Microstructure and Wear Performance of CeO2-Modified Micro-Nano Structured WC-CoCr Coatings Sprayed with HVOF

Rare earth elements have been widely utilized in material manufacturing to enhance properties various ways. In order obtain the WC-10Co4Cr coating with uniform distribution of rare earths, CeO2-modified powder was prepared by mixing 1 wt.% nano-sized CeO2 during initial ball-milling fabrication process. Bare and coatings were deposited via high velocity oxygen fuel spraying investigate impact modification on coating’s microstructure, mechanical abrasive wear performance. The results show that addition increased interface energy, inhibiting formation Co3W3C phase sintering process, as well W2C CoCr alloy high-velocity oxy-fuel (HVOF) This led a significantly decreased porosity higher concentration undissolved Cr-rich areas. microhardness fracture toughness 1230 HV0.3 5.77 MPam1/2, respectively. resistance only 70.9% unmodified coating. Due weak cohesive strength between WC Cr, areas preferentially removed, resulting an rate