Journal
MATERIALS
Volume 13, Issue 16, Pages -Publisher
MDPI
DOI: 10.3390/ma13163592
Keywords
silicide coating; refractory high-entropy alloys; Si-20Cr-20Fe; high-temperature oxidation; fused slurry method
Categories
Funding
- Chinese Academy of Sciences
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In this paper, the Si-20Cr-20Fe coating was prepared on MoNbTaTiW RHEA by a fused slurry method. The microstructural evolution and compositions of the silicide coating under high-temperature oxidation environment were studied. The results show that the silicide coating could effectively prevent the oxidation of the MoNbTaTiW RHEA. The initial silicide coating had a double-layer structure: a high silicon content layer mainly composed of MSi(2)as the outer layer and a low silicon content layer mainly contained M(5)Si(3)as the inner layer. Under high-temperature oxidation conditions, the silicon element diffused from the silicide coating to the RHEA substrate while the oxidation of the coating occurred. After oxidation, the coating was composed of an outer oxide layer and an inner silicide layer. The silicide layer moved toward the inside of the substrate, led to the increase of its thickness. Compared with the initial silicified layer, its structure did not change significantly. The structure and compositions of the oxide layer on the outer surface strongly depended on the oxidation temperature. This paper provides a strategy for protecting RHEAs from oxidation at high-temperature environments.
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