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Forming process for super fine crystal and nano crystal coating

A nanocrystalline and ultra-fine crystal technology, applied in coatings, devices for coating liquids on surfaces, and liquid injection devices, etc., can solve the problems of small light spots, damage, and weak bonding force.

Inactive Publication Date: 2002-11-06
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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AI Technical Summary

Problems solved by technology

The surface cladding treatment of laser or electron beam can produce ultra-fine grain coating. The disadvantage of laser and electron beam cladding coating is that due to the small spot, repeated scanning is required, and bridging phenomenon is prone to occur in the cladding process. It is mainly connected by VanderWalls (Vander Holes) force, the bonding force is very weak, and it is easy to damage the surface under the action of external force, resulting in the peeling off of the wear-resistant coating

Method used

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Embodiment Construction

[0012] The specific implementation of the present invention is then described in detail as follows

[0013] (1) Perform conventional pretreatment on the surface to be coated of the substrate;

[0014] (2) After the coating material is processed into a wire rod of a certain diameter or a foil shape of a certain size, it is placed at an appropriate distance from the surface of the substrate to be coated;

[0015] (4) The above-mentioned coating material is passed through an instantaneous large current, and the particles with a scattering speed of 500-3000m / s formed after the electric explosion impact the surface of the substrate to be coated to form an ultra-fine crystal or nanocrystalline coating.

[0016] In the above-mentioned step (2), whether the coating material is used as a wire or a foil, its diameter or thickness must be made into a relatively small size, and its essence is to increase the resistance of the wire or foil material to facilitate electric explosion. Is the...

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Abstract

The forming process of superfine crystal and nanocrystal coating includes the following steps: conventional cleaning treatment of the surface to be coated; setting the wire or foil of the coating material before the surface in proper distance; and passing instantaneous large current via the wire of foil to produce electric explosion so as to form flying particle of coating material at the speed of 500-3000 m / s and to form uperfine crystal and nanocrystal coating. The present invention has the obvious advantages of high strnegth between the coating and the substrate surface owing to the metallurgical combination and mass diffusion of the high-speed fluid, long service life of the coated part, controllable coating thickness, low cost and no environmental pollution. The present process may be used in preparing wear resistant, anticorrosive and antioxidant coating and the coating material may be any conducting material.

Description

Technical field: [0001] The invention relates to the technical field of surface engineering, in particular to a coating process for coating ultrafine crystals or nanocrystals on the surface of a substrate. technical background: [0002] Surface engineering technology is to use various surface coatings and modification technologies to obtain properties and functions that the substrate does not have but expect to have with a small amount of film material. It can significantly improve the corrosion resistance, high temperature resistance, and oxidation resistance of the material surface. , Wear resistance, thereby significantly improving the service life of components. [0003] Wear, fracture and corrosion are the three main forms of material damage. According to statistics, among the parts used in various industrial sectors in our country, those that must be repaired due to wear and tear account for more than 60% of the total number of parts. The economic losses caused by wea...

Claims

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Application Information

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IPC IPC(8): B05B7/16B05D1/02B05D1/08B05D3/00
Inventor 刘宗德杨昆
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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