IMPROVEMENT OF HOT CORROSION RESISTANCE OF Ti₃Al INTERMETALLIC COMPOUND BYIMPROVEMENT OF HOT CORROSION RESISTANCE OF Ti_3Al INTERMETALLIC COMPOUND BY SPUTTERED NiCrAlY COATING SPUTTERED NiCrALY COATING

来源期刊：中国有色金属学报(英文版)1995年第1期

论文作者：Zeng Chaoliu Zhang Jianqing Wu Weitao Zhu Shenglong

文章页码：76 - 79

Key words：intermetallic compounds; Ti₃Al NiCrAlY coating; hot corrosion

Abstract: The effects of sputtered NiCrAlY coating on hot corrosion resistance of Ti₃Al intermetallics in the presence of(Na, K)₂SO₄ salts film at 950℃ in air were studied. It was shown that Ti3Al suffered from severe corrosion , forming a poor adhesive scale with an outer TiO₂-enriched and inner Al₂O₃ enriched layer. The electrochemical mechanism was responsible for the corrosion process. The sputtered NiCrAlY coating can greatly improve corrosion resistance of Ti₃Al by the the formation of a good adhesive Al₂O₃ enriched scale. But a-three-layer diffusion zone formed between coating and substrate alloy.