Thermal spray coating materials are the “food” of thermal spray techniques and material basis of thermal spraying production. Depending on its different forms, it’s classified as powder, wire, and bar. From its elements it’s mainly divided into: metal alloys, ceramics, composite, polymer four categories; and based on its functions, it’s divided into many categories, such as wear-resisting, corrosion resistant, high temperature resistance, oxidation resistance, heat insulation, seal, absorbing, lubrication, antifriction, anti-skid, insulation, and conductive. And it’s classified as bonding materials and surface materials because of its different operations, or spray materials and weld materials.
We research and use hundreds varieties of thermal spray coating materials, and there are about one hundred kinds of thermal spraying materials have put into use. Superfine tungsten powder, Co-based, Ni-based, Fe-based alloy powder, Al2O3、Al2O3·TiO2、ZrO2·Y2O3、Cr2O3 ceramic powder，reproduced tungsten carbide powder, Ni/Al、WC/Co、NiCr/Cr3C2、Ni/Cg composite powder；Zn、Al、Zn-Al、Fe-based、Ni-based metal wire material, Cr2O3 bar, tungsten carbide powder, superfine tungsten carbide powder are widely used in recent years.
At present, nearly 600 sets imported large thermal spraying equipment are used in china, and it increases at the rate of importing about 40 sets per year. In our country, consuming of all kinds of the thermal spraying material amount up to thousands of tons, and importing materials amount to hundreds of tons per year, high-grade ceramics, alloy, and composite powder are mainly imported.
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