▎ 摘　　要

NOVELTY - A diamond composite sheet comprises 70-75 wt.% cobalt, 2-5 wt.% boron carbide, 3-5 wt.% silver, 0.5-1.5 wt.% silicon and graphene as balance. USE - Diamond composite sheet. ADVANTAGE - The method has low sintering temperature which produces good stability and high quality product. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of diamond composite sheet comprising: (A) taking raw materials, mixing uniformly, putting in furnace at 1300-1350 degrees C for 1-2.5 hours to melt and adding water and graphene powder; (B) placing in three-dimensional mixing machine and uniformly mixing; and (C) sintering and putting in vacuum furnace at 950 degrees C for 3-5 hours to obtain diamond composite sheet.