Vacuum plasma spraying has rapidly established a leading position due to advancements in processing conditions and the resulting improved coating properties:
-High velocity,high enthalpy plasma jet with rapid coating deposition rate.
-Electrical sustrate surface cleaning using the transferred arc(Muehlberger,1982) for excellent coating bond strength.
-High substrate temperature for interfacial diffusion between coating and base material during the coating process.
-Spraying a plurality of parts simultaneously (Gruner,1984) or one after another during the same vacuum cycle.
-The coating composition corresponds to the powder composition(Duvall,1983).In some cases the coating gas content is reduced due to the vacuum melting of powder particles.
Dense,well adherent VPS coatings with optimized compositions suit the base material and service conditions.However the VPS technology has some limitations:
-Only materials available in powder form and with a stable liquid phase can be used to produce coatings.
-The coating process has a directional characteristic of material flow.
-The internal surface spraying is limited by the spray distance.
-The chamber size limits maximum substrate dimensions.
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