Main advantages and limitations of coatings prepared by thermal spray

       The main advantages of thermal spraying as a method of preparing coatings:



    a. There are more than a dozen thermal spraying methods, which provide a variety of means for preparing coatings.

    b. Wide range of coatings, various types of coatings can be prepared due to the wide range and variety of spraying materials.

    c. The workpiece is not limited to the thermal spraying method, except that spray welding can only be used for metal substrates, it is almost suitable for preparing coatings on the surface of various materials, including inorganic materials such as metals, ceramics, glass, as well as plastics, wood, cloth , paper and other organic materials. And there is no limit to the size of the workpiece, ranging from steel structure bridges to small plug gauges, thermal spraying methods can be used to prepare coatings. During the spraying process, the temperature of the workpiece can be lower than 200 °C, and the substrate does not undergo structural changes and generally does not deform.

    d. The process is simple, the coating is prepared by the general thermal spraying method, the process procedure is few, the operation is simple, and it is easy to move.

    limitation:

    a. Generally, the coating prepared by spraying method has certain limitations on the bonding strength and density of the coating. The bonding strength is much lower than that of metal materials.

    b. For workpieces with a small spray area, the deposition efficiency is low and uneconomical.

    c. The general spraying method has a harsh operating environment and requires labor protection and environmental protection measures.

    d. There are many factors that affect the quality of the coating.

    e. It is difficult to perform non-destructive inspection of Xu layer quality.