DC Plasma Spraying, Process Technology

DC plasma spraying stands out as one of the most widely used thermal spray techniques for a broad range of applications including tribological and wear resistance, corrosion and/or oxidation resistance, thermal protection, biomedical applications, and the deposition of free-standing spray-formed parts. The technology is based on a simple concept of in-flight melting of the material to be sprayed injected into a plasma stream in the form of fine dispersed powder, solution or suspension, followed by the deposition of the molten droplets on the substrate to be sprayed on which they form splats freezing on impact. The coating is thus formed through the accumulation of successive layer of splats which can grow to hundreds of micrometers thick and more.