Wear Analysis of Plasma Sprayed Calcium and Strontium Zirconates on Inconel 718

Abstract

CaZrO3and SrZrO3powders were prepared by sol-gel synthesis and plasma sprayed over the Inconel 718 substrate,forming a wear-resistant ceramic coating. X-Ray Diffraction (XRD) analysis of synthesized ceramic powders revealed the presence of CaZrO3and SrZrO3 phases, having an orthorhombic structure. CaZrO3 and SrZrO3powders were sprayed onto the surface of Inconel 718using a plasma spraying process. Scanning Electron Microscope (SEM)analysis of CaZrO3and SrZrO3coated samplesshowedanaveragethickness of about 400μm.Wear depth and wear mechanism for the above sampleswerestudiedusing Pin-on-disc apparatus. Wear results of CaZrO3 and SrZrO3 coated substrates revealed that high wear depths were observed at high speeds and loads. SEM investigations of worn-out samples revealed that both CaZrO3 and SrZrO3 coated samples had undergone delamination wear. CaZrO3 coated samples had exhibitedless delamination and wear depth than SrZrO3 coated samples, thus showing relatively better wear resistance.

Keywords

• Wear-resistant Coatings
• Calcium Zirconate
• Strontium Zirconate
• ceramic coatings
• Sol-gel synthesis
• Atmospheric plasma spraying