What is the purpose of coating design to understand the properties of the substrate material?

       Different matrix materials have very different properties, and the properties of metal, ceramic and plastic matrix are completely different. Even if they are both metal materials, steel materials and steel, aluminum, titanium and other metal substrates have different properties.

    The performance of the base material is mainly to guide the thermal properties, thermal expansion coefficient, oxidation resistance, etc., which directly affect the performance matching with the selected coating material, the selection of the bonding bottom material and the design of the ladder coating, the pretreatment process and the selection of process parameters, Selection of spraying process and spraying environment atmosphere. For example, when the lead parts are sprayed with ceramic coatings, because the aluminum substrate has the characteristics of good thermal conductivity, soft texture, low melting point, and easy oxidation, finer abrasives, lower air pressure, and more suitable for sandblasting should be used. Large blasting distance and short blasting time to avoid grit embedding. The parameters such as power, spraying distance, workpiece speed and gun moving speed during spraying are quite different from those when spraying the same ceramic coating on the steel substrate.

    Therefore, fully understanding the properties of the matrix material is of great significance for coating design and process parameter selection, and is an important link in thermal spraying construction.