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| Technological Advances in Coatings for Abrasion-cavitation Erosion Protection of Hydraulic Turbine Flow-parts |
| ZHANG Lei1,2, CHEN Xiaoming1,2, WU Yanming1,2, ZHOU Xialiang1,2, ZHAO Jian1, FU Li2, MAO Pengzhan1,2, LIU Wei1
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1 Key Laboratory of Surface Engineering of Equipment for Hydraulic Engineering of Zhejiang Province, Standard & Quality Control Research Institute, Ministry of Water Resources, Hangzhou 310012;
2 Water Machinery and Remanufacturing Technology Engineering Laboratory of Zhejiang Province, Hangzhou Mechanical Research Institute, Ministry of Water Resources, Hangzhou 310012 |
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Abstract The flow-parts of hydraulic turbine in the running process are long time subjected to cavitation erosion and abrasion from the sands in the high-speed flow, resulting in material failure and intense reduction of the operation efficiency, safety and service life of turbine. Coating on the flow-parts is one of the most effective methods to protect the hydraulic turbine from cavitation erosion and sand abrasion. The mechanism of cavitation erosion and sand abrasion, and their influencing factors are briefly explained to provide theoretical basis for the material selection and preparation technologies of coatings. Furthermore, recent research progress in coating technologies of abrasion-cavitation erosion resistance for hydraulic turbine flow-parts is reviewed, the characteristics, existing problems and improved methods of different coatings are discussed, and their development trends in the future are also pointed out.
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Published: 07 May 2018
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2017, Vol. 31 
