Interface fracture characteristic and crack propagation investigations of thermal barrier coatings under tensile tests at elevated temperature

作     者：W.G.Mao~((a,b)) C.Y.Dai~((a,b)) Q.X.Liu~((a,b)) L.Yang~((a,b)) Y.C.Zhou~((a,b) (a) Faculty of Materials & Optoelectronics Physics,Xiangtan University,Hunan,411105,China (b) Key Laboratory of Low Dimensional Materials & Application Technology,Ministry of Education,Xiangtan University,Hunan,411105,China 

会议名称：《The Eighth International Conference on Fundamentals of Fracture（ICFF VIII）》

会议日期：2008年

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

关 键 词：thermal barrier coatings tensile test interface fracture toughness crack propagation 

摘      要：Thermal barrier coatings(TBCs) have been extensively used in aircraft engines for improved durability and performance for more than fifteen *** this paper,thermal barrier coating system with plasma sprayed zirconia bonded by a MCrAlY layer to SUS304 stainless steel substrate were performed under tensile tests at 1000℃.The crack nucleation,propagation behavior of the ceramic coatings in as received and oxidized conditions were observed by high- performance camera and discussed in *** relationship of the traverse crack numbers in the ceramic coating and tensile displacement were recorded and used to describe the crack propagation mechanism of thermal barrier *** was found that the fracture/spallation locations of air plasma sprayed thermal barrier coating system mainly lay within the ceramic coating close to the bond coat interface by scanning electron microscope(SEM) and energy dispersive X-Ray(EDX). The energy release rate and interface fracture toughness of plasma-sprayed thermal barrier ceramic coatings were evaluated by the aid of Suo-Hutchinson *** calculations revealed that the energy release rate and fracture toughness ranged,respectively,from 22.15J·m to 37.8J·m and from 0.9MPa·m to 1.5MPa·*** results agree well with other experimental results.