▎ 摘　　要

NOVELTY - The method involves placing alloy substrate raw material into graphite mold for manual pressing, pouring the working layer raw material, putting together in the discharge plasma sintering cavity with 0.5 MPa pressure manual pre-pressing for 1 1min, compacting the powder and then automatically controlling pressure, extracting vacuum or filling protective gas under a certain condition. Placing the pre-composite sheet on the cubic press at 1100-1400 degree Celsius, 4-5GPa lower heat preservation keeping the pressure for 30-180s. Raising the temperature to 1400-1600 degree Celsius and 5-6.5 GPa and pressure heat preservation for 10-30 minutes for secondary sinteration, and finally obtaining the final product. USE - Method for preparing polycrystalline diamond composite sheet. ADVANTAGE - The method optimizes the sintering process and component to adjust the performance of polycrystalline diamond composite sheet, so as to satisfy tool processing and geological exploration and other field performance needs. The interface connection strength of the base and the working layer is higher, the wear resistance is improved by 15 - 30 %, the heat resistance and the graphitization temperature are improved. The method improves the density of working layer and the substrate to a certain degree. The addition of graphene promotes the sliding arrangement between diamond particles with different particle sizes, reduces the gap between the diamond particles, and enhances the abrasion resistance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a polycrystalline diamond composite sheet.