Ti_2AlC/TiAl复合材料的抗热震性能研究  

Study on Thermal Shock Resistance of Ti_2AlC/TiAl(Nb, B) Composites

作　　者：岳云龙[1] 尹海燕[2] 吴海涛[1] 徐言超[1] 

机构地区：[1]济南大学,山东济南250022 [2]中国海洋大学,山东青岛266100

出　　处：《稀有金属材料与工程》2007年第7期1149-1152,共4页Rare Metal Materials and Engineering

基　　金：山东省自然科学基金重点项目资助(Z2003F02)

摘　　要：　利用放电等离子烧结（SPS）技术，原位制备Ti2AlC／TiAl（Nb，B）复合材料，并对其进行快速升温热处理。采用残余强度法对复合材料在225～825℃范围内的抗热震性能进行测试。结果表明：随热震温差的升高，试样显微结构变得疏松，内部出现孔洞和裂纹，导致材料热震后强度下降；热处理后复合材料的抗热震性能明显提高，断裂方式的改变及显微组织的细化是产生这一现象的主要原因。In this paper, the spark plasma sintering （SPS） technology was used tn-situ to fabricate the Ti2AlC/TiAl（Nb, B） composites. The thermal shock resistances were investigated by residual strength method from 225 ℃ to 825 ℃ for the composites. It＇s shown that with increasing the temperature difference of thermal shock, the microstructur~ became looser, and holes and cracks appeared inside, as a result, the strength of thermal shock resistances decreased. But the thermal shock resistance of composites were obviously increased after heat treatment due to the change of fracture mode and the refinement of microstructures.

关 键 词：Ti2AlC/TiAl(Nb B)复合材料 抗热震性 热处理 

分 类 号：TB331[一般工业技术—材料科学与工程]