Method for preparing nano diamond composite coating by millisecond laser cladding

Abstract

The invention discloses a method for preparing a nano diamond composite coating by millisecond laser cladding, which comprises the following steps: adding 8-10% of fine-structure microcrystal graphite powder and 2-5% of catalyst powder into nickel-base alloy powder, putting the mixed powder in deionized water, mixing for 15-30 minutes by ultrasonic vibration, and drying; putting the nickel-base alloy workpiece in a vacuum chamber, wherein the vacuum degree is kept at 10<-3>-10<-4> Pa; and uniformly spreading the dried powder on the workpiece surface by an automatic powder delivery device to form a 0.5-2 mm preset layer, focusing a laser on the preset layer surface by a Dd:YAG laser device, and changing the position of the laser light spot relative to the workpiece to finish the cladding of the workpiece in different positions. The nano-diamond-containing composite coating prepared by the method has the advantages of compact structure, high bonding strength with the base, favorable self-lubricating property and favorable wear resistance.

Description

technical field [0001] The invention belongs to the technical field of surface engineering, and particularly refers to a nickel-based alloy powder doped with fine-structure microcrystalline graphite powder and fine-structure catalyst powder by millisecond laser irradiation, and cladding to prepare a composite coating containing nano-diamond and diamond-like components Methods. Background technique [0002] As the dispersed reinforcement phase of composite materials, nano-diamond powder can significantly improve the hardness, wear resistance and chemical stability of metal substrates. Nano-diamond composite coating not only has the characteristics of strong adhesion and good wear resistance of conventional diamond coatings, but also has the characteristics of flat and smooth nano-diamond surface, small friction coefficient and easy grinding and polishing. It has broad application prospects in the field of precision machining . [0003] At present, the methods for preparing ...

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Problems solved by technology

[0004] One of the purposes of the present invention is to solve the problem of high cladding costs caused by the necessity of using nano-diamond powder in the existing preparation technology, and to provide a method of adding fine-structure microcrystalline graphite powder and fine-structure catalyst powder to the alloy powder to form cladding material approach that greatly reduces cladding costs

The second object of the present invention is to solve the problems of slow deposition rate and loose coating structure in the process of preparing nano-diamond composite coating, and provide an efficient, fast and easy method for preparing high-quality nano-diamond composite coating

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