Microstructural evolution and interdiffusion behavior of Mo-Si-B coating on Nb-Si based alloy

作者：Pi, Jinliang; Shao, Wei; Zhou, Chungen^*

来源：Intermetallics, 2018, 95: 150-156.

DOI：10.1016/j.intermet.2018.02.003

• Silicides
• Diffusion
• Coatings
• Microstructure

A Mo-Si-B coating was prepared on an Nb-Si based alloy by detonation-gun spraying of Mo followed by co-deposition of Si and B via pack cementation. The microstructural evolution and interdiffusion behavior of the coating/substrate system were investigated by annealing for different times at 1250 degrees C in argon atmosphere. The results show that the interdiffusion zone has a two-layer structure consisting of (Mo, X')(5)Si-3 (X' = Nb, Ti, Cr, Hf) and (Nb, X)(5)Si-3 (X = Ti, Cr, Hf), respectively. The growth of the transitional layer, which obeys a parabolic rate law, is dominated by the inward diffusion of Si from the outer layer to the substrate. The interdiffusion coefficients of Si in the transitional layers are calculated using a modified method based on the Boltzmann-Matano analysis.

• 出版日期2018-4
• 单位北京航空航天大学