Formation and behavior of thermal barrier coatings on nickel-base superalloys
来源期刊：中国有色金属学报(英文版)2004年第1期
论文作者：高阳 曾飞 解仑
文章页码：44 - 48
Key words：magnetron sputtering; thermal barrier coating; shot peening; high temperature oxidation
Abstract: Plasma-sprayed thermal barrier coatings (TBCs) have been used to extend the life of combustors. Electron beam physical vapor deposited (EB-PVD) ceramic coating has been developed for more demanding rotating as well as stationary turbine components. Here 3 kW RF magnetron sputtering equipment was used to gain zirconia ceramic coatings on hollow turbine blades and vanes, which had been deposited NiCrAlY by cathodic arc deposition. NiCrAlY coating surface was treated by shot peening; the effects of shot peening on the residual stress are presented. The results show that RF sputtered TBCs are columnar ceramics, strongly bonded to metal substrates. NiCrAlY bond coat is made of β,γ′and Cr phases, ZrO2 ceramic layer consists of t′and c phases. No degradation occurs to RF ceramic coatings after 100 h high temperature oxidation at 1 150℃and 500 thermal cycles at 1 150℃for 2 min, air-cooling.
