引言在高温系统下的工作条件对零部件的功率重量比和寿命要求如此之高,以致使材料就其性能而言,在选取方面可能十分苛刻。材料的选择取决于该材料在给定工作温度下所能提供的蠕变和疲劳强度。然而,高温下的材料还要经受腐蚀现象,如氧化、热腐蚀或渗碳。材料的化学组成提供了机械性能,但在提供足够的抗腐蚀能力方面则贡献甚微。如今这一问题通过在零件表面上使用另一种材料的薄层(涂层)而得以解决,这一 Introduction Operating conditions at high temperature systems require so high a power-to-weight ratio and life expectancy that the material can be very demanding in terms of its performance. The choice of material depends on the material’s creep and fatigue strengths at the given operating temperature. However, materials at high temperatures are also subject to corrosion phenomena such as oxidation, hot corrosion or carburization. The chemical composition of the material provides mechanical properties, but makes little contribution to providing sufficient corrosion resistance. This problem is now solved by the use of a thin layer (coating) of another material on the surface of the part