The Effect of Particle Type and Size on CoCr Surface Properties by Fine-Particle Shot Peening

Cobalt–chromium (CoCr) alloy is widely used for medical implants such as dental or joint replacements because of its strength and high corrosion resistance. By throwing a spherical media against material surface, fine-particle shot peening can modify surface properties and, result, has been low-cost simple method to increase metal’s wear However, no recent literature reported the effect particle type size on CoCr alloys. This study examined two different types (ceramic (alumina–zirconia composites) silica (SiO2)) three sizes determine their effects CoCr’s after peening. The properties, including morphology, roughness, hardness, residual stress, cytotoxicity, were tested evaluate process. larger higher hardness (ceramic) changed microstructure more than particles with smaller lower (silica). results cytotoxicity test showed that did not affect cell viability, an important fact when considering potential use implants. improve several ceramic offers best results.