目的 将表面技术应用于锅炉一次风机叶片的再制造，以大幅地提高叶片的表面性能和延长其使用寿命。方法 以锅炉一次风机叶片的失效机理为依据，制定一次风机叶片再制造的主要工艺过程，采用高速电弧喷涂（HARC）工艺制备了四种颗粒增强金属基复合（MMC）涂层，采用干砂冲蚀磨损试验机对涂层的冲蚀磨损性能进行了研究，对抗冲蚀性能优异的K99A和K99B涂层进行了孔隙率、显微硬度、金相结构等性能试验。结果 在30°和90°两种冲蚀角度下，相比于其他两种涂层，K99A和K99B的冲蚀率较小。K99A和K99B的孔隙率分别为(2.99±0.38)%和(4.30±0.41)%，显微硬度分别为(1110±190)HV0.2和(1160±206)HV0.2，综合比较，K99A涂层具有更好的抗冲蚀磨损性能，且K99A涂层的结合强度>42.3 MPa，满足耐磨涂层要求。结论 采用氩弧焊工艺来修复一次风机叶片，不仅可以恢复其形状和尺寸，而且其强度及韧性可以满足使用要求。高速电弧喷涂K99A涂层表现出良好的抗冲蚀磨损性能，较其他三种MMC涂层提高了20%以上。一次风机叶片再制造费用远低于新叶片费用，且其耐磨性得到提高，展现了极大的经济效益。

Objective To apply surface technology to the remanufacture of primary fan blades of boiler to greatly improve the blades’ surface properties and prolong the service life. Methods Based on the analysis of the failure mechanisms of primary fan blades, main remanufacturing processes of primary fan blades were developed. Four kinds of particle reinforced metal matrix composited (MMC) coatings were deposited by high velocity arc spraying (HARC). Erosion properties of coatings were studied by dry sand erosion test, followed by porosity, microhardness and microstructure tests of K99A and K99B coatings which exhibited better erosion resistance. Results At the erosion angle of 30° and 90°, the erosion rate of K99A and K99B coatings was smaller than that of the other two coatings. The porosity of K99A and K99B coatings were (2.99±0.38)% and (4.30±0.41)%, and the microhardness of them were (1110±190)HV0.2 and (1160±206)HV0.2. By comprehensive comparison, K99A coating exhibited better erosion wear resistance. And the adhesive strength of K99A coating was greater than 42.3 MPa that met the requirements of wear-resistant coatings. Conclusion Argon arc welding is used to repair primary fan blades, which can not only restore their shape and size but also make their strength and toughness meet the service requirements of blades. The K99A coating deposited by HARC possesses the excellent erosion resistance, 20% better compared with the other. the remanufacturing cost of primary fan blades is far lower than that of the new ones, and the wear resistance of the blades after remanufacturing is improved with great economic benefits.