Microstructure of TiAl/TiC cermet joint bonded by combustion synthesis

来源期刊：中国有色金属学报(英文版)2005年第z3期

论文作者：曹健 冯吉才 李卓然

文章页码：323 - 326

Key words：TiAl alloys； TiC cermets； join； combustion synthesis； microstructure

Abstract: TiAl alloys were joined to TiC cermets using combustion synthesis method. The Ti-C-Ni metallic powder compact acted as a joining interlayer in the joining process. The identification and mechanisms of the reaction at the interface and interlayer were investigated. From the analysis of the microstructure of TiAl/TiC cermet joint, it is noted that TiC and TiNi compounds are main reaction products and unreacted Ni is observed in the interlayer. The reaction products consist of a large volume of voids or unreacted regions. It is confirmed that Al addition as well as joining pressure are effective to decrease the voids. It is considered that high flowability of liquid Al enhances the SHS reaction and the densification of reaction products. There is a continuous Ni-rich layer observed at the interface between the interlayer and TiC cermets substrate. Ti₃Al, TiC and TiNi compounds are observed in the reaction products.