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4816 |
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Influence of spray distance on the mechanical properties of plasma sprayed La2Zr2O7 and YSZ coatings |
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Guang-Rong Li* / Xi'an Jiaotong University, P.R. China Bo Cheng / State Key Laboratory for Mechanical Behavior of Materials, Xian Jiaotong University, China Guan-Jun Yang/ State Key Laboratory for Mechanical Behavior of Materials, Xian Jiaotong University, China Cheng-Xin Li/ State Key Laboratory for Mechanical Behavior of Materials, Xian Jiaotong University, China Chang-Jiu Li/ State Key Laboratory for Mechanical Behavior of Materials, Xian Jiaotong University, China |
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Double layered ceramic thermal barrier coatings (DLC-TBC) are of great interest due to their high temperature resistance and low thermal conductivity. The development of advanced DLC-TBC need both high performance new ceramic top layer and YSZ layer with excellent mechnical properties. In this study, air plasma spraying (APS) was employed to prepare the LZO and YSZ coatings at different spray distance. The coating mechanical properties (micro-hardness, Young's modulus and fracture toughness) were investigated. Results showed that the mechanical properties followed the Weibull distribution. The coating micro-hardness and Youngs modulus decreased with the increasing of spray distance, while the coating porosity increased. The relationship between the pore structure and mechanical properties are discussed to aim at the futher optimization of processing parameters towards high performance LZO and YSZ coatings for advanced thermal barrier coatings. |