Abstract:
TiB
2-TiC-Fe
2Ti composites were prepared by plasma heating synthesis with Ti, B
4C and Fe powders as the raw materials. The phase constitution, microstructure, micro-hardness and fracture morphology of TiB
2-TiC-Fe
2Ti were investigated. The experimental results show that the reaction products are composed of TiB
2, TiC, Fe
2Ti and a small amount of Fe
3C. The TiB
2, TiC and Fe
2Ti phases distribute homogeneously and present in different shapes, in which TiB
2 phases are in hexagonal or rectangular shapes and TiC in spherical ones, while Fe
2Ti phases existing in the gaps between TiC and TiB
2 phases promote the combination of phases. As the heating rate and the cooling rate of plasma beam are fast, the time of the grain growth would decrease and the fine structures can be obtained. With the increasing current, the heat will be higher to promote the growing of TiB
2and TiC, which would bond to each other tightly.