Preparation method of silicon carbide ceramic-based composite material based on regulation and control of infiltration preform pore structure
A technology of silicon carbide ceramic matrix and composite materials, which is applied in the direction of ceramic products, other household appliances, household appliances, etc., can solve the fiber space obstruction, it is difficult to obtain a uniform pore structure, and it is difficult to obtain silicon carbide ceramic composite materials with low residual silicon and other problems, to achieve the effect of reducing the residual silicon content of the material and improving the overall performance
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Embodiment 1
[0047] An infiltration preform pore structure regulation and preparation method of a silicon carbide ceramic matrix composite material, the specific steps of which are:
[0048] (1) Ball milling the silicon carbide powder, the binder and the solvent to obtain a uniform and stable slurry: the particle size of the silicon carbide powder is 2 μm, and polyvinyl alcohol and ethanol are the binder and the solvent, respectively. The mass ratio of silicon carbide powder, polyvinyl alcohol and ethanol is 30:10:60, the ball milling speed is 90 rpm, and the time is 24 hours;
[0049] (2) Immerse the above slurry into carbon fiber cloth to obtain a fiber impregnated sheet, and the impregnated sheet is cut, dried, pressurized and cured, and subjected to a first pyrolysis treatment to obtain a preform. The thickness of the obtained fiber-impregnated sheet was 0.5 mm. After the fiber-impregnated sheets are laminated (8 layers in total), the curing temperature is 100° C., the curing holding ...
Embodiment 2
[0053] Similar to the steps in Example 1, the difference is: in step (1), the particle size of the silicon carbide powder is 5 μm, and polyvinyl butyral is the binder, wherein the silicon carbide powder, the binder and the The mass ratio of the solvent was 40:10:50. The volume fraction of silicon carbide powder in the obtained infiltration preform is 40 vol%, and the volume fraction of pore-forming carbon in the infiltration preform is 15 vol%.
Embodiment 3
[0055] Similar to the steps in Example 1, the difference is: (1) silicon carbide fiber cloth; (2) the components of the pore-forming slurry are epoxy resin, polyvinylpyrrolidone and ethanol, and the mass ratio is 40:20: 40. The volume fraction of silicon carbide powder in the obtained infiltration preform is 40 vol%, and the volume fraction of pore-forming carbon in the infiltration preform is 10 vol%.
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