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| Microstructure and erosion resistance of nanostructured WC-10Co4Cr coating sprayed by HVOF |
| ZHOU Xialiang1,2,3, CHEN Xiaoming1,2, WU Yanming1,2, ZHAO Jian1,4, LIU Wei1,4, MAO Pengzhan1,3, WANG Lirong1,3 |
1. Standard & Quality Control Research Institute, Ministry of Water Resources, Hangzhou 310012, China;;
2. Key Laboratory of Research on Hydraulic and Hydro-Power Equipment Surface Engineering Technology of Zhejiang Province, Hangzhou 310012, China;
3. Water Machinery and Remanufacturing Technology Engineering Laboratory of Zhejiang Province, Hangzhou 310012, China;
4. Hangzhou Mechanical Design Research Institute, Ministry of Water Resources, Hangzhou 310012, China |
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Abstract To improve the slurry erosion resistance of turbine surface, nano-structured and micro-structured WC- 10Co4Cr coatings were prepared on stainless steel (0Cr13Ni4Mo) surface by HVOF. Microstructure of powders and coatings with different structure were characterized by scanning electron microscopy (SEM). The micro-hardness, bonding strength and erosion resistance were compared. Erosion failure mechanism in the sandy stream was analyzed as well. The results show that the microstructure of nano-structured WC-10Co4Cr coating prepared by HOVF is dense. Its microhardness and bond strength are higher than that of conventional coating. As well, it is found that nano-structured coating exhibits lower erosion mass loss than that of micro-structure coating. Nano-structure coating has finer grains, higher microhardness and toughness, and better micro-cutting resistance and anti-fatigue spalling properties, and can enhance the slurry erosion resistance of the coating.
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Received: 26 September 2017
Published: 12 July 2019
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2018, Vol. 23 
