Abstract No.:	2921
Scheduled at:	Thursday, September 29, 2011, Saal A 3:15 PM Aviation Industry 4
Title:	Phase stability and thermal conductivity of plasma sprayed scandia, yttria-stabilized zirconia TBCs
Authors:	Qilian Li / Avic Aeronautical Manufacturing Technology Institute, P.R. China Shuili Gong / Beijing Aeronautical Manufacturing Technology Research Institute, China Huaifei Liu/ Beijing Aeronautical Manufacturing Technology Research Institute, China Weihua Yang/ Beijing Aeronautical Manufacturing Technology Research Institute, China Shuqing Li*/ Beijing Aeronautical Manufacturing Technology Research Institute, China
Abstract:	Zirconia stabilized with a combination of scandia and yttria (ScYSZ) powder for plasma spraying was synthesized by chemical co-precipitation process in the experiment, and the ScYSZ powder contains 7.0mol% scandia and 1.5mol % yttria. The microstructure, phase stability and thermal conductivity of plasma sprayed ScYSZ thermal barrier coatings (TBCs) were investigated. The results revealed that the ScYSZ TBCs had excellent stability to retain single metastable tetragonal t' phase even after high temperature (1500) exposure for 300 hours and did not undergo a tetragonal-to-monoclinic phase transition upon cooling. Furthermore, the ScYSZ TBCs had lower thermal conductivity than 3.5-4.5mol% yttria stabilized zirconia TBCs currently used in aviation industry.ScYSZ TBCs could be developed as a novel TBCs for advanced gas turbine engines.

<= go back