Metco 68F-NS-1 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. The alloy has a composition similar to Tribaloy T-800. 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.
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.
5.1 g/cm³ at 20 °C
Particle size rangedrange
10 - 45 µm
Max service temperatureTmax
1230 - 1600 °C
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.
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.
For oxidation temperatures, up to 980 °C (1800 °F) Metco 68F-NS-1 is one of the best choices because of its high chromium content. All of the Cobalt Molybdenum Chromium Silicon Tribaloy Alloy Powders 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.
5 lb (approx. 2.25 kg)
Atmospheric Plasma Spray
Safety data sheet
www.oerlikon.com/metco SDS No. 50-320
This material data has been provided by Metco.