采用电弧离子镀技术在镍基高温合金K465上制备了(MCrAlY+AlSiY)复合涂层, 分析了复合涂层的组织及结构, 对比研究了NiCoCrAlYSiB单一涂层及(NiCoCrAlYSiB+AlSiY)复合涂层分别在1000及1100 ℃时的恒温氧化行为和从1000 ℃到室温的循环氧化行为. 结果表明: 退火后复合涂层外层主要由β--(Ni, Co)Al相及少量σ--NiCoCr和Cr3Si相组成, 内层主要是富Cr相及少量β--(Ni, Co)Al相. 氧化过程中由于Al的消耗, 单一涂层表面生成了尖晶石和NiO, 而复合涂层中的β--(Ni, Co)Al相退化成γ/γ'相, 提供Al源支持表面Al2O3膜的形成和修复, 从而提高了抗高温氧化性能.
A composite coating (MCrAlY+AlSiY) was prepared on a Ni--based superalloy K465 by arc ion plating technique. The oxidation behaviors of the composite coating and the reference coating NiCoCrAlYSiB were investigated. The results show that the outer layer of composite coating consists of β--(Ni, Co)Al and dispersed σ--NiCoCr and Cr3Si, and the inner layer of composite coating consists of Cr--rich phases and minor β--(Ni, Co)Al after vacuum annealing at 1050 ℃. Because of the excessive consumption of Al, the spinels and NiO are formed on the surface of the reference coating. For the composite coating, the protective alumina scale is continuous and dense. The enhanced oxidation resistance of the composite coating is related to the gradient distributions of Al--enriched outer layer and Cr--enriched inner layer.
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