NiAl/TiC改性C/C复合材料的微观结构及力学性能  

Microstructure and mechanical properties of NiAl/TiC modified C/C composites

作　　者：黄杰[1] 陈招科[1] 熊翔[1] 孙威[1] 王雅雷[1] 王馨爽[1] HUANG Jie CHEN Zhaoke XIONG Xiang SUN Wei WANG Yalei WANG Xinshuang(State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China)

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2017年第3期422-428,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：国家重点基础研究项目(2011CB605805);湖南省科技计划资助项目(2015WK3013);中南大学粉末冶金国家重点实验室资助项目

摘　　要：采用熔渗法对C/C多孔坯体进行预熔渗Ti处理,再用NiAl对预熔渗Ti后的C/C多孔坯体进行金属基体改性,制备出NiAl/TiC金属陶瓷改性C/C复合材料,并初步探讨C/C复合材料中NiAl/TiC金属陶瓷复合结构的形成机理及其对改善复合材料力学性能的作用机理。研究结果表明:预熔渗Ti后,Ti与基体炭反应生成TiC。由于NiAl与TiC润湿性好,生成的TiC可有效改善NiAl在C/C多孔坯体中的熔渗深度。NiAl在C/C多孔坯体中的熔渗深度为3~5 mm,同时,NiAl金属相与TiC陶瓷相在材料中呈镶嵌结构复合生长且分布无规则。经NiAl/TiC金属陶瓷熔渗后,复合材料的密度达到2.39 g/cm3,开孔率为13.44%,抗压强度为85.3 MPa,抗弯强度为67.2 MPa。NiAl/TiC modified C/C composites were prepared by molten infiltration of Ti powder and then using NiAl alloy powder to modify porous C/C preforms. The formation mechanism of NiAl/TiC metal ceramic structure and its effect on the mechanical properties of the composites were also discussed. The results show that, the infiltrated Ti can react with the matrix C to form TiC and improve the infiltration depth of NiAl in C/C porous preforms due to the good wettability between NiAl and TiC, and the infiltration depth of NiAl in C/C composites is about 3-5 mm. The metal phase and ceramic phase are embedded each other with a mosaic microstructure and distribute disorderly in C/C composites. After infiltration of NiAl/TiC metal-ceramic matrix, the density of C/C composites is 2.39 g/cm^3, the porosity is l3.44%, the compressive strength and the flexural strength are 85.3 MPa and 67.2 MPa, respectively.

关 键 词：C/C复合材料 镍铝 基体改性 熔渗法 TIC 

分 类 号：TB332[一般工业技术—材料科学与工程]