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Nanometer structure forming method and special equipment therefor

A nanostructure and special equipment technology, applied in the field of metal surface treatment, can solve problems such as unqualified and difficult to obtain nanostructures

Inactive Publication Date: 2002-02-20
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the traditional shot peening method is that the projectiles used are actually non-circular shapes (such as cylinders), which are approximate circular metal blocks obtained by grinding. Qualified "projectile"
Therefore, it is difficult to obtain a certain depth of nanostructures on the material by using the existing processing methods, for example, the surface layer of nanostructures with a depth of several to tens of microns

Method used

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  • Nanometer structure forming method and special equipment therefor
  • Nanometer structure forming method and special equipment therefor
  • Nanometer structure forming method and special equipment therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Surface treatment on metal parts to obtain a layer of nanostructures, the specific steps are:

[0035] 1) Apply mechanical stress and / or thermal stress to the metal part to be treated; the stress value is less than the yield stress of the metal part material;

[0036] 2) For a defined duration, with a defined velocity, a defined distance, the same impact point, a variable angle of incidence and a limited number of fully spherical projectiles that can be repeatedly used over a long period of time on the entire surface of the metal part to be treated. a spray treatment;

[0037] 3) With the movement of the impact point, step 2) is repeatedly carried out so that the impact point covers all the surfaces to be treated of the metal part;

[0038] Its special equipment: such as figure 1 As shown, in a soundproof cavity 25, including projectiles 22, said projectiles 22 are completely spherical, with a certain size, speed and quantity; also include a container 20, a fixed part...

Embodiment 2

[0055] The difference from Example 1 is:

[0056] When it is desired to obtain a nanostructured surface layer with a thickness of tens to hundreds of microns, the surface treatment of the metal part 10 to be treated in this embodiment is carried out under the state of external mechanical stress.

[0057] like Figure 2A , 2B As shown, the surface of the metal part 10 to be treated in the present invention is in a state of being subjected to external stress, and a fixing member 21 is used to fasten the metal part 10 . Its fixed part 21 is made up of a base plate 21.2, and the pressure plate flange joint 21.1 is installed on the base plate 21.2, and the metal part 10 is close to the protection cushion block 21.3 inserted between the part 10 and the base plate 21.2, and passes through the base plate 21.2 and the cushion block The through hole A21.21 of 21.3 and a rod 21.4 of B21.31 apply a force to the metal part 10 fixed by the flange 21.2. The through hole A21.21 is provided ...

Embodiment 3

[0061] The difference from Example 1 is:

[0062] The present invention is achievable in combination with external mechanical stress and / or heat treatment to achieve the desired results on the surface. In order to facilitate the fragmentation of crystal grains located in the deep layer of the material, the present invention can also adopt the method of applying external mechanical stress and / or increasing the temperature, so that the deep layer of the material is more likely to produce plastic deformation in all directions.

[0063] The implementation results show that:

[0064] Surface processing is carried out on the metal part 10 in the state of no external mechanical stress. The experimental results of the present invention have obtained a nanostructure surface layer with a thickness of 20 μm, and can obtain hundreds of microns (or larger) under the state of external stress and / or heating. thick nanostructured surface layer. It is possible to achieve an increase in the t...

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Abstract

The present invention relates to method of forming nano structure and its special equipment, said method is to proceed surface treatment on metal parts, (1). apply mechanical stress or heat stress on metal parts to be treated; (2). using spherical projectite to proceed jet treatment on whole surface of metal parts to be treated, (3). repeat step 2 to make the impact points cooer all the surface of metal parts to be treated; special equipment includes spherical ball, connect metal part to treated with fixed part to form wheel surface of container, using circulating jet device to impact repeatedly the metal part surface from different incident angle, so that on same impact surface, there are many times impact from various incident angle; a recovery device for repeatedly use the ball. Said equipment can form nano scale microstructure or nano structured surface layer on surface of material treated.

Description

technical field [0001] The invention relates to metal surface treatment technology, in particular to a method and special equipment for forming nanostructures on metal parts. Background technique [0002] Typical ultrafine grains, usually smaller than 100 nm, exhibit characteristics of nanocrystalline materials in at least one dimension. These materials can be prepared by known methods, such as IGC (Inert Gas Condensation), SPD (Severe Plastic Deformation), etc., but these materials usually have the disadvantages of many pore-like defects and easy contamination. [0003] Using surface processing technology, the grains on the surface of metal parts can be refined, and may reach the nanometer scale. The traditional metal surface processing method uses compressed air to spray small-sized projectiles (such as metal) on the surface of the material at a speed of 5 to 100 m / s, and ultrasonic shot peening (the projectile speed is between 5 and 20 m / s) Between) the advantage of the...

Claims

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Application Information

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IPC IPC(8): C21D7/06
CPCC21D7/06C21D2201/03
Inventor 卢柯吕坚
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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