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A method for preparing compound coating by laser shock induced chemical reaction

A technology of laser shock and chemical reaction, applied in the direction of heating inorganic powder coating, etc., to increase the contact area between powders, shorten the diffusion distance, and improve the coating performance

Active Publication Date: 2017-02-01
HUAWEI TEHCHNOLOGIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems existing in the existing methods, and to provide a method for preparing compound coatings by laser shock-induced chemical reactions, which uses a composite method combining mechanical activation and laser shock to excite mixed powders to undergo chemical reactions and promote surface compound coatings. The formation of the coating, and refining and densifying the coating structure, improving the interface bonding, and obtaining a compound coating with a fine, dense structure and high bonding strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Grind and polish the surface of 304 stainless steel, and then perform ultrasonic cleaning in alcohol;

[0026] 2) Select 50nm metal nickel powder and 20nm metal titanium powder, and carry out proportioning according to the atomic ratio of 1:1;

[0027] 3) Uniformly mix and mechanically activate the proportioned mixed powder through a high-energy ball mill under the protection of argon;

[0028] 4) The mechanically activated mixed powder is pre-placed on the pretreated stainless steel surface and pre-compacted, and the compacted density is 90% of the maximum theoretical density;

[0029] 5) Cover the stainless steel with pre-compacted powder with 20 μm aluminum foil for the absorption layer;

[0030] 6) With glass as the constrained layer, the pre-compacted powder on the surface of stainless steel is treated with laser shock, and the laser power density is 3GW / cm 2 , the laser pulse width is 5ns, the spot diameter is 10mm, and the overlap rate is 80%, and the chemic...

Embodiment 2

[0033] 1) Grinding and polishing the metal titanium surface, and then ultrasonic cleaning in alcohol;

[0034] 2) Select 100 μm metallic titanium powder and 30 μm non-metallic silicon powder, and make a ratio according to the atomic ratio of 5:3;

[0035] 3) Uniformly mix and mechanically activate the proportioned mixed powder through a high-energy ball mill under the protection of argon;

[0036] 4) The mechanically activated mixed powder is pre-placed on the surface of the pretreated titanium metal, and pre-compacted, and the compacted density is 40% of the maximum theoretical density;

[0037] 5) Cover the pre-compacted powder metal titanium with a 40 μm absorbent layer aluminum foil;

[0038] 6) With flowing water as the constrained layer, the pre-compacted powder on the surface of metal titanium is treated with laser shock, and the laser power density is 6GW / cm 2 , the laser pulse width is 40ns, the spot diameter is 0.5mm, and the overlap rate is 50%, and the chemical r...

Embodiment 3

[0041] 1) Grind and polish the surface of 6061 aluminum alloy, and then perform ultrasonic cleaning in alcohol;

[0042] 2) Select 50nm metal nickel powder and 20μm metal aluminum powder, and carry out the ratio according to the atomic ratio of 3:1;

[0043] 3) Uniformly mix and mechanically activate the proportioned mixed powder through a high-energy ball mill under the protection of argon;

[0044] 4) The mechanically activated mixed powder is pre-placed on the surface of the pretreated aluminum alloy, and pre-compacted, and the compacted density is 60% of the maximum theoretical density;

[0045] 5) Cover the aluminum alloy of the pre-compacted powder with 30 μm aluminum foil of the absorbing layer;

[0046] 6) With glass as the constrained layer, the pre-compacted powder on the surface of the aluminum alloy is treated with laser shock, and the laser power density is 10GW / cm 2 , the laser pulse width is 25ns, the spot diameter is 7mm, and the overlap rate is 20%, and the ch...

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Abstract

The invention discloses a method for preparing compound coatings through a laser shock induced chemical reaction, which relates to the field of material surface techniques. The method comprises the following main steps: 1) carrying out pretreatment on a metal material surface; 2) selecting and proportioning metal or nonmetal powder according to the compositions of the compound coating; 3) carrying out uniform mixing and mechanical activation on the proportioned mixed powder through ball-milling; 4) presetting the mixed powder subjected to mechanical activation into the pretreated metal material surface, and carrying on pre-compacted on the mixed powder; 5) wrapping a metal material with the preset compacted powder by using an absorption layered aluminum foil; and 6) by taking glass or flowing water as a constraint layer, treating the pre-compacted powder on the material surface by using laser shock, and inducing the pre-compacted powder to have a chemical reaction, so that a surface compound coating is prepared. According to the invention, a compound coating is prepared through a mechanical force induced chemical reaction, and therefore, the method is energy-saving and environmental-friendly; a prepared compound coating is small and dense in tissues and high in bonding strength, and significantly improves the surface performances of materials. The method disclosed by the invention is simple in technological process, easy to operate and suitable for mass production on a large scale.

Description

technical field [0001] The invention relates to the technical field of material surfaces, in particular to a method for preparing a compound coating by laser shock-induced chemical reaction. Background technique [0002] As one of the important engineering materials, metal materials have been processed into various metal parts and widely used in various industrial fields. Metal parts usually fail due to wear, corrosion, high-temperature oxidation, etc. during engineering applications, which severely limits their applications. The failure of metal parts is closely related to its surface properties. Therefore, improving the surface properties has become an important means to avoid its failure and prolong its service life. [0003] Surface modification technology can improve the surface properties of materials by changing the composition and structure of the material surface itself or preparing a coating on the surface of the material, which is an important method to prolong t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/08
Inventor 崔承云崔熙贵周建忠许晓静张朝阳
Owner HUAWEI TEHCHNOLOGIES CO LTD
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