The invention relates to a CrTiAlSiN nano composite coating, a cutter deposited with the same and a preparation method thereof. The composite coating comprises a bonding layer, a supporting layer and a main wear layer, wherein the bonding layer consists of Cr, the supporting layer consists of CrN, and the main wear layer is a CrSiN / TiAlSiN nano multilayered composite coating formed by alternating CrSiN layers and TiAlSiN layers or an nc-CrTiAlN / a-Si3N4 nanocrystalline composite coating formed by embedding nanocrystalline CrTiAlN into amorphous Si3N4. The bonding layer is deposited on a cutter matrix, and then the supporting layer and the main wear layer are deposited to obtain the cutter deposited with the coating. The obtained CrTiAlSiN nano composite coating has the advantages of high hardness, low friction coefficient and strong adhesive force; and the cutter deposited with the coating has higher surface hardness, stronger film-matrix adhesive force and good wear-resisting property and high temperature resistance.
The invention discloses a preparation method of a diamondcomposite coating of a micro milling cutter, and relates to the micro milling cutter. The preparation method comprises the following steps of: placing a PCB (Printed Circuit Board) micro milling cutter into a tool and then placing into a deposition reaction chamber; evacuating the deposition reaction chamber, and introducing methane (CH4), hydrogen gas and oxygen gas into the deposition reaction chamber; applying direct-current electric arc to a heating wire which is installed in the deposition reaction chamber, wherein a deposition process in the deposition reaction chamber is divided into five stages including a heating stage, a nucleation stage, a submicrocrystal growth stage, a superfine nanocrystalline growth stage and a final growth stage, different gas-phase deposition conditions are adopted in the five stages, the submicrocrystal growth stage and the superfine nanocrystalline growth stage can be generated in a circulating manner to form a diamond submicrocrystal and superfine nanocrystalline composite coating, and the circulating generation number is N (N is not less than 1). The prepared diamondcomposite coating of the micro milling cutter can be used for keeping the cutting edge to be sharp for a longer time, obviously improving the machining effect, prolonging the service life of the cutter, reducing the cutter changing frequency, improving the machining efficiency and lowering the machining cost.
The invention relates to a graphene-cellulose nanocrystalline heat-conducting film with a bionic structure and preparation thereof. The composite film has a shell-like brick-mud layered structure. A preparation method for the film comprises the following steps: (1) mixing a GO solution with a CNC solution in a certain ratio under stirring, and then successively carrying out coating and drying; and(2) subjecting a film obtained in the step (1) to annealing and reducing at a high temperature to obtain the target product graphene-cellulose nanocrystalline heat-conducting film. Compared with theprior art, the invention has the advantage that the thermal conductivity and electrical conductivity of the graphene film are improved by embedding CNC among layers of graphene through self-assemblingto construct the graphene layered shell-like structure.