The invention relates to a tool
coating material and a preparation method thereof, and belongs to the technical field of material preparation and application. The material is
a diamond /
diamond-like composite laminated
coating material with super-hard self-lubricating property. The method for preparing the
diamond /
diamond-like composite laminated
coating material is characterized by comprising the following steps of: firstly, pretreating a matrix by using
mixed solution of acid and alkali respectively; secondly, synthesizing diamond with ultrahigh
hardness and good crystalline form on the matrix, which serves as the main body of the
composite coating, by adopting
hot filament chemical vapor deposition; and finally, depositing a high-
hardness diamond-like thin film on the main body of the diamond, which serves as a self-lubricating
surface layer, by using
magnetic filtration cathodic
vacuum arc. In order to improve the
binding force between the
diamond thin film and the matrix and between the diamond-like thin film and the
diamond thin film, a
transition layer is coated between adjacent
layers respectively. The method has the advantages of simple process, precise and controllable synthesis conditions, high film-forming quality, high product yield, low cost, and the like. The obtained diamond / diamond-like composite laminated coating material has ultrahigh
hardness, extremely
low friction factor and extremely low wear rate, shows excellent self-lubricating friction and
wear resistance, and has significance for application of tools or molds under rigorous service conditions.