摘要
表面扩散渗铝形成的β－ＮｉＡｌ涂层表面注入Ｍｇ＋１×１０１７／ｃｍ２后，在１０００℃空气中恒温氧化２５ｈ，涂层的氧化增重速率有所增加，这是由于注Ｍｇ的β—ＮｉＡｌ涂层表面形成了Ａｌ２Ｏ３氧化物“瘤”，长时间氧化后氧化物“瘤”周围及“瘤”本身发生开裂，引起涂层内氧化。
Ion implantation of 1×1017 Mg+/cm2 increased the oxidation rate of β-NiAl coating,which was made by diffusion aluminizing method on cast nickel base superalloy K438 in air at 1000℃. SEM examination revealed that 'tumour-like' A12O3 oxides grown on the surface of Mg implanted β-NiAl coating.EPMA analysis also showed that there existed Ni rich oxides around the above-mentioned 'tumor-like' Al2O3 oxides. As a result of oxide scale cracking occurred at the interface Ni-rich oxides/Al2O3 'tumor' or on the oxide 'tumor' itself due to longer time oxidation,deep internal oxidation occurred along the crack into the coating. Hence,Mg ion implantation reduced the high temperature oxidation resistance of β-NiAl coating.
出处
《腐蚀科学与防护技术》
CAS
CSCD
1994年第1期92-95,共4页
Corrosion Science and Protection Technology
基金
国家自然科学基金
关键词
氧化
离子镀
镀镁
覆层
镍铝
Mg ion implantation,β-NiAl coating,oxidation
