Thermal spraying refers to a series of processes in which finely divided metallic or non-metallic coating materials are deposited in a molten or semi-molten state onto a prepared substrate surface, forming a sprayed deposition layer. The coating materials can be in the form of powder, ribbon, wire, or rod. The thermal spray gun utilizes heat provided by fuel gas, an electric arc, or a plasma arc to heat the thermal spray material to a plastic or molten state. The material is then accelerated by compressed air, forming a constrained stream of particles that impact the substrate surface. Upon impact, the particles deform under pressure, forming overlapping thin sheets that adhere to the prepared substrate surface. As they cool and accumulate, they eventually form a layered coating. Depending on the coating material, this layer can provide functions such as high-temperature corrosion resistance, wear resistance, high-temperature tolerance, insulation, and more.