【摘要】 用大气等离子喷涂方法在基体材料ＧＨ８６４（Ｗａｓｐａｌｏｙ）合金上制备ＣｏＮｉＣｒＡｌＴａＳｉＹ涂层，在７５０℃／１００ｈ的熔盐热腐蚀试验，测定该涂层的抗热腐蚀性能．用ＳＥＭ、ＳＴＥＭ、ＸＲＤ，ＥＭＰＡ等观察涂层形貌、成分及组织结构变化，并讨论抗热腐蚀机理。结果表明，ＣｏＮｉＣｒＡｌＴａＳｉＹ涂层的热腐蚀性能取决于Ｓ（２－）通过缺陷进入涂层内形成腐蚀产物和涂层表面防护性氧化层的形成。该涂层具有较好的抗热腐蚀性能。提出了ＣｏＮｉＣｒＡｌＴａＳｉＹ涂层抗热腐蚀过程模型，阐明了抗热腐蚀机理。更多还原

【Abstract】 Hot corrosion(HC) of the APS(atomospheric plasma spraying)CoNiCrAlTaSiY coating on a nickel-base superalloy GH864 has been studied. The effect of laser-treatment on hot corrosion resistance was also examined.It was shown that CoNiCrAlTaSiY coating had superior properties in resistance to hot corrosion due to the readiness of the formation of a protective Cr2O3 scale on the coating surface.A model for the mechanism of hot corrosion of this coating has been suggested. Hot corrosion resistance of this coating was significantly increased by the laser treatment simply because the surface of the as sprayed coating was densified by the high power laser beam.更多还原