Development of coatings for protection in specific high temperature environments
Development of coatings for protection in specific high temperature environments
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DOI：
10.1016/j.surfcoat.2006.07.262
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发表时间：
2006-12
影响因子：
5.4
通讯作者：
M. Schütze;M. Malessa;V. Rohr;T. Weber
中科院分区：
文献类型：
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作者：
M. Schütze;M. Malessa;V. Rohr;T. Weber
金属和金属间化合物涂层广泛用于喷气发动机和陆基燃气涡轮机中，用于发动机较热部件的氧化和腐蚀保护。然而，在许多工业过程中，在高温下使用保护涂层可能有助于显着延长寿命或提高操作温度，从而提高效率。这些工业的实例是废物、生物质和煤的焚烧和气化，化学加工工业和石化厂，其中遇到含有例如碳、氯、硫、钒或碱性物质的高度侵蚀性环境。由于这些工艺环境中的大多数仅包含非常低的氧分压或显示出高浓度的极端侵蚀性化合物，因此常规的未涂覆材料达到了它们的极限。近年来，在实验室工作中，已经开发出许多用于高温应用的新型涂层，包括扩散涂层、覆盖涂层和用于密封孔隙的纳米技术方法。本文讨论了这一发展的背景和热力学基础，以及一些基于多元素涂层协同效应的最新解决方案。本文将介绍这些涂层在硫化、渗碳、氯化和钒酸盐环境中的性能试验结果。最后，可以得出结论，不同类型的涂料适用于其特定的应用。
Metallic and intermetallic coatings are widely used in jet engines and land-based gas turbines for oxidation and corrosion protection in the hotter parts of the engines. However there is a significant number of industrial processes where the use of protective coatings at high temperatures could contribute to a significant extension of life-time or an increase in operation temperature and thus efficiency. Examples of such industries are incineration and gasification of waste, biomass and coal, chemical process industries and petrochemical plants where highly aggressive environments are encountered containing species of e.g. carbon, chlorine, sulphur, vanadium or alcalines. Since most of these process environments contain only very low oxygen partial pressures or exhibit high concentrations of extremely aggressive compounds, the conventional, uncoated materials come to their limits. In recent years in laboratory work a number of new types of coatings have been developed for high-temperature applications which include diffusion coatings, overlay coatings and nanotechnological approaches for sealing porosity. In the paper the background of this development and the thermodynamic fundamentals are discussed together with some more recent solutions based on synergistic effects of multi-element coatings. Some results of performance tests of these coatings in sulfidizing, carburizing, chloridizing and vanadate environments will be presented. At the end conclusions can be drawn on the suitability of the different types of coatings for their specific applications.