A kind of c/sic composite material preparation method
A composite material and resorcinol technology, which is applied in the field of C/SiC composite material preparation, can solve the problems of low reaction activity of matrix carbon and liquid-phase silicon, low densification speed, and potential safety hazards, so as to improve mechanical properties and Anti-ablation performance, improved porosity and pore uniformity, and good overall product performance
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Embodiment 1
[0043] Use resorcinol, formaldehyde and water according to the mass ratio of 6:9:15 and mix evenly for use. Put the carbon fiber preform into a container containing the above solution, vacuum impregnate it, and keep it for 1 hour. After curing at 180°C, after natural cooling, the preform was taken out for high temperature cracking at 800°C, and the above impregnation-curing-cracking process was repeated 5 times, and finally the density of 1.30g / cm3 was prepared. 3 Low-density C / C porous body material. Embed the low-density C / C composite material into silicon powder, heat it to 1450°C for 30 minutes under vacuum, then raise it to 1700°C within 1 hour, and keep it for 60 minutes to prepare a C / SiC composite material with a density of 2.0 g / cm 3 , The bending strength is 260MPa.
Embodiment 2
[0045] Use resorcinol, formaldehyde, and water according to the mass ratio of 5:9:40, mix well and set aside. Put the carbon fiber preform into a container containing the above solution, vacuum impregnate it, and keep it for 1 hour. After being cured at 180°C, the preform was taken out for high temperature cracking at 800°C, and the above impregnation-curing-cracking process was repeated 7 times, and finally a density of 1.31g / cm3 was prepared. 3 Low-density C / C porous body material. Embed the low-density C / C composite material into silicon powder, heat it to 1450°C for 30 minutes under vacuum, then raise it to 1700°C within 1 hour, and keep it for 60 minutes to prepare a C / SiC composite material with a density of 2.1 g / cm 3 , The bending strength is 272MPa.
Embodiment 3
[0047] Use resorcinol, formaldehyde and water according to the mass ratio of 5:9:15 and mix evenly for use. Put the carbon fiber preform into a container containing the above solution, vacuum impregnate it, and keep it for 1 hour. After curing at 180°C, the preform was taken out and subjected to high temperature cracking at 800°C, and the above impregnation-curing-cracking process was repeated 6 times, and finally a density of 1.35g / cm3 was prepared. 3 Low-density C / C porous body material. Embed the low-density C / C composite material into silicon powder, heat it to 1450°C for 30 minutes under vacuum, then raise it to 1700°C within 1 hour, and keep it for 60 minutes to prepare a C / SiC composite material with a density of 2.3 g / cm 3 , The bending strength is 265MPa.
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