Cobalt-based self-fusing alloys

The category of self-fusing alloys is distinctive because of fusing the coating after it has been sprayed by means of a relatively “cold” process. This happens at a temperature ranging from 1050 to 1200˚C. The fusing temperature is below the melting temperature of the base material.
Because of the high temperature this after-treatment is called fusing, as the sprayed on material is brought to a liquid state and then the sprayed product is cooled in a controlled manner to prevent tearing.
Fusing creates an homogenous coating, comparable to a welded-on layer, but with the difference that it does not mix with the base material.

Cobalt-based self-fusing alloys, also known under the brand name Stellite, are available in a wide range of hardnesses - from relatively soft easy to machine materials to extremely hard wear-resistant alloys. Alloyed with wolfram carbides cobalt-based self-fusing alloys acquire extreme wear resistance. This latter group can only be machined further by means of grinding. Cobalt-based materials are generally used in high-temperature applications because of their high resistance to high-temperature corrosion or wear problems.

Characteristics

  • Metallurgically bonded with the substrate 
  • Resistant against line, impact and point loads 
  • Homogenous and closed structure
  • Often used for high-temperature applications
  • Maximum operating temperature: 840˚C
  • Seawater resistant

Examples

  • Axle bearings/bushes
  • Exhaust valves of combustion engines
  • Thermowells
  • Wearing plates
  • Forging dies
  • Cutters
  • Drawing punches
  • Valves/Cocks/Seatings
  • Conveyor screws / screw pumps
 

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