Overview of Thermal Spray Technology update2

       1.2 Thermal spray equipment



Although the equipment varies according to the method of thermal spraying, according to the principle of thermal spraying technology, the equipment is mainly composed of spray gun, heat source, coating material supply device, control system and cooling system.







1.3 Thermal spray materials



At present, the spraying materials that have been industrially produced in practical applications include metals, alloys and ceramics, etc., which are mainly used in the form of powder, wire, and rod, of which spraying powder accounts for more than 70% of the total amount of spraying materials. Materials used as coatings are:







1.3.1 Powder for thermal spraying



Pure metal powder: W, Mo, Al, Cu, Ni, Ti, Ta, Nb, etc.



Alloy powder: Al-Ni, Ni-Cr, Ti-Ni, Ni-Cr-Al, Co-Cr-W, MCrAlY (M=Co, Ni, Fe), Co-based, Ni-based, Fe-based self-fluxing alloys, etc. .



Oxide ceramic powder: Al2O3, ZrO2, Cr2O3, TiO2, etc.



Carbide powder: WC, TiC, Cr3C2, etc.



Cermet powder: WC-Co, Cr3C2-NiCr, etc.



Plastic powder: nylon, polyethylene, polyphenylene sulfide, etc.







1.3.2 Wire for thermal spraying



Al, Cu, Zn, Al-Zn alloy, Babbitt alloy, stainless steel, Ni-Al wire, etc.







1.3.3 Bars for thermal spraying



Al2O3, Cr2O3, ZrO2, etc.







1.4 Thermal spraying process flow



The thermal spraying process is as follows:



Workpiece surface pretreatment → Workpiece preheating → Spraying → Coating post-treatment