原位无压反应烧结制备SiC-MoSi_2复合材料及其性能研究  

Preparation and Characterization of SiC-MoSi_2 Composite Materials by In-situ Pressureless Reaction Sintering

作　　者：许剑光[1] 侯周福[1] 唐果宁[1] 

机构地区：[1]湖南科技大学先进材料制备与应用技术研究所,湖南湘潭411201

出　　处：《矿冶工程》2009年第4期103-106,共4页Mining and Metallurgical Engineering

基　　金：湖南省自然科学基金(07JJ4017);湖南科技大学2008年研究生创新基金项目

摘　　要：利用原位无压反应烧结方法制备了不同配比的SiC/MoSi2复合材料,分析了烧结工艺对产物的影响,研究了原位生成的SiC颗粒对MoSi2基体材料室温力学性能和显微结构的影响。结果表明:原位反应烧结制备SiC/MoSi2的工艺是可行的,反应生成的适量SiC颗粒细化了基体晶粒,改善了其力学性能;与该工艺下制备的纯MoSi2相比,含10%SiC的SiC/MoSi2复合材料室温抗弯强度提高了181%,该复合材料的强化机制为细晶强化和弥散强化,韧化机制为细晶增韧和裂纹偏转。SiC/MoSi2 composites with different volume fraction of SiC particles were prepared by in-situ pressureless reaction sintering and the influence of sintering technique on the product was analysised. The effects of in-situ SiC particles on room temperature mechanical properties and microstructure of MoSi2 basis material were investigated. The results show that the process of preparing SiC/MoSi2 by in-situ reaction sintering is feasible. The matrix grains were refined byappropriate amount SiC particles obtained from reaction and the mechanical properties were improved. Comparing with pure MoSi2 prepared by this process, the flexural strength at room temperature of 10% SiC-containing SiC/MoSi2 composite material increased by 181%. The strengthening mechanism of the composites was fine grain strengthening and dispersion strengthening, and the toughening mechanism was fine grain flexibilization and crack deflection.

关 键 词：SIC/MOSI2复合材料 SIC MOSI2 原位无压反应 力学性能 强化机制 

分 类 号：TF111[冶金工程—冶金物理化学]