Abstract
A protective MoSi2 coating on Nb substrate was prepared by air plasma spraying and annealing followed by siliconizing. The influence of annealing for plasma-sprayed Mo layer on the subsequent preparation of MoSi2 coating was investigated. Oxidation behavior of the MoSi2 coating was investigated at 1200 °C in air. Phase constituents and microstructure of the MoSi2 coating were characterized by x-ray diffraction and scanning electron microscopy. High-temperature annealing significantly decreases the porosity of the as-sprayed Mo coating (from 9.6 to 2.1%). After vacuum annealing, the splat boundaries and lamellar microstructure of the as-sprayed coating disappear and the recrystallized structure of the Mo coating appears. The MoSi2 coating falls off from the surface of the as-sprayed Mo coating during siliconizing process. The MoSi2 coating prepared on the annealed Mo layer surface has a dense microstructure, which shows a good interface bond between the coating and the Nb substrate. The coating has a multilayer structure, with MoSi2 outer layer, Mo middle layer, and Mo-Nb alloy inner layer. The MoSi2 coating exhibits an excellent oxidation resistance at 1200 °C in air.
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The financial support of the National Natural Science Foundation of China (No. 51475161) and (No. 51241010) is gratefully acknowledged.
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Yan, J., Wang, Y., Liu, L. et al. Preparation of Protective MoSi2 Coating on Niobium Substrate. J Therm Spray Tech 24, 1093–1099 (2015). https://doi.org/10.1007/s11666-015-0258-7
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DOI: https://doi.org/10.1007/s11666-015-0258-7