Powder High Chromium Alloyed

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. This alloy has a composition similar to Tribaloy T-800. It is metallurgically different 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. This powder is sized for application using atmospheric plasma spray or combustion powder spray and will have a lower macrohardness, microhardness, bond strength and apply with lower deposit efficiencies compared to their HVOF-applied counterpart. Coating properties depend strongly on the volume percentage of Laves phases. Subsequent heat treatment (annealing) at high-temperatures improves coating properties substantially. Coatings of this material offers 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. The higher chromium content of Metco 68F-NS-1 increases the temperatures for use of the coating against oxidizing environments compared to coatings of Tribaloy T-400 counterparts.