Dissolution-precipitation mechanism of self-propagating high-temperature synthesis of TiC-Cu cermets

Guoqing Xiao1), Feng Duan1), Gang Zhang1), and Quncheng Fan2) 1) School of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China 2) State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China

摘 要：The mechanism of self-propagating high-temperature synthesis （SHS） of TiC-Cu cermets was studied using a combustion front quenching method. Microstructural evolution in the quenched sample was observed using scanning electron microscope （SEM） with energy dispersive X-ray （EDX） spectrometry, and the combustion temperature was measured. The results showed that the com- bustion reaction started with local formation of Ti-Cu melt and could be described with the dissolution-precipitation mechanism, namely, Ti, Cu, and C particles dissolved into the Ti-Cu solution and TiC particles precipitated in the saturated Ti-Cu-C liquid solu- tion. The local formation of Ti-Cu melt resulted from the solid diffusion between Ti and Cu particles.

关键词：