Cermet usually sold as 75 percent Cr3C2 with 25 percent nickel-chromium binder, applied by HVOF, HVAF or plasma. It is softer than tungsten carbide, around 800 to 1,000 HV, but resists oxidation and wear up to roughly 850 °C, so it is used for erosion and fretting in hot zones such as boiler tubes, turbine components and hot gas valves.
Spec calls chromium carbide on the hot side, WC-Co would oxidize up there.
Also heard as
- chrome carbide
- CrC-NiCr
- Cr3C2-NiCr
- 75/25
Related terms
WC-Co
Tungsten carbide in a cobalt binder, the most common wear-resistant thermal spray coating.
Carbide
Shop shorthand for a carbide coating, usually tungsten carbide, as in putting carbide on a part.
HVOF
High-velocity oxygen fuel: burning fuel and oxygen under pressure to fire powder at supersonic speed.
HVAF
High-velocity air fuel: an HVOF-style process that burns fuel with compressed air instead of oxygen.