Cobalt Molybdenum Chromium Silicon (Tribaloy) Alloy Powder (similar to Tribaloy T-800)

Alternative and trade names
similar to Tribaloy T-800 (Tribaloy is a registered trademark of Kennametal Inc.), Diamalloy 3001, Metco 68F-NS-1, Metco 4800
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Diamalloy™ 3001, Metco 68F-NS-1 and Metco 4800 are cobalt alloys containing molybdenum, chromium and silicon. Their good coating properties result from the formation of hard precipitates (cobalt-molybdenum-silicon based intermetallic Laves phases) that are dispersed in a softer cobalt-based alloy matrix. These alloys have compositions similar to Tribaloy T-800. They differ metallurgically from typical cobalt-chromium-tungsten alloys that are hard because of carbides within their structures.

The coatings exhibit unique corrosion resistance, oxidation resistance, excellent abrasive wear resistance and high service temperature capability with good hot hardness. Coatings exhibit a low coefficient of friction particularly suitable where lubrication is low or non-existent.

Diamalloy products are sized for application using HVOF while the Metco products are sized for plasma spray. Metco 4800 is appropriate for both HVOF and plasma spray. Coating properties depend strongly on the volume percentage of Laves phases. Subsequent heat treatment (annealing) at high temperature improves coating properties substantially.

The materials Diamalloy™ 3001, Metco 68F-NS-1 and Metco 4800 of this product family differ primarily in their particle size distribution and are all manufactured via gas atomization.

This material data has been provided by Oerlikon Metco.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

Ashby charts




Particle size range

5.5 - 45 µm

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Diamalloy 3001: -45 +5.5µm, Metco 68F-NS-1: -45 +10µm, Metco 4800: -45 +10µm



Max service temperature

980 °C

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Melting point

1230 - 1600 °C

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Chemical properties



17.5 %

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28.5 %

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3.4 %

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Technological properties

Application areas

Coatings are hard with good corrosion resistance in acidic media and good oxidation resistance in air up to relatively high temperatures. Coatings exhibit excellent galling and wear resistance and even resist fretting with inadequate lubrication. Excellent tribological performance when rubbing against itself, stainless steel, gray cast iron, aluminum, superalloys and hard chromium plated surfaces. Applications include pump components, gas turbine applications to combat fretting, landing gears, ball and roller bearings, sleeve bearings, journal bearings, piston rings, camshafts, high and low pressure nozzles, valve seats, valve faces and exhaust fan blades.



Chemical composition




Handling recommendations

Store in the original container in a dry location; Open containers should be stored in a drying oven below 38°C (100 °F) to prevent moisture pickup; Tumble contents prior to use to prevent segregation.



Order number

Diamalloy 3001: 1000792, Metco 68F-NS-1: 1000568, Metco 4800: 1079452


HVOF-applied coatings of Diamalloy 3001 have higher macrohardness, microhardness, bond strength and apply with higher deposit efficiencies compared to their APS-applied respective counterpart of Metco 68F-NS-1. Metco 4800 can be applied by either HVOF or atmospheric plasma spray. It has a tightly controlled, tailored particle size distribution that offers a unique alternative to the other products discussed above. It is recommended as the preferred choice for new coating applications. For the highest oxidation temperatures, up to 980 °C (1800 °F), Metco 4800, Diamalloy 3001 or Metco 68F-NS-1 are the best choices because of their higher chromium content. All of these materials offer good corrosion resistance in most acidic and saline environments; however, for the best corrosion resistance in these environments with better as-sprayed wear resistance, choose Metco 4800, Diamalloy 3001 or Metco 68F-NS-1.

Packaging size

5 lb (approx. 2.25 kg)

Processing history

Gas Atomized

Processing methods

Diamalloy 3001: HVOF; Metco 68F-NS-1: Atmospheric Plasma Spray; Metco 4800: Atmospheric Plasma Spray, HVOF

Safety data sheet SDS No. 50-320