HVOF, HVAF
Supersonic thermal spray
Supersonic flame spraying HVAF (High Velocity Air Fuel) and HVOF (High Velocity Oxy-Fuel) are among the most advanced and, in our opinion, the best spraying methods. They enable the production of composite carbide coatings with very high hardness, substrate adhesion, and resistance to wear and corrosion, while maintaining very low porosity. This effective method extends the lifespan of coated surfaces made of steel, copper, or aluminum and is widely used in highly developed countries as an effective method of protection against erosive and abrasive wear under light and medium pressures, direct metal-to-metal friction, or corrosion. The economically justified thickness of layers sprayed by this method for carbide materials is up to 0.3 mm, with a maximum of 0.6 mm, positioning it between PVD processes and cladding. Coatings produced by this spraying process can be ground and polished.
Coating materials
Composites consisting of a metallic matrix such as Co-Cr, NiCr, or others, reinforced with ex-situ carbides like WC, Cr3C2; Inconel and NiCr alloys.
Coating properties
The highest resistance to wear and corrosion among all TS methods, hardness up to 1600 HV, substrate adhesion up to 80 MPa, porosity below 1%. Coating thickness ranges from 0.08 to 0.6 mm.
Aplikacje
Hard-wearing surfaces for draw drums, mixer surfaces, drive rollers, hydraulic cylinder rods, oil distributors, seals, and chutes. Anti-erosion coatings for the airtight walls of power plant boilers and transport pipes.
