Dispersion method of special carbon material for high energy beam surface coating technology

Abstract

The present invention provides a special carbon material dispersion method for high energy beam surface coating technology, comprising the following steps: step 1: pre-dispersion of carbon material; step 2: preparation of carbon material and metal matrix composite powder; step 3: carbon material secondary dispersion. The present invention utilizes the multiple effects of anionic surfactant, magnetic stirring, ultrasonic vibration and wet ball milling to efficiently pre-disperse graphene through the combination of physical adsorption, mechanical stirring and dynamic drying method, so as to achieve full contact between graphene and metal powder, reduce The purpose of the agglomeration of graphene in the metal powder and the floating of graphene during the drying process, the cladding layer prepared by the present invention has good forming quality, no defects such as inclusion pores, and forms a good metallurgical bond with the substrate, and the friction reduction and resistance of the coating Grinding performance is greatly improved. The process of the method is simple and easy to implement, low in cost and easy to realize automation, and the whole process has the advantages of safety, high efficiency, no pollution and low cost.

Description

technical field [0001] The invention relates to a method for dispersing carbon materials, in particular to a method for dispersing special carbon materials for high-energy beam surface coating technology, and belongs to the field of surface engineering. Background technique [0002] In recent years, the research on carbon materials used as reinforcing phases to prepare metal matrix composites has become more and more extensive, among which the research on carbon fibers, carbon nanotubes and graphene is the mainstream. Because carbon materials have high strength, high modulus, low density, small thermal expansion coefficient, good thermal and electrical conductivity, etc., they can be used as functional materials in electroplating, electroless plating and other cold processing fields to prepare electrode materials, hydrogen evolution materials, etc. With the help of its fine-grain strengthening, dislocation strengthening and stress dispersion effects, carbon materials can be ...

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Problems solved by technology

[0004] Although the research on carbon materials used in metal matrix composites is very hot, the mixing of metal powders and carbon materials has become a research difficulty because carbon materials are easy to agglomerate and difficult to disperse.

In some research reports, ball milling is used to dry-mix the mixed powder for a long time, which mainly uses high-energy input to repeatedly deform, cold-weld and crush the metal powder to achieve the purpose of dispersing carbon materials, but this method is very easy to introduce oxides and other impurities, and cause damage to the intrinsic structure of carbon materials; the method of using mechanical stirring and wet ball milling to obtain carbon material / metal-based mixed powders after standing and drying is currently used more, but this method also has shortcomings. The mechanical stirring can not completely disperse the carbon materials, especially the nano-scale graphene and carbon nanotubes, and the static drying method adopted in the later stage will cause the extremely light nano-carbon materials to float to the surface of the mixed powder. Under the action of surface coating technology, it is very easy to cause the carbon material on the surface to be blown away by the protective gas, resulting in the loss of carbon material in the mixed powder. If the situation is mild, it will affect the properties of the prepared coating, and if it is serious, the research will lose the original the meaning of

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