Thermal spray is a technology of coating: metallic, cermet, ceramic and plastic, which has been used in many industries.
The main methods of Thermal spray include:
- the flame spraying using powder / wire (CPS / CWS combustion powder / wire spraying)
- the twin wire arc spraying (TWAS)
- plasma spraying
- High Velocity Oxy-Fuel spraying (HVOF)
PROPERTIES of Thermal spray coatings:
- high wear resistance (adhesive, abrasive)
- high resistance to erosive wear
- high corrosion resistance
- heat resistance
- thermal shock resistance
BENEFITS OF Thermal spray coatings:
- elimination of corrosion
- reducing of wear
- reducing of erosion
- reducing of exploitation costs
MATERIALS USED FOR Thermal spray COATINGS:
- Powders
- pure metals Al, Cu, Mo, Ni
- ferrous metal (carbon steel, stainless steel), nickel (NiCrAl, NiCrSiB, NiCrAlY) aluminum, copper (bronze, brass), cobalt (CoNiCrAlY)
- carbides: Cr3C2-NiCr, WC-Co, TiC, Mo2C
- ceramics: Al2O3, Cr2O3, ZrO2
- cermets: Al- Al2O3
WIRES
- pure metals: Al, Zn, Mo
- alloys of Fe, Ni, SnSbCu
- cored wires containing ceramic particles of Al-Al2O3, Fe-Ci, Ni-WC
EXAMPLES OF COATINGS APPLICATIONS:
POWER ENGINEERING
- boilers tubes
- superheater tubes
- blades of steam turbines
- coal feeders
- hydraulic components
- valves
- cyclones
- separators
- diffusers
OIL & GAS
- impellers
- steering turbomachinery
- impellers for pumps
- compressors
- flow channels
- distribution valves
- hydraulics
- tubes
METALLURGY, FOUNDRY, METAL INDUSTRY
- rollers
- pump components
- steam nozzles
- spray nozzles
- bearings
- rings
- cylinders
- surfaces exposed to high temperatures
- surfaces exposed to the liquid metal
Arms industry and aviation
- protection of machine parts, equipment exposed to corrosion and abrasion
MINING
- rollers
- teeth chargers
- feeders
- blades
- mills
- crushers
