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Title:: Research Progress on High-Temperature Protection Performance and Modification of Silicide Coatings on Refractory Metal Surfaces

Author(s):: ZHAO Keyao; WANG Xin; LIANG Haoran; YOU Caiyin; 1. School of Materials Science and Engineering, Xi’an University of Technology,Xi’an 710048, China 2. Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China et al.

Keywords:: refractory metals; silicide coating; high-temperature oxidation resistance; elemental modification; ceramic particle doping modification

Abstract:: Refractory metals and their alloys are widely used in the aerospace and nuclear industry due to their high melting point, good high-temperature mechanical properties and room temperature forming performance and so on. However,they are prone to “catastrophic” oxidation in the high-temperature oxidation environment, resulting in a rapid decrease in high-temperature mechanical properties or even failure of underlying refractory metals. Therefore, it is necessary to improve their high-temperature oxidation resistance by preparing high-temperature protective coatings. Among high-temperature protective coating systems, silicide coatings have the most widespread application. This investigation provided an overview of the preparation methods, high-temperature oxidation resistance, oxidation resistance mechanism and failure mechanism of silicide coatings on refractory metals. Furthermore, the mechanism of doping modification with elements and ceramic particles was introduced. The modified silicide coating had superior high-temperature oxidation protection performance, which could effectively improve the service temperature or service life of refractory metals in hightemperature oxidation environments. On this basis, the development direction of silicide coatings on refractory metals was prospected.