Effects of TiB2 contents on the microstructure and oxidation behavior of Mo-Si-B composite coatings
Source abstract
Abstract
A novel Mo-Si-B-TiB 2 composite coating was prepared on Nb-Si based ultrahigh temperature alloy by slurry sintering. The effects of TiB 2 contents (1, 3, 5 and 10 wt%) on the microstructure and oxidation behavior of Mo-Si-B composite coatings were revealed. The results show that TiB 2 modified Mo-Si-B composite coatings display a bilayer structure, in which the outer layer is composed of MoSi 2, Mo 5Si 3 and TiB 2 phases, and the inner layer is composed of (Ti,Nb) 5Si 4, (Nb,X) 5Si 3 and (Nb,Ti)B 2 phases. The added TiB 2 particles are evenly distributed in the outer layer of the coatings. By introducing TiB 2 into the coating, the service life of Mo-Si-B composite coatings is extended from 50 h to 100 h at 1250 ℃, the oxidation rate of the coating is reduced from 1.62 to 0.02 mg 2 cm −4 h −1. This indicates that the addition of appropriate TiB 2 effectively slows down the oxidation rate and significantly improves the oxidation resistance of Mo-Si-B composite coatings. The Mo-Si-B composite coating with 3 wt% TiB 2 had the lowest mass gain (3.9 mg/cm 2) after oxidation at 1250 ℃ for 100 h, and it exhibited the best oxidation resistance. This is attributed to the formation of composite oxide scale with crack-free, good healing ability, suitable levels of differential thermal expansion and low oxygen permeability.
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Research context
OpenAlex topics: Advanced materials and composites · Intermetallics and Advanced Alloy Properties · Metal and Thin Film Mechanics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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