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一种新型细晶Ni3Al涂层抗高温氧化性能研究

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Keywords: 氧化,细晶,Ni3,Al,退火,孔洞

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Abstract:

通过600℃/2h真空退火,使复合电沉积的Ni-14.1mass\%Al膜(平均粒径为1μm)合金化,获得一种新型细晶Ni3Al涂层.对比研究了该涂层与粗晶Ni3Al合金900℃下50h恒温氧化过程.结果表明,细晶涂层可快速生长连续Al2O3膜,导致NiO的生长受到明显抑制.与粗晶合金相比,该氧化膜粘附性更强.其原因可能在于氧化时细晶结构可抑制源自氧化膜的阳离子空位及Ni3Al中因Al、Ni的互扩散所致的“Kirkendall”空位在氧化膜/基体界面沉积形成孔洞,提高了二者的结合强度.

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