of careful machining of the surfaces to be joined and with a gap of, say, 0.05 mm the surfaces may be coated with colloidal graphite.With slightly wider gaps graphite paper may be used as the carbon material and with still wider gaps carbon material may be mixed with silicon and/or silicon carbide powders to provide a filler for the joint. The silicon needed to flow between the surfaces to be joined may be supplied from a local source by forming the silicon as powder into a paste with, say, an epoxy resin and disposing the paste on the bodies being joined where, on raising the temperature to melt the silicon, the molten silicon can flow between the surfaces to be joined and contact the carbon material sandwiched between these surfaces. Unless a vacuum or inert atmosphere is maintained about the parts being joined the silicon paste has to be protected from oxidation during heating to melt the silicon. Accordingly a layer of carbon and/or a suitable glass may be provided over the outer surface of the paste when it is disposed on the bodies to be joined. The silicon may contain alloying elements as disclosed in British Patent Specification No. 1,315,319 which help to wet the surfaces to be joined. As an example of one way of carrying the invention into effect a spigot joint may be made between two tubes of reaction-bonded silicon carbide by wrapping graphite paper around the male spigot, inserting a graphite paper washer between abutting faces of the two tubes, or both, and firing the joint in contact with silicon by induction heating to 14000C at a high frequency of at least 400 Hertz. CLAIMS
1. The bonding of surfaces of two reactionbonded silicon carbide bodies by sandwiching carbon material between the surfaces to be joined and causing molten silicon to flow between the surfaces and react with the carbon material to convert it to silicon carbide.
2. The bonding of surfaces as claimed in Claim1 wherein the carbon material is colloidal graphite.
3. The bonding of surfaces as claimed in Claim 1 wherein the carbon material is graphite paper.
4. The bonding of surfaces as claimed in Claim 1 wherein the carbon material is mixed with silicon and/or silicon carbide powders.
5. The bonding of surfaces as claimed in Claim 1 wherein the molten silicon is supplied from a paste including silicon powder disposed on the bodies being joined where on melting the silicon can flow between the surfaces to be bonded.
6. The bonding of surfaces as claimed in Claim 5 wherein the silicon is protected from oxidation by a layer of carbon over the outer surface of the paste when it is disposed on the bodies being joined.
7. The bonding of surfaces as claimed in Claim 5 wherein the silicon is protected from oxidation by a layer of glass over the outer surface of the paste when it is disposed on the bodies being joined.
8. The bonding of surfaces as claimed in any preceding claim wherein the molten silicon contains alloying elements.
GB08408932A 1983-04-12 1984-04-06 Joining silicon carbide bodies Expired GB2137975B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08408932A GB2137975B (en) 1983-04-12 1984-04-06 Joining silicon carbide bodies

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB838309857A GB8309857D0 (en) 1983-04-12 1983-04-12 Joining silicon carbide bodies
GB08408932A GB2137975B (en) 1983-04-12 1984-04-06 Joining silicon carbide bodies

Publications (3)

Publication Number Publication Date
GB8408932D0 GB8408932D0 (en) 1984-05-16
GB2137975A true GB2137975A (en) 1984-10-17
GB2137975B GB2137975B (en) 1986-09-17

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Family Applications (1)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0356800A1 (en) * 1988-08-15 1990-03-07 Shin-Etsu Chemical Co., Ltd. Silicon carbide ceramics bonding compositions
EP0357491A2 (en) * 1988-08-30 1990-03-07 Shin-Etsu Chemical Co., Ltd. Method for the preparation of an integrally conjoined sintered body of silicon carbide
US4921554A (en) * 1988-09-27 1990-05-01 Norton Company Joining of porous silicon carbide bodies
EP0388666A1 (en) * 1989-03-11 1990-09-26 Bayer Ag Graphite adhesive and process for producing bonded joints between graphite particles
WO1996013471A1 (en) * 1994-10-28 1996-05-09 Deutsche Forschungsanstalt für Luft- und Raumfahrt e.V. Friction element
EP0804991A1 (en) * 1996-05-03 1997-11-05 Cvd Incorporated Bonding of silicon carbide components
DE10035111A1 (en) * 2000-03-24 2001-10-31 Industrieanlagen Betriebsges Carbon, silicon and silicon carbide support used as a reflector for electromagnetic light, as a machine bed, or measuring bench consists of a support body formed from at least two segments
CN101077776B (en) * 2007-03-26 2010-12-08 武汉工程大学 Method for preparing silicon carbide products from expanded graphite or flexible graphite paper
US8337648B2 (en) * 2001-12-03 2012-12-25 F.M. Technologies, Inc. Ceramic joining
US20160023956A1 (en) * 2014-07-28 2016-01-28 The Curators Of The University Of Missouri Ceramic-ceramic welds

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116178019B (en) * 2022-09-08 2023-12-22 合肥工业大学 Method for preparing porous MAX phase ceramic material by pressureless wrapping calcination
CN116354738A (en) * 2022-11-24 2023-06-30 广东工业大学 Ceramic connecting piece with high temperature resistance and irradiation resistance, and preparation method and application thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1497871A (en) * 1974-01-21 1978-01-12 Carborundum Co Electrical igniter elements
GB1556881A (en) * 1976-02-23 1979-11-28 Gen Electric Method of making molten silicon infiltration reaction products and products made thereby
GB2081240A (en) * 1980-08-01 1982-02-17 Atomic Energy Authority Uk Silicon Carbide Bodies

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1497871A (en) * 1974-01-21 1978-01-12 Carborundum Co Electrical igniter elements
GB1556881A (en) * 1976-02-23 1979-11-28 Gen Electric Method of making molten silicon infiltration reaction products and products made thereby
GB2081240A (en) * 1980-08-01 1982-02-17 Atomic Energy Authority Uk Silicon Carbide Bodies

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0356800A1 (en) * 1988-08-15 1990-03-07 Shin-Etsu Chemical Co., Ltd. Silicon carbide ceramics bonding compositions
US4952533A (en) * 1988-08-15 1990-08-28 Shin-Etsu Chemical Co., Ltd. Silicon carbide ceramic bonding compositions
EP0357491A2 (en) * 1988-08-30 1990-03-07 Shin-Etsu Chemical Co., Ltd. Method for the preparation of an integrally conjoined sintered body of silicon carbide
EP0357491A3 (en) * 1988-08-30 1991-11-06 Shin-Etsu Chemical Co., Ltd. Method for the preparation of an integrally conjoined sintered body of silicon carbide
US4921554A (en) * 1988-09-27 1990-05-01 Norton Company Joining of porous silicon carbide bodies
EP0388666A1 (en) * 1989-03-11 1990-09-26 Bayer Ag Graphite adhesive and process for producing bonded joints between graphite particles
WO1996013471A1 (en) * 1994-10-28 1996-05-09 Deutsche Forschungsanstalt für Luft- und Raumfahrt e.V. Friction element
US6042935A (en) * 1994-10-28 2000-03-28 Deutsche Forschungsanstalt Fuer Luft-Ung Raumfahrt E.V. Friction element
EP0804991A1 (en) * 1996-05-03 1997-11-05 Cvd Incorporated Bonding of silicon carbide components
DE10035111A1 (en) * 2000-03-24 2001-10-31 Industrieanlagen Betriebsges Carbon, silicon and silicon carbide support used as a reflector for electromagnetic light, as a machine bed, or measuring bench consists of a support body formed from at least two segments
US8337648B2 (en) * 2001-12-03 2012-12-25 F.M. Technologies, Inc. Ceramic joining
CN101077776B (en) * 2007-03-26 2010-12-08 武汉工程大学 Method for preparing silicon carbide products from expanded graphite or flexible graphite paper
US20160023956A1 (en) * 2014-07-28 2016-01-28 The Curators Of The University Of Missouri Ceramic-ceramic welds

Also Published As

Publication number Publication date
GB2137975B (en) 1986-09-17
GB8408932D0 (en) 1984-05-16

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Legal Events

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732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee