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采用碳纤维二维针织布片与SiC轧膜素坯片交替叠层,通过排胶和热压烧结工艺,成功地制备出CF/SiC层状复合材料,研究了烧结助剂体系、烧结温度及保温时间等烧结工艺对CF/SiC层状复合材料断口形貌及断裂行为的影响。结果表明:选择Al2O3、Y2O3及Si粉作为烧结助剂,烧结制度为1900℃/1.5h工艺条件下,材料易致密、不分层,CF/SiC层状复合材料的综合力学性能最佳;CF/SiC层状复合材料的主要增韧机制为裂纹在纤维布层内的多次横向偏转及纤维束与单根纤维的脱粘、断裂与拔出。
Two-dimensional carbon fiber knitted fabric sheets were alternately laminated with the SiC film-forming elemental green sheets, and the CF / SiC layered composite materials were successfully prepared by the process of de-gluing and hot-pressing sintering. The sintering aid system, sintering temperature and thermal insulation Time and other sintering process on the fracture morphology and fracture behavior of CF / SiC layered composites. The results show that the mechanical properties of CF / SiC layered composites are the best when the sintering temperature is 1900 ℃ / 1.5h with Al2O3, Y2O3 and Si powders as the sintering aids. The main toughening mechanism of the / SiC composite is the multiple transverse deflection of the crack in the fiber cloth layer and the debonding, breaking and pulling out of the fiber bundle and the single fiber.