刘长霞,孙军龙

• 1:鲁东大学先进制造与自动化技术重点实验室

摘要(Abstract)：

研究了原位反应生成TiB2对B4C/TiB2复合陶瓷维氏硬度、断裂韧度、抗弯强度和微观结构的影响。结果表明,适量TiB2的生成可以抑制B4 C/TiB2复合陶瓷晶粒的长大,可使材料获得均匀致密的显微组织结构;而且原位反应的发生促使B4 C/TiB2复合陶瓷断裂机制由穿晶断裂为主转变为穿晶与沿晶结合的断裂机制。B4 C和TiB2晶粒尺寸都随着原位生成TiB2含量的增加而降低。B4C/TiB2复合陶瓷的抗弯强度随晶粒增大而降低,其断裂韧度随晶粒尺寸的变化关系较为复杂,这种变化关系主要与断裂韧度对裂纹扩展路径长度的依赖性有关,本文利用裂纹扩展阻力(R)曲线的斜率解释了这种变化。

关键词(KeyWords)： B4C;TiB2;原位反应;微观结构

Abstract:

Keywords:

基金项目(Foundation): 鲁东大学人才引进基金(LY20074303,LY20074302)

作者(Author): 刘长霞,孙军龙

DOI: 10.13289/j.issn.1009-6264.2010.07.002

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