Light metal surface laser impact micronano particle injection reinforcing method

A technology of micro-nano particles and laser shock, which is applied in the field of surface modification of light metal materials, can solve the problems of limiting the application range of light metal materials, poor surface hardness and wear resistance, and burning of light alloy elements, so as to improve surface hardness and improve performance , the effect of improving the overall performance

Inactive Publication Date: 2010-06-16
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main disadvantage of light metal materials is their poor surface hardness and wear resistance, which limits the application range of light metal materials to a certain extent.
Existing surface strengthening methods for light metal materials include shot peening, thermal spraying, plasma spraying, micro-arc oxidation, laser alloying and laser cladding, etc. Defects such as element burning, pores, cracks, and changes in the original surface state

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  • Light metal surface laser impact micronano particle injection reinforcing method
  • Light metal surface laser impact micronano particle injection reinforcing method
  • Light metal surface laser impact micronano particle injection reinforcing method

Examples

Experimental program
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Embodiment 1

[0027] Example 1: Laser Shock Nanoparticle Implantation Strengthening Method on Aluminum Alloy Surface

[0028] Aluminum alloys are widely used, but common melting strengthening methods may cause defects such as light element burning and cracks. The method of the present invention is implemented on the surface of aluminum alloys for laser shock nanoparticle injection strengthening, which includes the following steps:

[0029] (1) First remove the oxide layer on the surface of the aluminum alloy by mechanical grinding, then polish it with 800# metallographic sandpaper, and finally clean the surface of the aluminum alloy with acetone;

[0030] (2) Pre-coat WC particles with a particle size of 100 nanometers on the surface of the aluminum alloy with an inorganic binder. The thickness of the nano-WC particle coating is 0.1 mm. The thickness of the layer is 0.2mm, dry naturally;

[0031] (3) Use high-energy short-pulse Nd:YAG laser to shock the above-mentioned absorbing layer and ...

Embodiment 2

[0035] Example 2: Laser Shock Micron Particle Implantation Strengthening Method on Magnesium Alloy Surface

[0036] Magnesium alloys have a very wide range of applications, but common melting strengthening methods may cause defects such as light element burning, pores and cracks. The method of the present invention is implemented on the surface of magnesium alloys for laser shock micron particle injection strengthening, which includes the following steps:

[0037] (1) First remove the oxide layer on the surface of the magnesium alloy by chemical etching, then polish it with 900# metallographic sandpaper, and finally clean the surface of the magnesium alloy with alcohol;

[0038] (2) Pre-coat SiC particles with a particle size of 100 microns on the surface of the magnesium alloy with an inorganic binder. The coating thickness of the micron SiC particles is 0.5 mm. The thickness of the layer is 0.5mm, dry naturally;

[0039] (3) Use high-energy short-pulse Nd:YAG laser to shock t...

Embodiment 3

[0042] Example 3: Laser Shock Nanoparticle Implantation Strengthening Method on Titanium Alloy Surface

[0043] Titanium alloy has a very wide range of applications, but the common melting strengthening method may cause defects such as light element burning, pores and cracks. The method of the present invention is implemented on the surface of titanium alloy by laser shock nanoparticle implantation strengthening, which includes the following steps:

[0044] (1) First remove the oxide layer on the surface of the titanium alloy by mechanical grinding, then polish it with 1000# metallographic sandpaper, and finally clean the surface of the titanium alloy with acetone;

[0045] (2) Use an inorganic binder to pre-coat TiC particles with a particle size of 1 nanometer on the surface of the titanium alloy. The thickness of the nano-TiC particle coating is 1 mm. After drying, apply a layer of black paint as an absorbing layer for laser shock. The thickness is 1mm, dry naturally;

[0...

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Abstract

The invention relates to a light metal surface laser impact micronano particles injection reinforcing method, comprising the following steps: 1) removing the oxide layer probably existing on the surface of the light metal by a mechanical polishing or chemical corrosion method, then grinding and polishing with sand paper, and finally cleaning the surface of the light metal alloy with acetone or alcohol; 2) precoating the micronano particles on the surface of the light metal with inorganic bonding agent, recoating a layer of black paint on the surface of the micronano particle coating layer to serve as the absorption layer of laser impact after drying, and drying naturally; 3) impacting the absorption layer and the micronano particle layer with high-energy short pulse laser, and utilizing K9 glass or running water as a restriction layer during laser impact; and 4) soaking the micronano particle coating layer processed by acetone, and then removing the absorption layer through washing with running water or ultrasonic washing to obtain the micronano particle injection reinforcing layer. The invention integrates the actions of laser impact reinforcement, nano particle reinforcement and nano particle reinforcement, can dramatically improve hardness, abrasion resistance and fatigue resistance property of light metal surface layer, and has wide application prospect.

Description

technical field [0001] The invention relates to a method for modifying the surface of light metal materials, in particular to a laser-shock micro-nano particle injection strengthening method for light metal surfaces which integrates the laser shock effect and the excellent performance of micro-nano particles. Background technique [0002] At present, light metal materials such as aluminum alloys, titanium alloys, and magnesium alloys are widely used as a class of metal materials. They have many excellent properties such as low density, high specific strength, easy processing, strong corrosion resistance, and recyclability. It is widely used in aerospace, automobile, electrical equipment, communication equipment and sports equipment and other fields. The main disadvantage of light metal materials is their poor surface hardness and wear resistance, which limits the application range of light metal materials to a certain extent. Existing surface strengthening methods for light...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F3/00
Inventor 钟敏霖朱仁杰吕亮张红军刘文今马明星
Owner TSINGHUA UNIV
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