Common Applications

• MCrAlY Oxidation and Corrosion Protection Coatings
  • MCrAlY (pronounced ‘emcrawlee’) coatings are used to provide hot corrosion and oxidation protection. MCrAlY coatings are a combination of metal ‘M’ (usually nickel, cobalt, or combination) with chrome ‘Cr’, aluminum ‘Al’ and yttrium ‘Y’ (stabilizer).  MCrAlY coatings form a protective oxide scale on the surface to protect the base metal of the component.  MCrAlY Coatings also often serve as a bond layer for thermal barrier coatings, TBC.
• Thermal Barrier Coatings (TBC)
  • TBC (thermal barrier coatings) are porous ceramic coatings that serve as temperature barrier or insulation to reduce the surface temperature of metal. TBC is primarily made up of zirconia oxide and is usually around 10 to 15 mils thick.  The temperature reduction from the TBC is dependent on part geometry and cooling air but can be estimated to be around 100-150 degrees F.
• Clearance Control Coatings
  • Clearance control coating are coating used to reduce operating clearances between the rotating and stationary components for the turbine. They are often designed to be sacrificial or abradable.  The coating is designed to abrade or wear if contact is made during operation without causing major damage to the component.
• Hard Face Coatings
  • Hard face coatings provide wear resistance from fretting, abrasion and erosion. For IGT components,  chrome carbide and Stellite type materials are the most common hard face coatings used.  Typical IGT applications are at mating faces of combustion components.