Cobalt Molybdenum Chromium Silicon (Tribaloy) Alloy Powder (similar to Tribaloy T-400)

Alternative and trade names
similar to Tribaloy T-400 (Tribaloy is a registered trademark of Kennametal Inc.), Metco 66F-NS, Diamalloy 3002NS
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Diamalloy 3002NS and Metco™ 66F-NS 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-400. 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. 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 3002NS and Metco™ 66F-NS of this product family differ primarily in their particle size distribution and are all manufactured via water 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 3002NS: -45 +5.5µm, Metco 66F-NS: -45 +10µm



Max service temperature

760 °C

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Melting point

1230 - 1600 °C

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Chemical properties



8.5 %

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28.5 %

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2.6 %

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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.


Metco 66F-NS: Stock, Diamalloy 3002NS: Special Order

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

Metco 66F-NS: 1000442, Diamalloy 3002NS: 1000806


HVOF-applied coatings of Diamalloy 3002NS have higher macrohardness, microhardness, bond strength and apply with higher deposit efficiencies compared to their APS-applied respective counterpart of Metco 66F-NS. Good oxidation resistance, up to 760 °C (1400 °F) in air, can be achieved using Diamalloy 3002NS or Metco 66F-NS.

Packaging size

5 lb (approx. 2.25 kg)

Processing history

Water Atomized

Processing methods

Diamalloy 3002NS: HVOF; Metco 66F-NS: Atmospheric Plasma Spray

Safety data sheet SDS No. 50-244