Forming process for super fine crystal and nano crystal coating

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...

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