Phase transition and interface evolution of Al2O3/ZrO2 particles in plasma-sprayed coatings |
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| Affiliation: | 1. School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China;2. Tianjin Key Laboratory of Advanced Fibers and Energy Storage, Tianjin 300387, China;1. Henan Province Industrial Technology Research Institute of Resources and Materials, Zhengzhou University, Zhengzhou, 450001, China;2. State Key Laboratory of Special Rare Metal Materials, Northwest Rare Metal Materials Research Institute, Shizuishan, 753000, China;3. College of Sciences, Xi''an Shiyou University, Xi''an, Shaanxi, 710065, People''s Republic of China |
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| Abstract: | Alumina and zirconia ceramic particles exhibit high hardness and excellent wear resistance at high temperature, and hence are used as ceramic reinforcement phases in some plasma sprayed coatings. In this study, the interface evolution of a zirconia/alumina eutectic ceramic and the phase transition of zirconia in a plasma-sprayed coating were investigated. Scanning electron microscopy and transmission electron microscopy combined with focused-ion beam and energy dispersive X-ray were used to analyze the microstructure and composition of the ceramic interface. The results showed that the eutectic ceramic particles consisted of alumina (outer) and columnar zirconia (inner) before and after the plasma spraying process. The inner zirconia part showed the martensitic transformation of t-type zirconia to stripe-like m-type zirconia. After the plasma spraying, the interface between alumina and zirconia changed significantly, which formed a new oxide layer. The phase transition mechanism in the ceramic particle and oxide layer formation mechanism at the alumina/zirconia interface were investigated. |
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| Keywords: | Zirconia Alumina Interface Phase transition Plasma spraying |
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