CN102424597B - Preparation method of C/C-SIC ceramic composite material - Google Patents
Preparation method of C/C-SIC ceramic composite material Download PDFInfo
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- CN102424597B CN102424597B CN 201110287485 CN201110287485A CN102424597B CN 102424597 B CN102424597 B CN 102424597B CN 201110287485 CN201110287485 CN 201110287485 CN 201110287485 A CN201110287485 A CN 201110287485A CN 102424597 B CN102424597 B CN 102424597B
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- 239000002131 composite material Substances 0.000 title claims abstract description 35
- 239000000919 ceramic Substances 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 31
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 67
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 67
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 19
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims abstract description 16
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000002002 slurry Substances 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 239000000758 substrate Substances 0.000 claims abstract description 6
- 239000010703 silicon Substances 0.000 claims abstract description 4
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 4
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 47
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 22
- 239000000843 powder Substances 0.000 claims description 14
- 239000011248 coating agent Substances 0.000 claims description 13
- 238000000576 coating method Methods 0.000 claims description 13
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 12
- 229920003987 resole Polymers 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 11
- 239000000377 silicon dioxide Substances 0.000 claims description 11
- 235000013312 flour Nutrition 0.000 claims description 8
- 238000005245 sintering Methods 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000000151 deposition Methods 0.000 claims description 6
- 238000007598 dipping method Methods 0.000 claims description 6
- 239000011261 inert gas Substances 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 4
- 238000005728 strengthening Methods 0.000 claims description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 3
- 238000010000 carbonizing Methods 0.000 claims description 3
- 239000003518 caustics Substances 0.000 claims description 3
- 239000003085 diluting agent Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 3
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 3
- 238000006424 Flood reaction Methods 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims description 2
- 229920000049 Carbon (fiber) Polymers 0.000 abstract description 5
- 239000004917 carbon fiber Substances 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 abstract description 5
- 238000010923 batch production Methods 0.000 abstract description 4
- 239000005011 phenolic resin Substances 0.000 abstract description 4
- 239000011241 protective layer Substances 0.000 abstract description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 abstract description 2
- 238000003763 carbonization Methods 0.000 abstract description 2
- 238000005229 chemical vapour deposition Methods 0.000 abstract description 2
- 229920001568 phenolic resin Polymers 0.000 abstract description 2
- 238000007711 solidification Methods 0.000 abstract description 2
- 230000008023 solidification Effects 0.000 abstract description 2
- 239000002243 precursor Substances 0.000 abstract 2
- 238000003825 pressing Methods 0.000 abstract 2
- 238000005475 siliconizing Methods 0.000 abstract 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 12
- 239000000463 material Substances 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 9
- 239000011159 matrix material Substances 0.000 description 8
- 239000000835 fiber Substances 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 229910010293 ceramic material Inorganic materials 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 3
- 238000000498 ball milling Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229960004756 ethanol Drugs 0.000 description 3
- 230000008595 infiltration Effects 0.000 description 3
- 238000001764 infiltration Methods 0.000 description 3
- 238000013001 point bending Methods 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229960000935 dehydrated alcohol Drugs 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011226 reinforced ceramic Substances 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 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
- 238000000748 compression moulding Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920003257 polycarbosilane Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- DWAWYEUJUWLESO-UHFFFAOYSA-N trichloromethylsilane Chemical compound [SiH3]C(Cl)(Cl)Cl DWAWYEUJUWLESO-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a preparation method of a C/C-SIC ceramic composite material, comprising the following steps: using a cheap low-density PAN-based flat carbon felt as a precursor, and preparing a protective layer on the surface of carbon fibers through chemical vapor deposition; preparing phenolic resin, acetone, ethanol and silicon carbide powder in proportion into a slurry, immersing the carbon felt with the protective layer in the slurry and vacuumizing, then pressing for impregnating; pressing the pre-impregnated carbon felt into shape, then carrying out solidification and carbonization; then putting the carbonized precursor in a furnace, carrying out high temperature siliconizing reaction and filling to obtain a compact base substrate, and then removing residual silicon from the surface to obtain the high-performance high-density C/C-SIC ceramic composite material having a density of 2.30-2.70 g/cm<3>. According to the invention, the preparation process is simple, the raw materials are cheap, the production time and procedures are greatly reduced. The invention can be suitable for batch production and is easy to industrialization.
Description
Technical field
The present invention relates to high-temperature structural ceramics based composites technical field, be specifically related to a kind of preparation method that the heat resistant and wear resistants such as heating-furnace bottom lining plate, Electric conductive slider material and high conductive wear resistant material decrease low-cost carbon/carbon-silicon carbide (C/C-SiC) ceramic composite of material that is applicable to.
Background technology
Silicon carbide ceramics has good hot strength, high-temperature stability, high-temperature oxidation resistance and conductivity, but because the covalent linkage of its molecular structure is strong, causes the fragility of silicon carbide ceramics large, has had a strong impact on its application as structured material.Carbon fiber has good mechanical behavior under high temperature and thermal stability, surpasses 2000 ℃ and still can keep mechanical property not reduce in inert environments.Continuous fibre strengthens the antioxidant property that composite silicon carbide ceramic material not only combines high-temperature behavior and the silicon carbide ceramics excellence of carbon fiber excellence, and take full advantage of the fiber bridge joint and fiber is extracted toughening effect, the toughness of matrix material is increased substantially, be widely applied in high temperature heat structure field.Continuous Fiber Reinforced Ceramic Matrix Composites is having broad application prospects aspect the high temperature heat structure with its lightweight, high strength and high tenacity.Compare other ceramic matric composite (Al
2O
3Base and Si
3N
4Base), SiC based composite ceramic material intensity is high, oxidation-resistance is better.
At present, prepare continuous fibre enhancing composite silicon carbide ceramic material both at home and abroad and generally adopt chemical vapor infiltration (CVI) and polymeric preceramic body infiltration pyrolysis method (PIP), its major advantage is to be suitable for any complicated shape goods, and can realize batch production.But the shortcoming of these two kinds of technique maximums is preparation cycle long (more than 3 months), causes cost high, and the through engineering approaches that seriously restricts the C/C-SiC matrix material is used; And the preparation process required equipment is complicated, therefore, and the low-cost technology of preparing of domestic and international Devoting Major Efforts To Developing C/C-SiC matrix material.In addition, it is low that existing continuous fibre strengthens the composite silicon carbide ceramic material density, and the fragility of pottery is large, is easy to breakage.
Summary of the invention
The present invention is directed to the above-mentioned deficiency of prior art, provide that a kind of preparation cost is cheap, density is high, fragility is low, not cracky, technique is simple, preparation cycle is short carbon/carbon-silicon carbide ceramic composite.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: the preparation method of a kind of carbon/carbon-silicon carbide ceramic composite: preparation process comprises:
(1) with the PAN(polyacrylonitrile) basic dull and stereotyped carbon felt is as strengthening body, employing isothermal CVD(chemical vapour deposition) technique prepares carbon coating, take propylene as the RESEARCH OF PYROCARBON source of the gas, nitrogen is diluent gas, depositing temperature is 800 ~ 1200 ℃, depositing time is 10 ~ 150min, obtains the dull and stereotyped carbon felt of PAN base that the surface has carbon coating;
(2) select and add acetone, methyl alcohol or ethanol in the resol, weight ratio is that 3 ~ 18:1:1(is resol: acetone: methyl alcohol or ethanol=(3:1:1) ~ (9:0.5:0.5)), add silicon carbide micro-powder mixing manufacture form slurry, wherein resol and silicon carbide micro-powder weight ratio are that 1 ~ 27:3(is resol again: silicon carbide micro-powder=(1:3) ~ (9:1));
(3) the carbon felt with step (1) gained immerses in the slurry of step (2) gained, then putting into the vacuum pressure tank floods, vacuum tightness in the vacuum pressure tank is-0.08 ~-0.10Mpa, pressure are 0.1 ~ 3.0MPa, the dwell time is that 15 ~ 240min obtains prefabricated carbon felt;
(4) with preimpregnation carbon felt compacting under the pressure of 0.1 ~ 20MPa (compacting meeting extruding part resin) of step (3) gained;
(5) be that 100 ~ 200 ℃, soaking time are to solidify under 2 ~ 20 hours the condition with the preimpregnation carbon felt of the compacting of step (4) gained in temperature;
(6) the carbon felt after step (5) is solidified is heated to 800 ~ 1200 ℃ with 80 ~ 100 ℃/hour temperature rise rates in vacuum or inert gas environment, and insulation 30 ~ 240min carries out carbonizing treatment, obtains carbon/carbon porous preform;
(7) precast body with step (6) gained is placed in the silica flour, precast body and silica flour weight ratio are that 1:0.9 ~ 1.3(is precast body and silica flour weight ratio=(1:0.9) ~ (1:1.3)), under vacuum or protection of inert gas, be heated to 1450 ~ 1800 ℃ with 200 ~ 300 ℃/hour temperature rise rates, insulation 30 ~ 240min finishes sintering;
(8) base substrate behind step (7) sintering being put into temperature is that 350 ~ 550 ℃ molten caustic(soda) is processed, and the treatment time is 10 ~ 90min, removes the product surface residual silicon, namely obtains carbon of the present invention/carbon-silicon carbide ceramic composite.
PAN(polyacrylonitrile in the above-mentioned steps of the present invention (1)) basic dull and stereotyped carbon felt is that density is 0.05 ~ 0.50 gram per centimeter
3Commercially available conventional products.
The carbon coating thickness that the middle surface of above-mentioned steps of the present invention (1) has the carbon felt of carbon coating is 20nm ~ 300nm.
The particle diameter of silicon carbide micro-powder is 0.1 ~ 10 micron in the above-mentioned steps of the present invention (2).
Dipping in the above-mentioned steps of the present invention (3) is single-steeping.
Advantage of the present invention and beneficial effect:
The present invention with the dull and stereotyped carbon felt of PAN base as starting material, rationally control the proportioning of silica flour and resol, and the introducing silicon carbide micro-powder of maximum, the content that can prepare free silica in the goods only accounts for 3% ~ 8%, open porosity is less than 3% quality products, thereby realized improving the density of goods, reduced the effect of the fragility of stupalith.
2. C/C-SiC ceramic composite of the present invention is owing to having added silicon carbide micro-powder, and its goods density improves, and density reaches 2.30 ~ 2.70 gram per centimeters
3Between (at present, the composite density of the type of prior art is at 1.8 ~ 2.3 gram per centimeters
3Between), therefore, preparing the goods of volume size of the same race, it is large that the carborundum content of C/C-SiC ceramic composite of the present invention is wanted, and contents of free si is low, and its hardness and antiwear property will strengthen greatly.The present invention adopts cheaply the dull and stereotyped carbon felt of PAN base etc. as strengthening body, and carbon coating thickness is controlled at 20nm ~ 300nm, and it makes carbon fiber avoid being reacted as protective layer; The concentration of control resol and the addition of silicon carbide powder; Adopt phenol resin solution to introduce carborundum powder and form the disposable dipping compression moulding of slip, improve the effect of single-steeping, shortened the production cycle; And the addition of the rational technical recipe control of process free silica, the porosity of reduction goods, the fragility of reduction matrix material finally realize the preparation of C/C-SiC ceramic composite, and density reaches 2.30 ~ 2.70 gram per centimeters
3
3. the invention provides a kind of employing cheaply the dull and stereotyped carbon felt of PAN base and liquid phenolic resin prepare the C/C precast body, adopt that preparation cycle is short, the low-cost C/C-SiC ceramic composite of the simple liquid Si infiltration technology of device requirement (LSI) preparation.Utilize its high temperature resistant, wear-resisting ability that undermines high tenacity, the material of preparation is applicable to the heat resistant and wear resistants such as high conductive wear resistant material, Electric conductive slider material and heating-furnace bottom lining plate and decreases material.And therefore starting material (the dull and stereotyped carbon felt of PAN base, silicon carbide powder and resol) price is a kind of low-cost technology of preparing, and is fit to batch production far below trichloromethyl silane and Polycarbosilane that CVI technique and PIP technique adopt; And preparation technology of the present invention has inherited CVI technique and PIP technique can prepare any complicated shape goods, be easy to the advantage of suitability for industrialized production, is a kind of preparation method who has the Continuous Fiber Reinforced Ceramic Matrix Composites of through engineering approaches application prospect.This matrix material has preferably toughness, high strength, high temperature resistant, anticorrosive, and the goods density is high, and porosity is little, and raw materials cost is cheap, is applicable to the heat resistant and wear resistants such as heating-furnace bottom lining plate, electric car electricity consumption sliding block material and high conductive wear resistant material and decreases material.
4. the present invention adopts disposable impregnating by pressure and one-step solidification technique, then adopts extrusion forming under the normal temperature, and resin and silicon carbide micro-powder are fully infiltrated in the carbon felt body, has shortened greatly preparation cycle, raises the efficiency, and reduces manufacturing cost.
5. the preparation cycle of C/C-SiC ceramic composite of the present invention is short, and technique is simple, device simple, and easy handling is suitable for batch production.
Description of drawings
The crystalline phase picture of 400 times of C/C-SiC ceramic composites of Fig. 1 embodiment 1.
The crystalline phase picture of 400 times of C/C-SiC ceramic composites of Fig. 2 embodiment 2.
The crystalline phase picture of 400 times of C/C-SiC ceramic composites of Fig. 3 embodiment 3.
Among the figure: the strip of grey or columned be the wild phase carbon fiber, white bright be free silica, black be carbon or pore.
Preparation technology's schema of Fig. 4 carbon of the present invention/carbon-silicon carbide ceramic composite.
Embodiment
The invention is further illustrated by the following examples, but the present invention not only is confined to following examples.
The equipment that preparation process of the present invention is used is the equipment of industry universal, does not contain hazardous substance in the final C/C-SiC ceramic composite of preparation.
Embodiment 1
Take by weighing the raw material of following formula rate: resol 960 grams, dehydrated alcohol 120 grams, then acetone 120 grams add 643 gram micron order silicon carbide (SiC) powder, and the method for ball milling (ordinary method) mixes, as dipping sizing agent.
Press following explained hereafter:
(1) carbon coating: first with the dull and stereotyped carbon felt of commercially available (thickness is 6mm or 10mm) PAN base as strengthening body, adopt isothermal CVD technique to prepare carbon coating (industry common process), it is 900 ℃ at depositing temperature, under-0.098MPa the vacuum condition, be that the high pure nitrogen of 20ml/min is that diluent gas and flow are that the propylene of 200ml/min is the RESEARCH OF PYROCARBON source of the gas with flow, then under the protection of high-purity argon gas, temperature is raised to 1100 ℃ of depositions, and obtaining pyrocarbon coating thickness is the dull and stereotyped carbon felt of PAN base of 100nm;
(2) preparation dipping sizing agent: with resol, acetone and the ethanol solution of above-mentioned formula rate totally 1200 grams, and the micron order silicon carbide of 643 grams mix and obtain mass percent and be about 35% micron order SiC dipping slurry;
(3) vacuum pressure impregnation: the dull and stereotyped carbon felt of the base of the PAN after step (1) the deposit carbon coating is immersed in the slurry of step (2) gained, put into single-steeping, to vacuumize 15min in the vacuum pressure tank first, is pressurize 60min under the 1.2Mpa at impregnation pressure then, obtains preimpregnation carbon felt;
(4) with the preimpregnation carbon felt of step (3) gained with the pressure compacting of 2MPa extruding part resin simultaneously;
(5) solidify: the preimpregnation carbon felt of step (4) gained was put into first 60 ℃ of baking ovens 8 hours, makes that organic solvent fully volatilizees in the felt body, after put into 120 ℃ baking oven and be incubated 12 hours and finish curing;
(6) carbonization: the preimpregnation carbon felt after step (5) curing is carried out carbonizing treatment in rare gas element (such as argon gas) environment, vacuumize in the sintering oven, control pressure is below 15Pa, by heat base substrate to 900 ℃ of 80 ~ 100 ℃/hour temperature rise rate, be incubated 1 hour and obtain carbon/carbon porous preform;
(7) silication: the carbon of step (6)/carbon porous preform is placed in the silica flour, precast body and silica flour weight ratio are 1:1.1, under rare gas element (such as argon gas) protection, control pressure is below 30Pa, by heat base substrate to 1550 ℃ of 200 ~ 300 ℃/hour temperature rise rate, sintering obtains C/C-SiC ceramic composite matrix;
(8) alkaline purification: it is that 350 ~ 400 ℃ molten caustic(soda) is processed that the base substrate behind step (7) sintering is put into temperature, and treatment time 30min to remove the product surface residual silicon, namely obtains cheaply C/C-SiC ceramic composite of the present invention.
The density of embodiment 1 gained sample specimens is 2.48 gram per centimeters
3, open porosity is 2.03%, three-point bending strength reaches 213MPa.
Embodiment 2:
Take by weighing the raw material of following formula rate: resol 960 grams, then dehydrated alcohol 120 grams and acetone 120 grams add 982 gram micron order silicon carbide (SiC) powder, and the method for ball milling mixes.
Preparation technology is with embodiment 1, and extrudate density is 2.52g/cm
3Open porosity is 1.96%, and three-point bending strength reaches 198MPa.
Embodiment 3:
Take by weighing the raw material of following formula rate: phenol resin solution 960 grams, then anhydrous methanol 120 grams and acetone 120 grams add 514 gram micron order silicon carbide (SiC) powder, and the method for ball milling mixes.
Preparation technology is with embodiment 1, and extrudate density is 2.45g/cm
3Open porosity is 2.91%, and three-point bending strength reaches 176MPa.
Claims (5)
1. the preparation method of carbon/carbon-silicon carbide ceramic composite, it is characterized in that: preparation process comprises:
(1) with the dull and stereotyped carbon felt of PAN base as strengthening body, adopt isothermal CVD technique to prepare carbon coating, take propylene as the RESEARCH OF PYROCARBON source of the gas, nitrogen is diluent gas, depositing temperature is 800～1200 ℃, and depositing time is 10～150min, obtains the dull and stereotyped carbon felt of PAN base that the surface has carbon coating;
(2) select and add acetone, methyl alcohol or ethanol in the resol, weight ratio is 3～18:1:1, adds silicon carbide micro-powder mixing manufacture form slurry again, and wherein resol and silicon carbide micro-powder weight ratio are 1～27:3;
(3) the carbon felt with step (1) gained immerses in the slurry of step (2) gained, then putting into the vacuum pressure tank floods, vacuum tightness in the vacuum pressure tank is-0.08～-0.10MPa, pressure are 0.1～3.0MPa, the dwell time is that 15～240min obtains preimpregnation carbon felt;
(4) with preimpregnation carbon felt compacting under the pressure of 0.1～20MPa of step (3) gained;
(5) be that 100～200 ℃, soaking time are to solidify under 2～20 hours the condition with the preimpregnation carbon felt of the compacting of step (4) gained in temperature;
(6) the carbon felt after step (5) is solidified is heated to 800～1200 ℃ with 80～100 ℃/hour temperature rise rates in vacuum or inert gas environment, and insulation 30～240min carries out carbonizing treatment, obtains carbon/carbon porous preform;
(7) precast body with step (6) gained is placed in the silica flour, precast body and silica flour weight ratio are 1:0.9～1.3, under vacuum or protection of inert gas, be heated to 1450～1800 ℃ with 200～300 ℃/hour temperature rise rates, insulation 30～240min finishes sintering;
(8) base substrate behind step (7) sintering being put into temperature is that 350～550 ℃ molten caustic(soda) is processed, and the treatment time is 10～90min, removes the product surface residual silicon, namely obtains carbon/carbon-silicon carbide ceramic composite.
2. the preparation method of carbon according to claim 1/carbon-silicon carbide ceramic composite is characterized in that: the dull and stereotyped carbon felt of PAN base in the step (1) is that density is 0.05～0.50 gram per centimeter
3The dull and stereotyped carbon felt of PAN base.
3. the preparation method of carbon according to claim 1/carbon-silicon carbide ceramic composite is characterized in that: to have the carbon coating thickness of the carbon felt of carbon coating be 20nm～300nm on the surface in the step (1).
4. the preparation method of carbon according to claim 1/carbon-silicon carbide ceramic composite is characterized in that: the particle diameter of silicon carbide micro-powder is 0.1～10 micron in the step (2).
5. the preparation method of carbon according to claim 1/carbon-silicon carbide ceramic composite, it is characterized in that: the dipping in the step (3) is single-steeping.
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