钼及钼合金改性硅化物高温抗氧化涂层研究现状

Research Progress of High Temperature Antioxidant Modified Silicide Coatings of Molybdenum and Its Alloys

钼及钼合金因具有优异的高温力学性能而被广泛应用于电子工业、航空工业、核工业等领域,但这类材料在高温下易氧化的特性限制了其在工业生产中的应用。在钼及钼合金表面制备硅化物涂层是提高其抗氧化性能的主要措施,通过元素改性的方式可进一步提高硅化物涂层的抗氧化防护效果。本文结合近年来钼及钼合金改性硅化物高温抗氧化涂层的研究进展,详述了改性元素抑制涂层氧化损耗、阻止Si贫瘠区形成、提高涂层自愈性和降低涂层裂纹形成倾向四种抗氧化机理,介绍了常见的元素改性硅化物涂层体系及制备工艺,展望了今后钼及钼合金改性硅化物高温抗氧化涂层的研究方向。

Molybdenum and molybdenum alloys are widely used in the electronics industry,aviation industry,nuclear industry,and other fields due to their excellent high-temperature mechanical properties.However,the susceptibility to oxidation of these materials at high temperatures limits their application in industrial production.Preparing silicide coating on the surface of molybdenum and its alloy is the crucial measure to improve the oxidation resistance,and element modification can further improve the protective effect.In this paper,based on the recent research of modified silicide high-temperature anti-oxidation coatings of molybdenum and its alloys,four kinds of anti-oxidation mechanisms of modified element are described,which is,inhibiting the oxidation loss of coating,preventing the formation of Si barren zone,improving the self-healing of coating and reducing the formation tendency of the crack in the coating.The modified silicide coating system and preparation methods are introduced.The research direction of modified silicide high temperature anti-oxidation coatings of molybdenum and its alloys are prospected.