CN116198055A - Preparation method of particle modified carbon fiber composite material needled preform - Google Patents
Preparation method of particle modified carbon fiber composite material needled preform Download PDFInfo
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- CN116198055A CN116198055A CN202310228973.XA CN202310228973A CN116198055A CN 116198055 A CN116198055 A CN 116198055A CN 202310228973 A CN202310228973 A CN 202310228973A CN 116198055 A CN116198055 A CN 116198055A
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- 239000002245 particle Substances 0.000 title claims abstract description 141
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 239000002131 composite material Substances 0.000 title claims abstract description 65
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 239000010410 layer Substances 0.000 claims abstract description 75
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 51
- 239000004917 carbon fiber Substances 0.000 claims abstract description 51
- 239000006185 dispersion Substances 0.000 claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 12
- 238000005520 cutting process Methods 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 238000012986 modification Methods 0.000 claims abstract description 4
- 230000004048 modification Effects 0.000 claims abstract description 4
- 239000002356 single layer Substances 0.000 claims abstract description 4
- 239000004744 fabric Substances 0.000 claims description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 25
- 229910052799 carbon Inorganic materials 0.000 claims description 25
- 150000001875 compounds Chemical class 0.000 claims description 20
- 239000000835 fiber Substances 0.000 claims description 7
- 238000010030 laminating Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 238000009960 carding Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 12
- 238000010923 batch production Methods 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 abstract description 3
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 239000000843 powder Substances 0.000 description 6
- 238000002679 ablation Methods 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 229910052582 BN Inorganic materials 0.000 description 4
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000001764 infiltration Methods 0.000 description 3
- 230000008595 infiltration Effects 0.000 description 3
- 239000011229 interlayer Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000009954 braiding Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052755 nonmetal Inorganic materials 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B15/00—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00
- B29B15/08—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00 of reinforcements or fillers
Abstract
The invention belongs to the technical field of preparation of carbon fiber composite material preforms, and particularly relates to a preparation method of a particle modified carbon fiber composite material needled preform, which comprises the following steps: preparing a particle dispersion liquid; preparing a particle composite carbon fiber net tire; uniformly introducing the particle dispersion liquid into a thin layer net to form a particle composite carbon fiber net tire with certain surface density; performing particle modification unit layer forming according to the particle composite carbon fiber net tire; cutting to obtain the size of the particle modified unit layer; laying the particle modified single layers layer by layer according to a preset layer number, sequentially needling, and repeatedly circulating to form a quasi-three-dimensional preform containing particles and carbon fibers; according to the product requirement, the quasi-three-dimensional preform is cut into a required shape, so that the uniformity of the distribution of modified particles in the material can be effectively improved, the process is simple, the cost is low, the environmental pollution is small, the production period is greatly shortened, and the industrial batch production is facilitated.
Description
Technical Field
The invention belongs to the technical field of preparation of carbon fiber composite material preforms, and particularly relates to a preparation method of a particle modified carbon fiber composite material needled preform.
Background
The carbon fiber composite material has the advantages of low density, high strength, high specific heat capacity, high melting point, corrosion resistance and the like, and is widely applied to the fields of aerospace, rail transit, new energy equipment, engineering machinery, medical treatment, chemical industry and the like. With the continuous deepening and development of the application field of the carbon fiber composite material, higher requirements are put forward on performance indexes of the material such as mechanical properties, friction and wear properties, oxidation and ablation resistance and the like.
At present, the performance and application value of the carbon fiber composite material are improved mainly by a matrix modification method at home and abroad, and modified particles such as ceramic powder, metal or metal compounds are introduced into the carbon fiber composite material by adopting processes such as chemical vapor infiltration, reaction infiltration, inorganic salt solution infiltration, organic precursor impregnation pyrolysis and the like. The performance of the carbon fiber composite material can be improved through the reinforcing effect of the modified particles, but in the preparation process of the background technology disclosed above, the modified particles permeate unevenly inside and outside the carbon fiber preform and the composite material, so that the performance stability of the material is poor, and the preparation process is complex in process, high in cost, long in production period and unfavorable for industrial batch production.
The patent application number CN201210293979.7 is to compound ceramic powder into a carbon fiber net tire through a manual or mechanical broadcasting method, and to perform carbon fiber three-dimensional fine braiding in the vertical direction after overlapping and layering with carbon fiber cloth at intervals to prepare a carbon fiber net tire compound ceramic powder three-dimensional fine braiding preform. The method can improve the high temperature strength and corrosion resistance of the prefabricated body, but the ceramic dust has great environmental pollution in the manual or mechanical broadcasting process, and the dried ceramic powder is accumulated on the surface of the net tire layer, and the uniformity of the distribution inside and outside the net tire layer is poor, so that the high temperature characteristic and the stability of the composite material are affected.
Disclosure of Invention
The purpose of the invention is that: the preparation method of the particle modified carbon fiber composite material needled preform solves the problems of long production period, high cost, insufficient material performance stability and the like in the prior art, can effectively improve the uniformity of the distribution of modified particles in the material, has simple process, low cost and little environmental pollution, greatly shortens the production period, and is beneficial to industrialized batch production.
The technical scheme of the invention is as follows:
a particle modified carbon fiber composite needled preform and a preparation method thereof comprise the following steps:
step 1, preparing particle dispersion liquid;
step 3, forming a particle modification unit layer according to the particle composite carbon fiber net tire;
step 4, cutting the particle modified unit layer obtained in the step 3 to obtain the size of the particle modified unit layer;
step 5, laying the particle modified single layers layer by layer according to the preset layer number, sequentially needling, and repeatedly circulating to form a quasi-three-dimensional preform containing particles and carbon fibers;
and 6, cutting the quasi-three-dimensional preform into a required shape according to the product requirement.
The technical scheme of the invention is characterized in that:
in the step 1, the particles are metal Cu compound, AL compound, ti compound, non-metal C compound, si compound or B compound, the particle diameter is 10 nm-1 um, the mass fraction of the particles in the particle dispersion liquid is 0-35%, and one or more mixed particles are contained.
In the step 2, the tread density of the lamellar net is 5-18 g/m 2 。
The step 3 is specifically as follows: needling the particle composite carbon fiber net tire to form a full net tire structure, or needling the particle composite carbon fiber net tire and carbon cloth to form a net tire/carbon cloth structural unit layer after laminating;
density of needling5 to 15 needles/cm 2 The needling depth is 10-25 mm.
In the step 3, when the particle modified unit layer is of a full-mesh tire structure, the surface density is 5-240 g/m 2 When the particle modified unit layer is of a net tire/carbon cloth structure, the surface density is 85-540 g/m 2 。
In step 5, in the quasi three-dimensional preform: the structural density of the whole net tire is 0.15-0.3 g/cm 3 The structural density of the net tyre/carbon cloth is 0.40-0.75 g/cm 3 。
In the step 2, the particle introducing mode is that the particle dispersion liquid is sprayed into the thin layer net through manpower or equipment uniformly between the continuous operation air-laid net and the lapping, a solution receiving tank is arranged below the spraying area, and the mass fraction of the particles in the particle composite carbon fiber net is 0-30%.
In the step 3, the carbon cloth is compounded with the same modified particles, and the mass fraction of the particles is 0-20%.
According to the particle modified carbon fiber composite material needled preform and the preparation method thereof, the number of layers of the modified particle-containing net tire in unit thickness is greatly increased by preparing the thin-layer net tire, so that particles are distributed more uniformly in the surface and between layers of the carbon fiber composite material, and the stability of the material performance is greatly improved. The modified particles are introduced into the carbon fiber thin layer net tyre in a dispersion liquid spraying mode between continuous operation air-laying and lapping. The particle composite net tire is repeatedly laminated or is needled with carbon cloth to form a carbon fiber composite material needled preform containing modified particles, and the performances of high temperature resistance, oxidation ablation resistance and the like of the preform and the carbon fiber composite material can be improved through the reinforcing effect of the modified particles in the layer. In addition, the composition and the content of the modified particles can be controlled through process design, the designability of the material performance is strong, and the optimization of the material performance and the expansion of the application field are facilitated. The particle modified carbon fiber composite material prepared by the method has uniform quality, high temperature resistance, wear resistance, oxidation and ablation resistance and good stability.
Drawings
FIG. 1 is a schematic cross-sectional view of a full-mesh tire structure preform of the present invention;
FIG. 2 is a schematic cross-sectional view of a net tire/carbon cloth structure preform according to the present invention;
FIG. 3 is a schematic view of the preparation process of the particle composite carbon fiber mesh tire in particle examples 1 and 2;
in the figure: 1. longitudinal fibers; 2. particle modified carbon fiber mesh; 3. a carbon cloth; 4. a thin layer net tyre; 5. a particle dispersion; 6. a solution receiving tank; 7. and (3) a particle composite carbon fiber net tire.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings.
The technical scheme of the invention is as follows: the preparation method of the particle modified carbon fiber composite material needled preform comprises the steps of preparing a particle composite carbon fiber net tire from particle dispersion liquid and a carbon fiber thin layer net tire, wherein particle components in the particle dispersion liquid are single-component or multi-component metal or nonmetal particles, the particle composite net tire is repeatedly laminated or needled with carbon cloth to form a particle composite unit layer, the unit layers are paved according to 1.x+1.y and 0/90 degrees, the particle modified unit layers are continuously needled layer by layer, the particle modified carbon fiber quasi-three-dimensional structure preform is paved layer by layer, and the needled preform is circularly needled, so that the particle modified carbon fiber composite material needled preform is obtained.
As shown in fig. 3, the embodiment of the invention provides a particle modified carbon fiber composite material needled preform and a preparation method thereof, comprising the following steps:
step 1, preparing particle dispersion liquid, designing components, proportion and configuration method of the particle dispersion liquid based on product performance and customer requirements, and preparing single-component or multi-component particle dispersion liquid.
And 2, preparing a particle composite carbon fiber net tire, preparing a thin layer net tire from chopped fibers through air flow carding, uniformly introducing the particle dispersion liquid prepared in the step 1 into the thin layer net tire according to a set introduction amount, and repeatedly laminating through a lapping device to form the particle composite carbon fiber net tire with certain surface density.
Step 3, forming a particle modified unit layer, namely, needling a particle composite carbon fiber net tire layer by layer or needling after lamination with carbon cloth to form a whole net tire structure (shown in figure 1) or a net tire/carbon cloth structure (shown in figure 2) unit layer, wherein the needling density is 5-15 needles/cm 2 The needling depth is 10-25 mm.
And 4, cutting to obtain the required particle modification unit layer size.
And 5, paving the particle modified single layers layer by layer according to the preset layer number, sequentially needling, and repeatedly circulating to form the quasi-three-dimensional preform containing particles and carbon fibers.
And 6, cutting, namely cutting the needled preform into a required shape according to the product requirement.
Preferably, in step 1, the particles are metallic Cu compounds, AL compounds, ti compounds, nonmetallic C compounds, si compounds, B compounds, etc., the particle diameter is 10 nm-1 um, the mass fraction of the particles in the particle dispersion is 0-35%, and one or more mixed particles are contained.
Preferably, in step 2, the sheet mesh tread density is from 5 to 18g/m 2 The fiber specification is 3K, 6K, 12K, 24K, 48K or 50K.
Preferably, in step 3, the particle modifying unit layer; the structural surface density of the full-mesh tire is 5-240 g/m 2 The surface density of the net tire/carbon cloth structure is 85-540 g/m 2 。
Preferably, in step 5, the quasi-three-dimensional preform; the structural density of the whole net tire is 0.15-0.3 g/cm 3 The structural density of the net tyre/carbon cloth is 0.40-0.75 g/cm 3 。
Preferably, in the step 2, the particle introducing mode is that the particle dispersion liquid is sprayed into the thin layer net through manpower or equipment uniformly between continuous operation air-laying and lapping, a solution receiving tank is arranged below a spraying area, and the mass fraction of particles in the particle composite carbon fiber net is 0-30%.
Preferably, in the step 3, the carbon cloth is compounded with the same modified particles, and the mass fraction of the particles is 0-20%.
Example 1:
silicon carbide powder and copper powder with the specification of 200nm are adopted, the mass ratio is 1:1, and the dispersion solvent is used for preparing 30% silicon carbide and copper mixed particle dispersion liquid. 12k carbon fiber is made into a fiber with the surface density of 10g/m by air-laying 2 And uniformly introducing the mixed particle dispersion liquid into the thin layer net tire according to the mass ratio of the particles to the thin layer net tire of 1:5, and repeatedly laying 10 layers by using a lapping device to prepare the particle composite carbon fiber net tire. Setting the needling density to 7 needles/cm 2 The needling depth is 14mm, and the particle composite net tire is needled to form the surface density of 120g/m 2 The whole-net-tire structural particle modified unit layer is cut into a square with 210 multiplied by 210 mm. Needling the cut unit layer with needling depth of 21mm and needling density of 16 needles/cm 2 Sequentially laying, and circularly needling until the design requirement is met. The size of the full-mesh tire structure preform is 200 multiplied by 15mm, and the volume density is 0.216g/cm 3 The interlayer density is 18 layers/10 mm, and the mass fraction of the silicon carbide powder and the copper powder is 16.67%.
Example 2:
the mass fraction of the dispersion liquid of the boron nitride particles is 20% by adopting the boron nitride powder with the specification of 100nm and a dispersion solvent. 6k carbon fiber is made into a fiber with the surface density of 15g/m by air-laying 2 Uniformly introducing the boron nitride particle dispersion liquid into the thin layer net tire according to the mass ratio of the particles to the thin layer net tire of 1:10, repeatedly laying 12 layers by using a lapping device to prepare a particle composite carbon fiber net tire, and introducing the particle dispersion liquid into a film of 200g/m according to the same proportion 2 In the carbon cloth, the density is 220g/m 2 And (5) compositing the particles with carbon cloth. Setting the needling density to 10 needles/cm 2 The needling depth is 20mm, the particle composite carbon fiber net tire and the carbon cloth are laminated, and needling is carried out to form the surface density of 418g/m 2 The mesh tire/carbon cloth structure particle modified unit layer is cut into a square with the length of 510 multiplied by 510 mm. Needling the cut unit layer to a needling depth of 20mm and a needling density of 22 needles/cm 2 Sequentially laying, and circularly needling until the design requirement is met. The net tire/carbon cloth structure prefabricated body has the size of 500 multiplied by 30mm and the volume density of 0.502g/cm 3 The interlayer density is 12 layers/10 mm, and the mass fraction of the boron nitride powder is 10%.
Compared with the prior art, the preparation method of the particle modified carbon fiber composite material needled preform has the advantages that the number of layers of the modified particle net tire in unit thickness is greatly increased by utilizing the preparation of the thin layer net tire, so that the particles are distributed more uniformly in the surface and the interlayer of the carbon fiber composite material, and the stability of the material performance is greatly improved. The modified particles are introduced into the carbon fiber thin layer net tyre in a dispersion liquid spraying mode between continuous operation air-laying and lapping. The particle composite net tire is repeatedly laminated or is needled with carbon cloth to form a carbon fiber composite material needled preform containing modified particles, and the performances of high temperature resistance, oxidation ablation resistance and the like of the preform and the carbon fiber composite material can be improved through the reinforcing effect of the modified particles in the layer. In addition, the composition and the content of the modified particles can be controlled through process design, the designability of the material performance is strong, and the optimization of the material performance and the expansion of the application field are facilitated. The particle modified carbon fiber composite material prepared by the method has the advantages of uniform quality, high temperature resistance, wear resistance, oxidation and ablation resistance, good stability and the like.
Claims (8)
1. The particle modified carbon fiber composite material needled preform and the preparation method thereof are characterized by comprising the following steps:
step 1, preparing particle dispersion liquid;
step 2, preparing a particle composite carbon fiber net tire; preparing a thin layer net tyre from chopped fibers through air flow carding, uniformly introducing the particle dispersion liquid prepared in the step 1 into the thin layer net tyre according to a set introduction amount, and repeatedly laminating through a lapping device to form a particle composite carbon fiber net tyre with a certain surface density;
step 3, forming a particle modification unit layer according to the particle composite carbon fiber net tire;
step 4, cutting the particle modified unit layer obtained in the step 3 to obtain the size of the particle modified unit layer;
step 5, laying the particle modified single layers layer by layer according to the preset layer number, sequentially needling, and repeatedly circulating to form a quasi-three-dimensional preform containing particles and carbon fibers;
and 6, cutting the quasi-three-dimensional preform into a required shape according to the product requirement.
2. The particle-modified carbon fiber composite needled preform and the production method thereof according to claim 1, wherein in the step 1, the particles are metallic Cu compound, AL compound, ti compound, nonmetallic C compound, si compound or B compound, the particle diameter is 10nm to 1 μm, the mass fraction of the particles in the particle dispersion is 0 to 35%, and one or more kinds of mixed particles are contained.
3. The particle-modified carbon fiber composite needled preform and the preparation method thereof as claimed in claim 1, wherein in step 2, the tread density of the thin layer mesh is 5-18 g/m 2 。
4. The particle-modified carbon fiber composite needled preform and the preparation method thereof as claimed in claim 1, wherein the step 3 is specifically: needling the particle composite carbon fiber net tire to form a full net tire structure, or needling the particle composite carbon fiber net tire and carbon cloth to form a net tire/carbon cloth structural unit layer after laminating;
needling density is 5-15 needles/cm 2 The needling depth is 10-25 mm.
5. The particle-modified carbon fiber composite needled preform and the preparation method thereof as claimed in claim 1, wherein in step 3, when the particle-modified unit layer is of a full mesh structure, the areal density is 5 to 240g/m 2 When the particle modified unit layer is of a net tire/carbon cloth structure, the surface density is 85-540 g/m 2 。
6. A particle-modified carbon fiber composite as defined in claim 1The material needling preform and the preparation method thereof are characterized in that in the step 5, the quasi three-dimensional preform comprises: the structural density of the whole net tire is 0.15-0.3 g/cm 3 The structural density of the net tyre/carbon cloth is 0.40-0.75 g/cm 3 。
7. The particle-modified carbon fiber composite needled preform and the preparation method thereof according to claim 1, wherein in the step 2, the particle introducing mode is that particle dispersion liquid is uniformly sprayed into a thin layer net through manpower or equipment between continuous operation air-laying and lapping, a solution receiving tank is arranged below a spraying area, and the mass fraction of particles in the particle-modified carbon fiber net is 0-30%.
8. The particle-modified carbon fiber composite needled preform and the preparation method thereof as claimed in claim 4, wherein in the step 3, the carbon cloth is compounded with the same modified particles, and the mass fraction of the particles is 0-20%.
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|---|---|---|---|---|
| US4790052A (en) * | 1983-12-28 | 1988-12-13 | Societe Europeenne De Propulsion | Process for manufacturing homogeneously needled three-dimensional structures of fibrous material |
| CN101195899A (en) * | 2007-10-22 | 2008-06-11 | 湖南博云高科技有限公司 | Composite material of carbon/carbon/copper and production technology thereof |
| WO2014180159A1 (en) * | 2013-05-07 | 2014-11-13 | 江苏天鸟高新技术股份有限公司 | Annular fibre preform and method of preparing same |
| CN104446589A (en) * | 2014-12-24 | 2015-03-25 | 中南大学 | Method for preparing whisker modified carbon/carbon composite material |
| CN112500184A (en) * | 2020-12-17 | 2021-03-16 | 中南大学 | Aluminum oxide doped modified carbon-based composite material and preparation method thereof |
| CN112608163A (en) * | 2020-12-17 | 2021-04-06 | 中南大学 | Barium titanate doped modified carbon-based composite material and preparation method thereof |
| CN114801353A (en) * | 2022-03-31 | 2022-07-29 | 西安航空制动科技有限公司 | Pre-oxidized fiber/carbon fiber structure preform and preparation method thereof |
-
2023
- 2023-03-10 CN CN202310228973.XA patent/CN116198055A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4790052A (en) * | 1983-12-28 | 1988-12-13 | Societe Europeenne De Propulsion | Process for manufacturing homogeneously needled three-dimensional structures of fibrous material |
| CN101195899A (en) * | 2007-10-22 | 2008-06-11 | 湖南博云高科技有限公司 | Composite material of carbon/carbon/copper and production technology thereof |
| WO2014180159A1 (en) * | 2013-05-07 | 2014-11-13 | 江苏天鸟高新技术股份有限公司 | Annular fibre preform and method of preparing same |
| CN104446589A (en) * | 2014-12-24 | 2015-03-25 | 中南大学 | Method for preparing whisker modified carbon/carbon composite material |
| CN112500184A (en) * | 2020-12-17 | 2021-03-16 | 中南大学 | Aluminum oxide doped modified carbon-based composite material and preparation method thereof |
| CN112608163A (en) * | 2020-12-17 | 2021-04-06 | 中南大学 | Barium titanate doped modified carbon-based composite material and preparation method thereof |
| CN114801353A (en) * | 2022-03-31 | 2022-07-29 | 西安航空制动科技有限公司 | Pre-oxidized fiber/carbon fiber structure preform and preparation method thereof |
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