High velocity oxy-fuel coating spraying (HVOF).Several variations of thermal spraying are distinguished: Generally, the coating quality increases with increasing particle velocities. The surface may not heat up significantly, allowing the coating of flammable substances.Ĭoating quality is usually assessed by measuring its porosity, oxide content, macro and micro- hardness, bond strength and surface roughness. Resulting coatings are made by the accumulation of numerous sprayed particles. Combustion or electrical arc discharge is usually used as the source of energy for thermal spraying. They are fed in powder or wire form, heated to a molten or semimolten state and accelerated towards substrates in the form of micrometer-size particles. Coating materials available for thermal spraying include metals, alloys, ceramics, plastics and composites. thickness range is 20 microns to several mm, depending on the process and feedstock), over a large area at high deposition rate as compared to other coating processes such as electroplating, physical and chemical vapor deposition. Thermal spraying can provide thick coatings (approx. The "feedstock" (coating precursor) is heated by electrical (plasma or arc) or chemical means (combustion flame). Thermal spraying techniques are coating processes in which melted (or heated) materials are sprayed onto a surface. Particle temperature and velocity for different thermal spraying processes
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