【摘要】 在 2 10 0℃ ,30MPa压力下 ,真空烧结 1h制备了碳纤维体积百分数为 2 0 %的TiC陶瓷基复合材料。烧结温度的研究结果表明 :对于TiC复合材料而言 ,2 10 0℃是比较合适的烧结温度。体积百分数 2 0 %碳纤维的加入 ,不但显著提高了TiC陶瓷的室温强度和断裂韧性 ,而且显著提高了其高温强度。复合材料的强韧化机理是纤维的桥联、拔出和裂纹偏转更多还原

【Abstract】 TiC matrix composites reinforced by 20% volume short carbon fiber are prepared by vacuum hot-pressing.The carbon fibers are uniformly distributed in TiC matrix using wet ball-milling mixing.The suitable hot-pressing technique for C f/TiC composites is vacuum hot pressing at 2100℃,30MPa for 1h.The strength of C f/TiC composite is 593MPa at room temperature and 439MPa at 1400℃,and the fracture toughness is 6.87MPa·m 1/2 at room temperature.The strength and fracture toughness of TiC can be increased remarkably by 20% volume carbon fiber addition.The main mechanisms of strengthening and toughening by carbons are fiber bridging and fiber pull-out.Crack deflection has also contribution to toughness.更多还原