摘要
用自发熔化渗透法制备高TiC含量 (～ 75vol% )的TiC/NiAl复合材料 ,研究了渗透温度和渗透时间对TiC/NiAl复合材料微观组织形成、硬度及断裂性能的影响。采用XRD和TEM /EDS分析了复合材料的相组成、微观结构和NiAl相与TiC颗粒在高温渗透过程中的互溶情况。结果表明 :自发熔渗法是制备致密的TiC/NiAl复合材料的有效方法 ,适当提高渗透温度 ,可大大缩短渗透时间。在完成渗透获得致密组织的前提下 ,渗透温度和渗透时间对TiC/NiAl复合材料的硬度及断裂韧性无显著影响。NiAl相和TiC颗粒结合良好 ,是渗透后复合物的仅有组成相。TiC少量地溶于NiAl,溶解度随渗透时间增长而增大 ,且在TiC颗粒外层 ,发现有少量的Al和微量的Ni。
Pressureless melt infiltration was used for preparing high TiC content TiC/NiAl composites. Effects of the infiltration temperature and time on the microstructure, hardness and fracture toughness of the composites were studied. XRD and EDS/TEM were used to analyze the phase identification and the solubility of NiAl and TiC in each other. The results show that pressureless melt infiltration is an effective method to fabricate dense TiC/NiAl composites. The infiltration time can greatly decrease when the infiltration temperature suitably increases. No obvious effect of the infiltration temperature and time on the hardness and the fracture toughness of the composites was found. NiAl and TiC were well bonded, and they are the only two phases in the composites after infiltration. TiC partially dissolved into NiAl phase, and the solubility increased with increasing infiltration time. Little Al and a trace of Ni were detected at the outer layer of TiC.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2004年第5期11-15,共5页
Acta Materiae Compositae Sinica
基金
国家自然科学基金资助项目 (No 5 0 2 72 0 62 )
中国 葡萄牙科技部双边科技合作项目资助 (国科外字 [2 0 0 1] 0 180号和浙科外字[2 0 0 1] 168号文件 )
关键词
熔化渗透
复合材料
微观组织
碳化钛
镍铝金属间化合物
Fracture
Hardness
Infiltration
Microstructure
Titanium carbide
Transmission electron microscopy
X ray diffraction
