B_4C/Al_2O_3/TiC复合陶瓷的力学性能和微观结构  

Microstructures and Mechanical Properties of B_4C/Al_2O_3/TiC Composite

作　　者：孙军龙[1] 刘长霞[1] 何士龙[1] 

机构地区：[1]鲁东大学交通学院,山东烟台264025

出　　处：《材料工程》2008年第7期27-29,共3页Journal of Materials Engineering

基　　金：鲁东大学人才引进基金(LY20074302)和(LY20074303)

摘　　要：利用热压烧结工艺成功制备了B4C/Al2O3/TiC复合陶瓷。探讨了TiC含量对B4C/Al2O3/TiC复合陶瓷力学性能和显微结构的影响,并研究了B4C/Al2O3/TiC复合陶瓷的增韧机制。结果表明,在烧结过程中B4C与TiC发生原位反应,生成了TiB2。发生原位反应有效的降低了B4C/Al2O3复合陶瓷的致密化烧结温度;B4C/Al2O3复合陶瓷烧结温度为2150℃,B4C/Al2O3/TiC复合陶瓷的烧结温度为1900℃。而且,原位反应提高了B4C/Al2O3/TiC复合陶瓷相对密度和力学性能。裂纹偏转和裂纹钉扎是B4C/Al2O3/TiC复合材料主要增韧机制。B4C/Al2O3/TiC composites were prepared by hot pressing with different content of Al2O3 and TiC as additives. The effect of TiC content on microstructures and mechanical properties of the composites has been studied. The toughening mechanisms of B4C/Al2O3/TiC composites are discussed. The experiment results showed that TiB2 formed by the in-situ reaction between B4C and TiC during hot pressing, and resulted in a B4C/Al2O3/TiC composite with high relatively density and enhanced mechanical properties compared to B4C/Al2O3 composite. The sintering temperature was lowered from 2150℃ for B4C/Al2O3 composite to 1900℃ for B4C/Al2O3/TiC composite. The toughening mechanisms of B4C/Al2O3/TiC composites are mainly crack deflection and crack pining.

关 键 词：B4C AL2O3 TIC 热压烧结 微观结构 

分 类 号：TQ174[化学工程—陶瓷工业]