ABSTRACT

Thermal spray coatings are a group of coating processes that enhance the performance of parts by adding functionality to surfaces. In the past few decades, thermal spray coatings technology was used to resist wear, erosion, corrosion, cavitation, repair and dimensional restoration of parts. However, the consideration of process parameters setting develops a reliable coating having high mechanical and morphological properties for demanding coating applications. Hence the aim of this review paper is to provide an overview of distinct thermal spray coatings, historical development, hot corrosion mechanism and effect of chemical composition and alloying elements on the hot corrosion resistance of super alloys in USC power plants. Then the effects of processing conditions on the mechanical properties of distinct thermal sprayed coatings obtained at distinct process parameters are summarised. Finally, the distinct thermal post treatments such as fusing of self-flux alloys, remelting and solid heat treatments, merits, demerits and future challenges are discussed.

摘要

热喷涂涂层是一组涂层工艺，可通过为表面增加功能来提高零件的性能。在过去的几十年里，热喷涂技术被用来抵抗零件的磨损、侵蚀、腐蚀、气蚀、修复和尺寸恢复。然而，对工艺参数设置的考虑为要求苛刻的涂层应用开发了具有高机械和形态特性的可靠涂层。因此，本综述的目的是概述不同的热喷涂涂层、历史发展、热腐蚀机制以及化学成分和合金元素对 USC 发电厂超级合金耐热腐蚀性的影响。然后总结了加工条件对在不同工艺参数下获得的不同热喷涂涂层的机械性能的影响。最后，讨论了不同的热处理，如自熔合金的熔化、重熔和固体热处理、优点、缺点和未来的挑战。