A comparison between novel Gd_(2)Zr_(2)O_(7)and Gd_(2)Zr_(2)O_(7)/YSZ thermal barrier coatings fabricated by plasma spray-physical vapor deposition

作     者：Ren-Bo Zhu Jian-Peng Zou Jie Mao Zi-Qian Deng Xiao-Feng Zhang Chun-Ming Deng Min Liu Ren-Bo Zhu;Jian-Peng Zou;Jie Mao;Zi-Qian Deng;Xiao-Feng Zhang;Chun-Ming Deng;Min Liu

作者机构：School of Materials Science and EngineeringUniversity of New South WalesSydneyNSW2052Australia State Key Laboratory of Powder MetallurgyCentral South UniversityChangsha410083China National Engineering Laboratory for Modern Materials Surface Engineering Technology and Key Laboratory of Guangdong for Modern Surface Engineering TechnologyGuangdong Institute of New MaterialsGuangzhou510651China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2021年第40卷第8期

页      面：2244-2253页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the National Key Research and Development Program of China(No.2017YFB0306100) the National Natural Science Foundation of China(No.51771059) the Natural Science Foundation of Hunan Province(No.2018JJ2524) the International Scientific Technological Cooperation Projects of China(Nos.2015DFR50580 and 2013DFA31440) the Science and Technology Planning Project of Guangdong Province(No.2017A070701027) 

主　　题：Plasma spray-physical vapor deposition Thermal barrier coatings Gd_(2)Zr_(2)O_(7) Thermal shock resistance Adhesion strength 

摘      要：Spherical Gd_(2)Zr_(2)O_(7)hollow powders with a mean size of 8.8μm were fabricated as feedstock for thermal barrier coatings(TBCs)by *** single-ceramic-layer(SCL)Gd_(2)Zr_(2)O_(7)TBCs and double-ceramic-layer(DCL)Gd_(2)Zr_(2)O_(7)/YSZ TBCs with quasicolumnar structure were successfully fabricated by plasma spray-physical vapor deposition(PS-PVD).Tensile and water-quenching tests were applied to evaluate TBCs *** results show that adhesion strength of SCL Gd_(2)Zr_(2)O_(7)TBCs and DCL Gd_(2)Zr_(2)O_(7)/YSZ TBCs is36.5 MPa and 15.4 MPa,*** delamination of SCL Gd_(2)Zr_(2)O_(7)TBCs and DCL Gd_(2)Zr_(2)O_(7)/YSZ TBCs in the tensile test takes place at the middle and bottom of Gd_(2)Zr_(2)O_(7)layer,respectively,due to relatively lower fracture toughness of Gd_(2)Zr_(2)O_(7)*** 40 cycles of water-quenching test,DCL Gd_(2)Zr_(2)O_(7)/YSZ TBC surface keeps relatively intact,while SCL Gd_(2)Zr_(2)O_(7)TBC surface shows 20%visible destroyed regions,which demonstrates that DCL Gd_(2)Zr_(2)O_(7)/YSZ TBCs have a better thermal shock resistance than SCL Gd_(2)Zr_(2)O_(7)*** cracks in the SCL system propagate near thermally grown oxide(TGO)due to thermal mismatch and TGO growing stress,while cracks in the DCL system propagate in the Gd_(2)Zr_(2)O_(7)layer due to its relatively lower fracture toughness.