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所属单位：材料科学与技术学院

发表刊物：APPLIED SURFACE SCIENCE

关键字：Al-Y coating Magnetron sputtering Gradient structure Hot corrosion

摘要：It is generally accepted that the crack is appeared when the thermal stress is accumulated which caused by the mismatch of coefficient of thermal expansion, through which oxygen will severely destroy the substrate at high temperature environments. Therefore, the coatings with gradient structure to reduce thermal expansion mismatch should greatly improve their service stability. Here AleY gradient coating is prepared on gamma-TiAl alloy by magnetron sputtering. The results show that the hot corrosion resistance of gamma-TiAl alloy could be greatly improved, and the activation energy at (750 degrees C-950 degrees C) can be calculated to be 126.88 KJ/mol for the coating. The Al2O3 and Y3Al5O12 (YAG) are the primary phases after hot corrosion, thus providing efficient protection at 750, 850 degrees C. At 950 degrees C, the consumption of oxide layers is accelerated due to the increased temperature so that some corrosive elements (such as S and Na) unavoidably invade into the scale. The improvement of hot corrosion resistance primarily owes to the existence of Y preferentially oxidizes Al to form alpha-Al2O3, and the effect of grain refinement of YAG phases.

ISSN号：0169-4332

是否译文：否

发表时间：2019-09-01

合写作者：林浩,Jia, Yanlin,缪强,胡荣耀,丁铮,虞礼嘉

通讯作者：梁文萍,Jia, Yanlin,梁文萍