Phase Stability, Fracture Toughness and Thermal Cycling Behavior of Supersonic Suspension Plasma Sprayed Scandia-Yttria Co-doped Zirconia Thermal Barrier Coatings

Monday, May 7, 2018: 11:10 AM
Tampa 1 (Gaylord Palms Resort )
Dr. Wei Fan , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Prof. Yu Bai , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Ms. Yongxia Kang , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Dr. Lei Zhang , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Prof. Benqiang Li , Department of Mechanical Engineering, University of Michigan., Dearborn, MI
In this work, one technique named as supersonic suspension plasma spraying (SSPS) is applied to deposit quasi-columnar scandia-yttria co-doped zirconia (ScYSZ) and yttria-stabilized zirconia (YSZ) thermal barrier coatings (TBCs). The phase composition, microstructural evolution, fracture toughness and failure behavior of both TBCs before and after thermal cycling tests at 1300 ˚C were systematically studied. It was found that both as-sprayed TBCs were fully non-transformable tetragonal (t’) phase. After the thermal cycling test, tetragonal (t) phase and cubic (c) phase were formed for YSZ TBC, while single t’ phase was retained for the ScYSZ coating. The fracture toughness of ScYSZ coating was comparable or superior to that of YSZ. AS for the thermal cycling behavior, the lifetime of ScYSZ coating was better than YSZ coating, which confirmed that ScYSZ was a promising alternative material for YSZ.
See more of: TBCs Engineered via Suspensions & Solutions
See more of: Advanced Coatings for the Aerospace Industry (joint symposium with AeroMat)