Method for preparing nanometer surface coating

Abstract

A disclosed method for preparing a nanometer surface coating comprises the following steps: 1) performing ball milling on a self-propagation reaction metal mixed powder, coating on the surface of a metal plate; 2) igniting the metal mixed powder coating on the surface of the metal plate to make the metal mixed powder coating have a self-propagation reaction; and 3) performing shot blasting on the metal mixed powder coating subjected to the self-propagation reaction, to obtain the nanometer surface coating after the self-propagation reaction and shot blasting are finished. According to the method, shot blasting is performed on the coating after the self-propagation reaction is carried out for a certain time, so that the coating metal powder is increased in diffusion depth in the metal surface, and the bonding force between the coating and the matrix metal is increased; by shot blasting, the density of the coating is improved substantially, and shot blasting has surface nanocrystallization effect; the prepared coating has high density and high viscosity; and the preparation method of the invention is simple in equipment, low in energy consumption and low in cost.

Description

technical field [0001] The invention relates to a method for preparing a nano surface coating, in particular to a method for preparing a nano surface coating with high compactness and high adhesion. Background technique [0002] Using nanotechnology to process metal nano surface coatings on key components such as machinery (such as bearings, gears, springs, etc.), can improve the wear resistance, hardness and life of the equipment. At present, the methods for preparing nano surface coatings are mainly outer coating method and internal diffusion generation method. External coating methods include physical vapor deposition, thermal spraying or plasma spraying, coating methods, etc.; internal diffusion methods include chemical vapor deposition, electrodeposition or electroplating, self-assembly methods, etc. The advantage of the outer coating method is that the process is simple and easy to implement, but the following problems need to be solved: first, the small momentum cann...

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Problems solved by technology

The advantage of the outer coating method is that the process is simple and easy to implement, but the following problems need to be solved: first, the small momentum cannot deposit a dense coating on the surface of the substrate, and it is difficult to spray directly; second, it is necessary to ensure that the nanoparticles do not sinter during the spraying process , to maintain the nanocrystalline structure in the final coating; the third is that the equipment is more complicated and the energy consumption is higher

However, due to the characteristics of the self-propagating high-temperature reaction, even if a certain external pressure is applied when coating the self-propagating reactant, the high density and high adhesion of the coating cannot be ensured.

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