In thermal power plants, pulverized coal transportation and desulfurization and dust removal systems are powered by fans. The high-speed rotation of the fans causes relative movement of the dust-containing two-phase particles and the relative motion of them. Among them, the hard two-phase particles collide with the fan blades and the relative movement causes the impact Corrosion and abrasion. In the past, thermal power companies generally used traditional wear-resistant methods such as wear-resistant surfacing, thermal spraying, etc., which had unsatisfactory results. Now alumina ceramic sheets are applied to fan impellers. Because the alumina ceramic patch has good wear resistance, light weight and convenient construction, the total weight of the impeller is reduced and the service life of the main bearing of the fan is increased.