Preparation method of composite high-speed steel wear-resistant layer on aluminum alloy surface

A technology of aluminum alloy surface and high-speed steel, applied in metal processing equipment, metal material coating technology, coating, etc., can solve the problems of easy peeling, low bonding strength of wear-resistant coating, and difficulty in meeting the requirements of workpiece use, and achieve The effect of good wear resistance

Inactive Publication Date: 2011-12-21
HUBEI UNIV OF TECH
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Problems solved by technology

Therefore, the wear-resistant coating prepared on the aluminum alloy surface by thermal spraying method h

Method used

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  • Preparation method of composite high-speed steel wear-resistant layer on aluminum alloy surface
  • Preparation method of composite high-speed steel wear-resistant layer on aluminum alloy surface

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preparation example Construction

[0019] An embodiment of the present invention provides a method for preparing a high-speed steel wear-resistant layer on an aluminum alloy surface, comprising the following steps:

[0020] (a) Aluminum alloy surface degreasing and sandblasting;

[0021] (b) Thermal spraying high-speed steel coating on the aluminum alloy surface;

[0022] (c) Coating friction stir processing.

[0023] Soak in 3-4% NaCl aqueous solution for 10-20 minutes for degreasing, and then wash with water. Sandblasting uses brown alumina sand grains with a particle size of 500-550μm, the nozzle outlet pressure of the sandblasting machine is 0.6-0.7MPa, and the distance between the nozzle and the product is 25-30mm.

[0024] Thermal spraying is performed on aluminum alloy products that have been degreased and sandblasted on the surface. The raw material for thermal spraying is W18Cr4V or W6Mo5Cr4V2 high-speed steel powder.

[0025] Friction stir processing is performed on aluminum alloy products coated w...

Embodiment 1

[0028] Example 1 Preparation of wear-resistant layer of composite high-speed steel

[0029] Base material: aluminum alloy.

[0030] Coating powder material: High speed steel powder. Powder particle size 20μm-50μm.

[0031] Coating preparation method: Oxygen-acetylene flame spraying. Coating thickness: 0.2mm.

[0032] Friction stir processing process parameters: the diameter of the stirring head is ф10㎜, the rotation speed is 1000rpm, and the moving speed is 20㎜ / min.

Embodiment 2

[0033] Example 2 Preparation of wear-resistant layer of composite high-speed steel

[0034] Base material: aluminum alloy.

[0035] Coating powder material: High speed steel powder. Powder particle size 20μm-50μm.

[0036] Coating preparation method: plasma spraying. Coating thickness: 0.5 mm.

[0037] Friction stir processing process parameters: the diameter of the stirring head is ф15㎜, the rotation speed is 1500rpm, and the moving speed is 30㎜ / min.

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Abstract

The invention relates to a method for preparing a composite high-speed steel wear-resistant layer on the surface of an aluminum alloy. First, a high-speed steel coating with a thickness of 0.2 mm to 1.5 mm is thermally sprayed on the surface of an aluminum alloy, and then the thermally sprayed high-speed steel is processed by friction stir processing. The coating is evenly inlaid and fused in the aluminum alloy surface layer to form a good wear-resistant layer, and a metallurgical bond is formed between the coating and the substrate. In the invention, the thermal spraying coating is evenly inlaid and fused in the surface layer of the aluminum alloy through friction stirring processing to form a good wear-resistant layer, and a metallurgical bond is formed between the coating and the substrate. The hardness of the wear-resistant layer of the high-speed steel obtained by the invention is greater than 520HV, and the bonding strength is greater than 70MPa.

Description

technical field [0001] The invention relates to a preparation method of a composite high-speed steel wear-resistant layer on an aluminum alloy surface, and belongs to the technical field of material engineering. Background technique [0002] Aluminum alloy is the most used non-ferrous metal material in the world, and it is widely used in aviation, spaceflight and power machinery. However, the hardness of aluminum alloy is very low, the wear resistance is very poor, and the application range is greatly limited. For example, after the engine is changed from the original cast iron material to aluminum alloy, due to the poor wear resistance of the aluminum alloy, the part of the inner wall of the engine cylinder in contact with the piston will be severely worn, which will greatly reduce the service life of the engine. In addition, parts that require wear resistance such as synchronizer rings and piston rings cannot meet the requirements of wear resistance if they are made of al...

Claims

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Application Information

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IPC IPC(8): B23K20/12C23C4/06
Inventor 周小平胡心彬
Owner HUBEI UNIV OF TECH
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