Ceramic Coatings
• Ceramics applied by Plasma spray are used for
• Dielectric strength
• Sliding wear
• Thermal barriers
• Corrosion protection
• Typical thickness of 0.1 to 0.7mm
• Hard ceramic coating materials, 60-68 HRC
• Very dense to porous depending on application requirements
• Excellent adhesion
• Can be ground to a 0.4 Ra surface finish, or superfinished to 0.1Ra.
Common Coatings:
• Aluminum Oxide, : Al2O3, Al2O3/ 3TiO2, Al2O3/ 13TiO2, AlO3/40TiO2)
• Chromium Oxide: (Cr2O3 , Cr2O3+TiO2+SiO2) – Highest hardness
• Titania (TiO2)
• TBC : Yttria stabilized Zirconia ( thermal barrier coatings, ZrO2-8% Y2O3)
• Zirconia : (Ca or Mg Zirconium Oxide )