Abstract
In this work, ZrB2-20 vol.% MoSi2 (denoted as ZM) composite coatings were fabricated by atmospheric plasma spray (APS) and vacuum plasma spray (VPS) techniques, respectively. Phase composition and microstructure of the composite coatings were characterized. Their oxidation behaviors and microstructure changes at 1500 °C were comparatively investigated. The results showed that VPS-ZM coating was composed of hexagonal ZrB2, tetragonal and hexagonal MoSi2, while certain amount of ZrO2 existed in APS-ZM coating. The oxide content, surface roughness and porosity of VPS-ZM coating were apparently lower than those of APS-ZM coating. The mass gain of APS-ZM coating was maximum at the beginning (1500 °C, 0 h) and then decreased with the oxidation time extending, while the mass of VPS-ZM coating gradually increased with increasing the oxidation time. The possible reasons for the different oxidation behaviors of the two kinds of coatings were analyzed.
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This work was supported by the National Natural Science Foundation (for Young Scholar) of China under Grant 51102267, Youth Innovation Promotion Association CAS, Engineering case study in extreme conditions using system mechanics approach (XDB22010202).
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This article is an invited paper selected from presentations at the 2016 International Thermal Spray Conference, held May 10-12, 2016, in Shanghai, P.R. China, and has been expanded from the original presentation.
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Niu, Y., Wang, Z., Zhao, J. et al. Comparison of ZrB2-MoSi2 Composite Coatings Fabricated by Atmospheric and Vacuum Plasma Spray Processes. J Therm Spray Tech 26, 100–107 (2017). https://doi.org/10.1007/s11666-016-0490-9
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DOI: https://doi.org/10.1007/s11666-016-0490-9