Characterization of Fe-based alloy coating deposited by supersonic plasma spraying |
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| Authors: | Zhong-yu Piao Bin-shi Xu Hai-dou Wang Dong-hui Wen |
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| Affiliation: | 1. Key Laboratory of Special Purpose Equipment and Advanced Processing Technology (Zhejiang University of Technology), Ministry of Education, Hangzhou 310014, China;2. Academy of Armored Forces Engineering, National Key Laboratory for Remanufacturing, Beijing 100072, China |
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| Abstract: | The objective of the present study is to characterize the Fe-based alloy coating deposited by the supersonic plasma spraying process. The condition of the melting particles was in situ monitored. The microstructure of the coating was examined by scanning electron microscope and high resolution transmission electron microscope. The phase composition was examined by X-ray diffraction. The microhardness and porosity were also measured, respectively. Results show the prepared coatings have excellent properties, such as few oxides, high microhardness and a low porosity amount. At the same time, a mass of amorphous/nanocrystalline phases was found in the coating. The mechanism of the formation of amorphous/nanocrystalline phases was investigated. The appropriate material composition of spraying material and flash set process of plasma spraying are the key factors. Moreover, the mechanism for oxidation resistance is also investigated, where the separation between melting metal and oxygen by the formation of SiO2 films is the key factor. |
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| Keywords: | Supersonic plasma spraying Fe-based coating Amorphous/nanocrystalline Oxides |
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