What factors should be considered when designing coatings by thermal spraying

       Due to the diverse varieties of thermal spray materials and a wide range of applications, how to correctly select thermal spray coatings when designing products and repairing parts is related to the success or failure of the workpiece. Therefore, it is necessary to carefully evaluate the performance of the coating under the working conditions of the workpiece, the physical and chemical properties of the spraying material and the base material, and combine the application technology of the coating with careful experimentation to finally determine it. Evergreen metal thermal spraying mainly considers the following factors:

 (1) Possibility of process method

  For example, in terms of the requirements for the use of components, it is appropriate to spray nickel-based self-fluxing alloys and then perform melting treatment, but due to some reasons (such as thermal deformation of the components, electroplating or protective treatment with organic coatings, the Withstand the melting temperature of the coating, etc.) This process method cannot be used. When selecting the process method, the mechanical processing performance of the spray coating should also be considered. According to the size and shape of the part, consider the mechanical processing, which mechanical processing method to use, and the processing cost.

 (2) Working environment

  Including the stress or impact of the coating during work, the working temperature, the corrosive medium and the corrosive environment, the material and lubrication of the mating and connecting surfaces of the coating and other parts.

 (3) Required coating characteristics

  Including the surface function of the coating, such as surface state, surface finish, chemical properties of the coating, adhesive strength, porosity, hardness of the coating, anti-corrosion performance, wear resistance, friction performance, electrical performance, and heat resistance of the coating And thermal conductivity, coating thickness and finishing performance.

 (4) The characteristics of the base material

  The size and shape of the sprayed part, the surface condition of the sprayed part, the density and quality of the part, the sensitivity of the base material to temperature, the chemical composition, hardness, thermal expansion coefficient of the base material, the stress state in the part, whether the part is before thermal spraying Other surface treatments have been performed.