Microstructure and Properties of porous Abradable Alumina Coatings flame-sprayed by Semi-molten Particles

Wednesday, May 13, 2015: 1:20 PM
Room 102B (Long Beach Convention and Entertainment Center)
Prof. Chang-Jiu Li , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Ms. Jiao Zou , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Mr. Hui-Bin Huo , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Prof. Cheng-Xin Li , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Prof. Guan-Jun Yang , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Ms. Jian-Tao Yao , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
High efficiency gas turbine needs high temperature sealing by abradable porous ceramic coatings. In this study, porous Al2O3 coatings was deposited by flame spraying through controlling melting of spray powder particle in a semi-molten state. The effect of melting degree of spray particles changed via spray conditions on coating microstructure and porosity was investigated. The results showed that the melting degree of alumina particles can be changed from 80 down to 30% and thus the coating porosity can be increased from 30% up to about 60%. The standard hardness test yielded no effective data for the porous coatings deposited by spray particles of a melting degree less than 60% for Al2O3 coatings deposited by spray particles with a melting degree higher than 60%. The pin-on-disk abrasion test of Inconel 738 nickel-based superalloy spherical pin of 5 mm in diameter against porous alumina coating was conducted to evaluate the abrada
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