难熔金属表面硅化物涂层的高温防护性能与改性研究进展-中国材料进展

文章信息/Info

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

作者:: 赵科遥; 汪欣; 梁浩然; 游才印; 1. 西安理工大学材料科学与工程学院，陕西西安 710048 2. 西北有色金属研究院，陕西西安 710016 3. 西安石油大学材料科学与工程学院, 陕西西安 710065

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

摘要:: 难熔金属及其合金具有高熔点、良好的高温力学性能和室温加工性能等优点，广泛应用于航空航天和核工业领域，但在高温有氧环境中易发生“灾难性”氧化，导致难熔金属及其合金的高温力学性能快速下降甚至失效，因此需要在其表面制备高温防护涂层，提升其高温抗氧化性能。在适用于难熔金属及其合金的众多高温防护涂层体系中，硅化物涂层应用最为广泛。概述了难熔金属表面硅化物涂层的制备方法、高温抗氧化性能、抗氧化机理以及失效机制；介绍了元素以及陶瓷颗粒掺杂改性的作用机理。经掺杂改性的硅化物涂层体系具有更为优异的高温防护性能，能够有效提升难熔金属在高温有氧环境中的服役温度和服役寿命；在此基础上，展望了难熔金属表面硅化物涂层的发展方向。

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.