Carbon nano tube-containing coating material and preparation method thereof

Abstract

The invention relates to a carbon nano tube-containing coating material and a preparation method thereof, and belongs to the technical field of coatings. In the material, a transition layer is a layerof pure carbon nano tube array which is perpendicular to a substrate and a coating, and is positioned between the substrate and the coating; plasma surface modification is adopted for tying the end,close to the coating, of the pure carbon nano tube into a knot; and quantity content of double-wall carbon nano tubes is 60% or more, and length of the double-wall carbon nano tubes is 1nm-1000nm. Anelectron beam deposition method is adopted for preparing a catalysis layer on the surface of the substrate; a catalytic cracking method is adopted for vertically growing a layer of pure carbon nano tube arrays on the surface of the substrate with the catalysis layer, and after plasma surface modification treatment, the coating is prepared on the transition layer, so that the material is obtained.Due to the nano engaging and adhering mechanism of the carbon nano tubes, the bonding strength of the substrate and the coating can be effectively improved, and the carbon nano tube layer is loose inarrangement and good in flexibility, and is an effective stress release layer when the coating and the substrate are heated and cooled, so that the cracking problem caused by thermal expansion coefficient difference between the coating and the substrate is solved.

Description

technical field [0001] The invention relates to a coating material containing carbon nanotubes and a preparation method thereof, belonging to the technical field of coatings. Background technique [0002] Coating technology belongs to the material surface engineering technology, which is to endow the material surface with special properties through some physical or chemical means without changing the composition of the base material and without weakening the strength of the base material, so as to meet engineering needs or improve parts. The useful life of the material. There are many kinds of coatings, which can be divided into: wear-resistant coatings, heat-resistant and anti-oxidation coatings, electrical conductivity and resistance coatings, corrosion-resistant coatings and anti-tritium penetration coatings according to the functions and uses of coatings. [0003] For coatings used at high temperatures (such as heat-resistant and anti-oxidation coatings) or coatings pre...

AI Technical Summary

Problems solved by technology

However, this type of transition layer has the following disadvantages: 1) There is still a difference in thermal expansion coefficient between the transition layer and the coating and the substrate, which cannot fundamentally solve the problem of coating cracking; 2) For coating materials with a large difference in thermal expansion coefficient from the substrate material, Such as diamond coating (thermal expansion coefficient is about 1.1×10 -6 / °C) and 316L steel substrate (the coefficient of thermal expansion is about 16.5×10 -6 / °C), the difference between the thermal expansion coefficients of the two is about 16 times, and the single-layer transition layer cannot solve the problem of thermal expansion coefficient mismatch between the coating and the substrate, while the multi-layer transition layer has the bonding strength of the transition layer and the multi-layer transition layer Many problems such as design and preparation increase the cost; 3) The scope of application of the transition layer is narrow, and different coatings and substrate materials require different components and types of transition layers to be selected