▎ 摘　　要

Normal carbon source black carbon was substituted by graphene which was dispersed in N-Methyl-2-pyrrolidone and nanocrystalline WC-Co composite powders were prepared using a short process in-situ reduction and carbonization reaction method. The results show that graphene as the carbon source could decrease the reaction temperature, and the particles of WC-Co composite powders are fine and the particle size distributes uniformly. Composite powders were consolidated through the spark plasma sintering system and the mean grain size of WC in WC-Co cemented carbides is about 290 nm. Vickers hardness and fracture toughness of the bulk is 13.877 +/- 0.131 GPa and 8.3 +/- 0.1 MPa.m(1/2), respectively. HRTEM images show that the grain boundaries of interfaces between WC/WC, WC/Co and WC/C are of low misfit.