▎ 摘　　要

The aim was to study the controllable preparation of graphene-based films on the cemented carbide with different cobalt content. The graphene-based film was deposited on the surface of cemented carbide by homemade chemical vapor deposition. Every film's composition was analyzed by the Raman spectrum, and the influence of the cobalt content and methane flow rate on all kinds of film's formation was studied, and the formation mechanism of the graphene-based film on cemented carbide surface was summarized. Multilayer graphene film or graphene and amorphous carbon mixed film could be generated by regulating the methane flow when the cobalt content of the cemented carbide is 8-20 wt%. The composition, content, and thickness of the graphene-based film are restricted by the methane flow rate and the cobalt's content. Direct growth is the main cause of the formation of graphene coating; the infiltration and precipitation of carbon are the secondary cause.