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Optimization of Preparation Process of Solution Precursor Plasma Spraying for SrZrO3 Thermal Barrier Coating |
Xinhui LI1,2,Wen MA1,2(),Yichuan YIN1,2,Bole MA1,2,Yu BAI1,2,Ruiling JIA1,2,Hongying DONG2,3 |
1 School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China 2 Inner Mongolia Key Laboratory of Thin Film and Coatings Technology, Inner Mongolia University of Technology,Hohhot 010051, China 3 School of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China |
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Abstract SrZrO3 thermal barrier coating was prepared by solution precursor plasma spraying (SPPS). Corresponding to Taguchi method, the relevant processing parameters were optimized in terms of the deposition efficiency, microhardness, microstructure and phase stability of the prepared coatings. The phase constitutes, microstructure and microhardness of the coatings were characterized by XRD, SEM and a microhardness tester, respectively. The experimental results showed that, in the case that the spray distance, feedstock flow rate and atomization pressure are given, the optimized spray parameters were set as follows: arc current, 600 A; argon flow rate, 40 L/min; hydrogen flow rate, 10 L/min. The SrZrO3 coating prepared with the optimized spray parameters had a single-pass coating thickness of 6.0 μm, porosity of 16.3%, and microhardness of 6.8 GPa. The results of phase stability analysis indicated that, the phase transition from t-ZrO2 to m-ZrO2 in the SrZrO3 coating emerged gradually at 1450 ℃ with increasing time, while the SrZrO3 phase did not change.
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Received: 18 September 2016
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Fund: Supported by National Natural Science Foundation of China (51462026 and 51672136) and Inner Mongolia Natural Science Foundation (2014MS0509) |
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