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Phase reactions on surface of nickel-base alloys during tests and service

机译：在测试和使用过程中镍基合金表面的相反应

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X-ray diffraction analysis has been used to study the oxide phase composition of the surface of nickel-base alloys, which have different alloying levels under air conditions, and in tests with an ash film environment. Several stages of phase reaction and the directivity of phase reactions during oxidation have been revealed. The lattice parameter of the spinel oxide depends on the alloy content (mainly Cr/Al ratio). The surface structure of gas turbine blades after service in power plants and gas compressor stations has been examined. The different types of sulphate, oxide and sulphide compounds formed on the uncoated blade surface have been established. This suggested the development of sulphide-oxide corrosion process. The surface study of MCrAlY-coated blades revealed the formation of different types oxides during operation.
机译：X射线衍射分析已用于研究镍基合金表面的氧化物相组成，这些合金在空气条件下以及在灰膜环境下的测试中具有不同的合金化水平。揭示了相反应的几个阶段以及氧化过程中相反应的方向性。尖晶石氧化物的晶格参数取决于合金含量（主要是Cr / Al比）。已检查了在电厂和气体压缩机站维修后的燃气轮机叶片的表面结构。已经确定了在未涂覆的叶片表面上形成的硫酸盐，氧化物和硫化物的不同类型。这暗示了硫化物腐蚀过程的发展。 MCrAlY涂层叶片的表面研究表明，在操作过程中会形成不同类型的氧化物。

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