▎ 摘　　要

NOVELTY - Diamond product with a mixed dimension carbon covalent laminated structure surface layer, comprises a diamond matrix and a mixed dimension carbon covalent laminated structure surface layer. The surface layer of the mixed-dimensional carbon covalent laminated structure sequentially includes a micro-nano-scale near-vertical graphite layer and a graphene layer from inside to the outside. The interfaces of the diamond matrix, the micro-nano-scale near-vertical graphite layer and the graphene layer are connected by continuous carbon-carbon covalent bonds. The angle between the graphite sheet and the surface of the diamond matrix in the micro-nano-scale near-vertical graphite layer is 70-80°. The graphene layer is formed by a multiple graphene sheets. The angle between the graphene sheet in the graphene layer and the surface of the diamond substrate is 0-90°, and the angle between the graphene sheet and the surface of the diamond substrate in the graphene layer is different from 0°. USE - Used as diamond product with mixed dimension carbon covalent laminated structure surface layer. ADVANTAGE - The diamond product achieves a longer lasting anti-friction and anti-wear effect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing diamond product with a mixed-dimensional carbon covalent laminated structure surface layer, comprising irradiating the surface of the diamond matrix with a nanosecond laser, forming an oriented graphite layer in situ on the surface of the diamond matrix, radiating the diamond matrix during the irradiation treatment, where the angle between the heat dissipation direction and the surface to be processed of the diamond matrix is 0-80°, and the angle between the incident direction of the nanosecond laser and the surface to be processed of the diamond matrix is 5 to 80°, the oriented graphite layer sequentially includes an inner graphite layer connected with the diamond matrix through continuous carbon-carbon covalent bonds and an outer graphite layer smoothly transitioned through the inner graphite layer from the inside to the outside, the angle between the graphite sheet in the outer graphite layer and the heat dissipation direction is 70-90°, and the angle between the graphite sheet in the inner graphite layer and the surface of the diamond matrix is 70-80°, the outer graphite layer and part of the inner graphite layer are subjected to mechanical cleavage treatment, so that the outer graphite layer and part of the inner graphite layer are cleaved into a graphene layer formed by a plurality of graphene sheets, and the remaining inner graphite layer forms a micro-nano layer A scale near-vertical graphite layer, on the surface of the micro-nano scale near-vertical graphite layer, transitions to a graphene layer through carbon-carbon covalent bonds to obtain a diamond product with a mixed-dimensional carbon covalent laminated structure surface layer, the angle between the graphene sheet and the surface of the diamond matrix in the graphene layer is independently 0° to 90°, and the angle between the graphene sheet and the surface of the diamond matrix in the graphene layer is not 0°.