Frequently Asked Questions
High velocity oxy-fuel (HVOF) spraying is primarily used to apply high quality
coatings of cermets such as WC/Co and WC/Co/Cr. Coating thickness is usually in the range 0.1-2 mm. Characteristic features of HVOF sprayed coatings include their low level of porosity at about 1-2vol% and low oxide content in the range 1-2wt%. The bond strength often exceeds 80MPa. These coatings can be used across a spectrum of engineering and manufacturing applications to enhance the surface properties of components. This allows preparation of cost effective, high performance parts made from low cost or lightweight materials with a functional surface.
HVOF spraying can produce coatings for:
- Wear protection
- Low friction surfaces
- Corrosion protection
- High temperature oxidation resistance
- Electrical insulation
- Repair and restoration of damaged components
Commonly deposited coating materials include:
- Cermets (e.g. WC/Co, WC/Co/Cr, Cr 3C 2/NiCr, NiCrSiBC)
- Ceramics (e.g. Cr 2O 3, Al 2O 3, ZrO 2)
- Metal alloys (e.g. steels, nickel, chromium and cobalt alloys including NiCrSiB and MCrAlY's)
- Pure metals (e.g. Ni, Cu, Al, Mo, Ti)
- Polymers (e.g. polyester, nylon)
- Composites (e.g. Ni-graphite)
See further information about Materials & Corrosion Management or please contact us.