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研究了用高速火焰喷涂(HVOF)替代低压等离子喷涂(LPPS)沉积高质量的MCrAlY涂层。试验用粉料为NiCoCrAlTaReSiY,采用以煤油为燃料的K2型HVOF系统沉积涂层,研究喷嘴长度、喷涂工艺参数对粉末沉积工艺过程以及涂层性能的影响;测量涂层的孔隙率及氧含量,观察涂层经真空热处理以及高温空气氧化后的显微结构,测量了Al、O等元素在氧化涂层中的分布。结果表明,所沉积的NiCoCrAlTaReSiY涂层具有优越的抗氧化性。
The deposition of high quality MCrAlY coatings by high velocity flame spraying (HVOF) instead of low pressure plasma spraying (LPPS) was investigated. The test powder is NiCoCrAlTaReSiY, the deposition of K2-type HVOF system using kerosene as fuel, the influence of nozzle length and spray process parameters on the powder deposition process and coating performance; the porosity and oxygen content of the coating, The microstructure of the coating after vacuum heat treatment and high temperature air oxidation was observed. The distribution of Al, O and other elements in the oxide coating was measured. The results show that the deposited NiCoCrAlTaReSiY coating has excellent oxidation resistance.