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丁坤英,程涛涛.多孔ZrO2-8 wt% Y2O3涂层的制备及性能[J].稀有金属材料与工程(英文),2018,47(6):1677~1681.[Ding Kunying and Cheng Taotao.Formation and Properties of Porous ZrO2-8 wt% Y2O3 Coatings[J].Rare Metal Materials and Engineering,2018,47(6):1677~1681.]
Formation and Properties of Porous ZrO2-8 wt% Y2O3 Coatings
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Received:October 17, 2016  Revised:April 11, 2017
Key words: ZrO2-8 wt% Y2O3  abradability  sol-gel  porosity  incursion depth
Foundation item:国家自然基金(51501222);民航局科技项目(MHRD20160106);中央高校基本业务经费(3122015L001)
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Ding Kunying and Cheng Taotao  
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      The efficiency of a gas turbine engine is highly dependent upon the clearance between blades and engine case. To control the over-tip leakage, an abradable coating system is sprayed on the case surface. In the high temperature section, a ZrO2-8 wt% Y2O3 (YSZ) coating is usually applied as matrix. Pores in the coating are to enhance their abradability. In this study, poly-p-hydroxybenzoate (PHB) powder was used as a pore-forming material. To avoid burning loss of PHB during the spraying process, a sol-gel method was utilized to coat a TiO2 shell on the PHB powder surface. The characteristics of the coatings were investigated in this work, such as morphology, porosity, hardness and abradability. The results show that the coated PHB improved the porosity of the YSZ coating, and then decreased the coating hardness. Finally, an abradability test was utilized to exhibit the incursion depth increased with the increase of coating porosity.