Abstract
Diffusive reaction layer on Mo metal covered by C powder (Si powder or SiC powder, i.e. C-Si system) and heat treated in vacuum ranging from 600°C to 1600°C for 2 h was investigated. Microstructure of interfacial reaction layer between C-Si system/Mo metal were characterized by XRD, SEM, and mechanical properties were compared between reaction layer based on Mo and Mo. The results show: after Si diffusing into Mo, Mo3Si phase appears after heat treatment higher than 1000°C, Mo5Si3 phase forms at 1400°C, even MoSi2 phase appears; after C diffusing into Mo, Mo2C phase appears firstly, then MoC forms at 1400°C; after SiC diffusing into Mo, Mo2C appears first, Mo3Si then forms at 1200°C, Mo5Si3(Mo2C and Mo5Si3C) mutiphase coexist on Mo surface after heat treatment high than 1400°C. Tensile and specific elongation of C-Si system/Mo vary little, but Vickers hardness of Mo diffused by C or Si comparing with Mo enhance distinctly.
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