Method and device for preparing composite ceramic layer surface strengthened aluminum alloy material

A technology of aluminum alloy materials and composite ceramics, which is applied in the field of aluminum alloy materials and its preparation, can solve the problems of metallurgical bonding, low bonding strength, and easy cracking, etc., and achieve fine grain size, uniform temperature, and uniform phase structure Effect

Inactive Publication Date: 2014-04-16
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method and device for preparing an aluminum alloy material with a surface-strengthened composite ceramic layer to solve the problems of low bonding strength, easy cracking, falling off, and failure due to temperature stress in the diffusion coating method and the cladding layer method. Microcracks and porosity defects appear, resulting in the failure of good metallurgical bonding

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  • Method and device for preparing composite ceramic layer surface strengthened aluminum alloy material

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Embodiment 1

[0021] Aluminum alloy material with surface strengthening of composite ceramic layer and preparation method thereof:

[0022] a. Use high-energy ball milling equipment to prepare mixed powder, mixed powder includes: Mg, Al, MgO, SiO 2 、 Al 2 o 3 and SiC six micropowders, according to the molar ratio of 7:6:3:3:7:3, the particle size distribution is between 0.6 and 1.6 microns;

[0023] b. The base aluminum alloy undergoes surface sandpaper grinding, acetone ultrasonic cleaning, lye cleaning, neutralization, clear water, and drying processes in order to remove the crystal water oxide film on the surface and clean the base aluminum alloy surface;

[0024] c. Coating the mixed powder on the surface of the cleaned base aluminum alloy by electrophoresis, and coating the mixed powder layer on the surface of the base aluminum alloy;

[0025] d. Put the surface-coated mixed powder layer and the base aluminum alloy into the microwave sintering device. The main frequency of the micro...

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Abstract

Disclosed are a method and a device for preparing a composite ceramic layer surface strengthened aluminum alloy material. A composite ceramic layer is of a polyphase structure comprising SiC, SiO2, Al2O3, MgAl2O4 and the like, and grain size distribution of the polyphase structure ranges from submicron to nanometer. The basic production process method includes: coating mixed powder with a proper grain size and proper components on a cleaned matrix aluminum alloy surface; placing the matrix aluminum alloy surface coated with the mixed powder into a microwave sintering device and heating the matrix aluminum alloy surface to reach a proper temperature; leading a surface layer coated with the mixed powder to have corresponding physical and chemical reaction to generate the polyphase structure; and leading the surface layer and matrix aluminum alloys to be in metallurgical bonding to form the composite ceramic layer surface strengthened aluminum alloy material. The microwave sintering device used in the method comprises a microwave generator, a far infrared thermometer, a heat insulation plate, a microwave absorbing layer, a workpiece platform, a compression spring and the like, and an aluminum alloy matrix and the surface layer coated with the mixed powder can be simultaneously heated in the same microwave field.

Description

technical field [0001] The invention relates to an aluminum alloy material and a preparation method thereof, in particular to a preparation method and a device for an aluminum alloy material whose surface is strengthened by a composite ceramic layer. Background technique [0002] Aluminum and aluminum alloys are the most widely used metal materials except ferrous metals. Aluminum alloy has excellent properties such as low density, low thermal expansion coefficient, high specific stiffness and specific strength, and has been widely used in machinery, construction, transportation, national defense, aerospace, automotive and other fields, and has become a typical structural material. However, aluminum alloys also have many problems, such as: in the presence of chloride ions and alkaline media, it is prone to pitting corrosion, crevice corrosion, stress corrosion and corrosion fatigue and other forms of damage; low hardness, friction coefficient High, high wear, easy to strain ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F7/04
Inventor 王延庆王中明庄全超沈承金
Owner CHINA UNIV OF MINING & TECH
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