水轮机纳米WC抗磨蚀陶瓷涂层性能研究及应用

摘要

The problem of flow passage component abrasion of hydro turbine is an important issue to be solved in the construction of hydropower stations in river with high sediment content.The supersonic flame spraying technology and nanometer modification technology are combined to make the nano WC ceramic abrasion resistant coatings on the surface of flow passage components of hydro turbine,and the anti-abrasion performance of coating is tested by grinding,electrochemical and erosion tests.The results show that the micro-hardness,wear resistance and sand erosion resistance of the nano WC ceramic coatings are much better than the substrate,and there is high bond strength between ceramic coating and substrate.The robot simulation coupling technology for achieving good curved surface programming is used in coating spraying for ensuring stable coating performance.The application of this coating in Xinjiang Kalabeili Hydropower Station plays a significant sediment abrasion resistance effect.%解决水轮机过流部件的磨蚀问题是高泥沙含量河流建设水电站的重要课题.采用超音速火焰热喷涂技术与纳米改性技术相结合,在水轮机过流部件基材上制备纳米WC抗磨蚀陶瓷涂层,通过对磨、电化学、冲蚀等试验,检验该涂层性能.结果表明:该纳米WC陶瓷涂层具有远高于基材的显微硬度、耐磨性能以及耐冲蚀性能,与基材之间形成高强度的结合.通过机器人模拟耦合技术实现良好的曲面编程,确保涂层性能的稳定.将其应用到新疆卡拉贝利水电站等高泥沙河流电站的机组过流部件表面,具有显著的抗泥沙磨蚀效果.