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4576 |
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Thursday, May 12, 2016, Room 3G 9:00 AM HVOF- / HVAF-Spraying |
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Microstructure and performance of WC-10Co-4Cr coating with ultrafine / nano-crystalline structures |
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Xuezheng Wang* / Beijing University of Technology, P. R. China Wang Haibin / College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Education Ministry of China, Beijing University of Technology, P. R. China Song Xiaoyan/ College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Education Ministry of China, Beijing University of Technology, P. R. China Liu Xuemei/ College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Education Ministry of China, Beijing University of Technology, P. R. China You Deqiang/ College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Education Ministry of China, Beijing University of Technology, P. R. China Yang Tao/ College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Education Ministry of China, Beijing University of Technology, P. R. China |
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The WC-10Co-4Cr composite powder was synthesized firstly. Then the composite powder was agglomerated to prepare the thermal spraying feedstock. The ultrafine/nanostructured WC-10Co-4Cr coating was prepared by high velocity oxygen fuel (HVOF) thermal spraying. The phase constitution, elemental distribution and microstructure of the coating were characterized by the X-ray diffraction (XRD) and transmission electron microscope (TEM), respectively. The wear resistance and corrosion resistance of the prepared composite coating were tested. The results show that the main phases of the coating include WC, binding phase with partial amorphous structure, with a little W2C and Co(Cr) coexisting. The distributions of Co and Cr elements from the phase boundary to the eutectic area then to Co zone were analyzed quantitatively. The mechanisms for the formation of the microstructure and effects of Cr on the performance of the composite coating are proposed. |