Plasma spraying

In a plasma spray gun a plasma gas is ionized between an anode and a cathode. The plasma reaches temperatures between 15,000 and 20,000°C. A coating powder is injected into the plasma jet by a carrier gas, where it melts before depositing on the substrate, the object requiring the coating. The powder particles fuse together on the substrate forming a protective coating.

Plasma Spraying2

Because of the high temperature it is possible to spray virtually all existing materials and alloys. Plasma spraying is particularly suitable for materials with a high melting point such as ceramic materials.

Benefits

  • Fine micro structure
  • Low porosity
  • Excellent corrosion resistance
  • High process flexibility
  • Good tensile strength
  • Versatile and comprehensive range of materials
  • High production capacity with low costs

Typical coatings

  • Ceramic materials (oxides)
  • Cermets, Carbides (hard metals)
  • Metals and alloys
  • Almost all sprayable materials

Application

  • Hydraulic piston rods, as protection against sea-water environment
  • Ceramics for sealing moving surfaces to prevent seals from leaking
  • Repairs or dimension corrections of worn drive shafts or bearing seatings
  • Thermal barrier coatings (TBCs) in gas turbines

 

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