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Effect of scandia content on the thermal shock behavior of SYSZ thermal sprayed barrier coatings
Affiliation:1. Department of Materials Engineering, Malek Ashtar University of Technology, P.O. Box 83145/115, Shahin Shahr, Isfahan, Iran;2. Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;1. State Key Laboratory for Mechanical Behaviour of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China;2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, People’s Republic of China;1. Department of Materials Engineering, Malek-Ashtar University of Technology, Shahinshahr, Isfahan, Iran;1. State Key Laboratory of Solidification Processing, Carbon/Carbon Composites Research Center, Northwestern Polytechnical Univerisity, Xi׳an 710072, China;2. Applied Physics Institute, TEDA College, Nankai University, Tianjin 753000, China
Abstract:Nanostructured 4SYSZ (scandia (3.5 mol%) yttria (0.5 mol%) stabilized zirconia) and 5.5 SYSZ (5 mol% scandia and 0.5 mol% yttria) thermal barrier coatings (TBCs) were deposited on nickel-based superalloy using NiCrAlY as the bond coat by plasma spraying process. The thermal shock response of both as-sprayed TBCs was investigated at 1000 °C. Experimental results indicated that the nanostructured 5.5SYSZ TBCs have better thermal shock performance in contrast to 4SYSZ TBCs due to their higher tetragonal phase content and higher fracture toughness of this coating
Keywords:Thermal shock resistance  Atmospheric plasma spraying  Nanostructured thermal barrier coatings
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