▎ 摘　　要

NOVELTY - Preparing graphene includes multi-phase toughened silicon carbide ceramic comprises e.g. mixing silicon carbide powder, alumina particles, silicon carbide powder, carbon black powder, polyvinyl alcohol and graphene powder, ball milling and mixing, adding powder water, mixing uniformly to obtain slurry, injecting into vacuum pressure tank to process, placing processed slurry in the mold, pressing to obtain billet, drying, placing the dried blank into vacuum sintering furnace, sintering, reducing temperature, taking out, and baking finished product through series of post-processing. USE - The method is useful for preparing graphene includes multi-phase toughened silicon carbide ceramic (claimed). ADVANTAGE - The toughened silicon carbide ceramic: has higher toughening effect than toughening of single alumina particles and higher graphene toughening effect than the average ceramic materials; lowers production costs. DETAILED DESCRIPTION - Preparing graphene includes multi-phase toughened silicon carbide ceramic comprises (i) mixing 4-6 wt.% silicon carbide powder (particle size is 1-10 mu m, purity is greater than 99%), 3-10 wt.% alumina particles (particle size is 0.1-2 mu m), 65-80 wt.% silicon carbide powder (particle size is 20-80 mu m and purity is more than 99%), 1-2 wt.% carbon black powder, 0.2-0.6 wt.% polyvinyl alcohol (concentration is 55-70%) and 2-12 wt.% graphene powder (particle size is 2-10 mu m), ball milling and mixing, adding powder 20-35% mass water, mixing uniformly to obtain slurry, injecting into vacuum pressure tank to process under 0.01-1 MPa injection pressure, placing processed slurry in the mold, pressing to obtain billet, drying in oven at 70-90 degrees C, placing the dried blank into vacuum sintering furnace, under 0.01-0.1 MPa furnace pressure, raising furnace temperature at 4-8 degrees C/minute speed to 1200-2000 degrees C, maintaining temperature for 1-4 hours, reducing the temperature to 100-200 degrees C, taking out, and baking finished product through a series of post-processing to obtain the finished product.