Metco™ 66F-NS Cobalt Molybdenum Chromium Silicon (Tribaloy) Alloy Powder

Alternative and trade names
similar to Tribaloy T-400 (Tribaloy is a registered trademark of Kennametal Inc.), Diamalloy 3002NS
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Metco™ 66F-NS is a cobalt alloy containing molybdenum, chromium and silicon. Its 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. This alloy has compositions similar to Tribaloy T-400. It differs 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. Coating properties depend strongly on the volume percentage of Laves phases. Subsequent heat treatment (annealing) at high temperature improves coating properties substantially.

Discover Metco 66F-NS online at myMetco. View current product pricing and availability.

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

10 - 45 µm

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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.



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



Good oxidation resistance, up to 760 °C (1400 °F) in air, can be achieved using Metco 66F-NS.

Packaging size

5 lb (approx. 2.25 kg)

Processing history

Water Atomized

Processing methods

Atmospheric Plasma Spray

Safety data sheet SDS No. 50-244