摘要
采用等离子活化烧结法制备Ta-2Ti-xTiC(x=0、0.5、1.0、2.0和4.0,质量分数,%)复合材料,研究TiC对复合材料微观结构和力学性能的影响。结果表明,随TiC含量增加,复合材料的致密度先升高后降低,Ta-2Ti-0.5TiC的致密度达到最高值99.5%。加入TiC可抑制晶粒生长,晶粒尺寸随TiC含量增加而减小,TiC质量分数为4.0%时,晶粒尺寸减小至2.98μm。TiC在高温下发生脱碳反应,生成的C与Ta反应原位生成高硬度的Ta_(2)C陶瓷相,起到桥接基体晶粒与阻碍裂纹扩展的作用。随Si C含量增加,Ta-2Ti-TiC复合材料的硬度和抗磨强度提高,这得益于晶粒细化与原位生成的Ta2C高硬度陶瓷相。
Ta-2Ti-xTiC (x=0,0.5,1.0,2.0 and 4.0,mass fraction,%) composites were prepared by plasma activated sintering method.The effects of TiC on the microstructure and mechanical properties of the composites were studied.The results show that with the increase of TiC content,the relative density of the composites increases first and then decreases and the relative density of Ta-2Ti-0.5TiC reaches the highest value of 99.5%.The addition of TiC can inhibit the grain growth,and the grain size decreases with the increase of TiC content.When the TiC content is 4.0%,the grain size decreases to 2.98μm.TiC undergoes decarburization reaction at high temperature,and the generated C reacts with Ta to generate high-hardness ceramic phase Ta2C in situ,which plays a role in bridging matrix grains and hindering crack propagation.The mechanical properties of Ta-2Ti-TiC composites improve with increasing TiC content,which is attributed to the benefits from grain refinement and in-situ generation of Ta_(2)C high-hardness ceramic phase.
作者
张建
贾浩
马帅
张诗荃
葛帅
罗国强
沈强
ZHANG Jian;JIA Hao;MA Shuai;ZHANG Shiquan;GE Shuai;LUO Guoqiang;SHEN Qiang(State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China)
出处
《粉末冶金材料科学与工程》
2022年第6期579-585,共7页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金资助项目(51932006)。
