CN102964145A - Method for preparing coating reinforced C/SiC composite material - Google Patents
Method for preparing coating reinforced C/SiC composite material Download PDFInfo
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- CN102964145A CN102964145A CN2012105209423A CN201210520942A CN102964145A CN 102964145 A CN102964145 A CN 102964145A CN 2012105209423 A CN2012105209423 A CN 2012105209423A CN 201210520942 A CN201210520942 A CN 201210520942A CN 102964145 A CN102964145 A CN 102964145A
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- 239000011204 carbon fibre-reinforced silicon carbide Substances 0.000 title claims abstract description 65
- 238000000576 coating method Methods 0.000 title claims abstract description 40
- 239000011248 coating agent Substances 0.000 title claims abstract description 37
- 239000002131 composite material Substances 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000002002 slurry Substances 0.000 claims abstract description 22
- 230000008021 deposition Effects 0.000 claims abstract description 21
- 239000002245 particle Substances 0.000 claims abstract description 21
- 238000007581 slurry coating method Methods 0.000 claims abstract description 10
- 239000011241 protective layer Substances 0.000 claims abstract description 7
- 238000000151 deposition Methods 0.000 claims description 49
- 239000011159 matrix material Substances 0.000 claims description 49
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 24
- 239000007789 gas Substances 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 17
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 15
- 229910052786 argon Inorganic materials 0.000 claims description 12
- 238000000498 ball milling Methods 0.000 claims description 12
- 239000003085 diluting agent Substances 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 238000002360 preparation method Methods 0.000 claims description 12
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 11
- 239000001257 hydrogen Substances 0.000 claims description 11
- 229910052739 hydrogen Inorganic materials 0.000 claims description 11
- DWAWYEUJUWLESO-UHFFFAOYSA-N trichloromethylsilane Chemical compound [SiH3]C(Cl)(Cl)Cl DWAWYEUJUWLESO-UHFFFAOYSA-N 0.000 claims description 11
- 230000008595 infiltration Effects 0.000 claims description 10
- 238000001764 infiltration Methods 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 10
- 239000000835 fiber Substances 0.000 claims description 8
- 239000012159 carrier gas Substances 0.000 claims description 7
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 claims description 7
- 239000004902 Softening Agent Substances 0.000 claims description 5
- 239000011230 binding agent Substances 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 238000005229 chemical vapour deposition Methods 0.000 claims description 5
- 239000006185 dispersion Substances 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 5
- DQWPFSLDHJDLRL-UHFFFAOYSA-N triethyl phosphate Chemical compound CCOP(=O)(OCC)OCC DQWPFSLDHJDLRL-UHFFFAOYSA-N 0.000 claims description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 4
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 4
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 claims description 4
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 claims description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 4
- 239000011268 mixed slurry Substances 0.000 claims description 4
- DHKHKXVYLBGOIT-UHFFFAOYSA-N acetaldehyde Diethyl Acetal Natural products CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 claims description 2
- 125000002777 acetyl group Chemical class [H]C([H])([H])C(*)=O 0.000 claims description 2
- 239000004917 carbon fiber Substances 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims description 2
- 239000010410 layer Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000011148 porous material Substances 0.000 abstract 2
- 239000000758 substrate Substances 0.000 abstract 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical class [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 58
- 229910010271 silicon carbide Inorganic materials 0.000 description 57
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 9
- 238000013016 damping Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000002708 enhancing effect Effects 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000003475 lamination Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000007669 thermal treatment Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 238000002679 ablation Methods 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 235000006708 antioxidants Nutrition 0.000 description 1
- 239000000919 ceramic Substances 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
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 230000016507 interphase Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
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- Crystals, And After-Treatments Of Crystals (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
Abstract
本发明涉及一种涂层增强C/SiC复合材料的制备方法，技术方案是：在C/SiC复合材料试样表面涂覆浆料涂层，有助于填充由预制体结构残留的孔隙和CVI瓶颈工艺造成的孔隙，提高复合材料致密性，并能有效缓解C/SiC复合材料与SiC保护层之间的模量失配，提高复合材料的强韧性。与现有技术C/SiC复合材料相比，二维SiC晶须涂层增强C/SiC复合材料室温下弯曲强度为480-502MPa，二维SiC颗粒涂层增强C/SiC复合材料室温下弯曲强度为440-470MPa，二维(SiC晶须+SiC颗粒)涂层增强C/SiC复合材料室温下弯曲强度为485-515MPa。通过控制沉积时间控制PyC和SiC基体和保护层的厚度，通过控制浆料粘度和涂覆次数控制浆料涂层厚度，实现复合材料结构控制。
The invention relates to a method for preparing a coating-reinforced C/SiC composite material. The technical proposal is: coating a slurry coating on the surface of a C/SiC composite material sample helps to fill the remaining pores and CVI of the prefabricated body structure. The pores caused by the bottleneck process can improve the compactness of the composite material, and can effectively alleviate the modulus mismatch between the C/SiC composite material and the SiC protective layer, and improve the strength and toughness of the composite material. Compared with the prior art C/SiC composites, the flexural strength of C/SiC composites enhanced by two-dimensional SiC whisker coatings at room temperature is 480-502 MPa, and the flexural strength of C/SiC composites enhanced by two-dimensional SiC particle coatings at room temperature The flexural strength of the two-dimensional (SiC whisker + SiC particles) coating reinforced C/SiC composite material is 485-515MPa at room temperature. Control the thickness of PyC and SiC substrates and protective layers by controlling the deposition time, and control the thickness of the slurry coating by controlling the viscosity of the slurry and the number of coatings to achieve composite material structure control.
Description
Technical field
The invention belongs to the composite manufacture method, relate to a kind of coating and strengthen C/SiC composite manufacture method.
Background technology
It is low and density large, stupalith fragility large and the shortcoming such as poor reliability that the C/SiC ceramic matric composite has overcome the metallic substance heatproof, has high temperature resistant, low density, high than strong, Gao Bimo, anti-oxidant, anti-ablation, insensitive to crackle, the characteristics such as calamitous damage do not occur, and are with a wide range of applications at aerospace field.Development along with aeronautical and space technology, member increase in demand to the preparation of C/SiC matrix material, its characteristics be wide in variety, quantity large, require high, because the working conditions of member is different, as: the leading edge of a wing requires material to have high strength, combustion chamber and jet pipe require material to have high tenacity, and the driving bearing of combination wing flap requires material to have simultaneously high strength and high tenacity.Thereby to the mechanical property of C/SiC matrix material, different requirements has been proposed.
The Xiao Peng of China Central South University etc. is published in being entitled as in " microtexture and the bending property of the standby C/SiC matrix material of CVI-RMI legal system " literary composition of " Central South University's journal " the 38th volume in 2007 the 3rd phase p381-385, adopt CVI-RMI to prepare the C/SiC matrix material, flexural strength is 133MPa.The Xu Yongdong that NW China industry is large etc. is published in being entitled as in " Continuous Fiber Reinforced Silicon Carbide Composites research " literary composition of " silicate journal " the 30th volume in 2002 the 2nd phase p184-188, system introduction the mechanical property of C/SiC matrix material, its bending strength is 450MPa.Deposit pyrocarbon coating between fiber and the matrix, be conducive to extracting of fiber, but the mechanical property raising is limited.The Wang Wei of NW China polytechnical university, Cheng Laifei etc. are published in being entitled as in " research of 2D C/SiC matrix material damping capacity " literary composition of " solid-rocket technology " the 29th volume in 2006 the 6th phase p455-459, and the damping behavior of 2D C/SiC matrix material is described in detail.This article relates to specimen surface deposition SiC coating, and the matrix material porosity reduces, material damping performance decrease.
Summary of the invention
The technical problem that solves
For fear of the deficiencies in the prior art part, the present invention proposes a kind of coating and strengthens C/SiC composite manufacture method, overcome the control of prior art C/SiC composite structure limited, further improve obdurability and have circumscribed deficiency.
Technical scheme
A kind of coating strengthens C/SiC composite manufacture method, it is characterized in that step is as follows:
Step 1 preparation SiC slurry:
Step a1: as solution, with SiC wet mixing ball milling 30～60min, oven dry obtains powder take volume fraction as 20～30% alcohol;
Step b1: be 10～20% with the powder total volume fraction, ethanol and acetone are that the solvent volume mark is respectively 30～40% and 20～30%, and triethyl phosphate is dispersion agent 2～3%, mixes rear ball milling 3～5h;
Step c1: adding polyvinyl butyral acetal PVB binding agent volume fraction is 3～4% again, and dioctyl phthalate (DOP) softening agent volume fraction 2～3% continues ball milling 5～7h; Then vacuum stripping bubble 20～30min makes stable slurry;
Step 2 preparation coating strengthens the C/SiC matrix material:
Step 2a: with carbon fiber two-dimension laminate establishment precast body, fraction volume of fiber is 30～40%;
Step 2b: take third rare as the source material, argon gas is diluent gas, adopts chemical vapor infiltration at carbon fabric perform surface deposition PyC interfacial layer, and depositing temperature is 900～1000 ℃, and depositing time is 100～200h;
Step 2c: under 1600～1800 ℃ of conditions of temperature, insulation 1～3h heat-treats;
Step 2d: adopt chemical vapor infiltration deposition SiC matrix, mode of deposition is as follows: trichloromethyl silane is the source material, argon gas is diluent gas, hydrogen is carrier gas, the mol ratio of hydrogen and trichloromethyl silane is 10:1, depositing temperature is 1000～1100 ℃, and depositing time 320～400h forms the C/SiC matrix material;
Step 3: apply the SiC slurry coating at the C/SiC composite material surface; adopt chemical Vapor deposition process at C/SiC composite material surface deposition SiC protective layer; mode of deposition is as follows: trichloromethyl silane is the source material; argon gas is diluent gas; hydrogen is carrier gas, and the mol ratio of hydrogen and trichloromethyl silane is 10:1, and depositing temperature is 1000～1100 ℃; depositing time 80～100h obtains coating and strengthens the C/SiC matrix material.
Described SiC slurry is SiC whisker slurry, SiC particle slurry or SiC whisker and SiC particle mixed slurry.
The mass ratio of described SiC whisker and SiC particle mixed slurry is 2:1～1:1.
It is that 0.5 μ m and mean length are 18 μ m SiC whiskers that described SiC whisker adopts mean diameter.
The median size of described SiC particle is 1.5 μ m SiC particles.
Beneficial effect
A kind of coating that the present invention proposes strengthens C/SiC composite manufacture method; thickness by control depositing time control PyC and SiC matrix and protective layer; by control slurry viscosity and coating number of times control slurry coating thickness, form coating and strengthen the C/SiC matrix material.Preparation method of the present invention improves the obdurability of C/SiC matrix material, and can control material structure.
The invention has the beneficial effects as follows: apply slurry coating at C/SiC matrix material specimen surface; help to fill the hole that is caused by the residual hole of precursor structure and CVI bottleneck technique; improve matrix material compactness; and can effectively alleviate modulus mismatch between C/SiC matrix material and the SiC protective layer, improve the obdurability of matrix material.Compare with prior art C/SiC matrix material, flexural strength is 480-502MPa under the two dimension SiC whisker coating enhancing C/SiC matrix material room temperature, flexural strength is 440-470MPa under the two dimension SiC particulate coating enhancing C/SiC matrix material room temperature, and flexural strength is 485-515MPa under two dimension (SiC whisker+SiC particle) coating enhancing C/SiC matrix material room temperature.
Description of drawings
Fig. 1 is C/SiC composite manufacture schema of the present invention;
Fig. 2 is the microstructure characteristic that the prepared SiC whisker coating of the inventive method strengthens the C/SiC matrix material;
Fig. 3 is the microstructure characteristic that the prepared SiC particulate coating of the inventive method strengthens the C/SiC matrix material
Embodiment
Now in conjunction with the embodiments, the invention will be further described for accompanying drawing:
With reference to Fig. 1, Fig. 2 and Fig. 3.Following examples strengthen the C/SiC matrix material as example to prepare two-dimentional coating, and the present invention is elaborated.By the thickness of control depositing time control PyC and SiC matrix and protective layer, by control slurry viscosity and coating number of times control slurry coating thickness, make the matrix material densification, interphase match is reasonable, improves the obdurability of C/SiC matrix material.
Embodiment 1:
Step 1, preparation SiC whisker slurry, detailed process is:
(1) the employing length-to-diameter ratio is 8～11 SiC whisker,, ultrasonic 30 minutes, dries as solution take volume fraction as 20% alcohol;
(2) the SiC whisker is 30%, and ethanol is solvent, and triethyl phosphate is dispersion agent, ball milling 5h;
(3) in above-mentioned slurry, add the PVB binding agent, glycerol softening agent, ball milling 5h;
(4) vacuum stripping bubble 20min makes and stablizes SiC whisker slurry.
Step 2, preparation SiC whisker coating strengthens the C/SiC matrix material.Detailed process is:
(1) adopt 1K plain weave cloth lamination to prepare two-dimentional precast body, the percent by volume of fiber is 40%;
(2) take third rare as the source material, argon gas is diluent gas, adopts chemical vapor infiltration deposition PyC interface, and depositing temperature is 900 ℃, and depositing time is 100h;
(3) the PyC interface is heat-treated, thermal treatment temp is 1800 ° of C, and the time is 3h;
(4) with trichloromethyl silane (CH
3SiCl
3, MTS) being the source material, argon gas is diluent gas, hydrogen is carrier gas, H
2With the mol ratio of MTS be 10:1, adopt chemical vapor infiltration at PyC interface deposition SiC matrix, depositing temperature is 1000 ℃, depositing time is 320～400h, obtains two-dimentional C/SiC matrix material;
(5) apply SiC whisker slurry coating at C/SiC matrix material specimen surface;
(6) adopt chemical Vapor deposition process in two-dimentional C/SiC composite material surface deposition SiC coating, depositing time is 160h.
The prepared SiC whisker coating of present embodiment strengthens the C/SiC matrix material through the test of SANS CMT4304 almighty test machine, and flexural strength is 500MPa.
Embodiment 2:
Step 1, preparation SiC particle slurry.Detailed process is:
(1) adopting diameter is 0.5 μ m SiC particle,, ultrasonic 30 minutes, dries as solution take volume fraction as 20% alcohol;
(2) the SiC grain volume fraction is 30%, and ethanol is solvent, and triethyl phosphate is dispersion agent, ball milling 5h;
(3) in above-mentioned slurry, add the PVB binding agent, glycerol softening agent, ball milling 5h;
(4) vacuum stripping bubble 20min makes and stablizes the SiC particle slurry.
Step 2, preparation SiC particulate coating strengthens the C/SiC matrix material.Detailed process is:
(1) adopt 1K plain weave cloth lamination to prepare two-dimentional precast body, the percent by volume of fiber is 40%;
(2) take third rare as the source material, argon gas is diluent gas, adopts chemical vapor infiltration deposition PyC interface, and depositing temperature is 900 ℃, and depositing time is 100h;
(3) the PyC interface is heat-treated, thermal treatment temp is 1800 ° of C, and the time is 3h;
(4) with trichloromethyl silane (CH
3SiCl
3, MTS) being the source material, argon gas is diluent gas, hydrogen is carrier gas, H
2With the mol ratio of MTS be 10:1, adopt chemical vapor infiltration at PyC interface deposition SiC matrix, depositing temperature is 1000 ℃, depositing time is 320～400h, obtains two-dimentional C/SiC matrix material;
(5) at C/SiC matrix material specimen surface nickel-coated SiC particulates slurry coating;
(6) adopt chemical Vapor deposition process in two-dimentional C/SiC composite material surface deposition SiC coating, depositing time is 160h.
The prepared SiC particulate coating of present embodiment strengthens the C/SiC matrix material through the test of SANS CMT4304 almighty test machine, and flexural strength is 465MPa.
Embodiment 3: step 1, preparation (SiC whisker+SiC particle) slurry.Detailed process is:
(1) the employing length-to-diameter ratio is that 8～11 SiC whisker and diameter are 0.5 μ m SiC particle, and mass ratio is the mixed powder of 2:1,, ultrasonic 30 minutes, dries as solution take volume fraction as 20% alcohol;
(2) the powder volume fraction is 30%, and ethanol is solvent, and triethyl phosphate is dispersion agent, ball milling 5h;
(3) in above-mentioned slurry, add the PVB binding agent, glycerol softening agent, ball milling 5h;
(4) vacuum stripping bubble 20min makes stable (SiC whisker+SiC particle) slurry.
Step 2, preparation (SiC whisker+SiC particle) coating strengthens the C/SiC matrix material.Detailed process is:
(1) adopt 1K plain weave cloth lamination to prepare two-dimentional precast body, the percent by volume of fiber is 40%;
(2) take third rare as the source material, argon gas is diluent gas, adopts chemical vapor infiltration deposition PyC interface, and depositing temperature is 900 ℃, and depositing time is 100h;
(3) the PyC interface is heat-treated, thermal treatment temp is 1800 ° of C, and the time is 3h;
(4) with trichloromethyl silane (CH
3SiCl
3, MTS) being the source material, argon gas is diluent gas, hydrogen is carrier gas, H
2With the mol ratio of MTS be 10:1, adopt chemical vapor infiltration at PyC interface deposition SiC matrix, depositing temperature is 1000 ℃, depositing time is 320～400h, obtains two-dimentional C/SiC matrix material;
(5) apply (SiC whisker+SiC particle) slurry coating at C/SiC matrix material specimen surface;
(6) adopt chemical Vapor deposition process in two-dimentional C/SiC composite material surface deposition SiC coating, depositing time is 160h.
The prepared SiC whisker coating of present embodiment strengthens the C/SiC matrix material through the test of SANS CMT4304 almighty test machine, and flexural strength is 511MPa.
Claims (5)
1. a coating strengthens C/SiC composite manufacture method, it is characterized in that step is as follows:
Step 1 preparation SiC slurry:
Step a1: as solution, with SiC wet mixing ball milling 30～60min, oven dry obtains powder take volume fraction as 20～30% alcohol;
Step b1: be 10～20% with the powder total volume fraction, ethanol and acetone are that the solvent volume mark is respectively 30～40% and 20～30%, and triethyl phosphate is dispersion agent 2～3%, mixes rear ball milling 3～5h;
Step c1: adding polyvinyl butyral acetal PVB binding agent volume fraction is 3～4% again, and dioctyl phthalate (DOP) softening agent volume fraction 2～3% continues ball milling 5～7h; Then vacuum stripping bubble 20～30min makes stable slurry;
Step 2 preparation coating strengthens the C/SiC matrix material:
Step 2a: with carbon fiber two-dimension laminate establishment precast body, fraction volume of fiber is 30～40%;
Step 2b: take third rare as the source material, argon gas is diluent gas, adopts chemical vapor infiltration at carbon fabric perform surface deposition PyC interfacial layer, and depositing temperature is 900～1000 ℃, and depositing time is 100～200h;
Step 2c: under 1600～1800 ℃ of conditions of temperature, insulation 1～3h heat-treats;
Step 2d: adopt chemical vapor infiltration deposition SiC matrix, mode of deposition is as follows: trichloromethyl silane is the source material, argon gas is diluent gas, hydrogen is carrier gas, the mol ratio of hydrogen and trichloromethyl silane is 10:1, depositing temperature is 1000～1100 ℃, and depositing time 320～400h forms the C/SiC matrix material;
Step 3: apply the SiC slurry coating at the C/SiC composite material surface; adopt chemical Vapor deposition process at C/SiC composite material surface deposition SiC protective layer; mode of deposition is as follows: trichloromethyl silane is the source material; argon gas is diluent gas; hydrogen is carrier gas, and the mol ratio of hydrogen and trichloromethyl silane is 10:1, and depositing temperature is 1000～1100 ℃; depositing time 80～100h obtains coating and strengthens the C/SiC matrix material.
2. described coating strengthens C/SiC composite manufacture method according to claim 1, and it is characterized in that: described SiC slurry is SiC whisker slurry, SiC particle slurry or SiC whisker and SiC particle mixed slurry.
3. described coating strengthens C/SiC composite manufacture method according to claim 2, and it is characterized in that: the mass ratio of described SiC whisker and SiC particle mixed slurry is 2:1～1:1.
4. described coating strengthens C/SiC composite manufacture method according to claim 2, it is characterized in that: it is that 0.5 μ m and mean length are 18 μ m SiC whiskers that described SiC whisker adopts mean diameter.
5. described coating strengthens C/SiC composite manufacture method according to claim 2, and it is characterized in that: the median size of described SiC particle is 1.5 μ m SiC particles.
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