Effects of h-BN particles on the microstructure and tribological property of self-lubrication CBN abrasive composites

Hexagonal boron nitride (h-BN) particles as solid lubricants were used in metallic cubic boron nitride (CBN) abrasive composites to reduce severe frictions at the tool-workpiece interaction. The microstructural characteristics and mechanical properties of sintered samples with different concentrations of h-BN particles ranging from 5 wt% to 15 wt% were evaluated. Morphological characterisation of the wear plat of balls and scratch surface were performed after the rotating sliding test. Results showed that the micropores and flexural strength rapidly increase as h-BN concentrations increase. The fracture evolution characteristics from trans-granular to inter-granular of CBN abrasives were observed. Samples with high h-BN concentrations possessed small friction coefficients and poor wear-resistance capability.