Thermal spraying refers to a series of processes in which finely dispersed metal or non-metallic coating materials are deposited in a molten or semi-molten state onto a surface of a prepared substrate to form a spray coating. Floor. It uses a heat source (such as electric arc, plasma spray or combustion flame, etc.) to heat a powdered or filamentous metal or non-metal material to a molten or semi-molten state, and then sprays it at a certain speed by means of the flame itself or compressed air. The surface of the pretreated substrate is deposited to form a surface coating with various functions (such as abrasion resistance, high temperature and corrosion resistance).
Thermal spraying has the following characteristics:
1. The base material is not limited, it can be metal and non-metal, and can be sprayed on various base materials;
2. Sprayable coating materials are extremely extensive, and thermal spray technology can be used to spray almost all solid engineering materials such as cemented carbide, ceramics, metals, graphite, etc;
3. The temperature rise of the base material during spraying is small, and no stress or deformation occurs;
4. The operation process is flexible and convenient, and is not limited by the shape of the workpiece, and the construction is convenient;
5. The coating thickness can be from 0.01 to several millimeters;
6. The coating has various properties and can form coatings with various special functions such as abrasion resistance, corrosion resistance, heat insulation, oxidation resistance, insulation, electrical conductivity and radiation protection;
7. Advantages such as strong adaptability and good economic returns;
