Surface modified cubic boron nitride powder as well as preparation method and application thereof

The invention belongs to the field of composite material preparation, and discloses surface-modified cubic boron nitride powder as well as a preparation method and application thereof. The method comprises the following steps: mixing cubic boron nitride powder, nano TiO2 powder and C powder, treating the mixture in a vibrating screen with a sieve tray to obtain cubic boron nitride powder coated by mixing the plastically deformed nano TiO2 powder and C powder, and preserving heat at 1250-1350 DEG C in a nitrogen atmosphere to obtain the surface modified cubic boron nitride powder. According to the ceramic composite material prepared from the surface modified cubic boron nitride powder, the bonding strength between a ceramic matrix and cubic boron nitride can be improved, meanwhile, the surface phase change of cubic boron nitride particles can be inhibited, and the mechanical property and wear resistance of the composite material are improved. The surface modified cubic boron nitride powder disclosed by the inv