Tribaloy cobalt-based alloys consist of a hard, intermetallic (Laves) phase dispersed in a softer matrix of eutectic or solid solution. They exhibit outstanding resistance to wear, and galling, high corrosion resistance and are particularly suitable where lubrication is a problem. Wear resistance of Tribaloy alloys is highly dependent on the volume percentage of the Laves phase.
Tribaloy T-900 is a cobalt-based Laves phase-containing alloy with improved crack resistance over traditional Tribaloy T-800. Unlike T-800, which requires a preheat of 1000°F or higher, T-900 can be PTA welded with a preheat of 500°F. ASTM G77 adhesive wear test results indicate that Tribaloy T-900 has similar wear resistance to alloy T-800 under low loads and outperforms T-800 under high loads.
Tribaloy T-900 is most effective in applications where corrosion or high-temperature wear resistance is needed. It has been used in a range of applications, including bleed valves on commercial aircraft engines, wedge valves, and seat rings.
Areas of application where Tribaloy alloys are used:
- Metal-to-metal wear
- Surfaces that cannot be lubricated (e.g. high temperatures)
- Lubrication starvation
- Fluid lubricant is of low viscosity
- Both wear and corrosion are factors
Available Product Forms
Tribaloy T-900 is available as finished castings, powder metallurgy components, rod and powder.