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无机材料学报

无机材料学报

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一种新的MoSi2基复合材料显微结构及其对力学性能的影响

李建林; 江东亮; 谭寿洪   

  1. 中国科学院上海硅酸盐研究所高性能陶瓷及超微结构国家重点实验室, 上海 200050
  • 收稿日期:1999-02-03 修回日期:1999-03-15 出版日期:2000-02-20 网络出版日期:2000-02-20

A Novel Microstructure and Its Effects on Mechanical Properties of TiC/TiB2/MoSi_2 Composites

LI Jian-Lin; JIANG Dong-Liang; TAN Shou-Hong   

  1. State Key Lab of High Performance Ceramics and Superfine Microstructure; Shanghai institute ofCeramics; Chinese Academy of Sciences; Shanghai 200050; China
  • Received:1999-02-03 Revised:1999-03-15 Published:2000-02-20 Online:2000-02-20

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摘要： 本文研究了原位生成的ＴｉＣ／ＴｉＢ２／ＭｏＳｉ２三相复合材料的一种新的显微结构及其对力学性能的影响，结果表明，当热压金属Ｔｉ,Ｂ４Ｃ和ＭｏＳｉ２的混合粉末时，在ＭｏＳｉ２的基体内生成由ＴｉＣ和ＴｉＢ２组成的空心粒子．其中的ＴｉＣ和ＴｉＢ２粒子均为纳米粒子．具有此新显微结构的复合材料，强度达到４８０ＭＰａ，断裂韧性为５．２ＭＰａ·ｍ１／２，较单相ＭｏＳｉ２材料的力学性能有大幅度提高．

关键词: 显微结构, 力学性能, 二硅化相

Abstract: A novel microstructure of TiC /TiB2 / MoSi2 composite and its effect on mechanicalproperties were studied. The results indicate that hollow particles, consisting of TiC and TiB2 nanosized grains, can be formed in MoSi2 matrix when the mixed powder of elemental Ti, B4C and MoSi2 was reactively hot pressed. The bending strength of these composites with the newmicrostructure reaches at 480 MPa, and the highest fracture toughness is 5.2 Mpa·ml/2.

Key words: microstructure, mechanical properties, molybdenum disiliside

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