TiC含量对无压烧结TiC-Al_(2)O_(3)导电陶瓷复合材料微观结构与性能的影响  

Effect of TiC Content on Microstructure and Properties of Pressureless Sintered TiC-Al_(2)O_(3)Conductive Ceramic Composites

作　　者：张进 黄云涛 岳新艳 张翠萍 茹红强 ZHANG Jin;HUANG Yuntao;YUE Xinyan;ZHANG Cuiping;RU Hongqiang(Key Laboratory for Anisotropy and Texture of Materials,Ministry of Education,School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学材料科学与工程学院,材料各向异性与织构教育部重点实验室,沈阳110819

出　　处：《机械工程材料》2023年第1期70-75,共6页Materials For Mechanical Engineering

基　　金：国家重点研发计划项目(2017YFB0310300);国家自然科学基金资助项目(51772048);辽宁省自然科学基金资助项目(2019-MS-126)。

摘　　要：以Al_(2)O_(3)、TiC粉体为原料,采用无压烧结技术制备了TiC-Al_(2)O_(3)导电陶瓷复合材料,研究了TiC体积分数(30%~45%)对陶瓷复合材料微观结构和性能的影响。结果表明:TiCAl_(2)O_(3)导电陶瓷复合材料主要由Al_(2)O_(3)和TiC两相组成;随着TiC含量的增加,陶瓷复合材料的相对密度降低,开口气孔率增大,当TiC体积分数为30%时,相对密度最大,开口气孔率最低,分别为95.5%和3.0%;陶瓷复合材料中导电相TiC均连接为网状结构,随着TiC含量的增加,TiC所形成的网状结构越发完整,陶瓷复合材料的硬度先升高后降低,电阻率和断裂韧度均呈降低趋势,抗弯强度增大;当TiC体积分数为45%时,陶瓷复合材料的抗弯强度最高,电阻率最低,分别为361 MPa和6.95×10^(-6)Ω·m。Taking Al_(2)O_(3)and TiC powders as raw materials,TiC-Al_(2)O_(3)conductive ceramic composites were prepared by pressureless sintering technique.The effects of TiC content on the microstructure and properties of ceramic composites were investigated.The results show that TiC-Al_(2)O_(3)conductive ceramic composites mainly consisted of Al_(2)O_(3)phase and TiC phase.With increasing content of TiC,the relative density decreased,and the open porosity increased;when the TiC volume fraction was 30%,the ceramic composites had the maximum relative density of 95.5%and the minimum open porosity of 3.0%.The conductive phase TiC in ceramic composites was connected as a network structure;with increasing TiC content,the network structure formed by TiC became more complete,the hardness of ceramic composites increased first and then decreased,the resistivity and fracture toughness decreased,and the bending strength increased.When the TiC volume fraction was 45%,the bending strength was the highest and the conductivity was the lowest,which were 361 MPa,6.95×10^(-6)Ω·m,respectively.

关 键 词：TiC-Al_(2)O_(3)导电陶瓷复合材料 微观结构 力学性能 导电性能 

分 类 号：TQ174[化学工程—陶瓷工业]