Investigation on plasma-sprayed ZrO₂ thermal barrier coating on nickel alloy substrate

来源期刊：中南大学学报(英文版)2002年第4期

论文作者：卢安贤 常鹰 蔡小梅

文章页码：225 - 228

Key words：plasma spray; Ni alloy substrate; transition layer; ZrO₂ceramic layer; thermal barrier coating

Abstract: The thermal barrier coatings with NiCrAlY alloy bonding layer, NiCrAlY-Y₂O₃stabilized ZrO₂transition layer and Y₂O₃stabilized ZrO₂ceramic layer are prepared on nickel alloy substrates using the plasma spray technique. The relationship among the composition, structure and property of the coatings are investigated bymeans ofoptical microscope, scanning electronic microscope and the experiments ofthermal shock resistance cycling and high temperature oxidation resistance. The results showthat the structure design of introducing a transition layer between Ni alloy substrate and ZrO₂ceramic coating guarantees the high quality and properties of the coatings; ZrO₂coatings doped with a little SiO₂possesses better thermal shock resistance and more excellent hot corrosion resistance as compared with ZrO₂coating materials without SiO₂;the improvement in performance of ZrO₂coating doped with SiO₂is due to forming more dense coating structure by self-closing effects of the flaws and pores in the ZrO₂coatings.