Thermal coating of metal coating is the research and application of early wear-resistant coating, commonly used metal (Mo, Ni), carbon steel and low alloy steel, stainless steel and Ni-Cr alloy series coating. In general, flame spraying, arc spraying, plasma spraying, HVOF and explosive spraying process are used. The coating has the advantages of high bonding strength with the matrix, good wear resistance and corrosion resistance, and is used for repairing wear parts and machining parts.

The use of aluminum alloy plasma spraying technology on the piston ring, synchronous ring and cylinder and other parts of the spray, the coating has good wear resistance, high bonding strength and excellent adhesion resistance, in the case of lubricating oil has a good condition Anti-bite and anti-scratch performance. High-carbon steel wire, stainless steel (Crl3 type, 18-8 type, etc.) alloy wire is commonly used wear-resistant corrosion resistant coating material [13-15]. With high strength, good wear resistance, a wide range of sources, low prices and so on. NiCr coating has good heat resistance, corrosion resistance and erosion resistance wear performance, can be used as power plant boiler superheater tube and reheater tube protective coating, the use of flame and plasma spraying method can be prepared with different organizational structure NiCr metal wear-resistant coating, coating porosity and high oxide content [16].

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