[T4] Hot Isostatic Pressing

[15P-T4-02] The Effect of Hot Isostatic Pressing Temperature on the Microstructure and Properties of Mo₂FeB₂-Based Ceramets

*K. Ma¹, J. H. Sun¹, H. K. Tang¹, Z. H. Qu¹, Q. X. Wang¹, Y. Z. Wang¹, S. Q. Li¹, Y. J. Lai¹ (1.Sino-Euro Materials Technologies of Xi'an Co., Ltd., China)

Keywords: Mo2FeB2, HIP, Microstructure

In this study, synthetic powders was used to prepare Mo₂FeB₂ based ceramic hard layers on stainless steel by hot isostatic pressing(HIP) technology. The influence of hot isostatic pressing temperature on the microstructure, interface, and hardness of Mo₂FeB₂ substrate was investigated. It was found, as the HIP's temperature increases, the Mo₂FeB₂ phase is distributed from irregular blocks to dispersed particles and grows again. The increase in temperatue leads to sufficient diffusion of the interface layer. Above 1200 ^oC, a clear interface between the matrix and the hard layer cannot be observed, at the same time the hardness of the ceramic layer is related to the morphology of Mo₂FeB₂ phase. At low temperatures, the hardness of the large hard phase is as high as 1353HV_0.5. As the temperature increases, the hard phase becomes fine and uniform, and the hardness decreases to 983HV_0.5.