Abrasive Wear Performance of Cr3C2-25%NiCr Coatings by Plasma Spray and CDS Detonation Spray

This work investigates the abrasive wear performance, of thermally sprayed Cr₃C₂-25%NiCr coatings try APS with Ar/H₂, APS with Ar/He and CDS detonation spray against AL₂O₃ and Si0₂-dominaled abrasive papers using a pin-on-disk abrasive tester. The experimental results indicate that the wear resistance of these coatings increases in the order of Cr₃C₂25%NiCr (APS-ArH₂), Cr₃C₂-25%NiCr (APS-Ar/He) and Cr₃C₂-25%NiCr (CDS). The SEM analyses of worn surfaces indicate that the wear mechanisms mainly include abrasion and strain fatigue. Measurements of indentation damage show that the fracture toughness of the three coatings increases just in the same order as wear resistance.