摘要
在ＴｉＢ２／ＳｉＣｗ基体中加人适量的ＳｉＣｗ，可以明显地提高其断裂韧性ＫＩＣ．其它机械性能也有不同程度的改善。ＳＥＭ、ＴＥＭ微观分析表明：在具有较高ＮＩＣ值的ＴｉＢ２／ＢｉＣｗ陶瓷复合材料中，ＳｉＣｗ与ＴｉＢ２晶粒之间有较适宜的界面结合，两相之间未发现有明显的界面化学反应，当该复合材料发生断裂时，其内部出现晶须拔出、裂纹桥连、裂纹偏转三种增韧机制。
TiB2/SiCw ceramic composites with different SiCw content were fabricated by hot pressing technique. Substantial improvements in fracture toughness and fie-cural strength was obtained for the composite compared with the pure TiB2 ceramic. Microscopic analysis by SEM, TEM showed that whisker pullout, bridging and crack deflection simultaneously occurred in the composites while broken. So its toughening mechanisms is the complex one consisting of the three mechanisms.
出处
《陶瓷学报》
CAS
1996年第3期4-7,共4页
Journal of Ceramics
基金
国家自然科学基金
关键词
硼化钛
碳化硅
晶须
陶瓷材料
增韧
复合陶瓷
TiB_2
SiC whisker
ceramic composite
toughening mechanism
microscopic analysis
