Thermal Spray Technology
Auxiliary Equipments
Consumables
 
 
 
Coatings for Resistance to Fretting and Surface Fatigue
Coatings resistant to wear caused by repeated sliding, rolling, impacting or vibration. Generally coatings with good toughness and low residual tensile stress are best.
Common Coatings:-
  • Cermets coatings like tungsten carbide/cobalt
  • Chromium carbide/nickel chromium (particularly for high temperatures above 540 C)
  • Fused self fluxing alloys
  • Aluminium bronze
  • Copper nickel indium
  • Various alloys of iron, nickel, chromium or cobalt
Coatings for Resistance to Abrasion
Ideally, the material should have a hardness that is in excess of that of the mating surface or abrasive particles.
Common Coatings:-
  • Cermet coatings like tungsten carbide/cobalt
  • Chromium carbide/nickel chromium (particularly for high temperatures above 540 C)
  • Oxide ceramics like chromium oxide and alumina
  • Fused self fluxing alloys (NiCrSiB)
  • Various hard alloys of iron, nickel, chromium or cobalt
Coatings for Resistance to Erosion
The selection of coating for erosive wear is dependant on the severity and type of erosion. For solid impingement erosion at a shallow angle of attack where the wear is similar to that of abrasion, high hardness coatings are required. For solid impingement angles near 90 coating toughness becomes more important. For cavitation and liquid impingement generally, a coating with good surface fatigue resistance is needed.
Common Coatings:-
  • Cermets coatings like tungsten carbide/cobalt
  • Chromium carbide/nickel chromium (particularly for high temperatures above 540 C)
  • Fused self fluxing alloys
  • Non ferrous alloys, aluminium bronze, monel
  • Oxide ceramics like chromium oxide and alumina
  • Various alloys of iron, nickel, chromium or cobalt
Carbide Hard Coatings for Wear Resistance :-
Typically used to reduce abrasion, fretting, erosion, surface fatigue, and cavitations. Applied by HVOF (preferred) or Plasma Spray.
Common Coatings :-
  • Tungsten Carbide (WC/Co)
  • Chrome Carbide (Cr3C2/NiCr)
Ceramic Thermal Spray Coatings
Ceramics applied by thermal spray are used for Dielectric strength, Sliding wear ,Thermal barriers, Corrosion protection.
Common Coatings :-
  • Alumina (Aluminum Oxide, Al2O3)
  • Zirconia (Zirconium Oxide, ZrO2)
  • Chromium Oxide (Cr2O3)
  • Titania (TiO2)
  • Yttria stabilized Zirconia (YSZ thermal barrier coatings, ZrO2-Y2O3)
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