CN102775176B - Preparation method of three-dimensional needling carbon/carborundum composite material bolt - Google Patents
Preparation method of three-dimensional needling carbon/carborundum composite material bolt Download PDFInfo
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- CN102775176B CN102775176B CN 201210249387 CN201210249387A CN102775176B CN 102775176 B CN102775176 B CN 102775176B CN 201210249387 CN201210249387 CN 201210249387 CN 201210249387 A CN201210249387 A CN 201210249387A CN 102775176 B CN102775176 B CN 102775176B
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 60
- 229910010271 silicon carbide Inorganic materials 0.000 title claims abstract description 60
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 239000002131 composite material Substances 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000011204 carbon fibre-reinforced silicon carbide Substances 0.000 claims abstract description 14
- 239000011248 coating agent Substances 0.000 claims abstract description 13
- 238000000576 coating method Methods 0.000 claims abstract description 13
- 239000000758 substrate Substances 0.000 claims abstract description 10
- 239000000835 fiber Substances 0.000 claims abstract description 9
- 238000000151 deposition Methods 0.000 claims description 93
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 55
- 239000007789 gas Substances 0.000 claims description 51
- 238000000034 method Methods 0.000 claims description 50
- DWAWYEUJUWLESO-UHFFFAOYSA-N trichloromethylsilane Chemical compound [SiH3]C(Cl)(Cl)Cl DWAWYEUJUWLESO-UHFFFAOYSA-N 0.000 claims description 33
- 238000011160 research Methods 0.000 claims description 27
- 239000004744 fabric Substances 0.000 claims description 25
- 239000011159 matrix material Substances 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 20
- 150000001875 compounds Chemical class 0.000 claims description 16
- 238000001467 acupuncture Methods 0.000 claims description 14
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 12
- 239000003575 carbonaceous material Substances 0.000 claims description 12
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 12
- 239000004917 carbon fiber Substances 0.000 claims description 11
- 230000008021 deposition Effects 0.000 claims description 10
- 239000012159 carrier gas Substances 0.000 claims description 8
- 238000010079 rubber tapping Methods 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 5
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 5
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 229910003460 diamond Inorganic materials 0.000 abstract description 6
- 239000010432 diamond Substances 0.000 abstract description 6
- 238000012360 testing method Methods 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 3
- 238000005299 abrasion Methods 0.000 abstract 2
- 238000000227 grinding Methods 0.000 abstract 2
- 238000003754 machining Methods 0.000 abstract 2
- 238000009417 prefabrication Methods 0.000 abstract 2
- 230000003064 anti-oxidating effect Effects 0.000 abstract 1
- 238000010923 batch production Methods 0.000 abstract 1
- 239000007795 chemical reaction product Substances 0.000 abstract 1
- 230000008595 infiltration Effects 0.000 abstract 1
- 238000001764 infiltration Methods 0.000 abstract 1
- 239000002296 pyrolytic carbon Substances 0.000 abstract 1
- 238000010008 shearing Methods 0.000 description 11
- 238000012545 processing Methods 0.000 description 6
- 230000006378 damage Effects 0.000 description 4
- 150000001722 carbon compounds Chemical class 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229920000784 Nomex Polymers 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 238000002679 ablation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- HPNSNYBUADCFDR-UHFFFAOYSA-N chromafenozide Chemical compound CC1=CC(C)=CC(C(=O)N(NC(=O)C=2C(=C3CCCOC3=CC=2)C)C(C)(C)C)=C1 HPNSNYBUADCFDR-UHFFFAOYSA-N 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000004763 nomex Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920003257 polycarbosilane Polymers 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
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Abstract
A preparation method of a three-dimensional needling carbon/carborundum composite material bolt adopts a three-dimensional needling fiber prefabrication body to prepare the composite material bolt. Pyrolytic carbon is deposited on the prefabrication body, carborundum substrates are deposited through chemical vapor infiltration (CVI), and a bolt bar blank and a bolt cap blank are obtained. The carborundum substrates of the bolt bar blank and the bolt cap blank which are obtained through machining are deposited through the CVI, a carborundum anti-oxidation coating is deposited through the CVI, and a three-dimensional needling C/SiC composite material bolt end product with the shear strength being 80-100MP is obtained. Compared with the prior art, the preparation method has the advantages that the number of times for getting into a furnace is reduced by 6-10, the densifying period is shorter, and the production cost is reduced. By means of a test of a CK6180-3000 numerically controlled lathe, the preparation method is small in diamond grinding wheel abrasion, hour norm for machining 30 bolt threads is reduced by about 10 hours, and as the abrasion of a grinding wheel is less, the working accuracy is improved, and industrialized batch production is achieved.
Description
Technical field
The present invention relates to ceramic matric composite preparation and processing technique field, the specifically preparation technology of a kind of three-dimensional needled carbon/composite material of silicon carbide bolt.
Background technology
The aerospacecraft flight environment of vehicle is very severe, and nose cone, the leading edge of a wing and fuselage flap surface top temperature can reach 1650 ℃, and this possesses excellent hot physical and chemical performance and mechanical property with regard to the bolt and nut that requires to connect for the thermal protection system structural part.
Space flight has graphite, carbon/carbon compound material and carbon/composite material of silicon carbide with the standard bolt nut material.That graphite has is high temperature resistant, low density and the series of advantages such as wear resistance is good, and that carbon/carbon compound material has is high temperature resistant, low density, wear-resistingly undermine highly than the series of advantages such as strong, but both have the poor shortcoming of high-temperature oxidation resistance simultaneously.And carbon/composite material of silicon carbide is high temperature resistant except possessing, low density, high than the series of advantages such as strong, also there is high-temperature oxidation resistance, anti-ablation and insensitive to crackle that graphite and carbon/carbon compound material do not possess, the excellent properties such as calamitous damage do not occur, and can adapt to well the service requirements of spationautics to the ultrahigh-temperature part.
A kind of preparation method of ceramic base compound material bolt is disclosed in the innovation and creation that are CN101265935 at publication number.In these innovation and creation, adopt chemical Vapor deposition process (hereinafter to be referred as CVI) to prepare the method for 2D C/SiC compound material bolt in conjunction with precursor method of impregnation (hereinafter to be referred as PIP) technique, the method first with carbon fiber carry out 0/90 ° just spreading and ± 45 ° tiltedly be paved into carbon fabric perform, then deposit RESEARCH OF PYROCARBON on precast body, reusable heat gradient CVI technique deposits SiC on fiber preform, form the work in-process matrix material, then use the diamond-impregnated wheel tapping, again by the PIP method to the work in-process bolt cracking Polycarbosilane that repeatedly infiltrates, finally by the CVI method, deposit the SiC inoxidzable coating on the work in-process bolt, obtain the finished product compound material bolt.The room temperature tensile breaking tenacity of 2D C/SiC compound material bolt prepared by the method is about 210～230MP, and the room temperature shearing resistance is about 70～80MP.Two-dimentional carbon cloth price high (approximately 8000 yuan/kilogram) because the method adopts, be difficult to industrialized mass production.Simultaneously, during the standby C/SiC matrix material of PIP legal system, not only preparation cycle is long, and pyroprocessing easy damaged fiber affects the performance of matrix material repeatedly, and the polymkeric substance cost is higher in addition, causes production cost higher, and finally affects the industrial applications of PIP technique.
Summary of the invention
Long because of the production cycle in order to overcome existing 2D C/SiC compound material bolt technology of preparing, high and mechanical property bolt of cost is low etc., and shortcoming causes it to be difficult to the present situation of industrialized mass production, the invention provides the preparation technology of a kind of three-dimensional needled carbon/composite material of silicon carbide bolt, adopt price approximately the three-dimensional Nomex of 800 yuan/kilogram as precast body, utilization deposits the RESEARCH OF PYROCARBON interfacial layer on precast body, the room temperature tensile breaking tenacity that adopts CVI technique to prepare three-dimensional needled carbon/composite material of silicon carbide bolt is about 180～200MP, shearing resistance is about 80～100MP, improved the shearing resistance of bolt on original preparation method, reduce preparation cost, and realize C/SiC compound material bolt industrialized mass production.
The technical solution adopted for the present invention to solve the technical problems: the preparation technology of a kind of three-dimensional needled carbon/composite material of silicon carbide bolt is characterized in that comprising the steps:
Step 2, deposition RESEARCH OF PYROCARBON interfacial layer.Deposit the RESEARCH OF PYROCARBON interfacial layer on three-dimensional needled carbon felt by cvd furnace, its processing condition are: depositing temperature is 800～1000 ℃, and being evacuated to pressure is 0.2～0.4kPa, and the propylene flow is 25～35ml/min, Ar airshed 250～350ml/min, depositing time 40～60h; Obtain depositing the tabular three-dimensional needled carbon felt of RESEARCH OF PYROCARBON interfacial layer.
Step 3, the depositing silicon carbide matrix.Depositing depositing silicon carbide matrix on the tabular three-dimensional needled carbon felt of RESEARCH OF PYROCARBON interfacial layer by cvd furnace, processing condition are: 800～1000 ℃ of depositing temperatures are evacuated to pressure 2～4kPa, H
2airshed 150～250ml/min, Ar airshed 250～350ml/min, 25～35 ℃ of trichloromethyl silane temperature, H
2be 8～12 with the molar mass ratio of trichloromethyl silane, depositing time 60～80h, form density and be about 1.15～1.20g/cm
3the work in-process composite board.
Step 5, the depositing silicon carbide matrix.Depositing silicon carbide matrix on shank of bolt and nuts blank, its processing condition are: 800～1000 ℃ of depositing temperatures, pressure 2～4kPa, H
2airshed 150～250ml/min, Ar airshed 250～350ml/min, 25～35 ℃ of trichloromethyl silane temperature, H
2be 8～12 with the molar mass ratio of trichloromethyl silane, depositing time 70～100h, make shank of bolt and nuts density be about 1.55～1.65g/cm
3.
Step 6, make work in-process.Utilize diamond wheel to shank of bolt and nuts tapping, subsequently both are assembled together, form the work in-process bolt.Processing parameter is: machine spindle speed is 70n/min, and depth of cut is 0.03～0.05mm, and speed of feed is 0.10～0.15mm/min.
Step 7, the depositing silicon carbide inoxidzable coating.Utilize the work in-process bolt depositing silicon carbide inoxidzable coating of CVI method to obtaining, depositing temperature is 800～1000 ℃, and gas is trichloromethyl silane, and depositing time is 70～100h, obtains three-dimensional acupuncture C/SiC compound material bolt finished product.
The invention has the beneficial effects as follows: adopt the lower three-dimensional acupuncture fiber preform of cost to prepare compound material bolt, first on precast body, deposit RESEARCH OF PYROCARBON, then utilize CVI depositing silicon carbide matrix, do not cutting shank of bolt and nuts on the work in-process composite preform of deposition compact fully, to shank of bolt and nuts CVI depositing silicon carbide matrix, make the density of deposited shank of bolt and nuts reach 1.55～1.65g/cm subsequently
3in time, assembled both, forms the work in-process bolt, finally to work in-process bolt CVI depositing silicon carbide inoxidzable coating.Compared with the existing technology, the present invention advances the heat number and has reduced approximately 6～10 times, the densification cycle is shorter, reduced production cost, by the test of CK 6180-3000 digital controlled lathe, show, the present invention is less to wear of diamond wheel, and the task time of processing 30 bolt threads reduces approximately 10 hours, and improved working accuracy, realized industrialized mass production.And the shearing resistance of the bolt obtained has been brought up to 80～100MP.
The accompanying drawing explanation
Fig. 1 is the structural representation of three-dimensional needled carbon felt;
Fig. 2 is the photo of the ceramic base compound material bolt for preparing of the present invention.
Fig. 3 is the Photomicrograph of bolt thread tooth in Fig. 2.
Fig. 4 is ridge fracture stereoscan photograph.
Fig. 5 is the load displacement curve figure in the bolt shearing performance test.
Fig. 6 is the preparation method's of three-dimensional needled carbon/composite material of silicon carbide bolt schema.
Embodiment
Embodiment 1:
The present embodiment is the preparation method of a kind of three-dimensional needled carbon/composite material of silicon carbide bolt, and its detailed process is:
Step 2, deposition RESEARCH OF PYROCARBON interfacial layer.Deposit the RESEARCH OF PYROCARBON interfacial layer on three-dimensional needled carbon felt by cvd furnace; depositing temperature is 800 ℃, and cvd furnace is evacuated to 0.2kPa, and the propylene gas that the flow of usining is 30ml/min is as deposition gases; the Ar gas of 250ml/min is as shielding gas, and depositing time is 60h.Obtain depositing the tabular three-dimensional needled carbon felt of RESEARCH OF PYROCARBON interfacial layer.
Step 3, the depositing silicon carbide matrix.Depositing depositing silicon carbide matrix on the tabular three-dimensional needled carbon felt of RESEARCH OF PYROCARBON interfacial layer by cvd furnace, depositing temperature is 800 ℃, and cvd furnace is evacuated to 2kPa, and the Ar gas that the flow of usining is 250ml/min is as shielding gas, the H that flow is 150ml/min
2gas, as carrier gas, passes through H
2gas is written into trichloromethyl silane in cvd furnace and reacts with the three-dimensional needled carbon felt that deposits the RESEARCH OF PYROCARBON interfacial layer, generates silicon carbide substrate, and is deposited on described three-dimensional needled carbon felt, forms density and is about 1.15～1.20g/cm
3the work in-process composite board.The temperature of described trichloromethyl silane is 30 ℃, H
2with the molar mass ratio of trichloromethyl silane be 10, depositing time is 70h.
Step 5, the depositing silicon carbide matrix.By cvd furnace depositing silicon carbide matrix on shank of bolt blank and nuts blank, depositing temperature is 800 ℃, and cvd furnace is evacuated to 4kPa, and the Ar gas that the flow of usining is 250ml/min is as shielding gas, the H that flow is 150ml/min
2gas, as carrier gas, passes through H
2gas is written into trichloromethyl silane in cvd furnace and reacts with shank of bolt and nuts blank, generates silicon carbide substrate, and is deposited on described shank of bolt and nuts blank, and obtaining density is 1.55～1.65g/cm
3shank of bolt blank and nuts blank.The temperature of described trichloromethyl silane is 30 ℃, H
2with the molar mass ratio of trichloromethyl silane be 12, depositing time is 70h.
Step 6, make work in-process.Utilize diamond wheel to shank of bolt blank and the tapping of nuts blank, machine spindle speed is 70n/min, and depth of cut is 0.03mm, and speed of feed is 0.15mm/min.Subsequently both are assembled together, form the work in-process bolt;
Step 7, the depositing silicon carbide inoxidzable coating.Utilize the work in-process bolt depositing silicon carbide inoxidzable coating of CVI method to obtaining.Depositing temperature is 800 ℃, and gas is trichloromethyl silane, and depositing time is 70h, obtains three-dimensional acupuncture C/SiC compound material bolt finished product.
The three-dimensional acupuncture C/SiC compound material bolt that this example is prepared, through mechanical properties and shearing resistance test, de-tooth phenomenon does not occur in the ridge of bolt, but screw rod fracture destruction, the tensile strength of bolt is 185MP, shearing resistance is 100MP.
Embodiment 2:
The present embodiment is the preparation method of a kind of three-dimensional needled carbon/composite material of silicon carbide bolt, and its detailed process is:
Step 2, deposition RESEARCH OF PYROCARBON interfacial layer.Deposit the RESEARCH OF PYROCARBON interfacial layer on three-dimensional needled carbon felt by cvd furnace; depositing temperature is 900 ℃, and cvd furnace is evacuated to 0.3kPa, and the propylene gas that the flow of usining is 25ml/min is as deposition gases; the Ar gas of 300ml/min is as shielding gas, and depositing time is 50h.Obtain depositing the tabular three-dimensional needled carbon felt of RESEARCH OF PYROCARBON interfacial layer.
Step 3, the depositing silicon carbide matrix.Depositing depositing silicon carbide matrix on the tabular three-dimensional needled carbon felt of RESEARCH OF PYROCARBON interfacial layer by cvd furnace, depositing temperature is 900 ℃, and cvd furnace is evacuated to 4kPa, and the Ar gas that the flow of usining is 300ml/min is as shielding gas, the H that flow is 200ml/min
2gas, as carrier gas, passes through H
2gas is written into trichloromethyl silane in cvd furnace and reacts with the three-dimensional needled carbon felt that deposits the RESEARCH OF PYROCARBON interfacial layer, generates silicon carbide substrate, and is deposited on described three-dimensional needled carbon felt, forms density and is about 1.15～1.20g/cm
3the work in-process composite board.The temperature of described trichloromethyl silane is 25 ℃, H
2with the molar mass ratio of trichloromethyl silane be 8, depositing time is 60h.
Step 5, the depositing silicon carbide matrix.By cvd furnace depositing silicon carbide matrix on shank of bolt blank and nuts blank, depositing temperature is 900 ℃, and cvd furnace is evacuated to 3kPa, and the Ar gas that the flow of usining is 300ml/min is as shielding gas, the H that flow is 200ml/min
2gas, as carrier gas, passes through H
2gas is written into trichloromethyl silane in cvd furnace and reacts with shank of bolt and nuts blank, generates silicon carbide substrate, and is deposited on described shank of bolt and nuts blank, and obtaining density is 1.55～1.65g/cm
3shank of bolt blank and nuts blank.The temperature of described trichloromethyl silane is 25 ℃, H
2with the molar mass ratio of trichloromethyl silane be 10, depositing time is 100h.
Step 6, make work in-process.Utilize diamond wheel to shank of bolt blank and the tapping of nuts blank, machine spindle speed is 70n/min, and depth of cut is 0.04mm, and speed of feed is 0.12mm/min.Subsequently both are assembled together, form the work in-process bolt;
Step 7, the depositing silicon carbide inoxidzable coating.Utilize the CVI method to work in-process bolt depositing silicon carbide inoxidzable coating, depositing temperature is 900 ℃, and gas is trichloromethyl silane, and depositing time is 80h, obtains three-dimensional acupuncture C/SiC compound material bolt finished product.
The three-dimensional acupuncture C/SiC compound material bolt that this example is prepared, through mechanical properties and shearing resistance test, de-tooth phenomenon does not occur in the ridge of bolt, but screw rod fracture destruction, the tensile strength of bolt is 190MP, shearing resistance is 90MP.
Embodiment 3:
The present embodiment is the preparation method of a kind of three-dimensional needled carbon/composite material of silicon carbide bolt, and its detailed process is:
Step 2, deposition RESEARCH OF PYROCARBON interfacial layer.Deposit the RESEARCH OF PYROCARBON interfacial layer on three-dimensional needled carbon felt by cvd furnace; depositing temperature is 1000 ℃, and cvd furnace is evacuated to 0.4kPa, and the propylene gas that the flow of usining is 35ml/min is as deposition gases; the Ar gas of 350ml/min is as shielding gas, and depositing time is 40h.Obtain depositing the tabular three-dimensional needled carbon felt of RESEARCH OF PYROCARBON interfacial layer.
Step 3, the depositing silicon carbide matrix.Depositing depositing silicon carbide matrix on the tabular three-dimensional needled carbon felt of RESEARCH OF PYROCARBON interfacial layer by cvd furnace, depositing temperature is 1000 ℃, and cvd furnace is evacuated to 3kPa, and the Ar gas that the flow of usining is 350ml/min is as shielding gas, the H that flow is 250ml/min
2gas, as carrier gas, passes through H
2gas is written into trichloromethyl silane in cvd furnace and reacts with the three-dimensional needled carbon felt that deposits the RESEARCH OF PYROCARBON interfacial layer, generates silicon carbide substrate, and is deposited on described three-dimensional needled carbon felt, forms density and is about 1.15～1.20g/cm
3the work in-process composite board.The temperature of described trichloromethyl silane is 35 ℃, H
2with the molar mass ratio of trichloromethyl silane be 12, depositing time is 80h.
Step 5, the depositing silicon carbide matrix.By cvd furnace depositing silicon carbide matrix on shank of bolt blank and nuts blank, depositing temperature is 1000 ℃, and cvd furnace is evacuated to 2kPa, and the Ar gas that the flow of usining is 350ml/min is as shielding gas, the H that flow is 250ml/min
2gas, as carrier gas, passes through H
2gas is written into trichloromethyl silane in cvd furnace and reacts with shank of bolt and nuts blank, generates silicon carbide substrate, and is deposited on described shank of bolt and nuts blank, and obtaining density is 1.55～1.65g/cm
3shank of bolt blank and nuts blank.The temperature of described trichloromethyl silane is 35 ℃, H
2with the molar mass ratio of trichloromethyl silane be 8, depositing time is 90h.
Step 6, make work in-process.Utilize diamond wheel to shank of bolt blank and the tapping of nuts blank, machine spindle speed is 70n/min, and depth of cut is 0.05mm, and speed of feed is 0.10mm/min.Subsequently both are assembled together, form the work in-process bolt;
Step 7, the depositing silicon carbide inoxidzable coating.Utilize the CVI method to work in-process bolt depositing silicon carbide inoxidzable coating, depositing temperature is 1000 ℃, and gas is trichloromethyl silane, and depositing time is 100h, obtains three-dimensional acupuncture C/SiC compound material bolt finished product.
The three-dimensional acupuncture C/SiC compound material bolt that this example is prepared, through mechanical properties and shearing resistance test, de-tooth phenomenon does not occur in the ridge of bolt, but screw rod fracture destruction, the tensile strength of bolt is 185MP, shearing resistance is 100MP.
Claims (1)
1. the preparation method of three-dimensional needled carbon/composite material of silicon carbide bolt, is characterized in that, detailed process is:
Step 1, make three-dimensional needled carbon felt precast body; Make the tire net with the T700 carbon fiber of 12K; By 0 ° of individual layer without 90 ° of latitude cloth, individual layer tire net, individual layer without the stack that circulates successively of latitude cloth and individual layer tire net, until laying is to design thickness; Adopt the mode of relay-type acupuncture that the fiber in the tire net is vertically penetrated into without between latitude cloth, make tabular three dimensional needle thorn carbon felt precast body; Described carbon fiber volume fraction is 35%, and density is 0.6g/cm
3;
Step 2, deposition RESEARCH OF PYROCARBON interfacial layer; Deposit the RESEARCH OF PYROCARBON interfacial layer on three-dimensional needled carbon felt by cvd furnace, depositing temperature is 800 ℃～1000 ℃, cvd furnace is evacuated to 0.2～0.4kPa, the propylene gas that the flow of usining is 25ml/min～35ml/min is as deposition gases, the Ar gas of 250ml/min～350ml/min is as shielding gas, and depositing time is 40h～60h; Obtain depositing the tabular three-dimensional needled carbon felt of RESEARCH OF PYROCARBON interfacial layer;
Step 3, the depositing silicon carbide matrix; Depositing depositing silicon carbide matrix on the tabular three-dimensional needled carbon felt of RESEARCH OF PYROCARBON interfacial layer by cvd furnace; depositing temperature is 800～1000 ℃; cvd furnace is evacuated to 2kPa～4kPa; the Ar gas that the flow of usining is 250ml/min～350ml/min is as shielding gas, the H that flow is 150ml/min～250ml/min
2gas, as carrier gas, is written into trichloromethyl silane in cvd furnace and reacts with the three-dimensional needled carbon felt that deposits the RESEARCH OF PYROCARBON interfacial layer, generates silicon carbide substrate, and is deposited on described three-dimensional needled carbon felt, and formation density is 1.15～1.20g/cm
3the work in-process composite board; The temperature of described trichloromethyl silane is 25 ℃～35 ℃, H
2with the molar mass ratio of trichloromethyl silane be 8～12, depositing time is 60～80h;
Step 4, the converted products blank; On the work in-process composite board, the mode by cutting processes shank of bolt blank and nuts blank respectively;
Step 5, the depositing silicon carbide matrix; By cvd furnace depositing silicon carbide matrix on shank of bolt blank and nuts blank; depositing temperature is 800～1000 ℃; cvd furnace is evacuated to 2kPa～4kPa, and the Ar gas that the flow of usining is 250～350ml/min is as shielding gas, the H that flow is 150～250ml/min
2gas, as carrier gas, is written into trichloromethyl silane in cvd furnace and reacts with shank of bolt and nuts blank, generates silicon carbide substrate, and is deposited on described shank of bolt and nuts blank, and obtaining density is 1.55～1.65g/cm
3shank of bolt blank and nuts blank; The temperature of described trichloromethyl silane is 25 ℃～35 ℃, H
2with the molar mass ratio of trichloromethyl silane be 8～12, depositing time is 70～100h;
Step 6, make work in-process; To shank of bolt blank and the tapping of nuts blank, machine spindle speed is 70n/min, and depth of cut is 0.03～0.05mm, and speed of feed is 0.10mm/min～0.15mm/min; Both are assembled together, form the work in-process bolt;
Step 7, the depositing silicon carbide inoxidzable coating; Utilize the work in-process bolt depositing silicon carbide inoxidzable coating of CVI method to obtaining; Depositing temperature is 800～1000 ℃, and gas is trichloromethyl silane, and depositing time is 70～100h, obtains three-dimensional acupuncture C/SiC compound material bolt finished product.
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| CN103557221A (en) * | 2013-10-11 | 2014-02-05 | 航天特种材料及工艺技术研究所 | Online connection preparation method for C/SiC materials |
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Address after: No. 912, West Section of Biyuan 1st Road, High-tech Zone, Xi'an City, Shaanxi Province 710061 Patentee after: Xi'an Xinyao Ceramic Composite Co.,Ltd. Address before: 710089 No.2 Lantian Road, Yanliang District, Xi'an City, Shaanxi Province Patentee before: XI'AN GOLDEN MOUNTAIN CERAMIC COMPOSITES CO.,LTD. |