Structure of B-Modified MoSi₂ Coating on C103 Alloy Prepared through Glow Plasma Deposition and HAPC Combined Method

Abstract:

Glow plasma deposition (GPD) and halide activate pack cementation (HAPC) methods were combined to prepare B-modified MoSi₂ coatings on C103 alloy. The pure Mo layer was firstly deposited on the substrate through GPD process, and then Si and B were co-deposited into the Mo layer through HAPC process to form the B-modified MoSi₂ coating. Experimental results revealed that the Mo layer exhibited metallurgical bonding with the substrate. Two typical coatings were produced through the above combined method. One consisted of the MoSi₂ outer layer, the MoSi₂+MoB two-phase middle layer and the Mo₅Si₃ inner layer, the other consisted of an outer deposits layer composed of MoSi₂ matrix and MoB dispersions, and an inner diffusion layer composed of NbSi₂, NbB₂ and Nb₅Si₃ phases. The latter coating was oxidized at 1250 °C, and it has been found that the protective scale can form on the coating surface, which indicates the good oxidation resistance of such B-modified MoSi₂ coating prepared through the combined method.

• Periodical: Materials Science Forum (Volume 816)
• Pages: 249-254
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.816.249
• Online since: April 2015
• Authors: Xiao Dong Tian, Xi Ping Guo, Zhi Ping Sun, Jiang Long Qu, Li Jie Wang
• Keywords: Boron, C103 Alloy, Coating, MoSi₂, Oxidation

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