等离子喷涂Al-Mo涂层的高温硫腐蚀和氧腐蚀性能研究

发布时间：2018-02-28 18:30

本文关键词： 气化炉喷嘴龟裂等离子喷涂铝钼涂层高温硫腐蚀　出处：《华东理工大学》2016年硕士论文　论文类型：学位论文

【摘要】：水煤浆气化技术不仅能够提高煤的利用效率,而且减少煤在使用过程中造成的的污染。喷嘴是气化炉的核心部件之一,在运行过程中,喷嘴端部迎火面经常发生沿孔口的径向放射性裂纹和不规则龟裂,停炉更换或修复喷嘴严重影响了生产的连续性并造成了巨大的经济损失。研究表明,高温腐蚀特别是硫腐蚀作用是喷嘴端面龟裂的主要原因。本研究以开发具有良好抗高温硫腐蚀和氧腐蚀性能的涂层为目的,以Inconel 600合金和Mo涂层为比较对象重点研究了Al-Mo涂层的高温腐蚀性能。介绍了采用机械合金化方法制备Al-Mo金属间化合物粉末并运用等离子喷涂技术制备了分别以Mo和NiCrAlY为粘结层的Al-Mo涂层和Mo涂层；研究比较了Inconel 600合金、以NiCrAlY为粘结层的Mo涂层和以NiCrAlY为粘结层Al-Mo涂层抗高温硫腐蚀性能；研究比较了Inconel 600合金、Mo涂层和以Mo为粘结层Al-Mo涂层抗高温硫腐蚀和抗高温氧腐蚀性能。研究表明,Mo比NiCrAlY更适合用于Al-Mo涂层的粘结层材料；以Mo为粘结层的Al-Mo涂层在高温硫腐蚀环境中比Mo涂层能更有效地保持表面宏观和截面微观结构的完整性,能够更有效地阻挡硫蒸汽向试样内部的扩散；且以Mo为粘结层的Al-Mo涂层在高温氧化环境中其抗高温氧腐蚀性比Mo涂层显著提高。由此可见,等离子喷涂以Mo为粘结层的Al-Mo涂层不仅具有优良的抗高温硫腐蚀性能,且其抗高温氧腐蚀性能较Mo涂层也有显著提升。该涂层的提出有希望为气化炉喷嘴龟裂失效问题的解决提供了一种经济、便捷、有效的技术方案。
[Abstract]:Coal water slurry gasification technology can not only improve the efficiency of coal utilization, but also reduce the pollution caused by coal in use. The nozzle is one of the core parts of gasifier. Radial radiative cracks and irregular cracks along the orifice are often found in the nozzle tip, which seriously affects the continuity of production and results in huge economic losses, as a result of stopping the furnace to replace or repair the nozzle. High temperature corrosion, especially sulfur corrosion, is the main cause of nozzle face crack. The purpose of this study is to develop coatings with good resistance to high temperature sulfur corrosion and oxygen corrosion. The high temperature corrosion properties of Inconel 600 alloy and Mo coating were studied, and the preparation of Al-Mo intermetallic compound powder by mechanical alloying and plasma spraying were introduced. Al-Mo coating and Mo coating with NiCrAlY as bonding layer; The high temperature sulfur corrosion resistance of Inconel 600 alloy, Mo coating with NiCrAlY as bonding layer and Al-Mo coating with NiCrAlY as bond layer was studied and compared. The high temperature sulfur corrosion resistance and high temperature oxygen corrosion resistance of Inconel 600 alloy Mo coating and Al-Mo coating with Mo as bonding layer were compared. The results show that Mo is more suitable than NiCrAlY to be used as binder material for Al-Mo coating. In high temperature sulfur corrosion environment, Al-Mo coating with Mo as bonding layer can effectively maintain the integrity of surface macro and cross section microstructure and prevent sulfur vapor from diffusing into the sample interior more effectively than Mo coating. Moreover, the Al-Mo coating with Mo as the bonding layer is more resistant to high temperature oxygen corrosion than that of Mo coating in high temperature oxidation environment. It can be seen that the plasma sprayed Al-Mo coating with Mo bond coating not only has excellent high temperature sulfur corrosion resistance. The high temperature oxygen corrosion resistance of the coating is also significantly improved than that of Mo coating, which provides an economical, convenient and effective technical scheme for solving the problem of nozzle crack failure in gasifier.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TQ545;TG178

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