▎ 摘　　要

NOVELTY - A graphene-reinforced silicon-boron carbon nitride ceramic composite material contains 90-99 pts. wt. silicon-boron carbon nitride amorphous powder, and 1-10 pts. wt. graphene. Silicon-boron carbon nitride amorphous powder contains silicon powder, graphite, hexagonal boron nitride, silicon element, carbon element and/or boron element. Silicon element and carbon element are used in a molar ratio of 2:(2.5-3.5). Silicon element and boron element are used in a molar ratio of 2:(0.5-1.5). USE - Graphene-reinforced silicon-boron carbon nitride ceramic composite material (claimed). ADVANTAGE - The graphene-reinforced silicon-boron carbon nitride ceramic composite material has excellent strength, toughness, thermal shock resistance and ablation resistance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of graphene-reinforced silicon-boron carbon nitride ceramic composite material, which involves adding silicon powder, graphite and hexagonal boron nitride in a ratio of 20:1:1 to a ball mill, uniformly mixing, ball-milling the mixture with a diameter of 10 mm under argon gas atmosphere and then grinding for 18-22 hours to obtain silicon-boron carbon nitride amorphous powder, adding graphene to the amorphous powder, ball-milling the mixture under an ultrasonic frequency of 20-30 KHz to obtain a mixed powder and then discharging, sintering the mixture at 1800-1900 degrees C under a pressure of 40 MPa, and heat preserving for 3-5 minutes under vacuum.