基于热扩散重熔技术的水轮机叶片抗磨蚀研究

Research on abrasion resistance of hydraulic turbine blades based on composite surface treatment technology

针对水轮机叶片抗磨蚀问题,采用热扩散重熔技术和封孔技术相结合的复合表面处理技术,获得一种新的高显微硬度、高结合强度和低孔隙率钴铬碳化钨涂层,利用定量金相图谱分析法与普通的超音速火焰喷涂制备的钴铬碳化钨涂层进行抗磨蚀试验对比分析。研究表明,高显微硬度、高结合强度、低孔隙率的新涂层失重量较少,刮削痕迹较为均匀;而普通涂层刮削痕迹集中,涂层破坏严重。通过复合表面处理技术得到的高性能涂层对于叶片的抗磨蚀防护具有非常明显的效果。

In view of the problems of abrasion resistance of turbine blade, the composite surface treatment technology is com-bined with the thermal diffusion remelting technology and sealing technology to obtain a high hardness, new high bonding strength and low porosity of cobalt chromium tungsten carbide coating,and the coating prepared by HVOF is contrasted and analyzed with the ordinary cobalt chromium tungsten carbide coating with abrasion resistence test. The research shows thatthe new coating with high microhardness, high bonding strength and low porosity suffers from less weight loss and more uni-form scraping marks. However,the scratch marks of ordinary coatings are concentrated and the coating is seriously damaged.The high performance coating obtained by composite surface treatment technology has obvious effect on anti-abrasion protec-tion of blade.