CN105541415A - Ceramic-based composite material densification preparation method - Google Patents
Ceramic-based composite material densification preparation method Download PDFInfo
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- CN105541415A CN105541415A CN201510940628.4A CN201510940628A CN105541415A CN 105541415 A CN105541415 A CN 105541415A CN 201510940628 A CN201510940628 A CN 201510940628A CN 105541415 A CN105541415 A CN 105541415A
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- ceramic matric
- matric composite
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- composite material
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- 239000002131 composite material Substances 0.000 title claims abstract description 53
- 239000000919 ceramic Substances 0.000 title claims abstract description 37
- 238000000280 densification Methods 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000011248 coating agent Substances 0.000 claims abstract description 32
- 238000000576 coating method Methods 0.000 claims abstract description 32
- 239000000843 powder Substances 0.000 claims abstract description 21
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 18
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000003292 glue Substances 0.000 claims abstract description 13
- 238000000151 deposition Methods 0.000 claims abstract description 12
- 230000008021 deposition Effects 0.000 claims abstract description 9
- 239000012153 distilled water Substances 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 238000005498 polishing Methods 0.000 claims abstract description 7
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 7
- 239000011863 silicon-based powder Substances 0.000 claims abstract description 6
- 238000000498 ball milling Methods 0.000 claims abstract description 5
- 230000007547 defect Effects 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 239000002002 slurry Substances 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims abstract description 5
- 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 claims description 33
- 239000007789 gas Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 13
- 230000001680 brushing effect Effects 0.000 claims description 9
- 239000006255 coating slurry Substances 0.000 claims description 9
- 239000010703 silicon Substances 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 239000011259 mixed solution Substances 0.000 claims description 5
- 238000003760 magnetic stirring Methods 0.000 claims description 4
- 239000012159 carrier gas Substances 0.000 claims description 3
- 239000006185 dispersion Substances 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000000376 reactant Substances 0.000 claims description 3
- 238000011282 treatment Methods 0.000 claims description 3
- DWAWYEUJUWLESO-UHFFFAOYSA-N trichloromethylsilane Chemical compound [SiH3]C(Cl)(Cl)Cl DWAWYEUJUWLESO-UHFFFAOYSA-N 0.000 claims description 3
- 108010010803 Gelatin Proteins 0.000 claims description 2
- 229920000159 gelatin Polymers 0.000 claims description 2
- 239000008273 gelatin Substances 0.000 claims description 2
- 235000019322 gelatine Nutrition 0.000 claims description 2
- 235000011852 gelatine desserts Nutrition 0.000 claims description 2
- 230000003647 oxidation Effects 0.000 abstract description 6
- 238000007254 oxidation reaction Methods 0.000 abstract description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 4
- 238000005229 chemical vapour deposition Methods 0.000 abstract description 3
- 238000009413 insulation Methods 0.000 abstract description 2
- 229920002689 polyvinyl acetate Polymers 0.000 abstract 1
- 239000011159 matrix material Substances 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000004580 weight loss Effects 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 240000003936 Plumbago auriculata Species 0.000 description 1
- 239000011157 advanced composite material Substances 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052810 boron oxide Inorganic materials 0.000 description 1
- 150000001722 carbon compounds Chemical class 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000011284 combination treatment Methods 0.000 description 1
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/52—Multiple coating or impregnating multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/89—Coating or impregnation for obtaining at least two superposed coatings having different compositions
Abstract
The invention discloses a ceramic-based composite material densification preparation method. The preparation method comprises putting silicon powder and silicon carbide whisker into an agate ball milling tank according to a mass ratio of 20-40%: 60-80%, carrying out ball milling, pouring polyvinyl alcohol (PVA) and distilled water into a clean container according to a mass ratio of 50-60%: 40-50%, carrying out stirring at a constant temperature of 70-90 DEG C until the glue solution is completely dissolved, mixing the PVA glue solution and the ball-milled powder according to a mass ratio of 1: 1-3 to obtain a uniform mixture, uniformly coating the surface of the composite material with the slurry through a hairbrush, putting the composite material into an oven at a temperature of 150-200 DEG C, carrying out drying for 5-10h, carrying out polishing and flatting, putting the composite material into a chemical vapor deposition (CVD) furnace, carrying out thermal insulation at a temperature of 1000-1200 DEG C for 4-6h and carrying out silicon carbide coating deposition. The ceramic-based composite material can fast fill defects such as pits and holes and improve surface flatness. The ceramic-based composite material can greatly improve composite material high temperature oxidation performances in a high temperature environment.
Description
Technical field
The present invention relates to a kind of method of ceramic matric composite quick densifying.
Background technology
Ceramic matric composite has the excellent performance such as high temperature resistant, intensity is high, density is low, anticorrosive and low thermal expansivity, has become one of the advanced composite material of the heat-resistant parts such as Aeronautics and Astronautics, high-strength parts most potentiality.Adopt chemical vapor infiltration (CVI) technique when preparing ceramic matric composite, the inevitably hole of residual 10 ~ 15%, in order to obtain fine and close ceramic matric composite, the CVI densification of many heats must be carried out, waste time and energy, running cost is higher.And, because the thermal expansivity of ceramic matric composite (as carbon fiber and SiC matrix) is different, composite inner can produce a large amount of fine cracks, if do not carry out surface densification process, the existence of hole and fine crack can affect mechanics and the resistance to elevated temperatures of matrix material, and high temperature resistant long-life application is also restricted.
Number of patent application " CN200610091393.7 " describes a kind of carbon/carbon composite material base silicon carbide coating layer and preparation method thereof, the method adopts the silica flour of different percentage composition, carbon dust, carborundum powder and boron oxide powder mix to be mixed into embedding powder, then matrix material is embedded in plumbago crucible, adopts vacuum oven to heat 1500 DEG C and fire coat of silicon carbide.It is not only comparatively large to powder waste that this powder entrapping method prepares carbon/carbon compound material, and the powder meeting bonding composites of melting, brings difficulty to following process.
Summary of the invention
During in order to overcome prior art preparation fine and close coat of silicon carbide, densification cycle is long, cost is high, waste time and energy (CVI), and powder is wasted greatly, is unfavorable for the problems such as cleaning (RMI), the invention provides a kind of preparation method of ceramic matric composite densification.
The technical solution adopted for the present invention to solve the technical problems:
A preparation method for ceramic matric composite quick densifying, its special character is: comprise the following steps:
1) method of brushing is used to carry out elementary densification to ceramic matric composite surface
1.1) external coating slurry is prepared
A) Si powder and silicon carbide whisker are added ball grinder for 2:8 ~ 4:6 in mass ratio, carry out being mixed to form mixed solution with distilled water, mixed solution is dried and forms external coating powder;
B) surperficial brushwork gelatin is prepared
Polyvinyl alcohol is mixed for 1:1 ~ 3:2 in mass ratio with distilled water, forms external coating glue;
C) external coating glue is joined in external coating powder, mix and form external coating slurry;
1.2) with the workpiece surface of external coating slurry brushing ceramic matric composite;
1.3) ceramic matric composite workpiece is dried;
1.4) polishing ceramic matric composite workpiece, if any surface imperfection repeating step 1.2)-1.3);
2) ceramic matric composite workpiece qualified for surface is carried out secondary densification by surface carbonation silicon coating deposition.
The mass ratio of above-mentioned external coating powder and external coating glue is: 2:3 ~ 3:2 mixes.
Above-mentioned steps a) in Si powder be that ball milling mixes with mixing of silicon carbide whisker.
Above-mentioned steps b) in polyvinyl alcohol utilize magnetic stirrer to mix with mixing of distilled water, mixing temperature 70 ~ 90 DEG C, agitator speed is 3 ~ 4 revolutions per seconds, and churning time is 50 ~ 100 minutes; After stirring, carry out 10 ~ 15 minutes ultrasonic wave dispersion treatment, make external coating glue.
Above-mentioned steps c) in, external coating glue and external coating powder are uniformly mixed by magnetic stirring apparatus, and agitator speed is 3 ~ 4 revolutions per seconds, and churning time is 50 ~ 100 minutes, makes external coating slurry.
Above-mentioned 1.2) be specially:
1.2.1) with file polishing ceramic matric composite workpiece surface, remove surface scum and particle, then clean and dry workpiece;
1.2.2) use hairbrush to dip slurry, be evenly brushed to surface, altogether brush 3 ~ 4 times, pause after each brushing and brush again next time for 5 ~ 8 minutes, ensure that composite material surface covers completely.
Above-mentioned steps 1.3) drying condition be: oven temperature is 150 ~ 200 DEG C, and drying time is 5 ~ 10 hours.
Above-mentioned steps 1.4) polishing be specially:
First with 100# or 200# model flint paper buffing work-piece surface to local fiber exposure, then use 1000#, 1500# and 2000# model fine sandpaper buffing work-piece surface to smooth respectively, without defects such as pit, projection, holes.
Above-mentioned steps 1.5) surface carbonation silicon coating deposition be specially:
Be incubated 4 ~ 6 hours after first workpiece being warmed up to 1000 ~ 1200 DEG C, and then pass into reactant gases and carry out surface carbonation silicon coating deposition; Cvd furnace is evacuated to 1 ~ 5kPa, using flow be the Ar gas of 4 ~ 10L/min as shielding gas, flow is the H of 4 ~ 10L/min
2gas is as the gas of carrier gas of trichloromethyl silane, and depositing time is 60 ~ 100 hours.
Compared with prior art, beneficial effect is in the present invention:
1, the method adopting top layer brushing powdery pulp high temperature sintering+surface deposition coat of silicon carbide to combine, at the silicon carbide layer that composite material surface preparation is fine and close, can greatly improve ceramic matric composite densification rate, shorten process cycle, improve high-temp antioxidizing performance.Needed for bar shaped style (D refraction statics) densification prepared in this programme, heat is 8 ~ 9 stoves, and non-slurry part needs more than 12 heats ability surface densification.
2, the present invention adopts the method for brushing to carry out elementary densification, and this method is minimum to powder waste, nor can have influence on following process.
3, the ceramic matric composite coat of silicon carbide surfacing adopting the present invention to prepare is fine and close, and high temperature oxidation weightlessness is about 1.99%, is about 4.68% without oxidative mass loss under the matrix material equal ambient of sintering+coat of silicon carbide.
Accompanying drawing explanation
The composite material surface pattern of the non-densification of Fig. 1;
The composite material surface pattern of Fig. 2 densification;
The composite material surface pattern contrast of Fig. 3 densification and non-densification;
The surface topography of Fig. 4 melting powder blocking hole pit;
Composite material surface pattern before and after Fig. 5 densification.
Embodiment
Below in conjunction with drawings and Examples, the present invention is elaborated.
Embodiment 1
A () takes the Si powder that mass percent is 30% respectively, mass percent is the silicon carbide whisker of 70%, be placed in agate jar, add the ball milling combination treatment that distilled water carries out 10 hours, mixed solution is taken out the powder of drying and making external coating;
B () takes the polyvinyl alcohol that mass percent is 60% respectively, mass percent is the distilled water of 40%, be heated to 80 DEG C, stir with magnetic stirring apparatus, agitator speed is 4 revolutions per seconds, churning time is 60 minutes, then carries out 15 minutes ultrasonic wave dispersion treatment, makes external coating glue;
C glue that step (b) is prepared by () is poured in the powder of step (a), then stirs with magnetic stirring apparatus, and agitator speed is 4 revolutions per seconds, and churning time is 60 minutes, makes external coating slurry;
D (), with file buffing work-piece surface, is removed surface scum and particle, is then cleaned and dry matrix material.Use hairbrush to dip slurry, be evenly brushed to surface, altogether brush 3 times, pause after each brushing and brush again next time for 5 minutes, ensure that composite material surface covers completely;
E the matrix material of step (d) is put into baking oven by (), oven temperature is 180 DEG C, and drying time is 5 hours;
F the matrix material of step (e) takes out by (), first with 100# or 200# model flint paper buffing work-piece surface to local fiber exposure, then use 1000#, 1500# and 2000# model fine sandpaper buffing work-piece surface to smooth respectively, without defects such as pit, projection, holes.As defectiveness, repeating step (d) ~ (f) is until zero defect.
G chemical vapor deposition stove (be called for short CVD) put into by the workpiece of step (f) by (), be incubated 5 hours after being warmed up to 1100 DEG C, and then passes into reactant gases and carry out surface carbonation silicon coating deposition.Cvd furnace is evacuated to 1kPa, with flow be the Ar gas of 8L/min as shielding gas, flow is the H of 8L/min
2gas is as the gas of carrier gas of trichloromethyl silane, and depositing time is 70 hours.
The ceramic matric composite adopting the present embodiment 1 to prepare comprises powder sintering layer and CVD silicon carbide is coated with, and two-layer interaction improves the high-temperature oxidation resistance of product.According to thermooxidizing weightless test result: do not have coating composite material under 700 DEG C of aerobic high temperature, after insulation 10h, oxidation weight loss 4.68%; There is the matrix material of sinter fuse coating and CVD coating, in the same condition, oxidation weight loss 1.99%.Therefore, ceramic matric composite coat of silicon carbide prepared by this programme, the oxidative mass loss in high-temperature oxidation environment is less more than 2 times than not having the oxidative mass loss of cated matrix material.
Claims (9)
1. a preparation method for the fast densification of ceramic matric composite, is characterized in that: comprise the following steps:
1) method of brushing is used to carry out elementary densification to ceramic matric composite surface
1.1) external coating slurry is prepared
A) Si powder and silicon carbide whisker are added ball grinder for 2:8 ~ 4:6 in mass ratio, carry out being mixed to form mixed solution with distilled water, mixed solution is dried and forms external coating powder;
B) surperficial brushwork gelatin is prepared
Polyvinyl alcohol is mixed for 1:1 ~ 3:2 in mass ratio with distilled water, forms external coating glue;
C) external coating glue is joined in external coating powder, mix and form external coating slurry;
1.2) with the workpiece surface of external coating slurry brushing ceramic matric composite;
1.3) ceramic matric composite workpiece is dried;
1.4) polishing ceramic matric composite workpiece, if any surface imperfection repeating step 1.2)-1.3);
2) ceramic matric composite workpiece qualified for surface is carried out secondary densification by surface carbonation silicon coating deposition.
2. the preparation method of ceramic matric composite densification according to claim 1, is characterized in that:
The mass ratio of described external coating powder and external coating glue is: 2:3 ~ 3:2 mixes.
3. the preparation method of the ceramic matric composite densification according to right 1 or 2, is characterized in that:
Step a) in Si powder be that ball milling mixes with mixing of silicon carbide whisker.
4. the preparation method of the ceramic matric composite densification according to right 1 or 2, is characterized in that:
Step b) in polyvinyl alcohol utilize magnetic stirrer to mix with mixing of distilled water, mixing temperature 70 ~ 90 DEG C, agitator speed is 3 ~ 4 revolutions per seconds, and churning time is 50 ~ 100 minutes; After stirring, carry out 10 ~ 15 minutes ultrasonic wave dispersion treatment, make external coating glue.
5. the preparation method of the ceramic matric composite densification according to right 1 or 2, it is characterized in that: step c) in, external coating glue and external coating powder are uniformly mixed by magnetic stirring apparatus, agitator speed is 3 ~ 4 revolutions per seconds, churning time is 50 ~ 100 minutes, makes external coating slurry.
6. the preparation method of the ceramic matric composite densification according to right 1, is characterized in that:
Described 1.2) be specially:
1.2.1) with file polishing ceramic matric composite workpiece surface, remove surface scum and particle, then clean and dry workpiece;
1.2.2) use hairbrush to dip slurry, be evenly brushed to surface, altogether brush 3 ~ 4 times, pause after each brushing and brush again next time for 5 ~ 8 minutes, ensure that composite material surface covers completely.
7. the preparation method of the ceramic matric composite densification according to right 1, is characterized in that:
Step 1.3) drying condition be: oven temperature is 150 ~ 200 DEG C, and drying time is 5 ~ 10 hours.
8. the preparation method of the ceramic matric composite densification according to right 1, is characterized in that:
Step 1.4) polishing be specially:
First with 100# or 200# model flint paper buffing work-piece surface to local fiber exposure, then use 1000#, 1500# and 2000# model fine sandpaper buffing work-piece surface to smooth respectively, without defects such as pit, projection, holes.
9. the preparation method of the ceramic matric composite densification according to right 1, is characterized in that:
Step 1.5) surface carbonation silicon coating deposition be specially:
Be incubated 4 ~ 6 hours after first workpiece being warmed up to 1000 ~ 1200 DEG C, and then pass into reactant gases and carry out surface carbonation silicon coating deposition; Cvd furnace is evacuated to 1 ~ 5kPa, using flow be the Ar gas of 4 ~ 10L/min as shielding gas, flow is the H of 4 ~ 10L/min
2gas is as the gas of carrier gas of trichloromethyl silane, and depositing time is 60 ~ 100 hours.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106431498A (en) * | 2016-09-05 | 2017-02-22 | 江苏协鑫特种材料科技有限公司 | Graphite/silicon carbide compact composite material preparation method |
| CN108058264A (en) * | 2017-12-04 | 2018-05-22 | 南充三环电子有限公司 | The dusting technique and system of a kind of ceramic substrate green body |
| CN109942225A (en) * | 2019-03-01 | 2019-06-28 | 蒋留平 | A kind of preparation method of heat resist modification type retarder |
| CN111002483A (en) * | 2019-12-25 | 2020-04-14 | 西安鑫垚陶瓷复合材料有限公司 | Method for machining hole in ceramic matrix composite material member and punching mechanism |
| CN111018568A (en) * | 2019-12-13 | 2020-04-17 | 中国航空制造技术研究院 | Preparation method of ceramic matrix composite surface priming layer |
| CN112495735A (en) * | 2020-11-04 | 2021-03-16 | 西安鑫垚陶瓷复合材料有限公司 | Surface flatness processing method for ceramic matrix composite material satellite light structural part and structural part |
| CN113054178A (en) * | 2021-03-24 | 2021-06-29 | 浙江锂宸新材料科技有限公司 | Polo honey-like silicon-carbon shell-core structure composite negative electrode material and preparation method and application thereof |
| CN114409411A (en) * | 2022-02-15 | 2022-04-29 | 陕西固勤材料技术有限公司 | Surface modification method for reaction sintering silicon carbide product |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106431498A (en) * | 2016-09-05 | 2017-02-22 | 江苏协鑫特种材料科技有限公司 | Graphite/silicon carbide compact composite material preparation method |
| CN106431498B (en) * | 2016-09-05 | 2019-05-28 | 江苏协鑫特种材料科技有限公司 | A method of preparing graphite/carbon SiClx densified composite |
| CN108058264A (en) * | 2017-12-04 | 2018-05-22 | 南充三环电子有限公司 | The dusting technique and system of a kind of ceramic substrate green body |
| CN109942225A (en) * | 2019-03-01 | 2019-06-28 | 蒋留平 | A kind of preparation method of heat resist modification type retarder |
| CN111018568A (en) * | 2019-12-13 | 2020-04-17 | 中国航空制造技术研究院 | Preparation method of ceramic matrix composite surface priming layer |
| CN111002483A (en) * | 2019-12-25 | 2020-04-14 | 西安鑫垚陶瓷复合材料有限公司 | Method for machining hole in ceramic matrix composite material member and punching mechanism |
| CN112495735A (en) * | 2020-11-04 | 2021-03-16 | 西安鑫垚陶瓷复合材料有限公司 | Surface flatness processing method for ceramic matrix composite material satellite light structural part and structural part |
| CN113054178A (en) * | 2021-03-24 | 2021-06-29 | 浙江锂宸新材料科技有限公司 | Polo honey-like silicon-carbon shell-core structure composite negative electrode material and preparation method and application thereof |
| CN113054178B (en) * | 2021-03-24 | 2022-01-11 | 浙江锂宸新材料科技有限公司 | Polo honey-like silicon-carbon shell-core structure composite negative electrode material and preparation method and application thereof |
| CN114409411A (en) * | 2022-02-15 | 2022-04-29 | 陕西固勤材料技术有限公司 | Surface modification method for reaction sintering silicon carbide product |
| CN114409411B (en) * | 2022-02-15 | 2022-11-18 | 陕西固勤材料技术有限公司 | Surface modification method for reaction sintering silicon carbide product |
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| CN105541415B (en) | 2018-03-13 |
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