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Al2O3/Al-Si composite coating by spray coating on aluminium alloy surface and preparation method

A technology of aluminum alloy surface and composite coating, which is applied in the direction of metal material coating process and coating, can solve the problems of refractory oxide film melting, iron-aluminum intermetallic compounds are difficult to metallurgically bond, etc., and achieve the goal of improving wear resistance Effect

Inactive Publication Date: 2009-10-07
HUBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent utilizes the self-propagating reaction Fe 2 o 3 +2Al=2Fe+Al 2 o 3 Iron-aluminum intermetallic compound coating is obtained by reaction. This method requires the action of centrifugal force and is only suitable for obtaining wear-resistant coatings on the inner surface of components of tubular structures, and the reaction of Fe 2 o 3 +2Al=2Fe+Al 2 o 3 When the heat released is large in size, it is difficult to melt the oxide film on the surface of the aluminum alloy due to the thermal conductivity of the aluminum alloy, and it is difficult for the iron-aluminum intermetallic compound to form a metallurgical bond with the aluminum matrix.

Method used

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  • Al2O3/Al-Si composite coating by spray coating on aluminium alloy surface and preparation method
  • Al2O3/Al-Si composite coating by spray coating on aluminium alloy surface and preparation method

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Experimental program
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Effect test

Embodiment 1

[0024] Base material: aluminum alloy.

[0025] The mass percentage of spray powder composition is: Al-Si alloy powder of 70% eutectic composition, 30% SiO 2 powder. Powder particle size 10μm.

[0026] Oxygen-acetylene flame spraying process parameters: spraying distance is 100mm, spraying angle is 80°~90°, spray gun moving speed is 15cm / s, each spraying thickness is less than 0.10mm, coating thickness is 0.20mm.

[0027] Laser remelting coating process parameters: Heating temperature: 750°C.

Embodiment 2

[0029] Base material: aluminum alloy.

[0030] The mass percentage of spray powder composition is: Al-Si alloy powder of 80% eutectic composition, 20% SiO 2 powder. The powder particle size is 15μm.

[0031] Plasma spraying process parameters: spraying distance is 150mm, spraying angle is 80°~90°, spray gun moving speed is 15cm / s, each spraying thickness is less than 0.10mm, coating thickness is 0.3mm.

[0032] Plasma remelting coating process parameters: Heating temperature: 750°C.

Embodiment 3

[0034] Base material: aluminum alloy.

[0035] The mass percentage of spray powder composition is: Al-Si alloy powder of 90% eutectic composition, 10% SiO 2 powder. Powder particle size 20μm.

[0036] Supersonic flame spraying process parameters: spraying distance is 100mm, spraying angle is 80°~90°, spray gun moving speed is 15cm / s, each spraying thickness is less than 0.10mm, coating thickness is 0.20mm.

[0037] Laser remelting coating process parameters: Heating temperature: 750°C.

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Abstract

The invention provides Al2O3 / Al-Si composite coating by spray coating on aluminium alloy surface and a preparation method. Al2O3 / Al-Si composite coating is produced by heat spraying on aluminium alloy surface. Mass percent of heat spraying powders is: 60%-95% eutectic composition of Al-Si alloy powder, 5%-40%SiO2 powder. The sum of each component is 100%, and powder size is 5-20 mum. After composite coating is remelted by laser or plasma, the metal atoms melted in coating and on surface of base have enough energy to break through Al2O3 thin film layer on interface, and then metallurgical bonding pad is generated caused by vigorous mixing effect between atoms to form metallurgical bonding interface. The produced Al2O3 / Al-Si composite is more than 1200HV, bonding strength is more than 100 Mpa, and coating thickness ranges from 0.1mm to 1mm.

Description

technical field [0001] The invention relates to an aluminum alloy surface reactive spraying Al 2 o 3 The invention relates to an Al-Si composite coating and a preparation method thereof, belonging 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 wea...

Claims

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Application Information

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IPC IPC(8): C23C24/10
Inventor 周小平胡心彬
Owner HUBEI UNIV OF TECH
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