目的 分析聚氨酯弹性涂层的抗磨蚀性机理,并研究其在水利工程表面防护中的应用。 方法对水轮机叶片的气蚀磨损机理进行分析,采用 PU 喷涂技术在水轮机叶片钢材( 0 Cr13 Ni5Mo) 上做一层聚氨酯弹性耐磨涂层,并对涂层的性能进行检测与分析。 结果 当聚氨酯组分的官能度为 2 . 4 时,聚氨酯弹性涂层表现出优异的综合力学性能,涂层与水轮机叶片间的物理结合力达到 12 . 6 MPa,涂层磨耗值保持在较低范围内(2 ~ 3 mg / 1000 r) 。 结论 聚氨酯弹性涂层能减缓含沙水流对水利工程中高速运转机械设备的冲刷磨损、空蚀破坏,延长水轮机叶片、水泵叶轮的使用寿命。

Objective To analyze the abrasion resistance of polyurethane elastic coating and study its application in water conservancy engineering surface protection. Methods The cavitation erosion mechanism of the hydraulic turbine blade was analyzed, then a polyurethane elastomer wear-resistant layer was coated onto the blade of hydraulic turbine(0Cr13Ni5Mo) using the PU spraying technology and the performance of the coating was analyzed. Results When the functionality of polyurethane was 2. 4, the Polyurethane elastomers exhibited good mechanical performance, with the binding force between the coating and the turbine blades reaching up to 12. 6 MPa and the coating wear value remaining at the lower end of the range of 2 ~ 3 mg / 1000 r. Conclusion Elastic polyurethane coating can reduce erosion wear and cavitation damage caused by sediment flow on high-speed operating machine and equipment of water conservancy projects, and thus extends the service life of the pump impeller and turbine blade.