Impermeability of Y_3Al_5O_(12) ceramic against molten glassy calcium-magnesium-alumina-silicate  

作　　者：Zhaolu XUE Yue MA Shengkai GONG Hongbo GUO 

机构地区：[1]School of Materials Science and Engineering,Beihang University,Beijing 100083,China [2]Key Laboratory of High-Temperature Structure Materials and Coatings Technology (Ministry of Industry and Information Technology),Beihang University,Beijing 100083,China

出　　处：《Chinese Journal of Aeronautics》2018年第12期2306-2311,共6页中国航空学报（英文版）

基　　金：sponsored by the National Natural Science Foundation of China(NSFC)No’s.51590894,U1537212,51425102,51231001,51471019,and 51271011

摘　　要：Degradation of thermal barrier coatings(TBCs) caused by calcium-magnesium-aluminasilica(CMAS) glassy penetration is becoming an urgent issue for TBCs industrial applications. In this work, yttrium aluminum garnet(YAlO, YAG) nano-powders were synthesized through a chemical co-precipitation route. The resistance of YAG ceramic to glassy CMAS infiltration at1250 °C was evaluated. YAG ceramic bulk sintered at 1700 °C for 10 h was comprised of a single garnet-type YAlOphase. The molten CMAS glass was suppressed on the surface of the YAG ceramic at 1250 °C. A chemical reaction between YAG and the molten CMAS glass did not occur at 1250 °C for 24 h, suggesting that YAG could act as an impermeable material against glassy CMAS deposits in the TBC field.Degradation of thermal barrier coatings(TBCs) caused by calcium-magnesium-aluminasilica(CMAS) glassy penetration is becoming an urgent issue for TBCs industrial applications. In this work, yttrium aluminum garnet(Y_3Al_5O_(12), YAG) nano-powders were synthesized through a chemical co-precipitation route. The resistance of YAG ceramic to glassy CMAS infiltration at1250 °C was evaluated. YAG ceramic bulk sintered at 1700 °C for 10 h was comprised of a single garnet-type Y_3Al_5O_(12) phase. The molten CMAS glass was suppressed on the surface of the YAG ceramic at 1250 °C. A chemical reaction between YAG and the molten CMAS glass did not occur at 1250 °C for 24 h, suggesting that YAG could act as an impermeable material against glassy CMAS deposits in the TBC field.

关 键 词：Calcium-magnesium-alu mina-silicate(CMAS) Ceramics Thermal barrier coating Yttrium aluminum garnet Zirconia 

分 类 号：V[航空宇航科学技术]