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采用新型的超音速火焰喷涂(HVOF)技术在水轮机表面喷涂WC-12Co涂层,进行了浆料磨蚀试验来模拟水轮机在真实环境下的磨蚀情况,并分析探讨了其磨蚀失效的机理。结果表明:获得的涂层具有优秀的孔隙率、显微硬度与结合强度,其耐磨蚀性能是基体的3倍以上,能够很好地达到水轮机表面抗磨蚀的要求。而WC-12Co涂层具有优良的耐磨蚀性能的根本原因在于涂层中WC的存在,它使得涂层的显微硬度得到大幅度提高,从而提高了涂层耐磨蚀的性能。
A new type of supersonic flame spraying (HVOF) technology was used to spray WC-12Co coating on the surface of turbine. The slurry erosion test was conducted to simulate the abrasion of turbine in real environment. The mechanism of erosion failure was analyzed. The results show that the obtained coating has excellent porosity, microhardness and bonding strength, and its abrasion resistance is more than 3 times that of the substrate, which can well meet the requirements of anti-abrasion on the turbine surface. However, the fundamental reason why WC-12Co coating has excellent abrasion resistance lies in the presence of WC in the coating, which increases the microhardness of the coating and improves the abrasion resistance of the coating.