CNTs对B_4C放电等离子烧结行为和力学性能的影响  

Influence of CNTs on the Sintering Behavior and Mechanical Properties of Boron Carbide by SPS Process

作　　者：魏红康[1] 赵林[1] 汪长安[1,2] 谢志鹏[1,2] 邓翔宇[1] 

机构地区：[1]景德镇陶瓷学院材料学院,景德镇333000 [2]清华大学材料学院,北京100084

出　　处：《人工晶体学报》2014年第12期3140-3144,共5页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51102120;51202097);清华大学新型陶瓷与精细工艺国家重点实验室开放课题;景德镇市科技计划项目

摘　　要：在1600℃、50 MPa条件下,采用放电等离子烧结工艺制备出了CNTs/B4C陶瓷基复合材料。研究了CNTs添加量对B4C烧结行为和力学性能的影响。采用X射线衍射仪和扫描电镜分析了复合材料的物相组成和微观结构。结果表明:随着CNTs含量的增加,复合材料的相对密度和力学性能呈现先增加后减小的变化趋势,且当CNTs含量为1wt%时,相对密度和力学性能达到最大值。分析认为,适量的CNTs有利于烧结过程中粉体的滑移,可以提高复合材料的烧结致密度,而随着CNTs含量的增加,位阻效应显著,使得复合材料的致密度降低。CNTs / B4 C ceramic matrix composites were prepared by spark plasma sintering at 1600 ℃under 50 MPa. The effects of CNTs additions on the sintering behavior and mechanical properties of B4 C were studied. The phase composition and microstructure of the composites were analyzed by XRD and SEM. The results indicate that the relative density and mechanical properties first increases as the CNTs contents increasing,and thereafter decreases. As the CNTs content was 1wt%,the maximum relative density and mechanical properties were obtained. The appropriate content of CNTs were beneficial for the powder sliding during the sintering process,resulting in the improvement of density. As the CNTs contents increasing,the density decreased,due to the obvious space steric hindrance.

关 键 词：碳化硼 碳纳米管 放电等离子烧结 力学性能 烧结行为 

分 类 号：TB35[一般工业技术—材料科学与工程]