▎ 摘　　要

NOVELTY - High-toughness boron carbide-titanium boride-graphene compound ceramic comprises 0.5-6 wt.% graphene and 9.5-24 wt.% titanium boride uniformly distributed in the boron carbide substrate. USE - The ceramic is useful for automobile engine, heat-resistant component and wear-resistant component. ADVANTAGE - The ceramic has relative density of 98.67-99.43%, Vickers hardness of 31.87-32.56 GPa, bending strength of 485-593 MPa, fracture toughness of 4.65-8.19 MPa.m1/2 , conductivity of 4.37-7.14x 105 S/m and excellent comprehensive performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the ceramic, comprising (1) taking the above mentioned raw materials, (2) adding the graphene powder to absolute ethanol and ultrasonically dispersing it for 1-2 hours to obtain uniformly dispersed graphene dispersion, (3) adding boron carbide powder and titanium boride powder to the graphene dispersion obtained in the step (2), ultrasonically dispersing while mechanically stirring to obtain boron carbide-titanium boride-graphene mixture, and (4) subjecting the boron carbide-titanium boride-graphene mixture obtained in the step (3) to high-energy planetary ball milling, drying and sieving, obtaining uniformly mixed boron carbide-titanium boride-graphene compound ceramic powder, sintering the obtained boron carbide-titanium boride-graphene compound ceramic powder in hot pressing furnace.