Preparation method of SiC/SiC composite material
A composite material and prefabricated technology, which is applied in the preparation of SiC/SiC composite materials and the preparation of high-density SiC/SiC composite materials, can solve the problems of small ceramic retention rate, high porosity of SiC/SiC composite materials, and manufacturing cycle. Long and other problems, to achieve the effect of reducing porosity, increasing the degree of cross-linking, and high ceramic yield
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[0021] 1. Preparation of fiber preform: using 2.5D weaving process, SiC fibers are woven into SiC fiber preform, the thickness of the fiber preform is 2-5mm, and the volume fraction is 35%-50%;
[0022] 2RTM mold preparation: According to the shape of the SiC fiber preform, a mold for RTM process is designed, and graphite paper with a thickness of 0.10~0.50mm is placed on the bonding surface of the upper and lower molds of the mold;
[0023] 3RTM process vacuum injection: high-temperature pre-treatment of the fiber preform to remove the sizing agent and other impurities on the surface of the fiber. The high-temperature pre-treatment temperature is 800 ℃, and the treatment time is 0.5 to 1 hour, and then the SiC fiber preform is placed In the RTM mold, close the mold, lock the mold, and vacuum until the internal pressure of the RTM mold is ≤0.005MPa, inject the liquid polycarbosilane into the mold, and vacuum while injecting;
[0024] 4 Heating and curing: Place the RTM mold on which ...
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[0029] Example one
[0030] 1. Preparation of fiber preform: Using Cansas 3203SiC fiber as raw material, using 2.5D weaving process, Cansas3203SiC fiber is woven into SiC fiber preform, the thickness of the fiber preform is 3mm, and the volume fraction is 40%.
[0031] 2. RTM mold preparation: According to the shape of the SiC fiber preform, the mold used for the RTM process is designed, and graphite paper with a thickness of 0.20mm is placed on the bonding surface of the upper and lower molds of the mold;
[0032] 3. RTM process vacuum glue injection: high-temperature pre-treatment of the fiber preform to remove the sizing agent and other impurities on the surface of the fiber. The high-temperature pre-treatment temperature is 800 ℃, the treatment time is 0.5 hours, and then the SiC fiber preform is placed In the RTM mold, close the mold, lock the mold, and vacuum until the internal pressure of the RTM mold is ≤0.005MPa, inject the liquid polycarbosilane into the mold, and vacuum wh...
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[0038] Example two
[0039] 1. Design and preparation of fiber preform: KD-II SiC fiber is used as raw material and 2.5D weaving process is used to weave SiC fibers into SiC fiber preform. The thickness of the fiber preform is 2.5mm and the volume fraction is 44%.
[0040] 2. RTM mold preparation: design a mold for RTM process according to the shape of the SiC fiber preform, and place graphite paper with a thickness of 0.30mm on the bonding surfaces of the upper and lower molds of the mold;
[0041] 3. RTM process vacuum glue injection: high-temperature pre-treatment of the fiber preform to remove the sizing agent and other impurities on the surface of the fiber. The high-temperature pretreatment temperature is 800 ℃, the treatment time is 1 hour, and then the SiC fiber preform is placed In the RTM mold, close the mold, lock the mold, and vacuum until the internal pressure of the RTM mold is ≤0.005MPa, inject the liquid polycarbosilane into the mold, and vacuum while injecting;
[004...
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