Ni_3Al金属间化合物及溅射CoCrAlY涂层的高温热腐蚀

Hot Corrosion of Ni_3Al Intermetallics and Its Sputtered CoCrAlY Coating

研究了Ｎｉ_３Ａｌ金属间化合物及溅射ＣｏＣｒＡｌＹ涂层在９００～９５０℃空气中，表面存在（Ｎａ，Ｋ）_２ＳＯ_４盐膜时的热腐蚀行为。结果表明，Ｎｉ_３Ａｌ遭受严重的热腐蚀。溅射ＣｏＣｒＡｌＹ涂层可以通过在表面迅速形成保护性Ａｌ、Ｃｒ氧化膜而显著改善Ｎｉ_３Ａｌ的耐热腐蚀性能。

ot corrosion of Ni_3Al intermetallic compound and sputtered COCrAlY coating on Ni_3Al in the pres-ence of(Na,K)_2SO_4 salts film at 900～950℃ in air were studied. It is shown that Ni_3Al suffers hot corrosion, and sputtered CoCrAlY coating can grcatly improve hot corrosion resistance of Ni_3Al by the for-mation of protective Al,Cr oxides scale.