Preparation method of composite coating for surface of blast-furnace tuyere made of red copper material

The invention discloses a preparation method of a composite coating for the surface of a red copper blast-furnace tuyere. The preparation method comprises the following steps: S1, weighing Incone625 nickel-based powder and tungsten carbide powder; s2, screening the particle sizes of the powder; s3, the powder is dried, and the surface of the workpiece to be cladded is treated to form a surface to be cladded; s4, the Inconel 625 nickel-based powder dried in the step S3 is subjected to laser cladding on the to-be-cladded face to form an Inconel 625 cladding layer, finish machining is conducted after cladding is completed, and a laser cladding workpiece is obtained; s5, the tungsten carbide powder dried in the S3 is sprayed to the to-be-sprayed face of the laser cladding workpiece through hypersonic flame, so that a tungsten carbide ceramic particle layer is formed; and S6, after spraying is completed, laser remelting is conducted. According to the method, the compact ceramic coating is prepared on the copper ba