Preparation and property study on PCBN carcass implanted diamond composites

Under the conditions of 5 to 6 GPa, 1400 to 1500℃, holding for 5 minutes, diamond composite material was prepared by mixing cubic boron nitride powder, various binders, and titanium-coated diamond particles. Scanning electron microscopy (SEM), X-ray diffractometer (XRD), energy dispersive spectrometer (EDS) and Raman spectrometer were used to character the microstructure and phase composition, Its wear resistance and microhardness were tested by mechanical tests. Results show that the diamond particles are well distributed in the cubic boron nitride matrix, with well-bonded interface. There are many kinds of carbides and nitrides at the interface, such as TiB₂, TiC, and AlN which makes the material exhibit excellent physical and mechanical properties. The abrasion ratio of the composite is 37.64 times higher than that of traditional material, microhardness greater than 40 GPa, density of more than 97%, and the heat resistant up to 1148℃, which is 28% to 64% higher than traditional PDC composite.