Enhanced thermal stability and interfacial bonding in laser additively manufactured diamond/CuSn10 grinding tools via W X C/Co-Coated diamond particles

Thermal damage to diamond particles and their weak interfacial bonding with the CuSn10 alloy matrix are still key bottlenecks in the laser additive manufacturing of high-performance abrasives. In this study, a WXC/Co composite layer was innovatively designed and constructed on the diamond surface. It was then homogeneously mixed with a CuSn10 binder, and the composite samples were prepared using the laser powder bed fusion technique. The results showed that the WXC/Co transition layer could be tightly bonded with the diamond and matrix, reduce defects, and inhibit the thermal damage of diamond to a certain extent. Meanwhile, compared with the composites with uncoated diamond (>0.3), the friction coefficient of the composites reinforced by WXC/Co coated diamond was reduced to approximately 0.25, the plane area of the abrasion contour was reduced by 83.9%, the wear mechanism was changed from three-body + adhesive wear to abrasive + adhesive wear, and the grinding precision and grinding efficiency were effectively improved. It is believed that the method developed in this study can be a promising strategy for the design of high-performance diamond reinforced metal-matrix composites with strong interfacial bonding.