TiB_2-B_4C陶瓷复合材料的微观组织和机械性能

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF TiB_2-B_4C CERAMIC COMPOSITES

研究了TiB_2/B_4C复合材料的显微组织和力学性能,发现含有20-30wt-％B_4C的TiB_2材料,强度和硬度均有显著地提高,而原有较高的K_(IC)值保持不变。TiB_2-30wt-％B_4C抗弯强度达到782MPa,维氏硬度达到26.2GPa,断裂韧性为7.2MPam^(1/2);而单相TiB_2材料的强度、硬度和断裂韧性分别为450MPa,21GPa和7.0MPam^(1/2)。本文还对强化及裂纹扩展机理进行了探讨。

The fracture strength and hardness of TiB_2 materials increase by addi- tion of 20--30 wt-% B_4C and the fracture toughness still remains on the original high level. The mechanism of reinforcement and crack propagation have been discussed