Method of forming nanostructure on friction surface of metal friction pair and special composition thereof

Abstract

The invention provides a method of forming nanostructure on the friction surfaces of metal friction pairs and a special composition thereof. The method is characterized by that: the special composition is added in a lubricant medium that the metal friction pairs used with the weight ratio of 0.01-2%, under the working condition of the metal friction pairs, the special composition particles are brought to the friction surfaces of the metal friction pairs by the lubricant medium, under the high contact pressure generated from the friction surfaces of the metal friction pairs and the repeated actions of the composite forces composed of extrusion and rolling generated by relative motions between the friction surfaces, the open grain structures on the friction surfaces are allowed to generate strong microscopic plastic deformation repeatedly by the special composition particles, the metal friction pairs run for 1-100 cumulative working hours, so that the nano-structured crystal layer on the respective friction surface of the metal friction pair is online realized respectively, with the particle size of less than 100 nanometer, and the thickness of the nano-structured crystal layer of 2-10 micrometer. The invention has the advantages of extremely simple processing, extremely high production efficiency, low processing cost, no processing energy consumption and the like, is very suitable for large range industrialization and large scale production, having a far-reaching influence on machinery equipment manufacturing industry and mechanical parts processing industry.

Description

Technical field: [0001] The invention relates to the field of metal surface nano-processing, in particular to a method and a special composition for forming a nano-structure on the friction surface of a metal friction pair. Background technique: [0002] The nanometerization of the metal surface refers to the use of various physical or chemical methods to refine the surface grains of the material to the nanometer level, and prepare a nanostructured surface layer with a certain depth, but the matrix still maintains the original coarse grain state, so as to improve and Improve the surface properties of metal materials, such as fatigue strength, stress corrosion resistance and wear resistance. The hardness of the surface layer of the nanostructure on the metal surface is significantly improved, and the hardness of the submicrocrystalline layer below the surface is also significantly increased. It is important to improve the overall performance of the surface of the metal mater...

AI Technical Summary

Problems solved by technology

After investigation, due to the limitations of the existing technology in the realization of metal surface nanometerization due to the need for special processing equipment, complicated processing technology, high production costs, the shape and size of parts and the surface roughness after processing, etc., it is still very difficult. It is difficult to be widely used in practice, and it has not been widely promoted and produced on a large scale in the industry. The reason is that the above-mentioned metal surface nanotechnology has the following deficiencies:

The use of the above metal surface nanotechnology to process parts requires special processing equipment, complex processing technology and professional operating technicians to realize it in an offline state. When processing metal friction parts of reused equipment, the processed parts need to be removed from the equipment. Off-line processing after disassembly has disadvantages such as difficulty in processing, inconvenience, energy consumption and high processing cost, which seriously hinders the industrialization and large-scale production of its technology

[0005] 2. There are certain restrictions on the geometric shape and size of the processing parts, and the nanostructure crystal layer cannot be formed well or cannot be formed on the surface, such as: complex curved surfaces, small-sized inner hole surfaces, etc.

Seriously affect the scope of application of such technologies

[0006] 3. The surface roughness level of some parts treated by nanotechnology is very low, which will offset the effect of nanotechnology and lose the meaning of treatment

thus resulting in less practical