Method for preparing C/C-SiC composite part and product prepared through method

A technology for composite materials and parts, which is applied in the field of preparation of C/C-SiC composite parts, can solve the problems of near-net-shape residual silicon and uneven powder preparation of complex parts, achieve small dimensional changes, and reduce production costs and time. , the effect of high comprehensive performance

Active Publication Date: 2017-07-07
HUAZHONG UNIV OF SCI & TECH
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  • Description
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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for preparing C / C-SiC composite parts and its products, in which carbon fiber composite powder is prepared by using solvent evaporation method, 3D printing technology and two times of augmentation The combination of dense processing can solve the technical problems of uneven powder preparation, near-net shape of complex parts and residual silicon in parts

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  • Method for preparing C/C-SiC composite part and product prepared through method

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preparation example Construction

[0027] figure 1 It is a flow chart of the preparation method constructed according to the preferred embodiment of the present invention, such as figure 1 Shown, a kind of preparation method of C / C-SiC composite material part and its product, comprise the following steps:

[0028] (a) Utilize the solvent evaporation method to prepare carbon fiber / phenolic resin composite powder, the specific preparation steps are as follows:

[0029] (a1) Completely dissolving thermoplastic phenolic resin containing 7-10wt.% urotropine in acetone solvent to form a solution, wherein the mass ratio of resin to solvent is 1:1;

[0030] (a2) Adding carbon fiber powder to the above solution, and uniformly dispersing the carbon fiber powder by ultrasound, wherein the volume ratio of carbon fiber powder to phenolic resin is (2~8):(2~8);

[0031] (a3) Distilling by heating and recovering the solvent to obtain powder aggregates;

[0032] (a4) After drying, grinding and sieving, a carbon fiber composi...

Embodiment 1

[0049] (a) 1000g of thermoplastic phenolic resin containing 7wt.% urotropine is completely dissolved in 1000g of acetone solution; 5770g of short carbon fiber powders with a length of 50 to 200 microns are added to the above solution, and the carbon fiber powder is evenly dispersed by ultrasound Then by heating and distilling and reclaiming the solvent, powder aggregates are obtained; after drying, grinding and sieving, the carbon fiber composite powder with an average particle size of phenolic resin uniform coating at 10 to 80 microns is obtained, wherein the volume percentage of phenolic resin is 20%.

[0050] (b) According to the CAD model of the designed part, the corresponding carbon fiber initial blank is formed by 3DP technology. The process parameters of the 3DP are as follows: the adhesive is composed of 70% absolute ethanol by mass fraction, 28% deionized water and 2% polyethylene glycol 400, the thickness of the powder layer is 0.1 mm, and the number of scans is 1. ...

Embodiment 2

[0054] (a) 1000g of thermoplastic phenolic resin containing 8wt.% urotropine is completely dissolved in 1000g of acetone solution; 3366g of short carbon fiber powders with a length of 50 to 200 microns are added to the above solution, and the carbon fiber powder is evenly dispersed by ultrasound Then by heating and distilling and reclaiming the solvent, powder aggregates are obtained; after drying, grinding and sieving, the carbon fiber composite powder with an average particle size of phenolic resin uniform coating is obtained at 10 to 100 microns, wherein the volume percentage of phenolic resin is 30%.

[0055] (b) According to the CAD model of the designed part, the corresponding carbon fiber initial blank is formed by 3DP technology. The process parameters of the 3DP are as follows: the adhesive is composed of 75% absolute ethanol by mass fraction, 23% deionized water and 2% polyethylene glycol 400, the thickness of the powder layer is 0.1 mm, and the number of scans is 1....

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Abstract

The invention belongs to the field of composites, and discloses a method for preparing a C/C-SiC composite part and a product prepared through the method. The method comprises the following steps that firstly, carbon fiber/phenolic resin composite powder is prepared by using a solvent evaporation method; secondly, according to a three-dimensional model of the part, the carbon fiber composite powder is molded into an initial molded blank by means of the 3D printing technology; thirdly, the initial molded blank is subjected primary densification and a C/C porous body is obtained; fourthly, the C/C porous body is subjected to a molten silicon infiltration reaction, high-temperature desilication and secondary densificaiton, and the final C/C-SiC part is obtained. By means of the method, the C/C-SiC composite part with a complex structure can be shaped in a near-net mode, the method is short in production period and low in cost, and the C/C-SiC composite part obtained through the method is low in residual silicon content and has excellent performance.

Description

technical field [0001] The invention belongs to the field of composite materials, and more specifically relates to a preparation method of a C / C-SiC composite material part and a product thereof. Background technique [0002] C / C-SiC composite material is a kind of composite material with carbon fiber as reinforcement and carbon and silicon carbide as matrix. It has low density, high strength, high temperature resistance, chemical corrosion resistance, high friction coefficient, low wear rate, and It has many advantages such as good thermal decay performance, and can be used as high-temperature structural materials, thermal protection materials, and brake materials in aerospace, energy, transportation and other fields. Such as rocket engine throat linings, nozzles and combustion chambers, heat exchangers for nuclear hydrogen production, brake discs for aircraft and high-speed trains, etc. [0003] The structural forms of carbon fiber reinforcements in C / C-SiC composites mai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/83C04B35/565C04B35/622
CPCC04B35/806C04B35/565C04B35/622C04B35/83C04B2235/428C04B2235/5248C04B2235/616C04B2235/6026C04B35/573C04B2235/422C04B2235/526C04B2235/5264C04B2235/614C04B35/62873C04B35/62886C04B2235/48C04B2235/6581C04B2235/6562C04B2235/6567B33Y10/00B33Y80/00C04B35/80C04B35/62281C04B2235/3826C04B2235/5252C04B2235/77C04B35/515
Inventor 闫春泽朱伟傅华徐中凤史玉升
Owner HUAZHONG UNIV OF SCI & TECH
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