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Preparation method of aluminum-copper bimetal composite material

A composite material and bimetallic technology, applied in the direction of metal processing equipment, manufacturing tools, welding equipment, etc., can solve the problems of easy generation of cracks and low bonding strength, and achieve the effect of high interface strength

Active Publication Date: 2016-11-09
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing an aluminum-copper bimetallic composite material, which solves the problem that the aluminum-copper composite material prepared in the prior art has low bonding strength and cracks are easily generated during use

Method used

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  • Preparation method of aluminum-copper bimetal composite material

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preparation example Construction

[0013] The preparation method of the aluminum-copper bimetallic composite material of the present invention first pretreats the aluminum block and the copper block respectively, and then places the tungsten fiber net with nickel deposited on the surface between the aluminum and the copper, and places them together on a hot-pressing abrasive tool Diffusion molding of micro-area is carried out in hot pressing to obtain aluminum-copper bimetallic composite materials.

[0014] The specific steps are:

[0015] Step 1, soak pure copper or pure aluminum in 10% nitric acid alcohol for pickling, pickling for 1-5 minutes, and then wash with alcohol for later use

[0016] Step 2, wash the oil stains on the surface of the tungsten fiber mesh with alcohol, and then put it into a physical vapor deposition furnace for vacuuming. When the vacuum degree reaches 6.67×10 -2 After Pa, deposit nickel on the surface of the tungsten fiber mesh for 10-30 minutes;

[0017] Step 3, place the tungsten...

Embodiment 1

[0021] To prepare aluminum-copper bimetallic composite materials, process pure aluminum into a cylinder with a size of Φ30mm×20mm, and prepare pure copper with a size of Φ30mm×30mm;

[0022] Soak pure copper and pure aluminum in 10% nitric acid alcohol for pickling, pickle for 1min, then wash with alcohol and save for later use;

[0023] Rinse the 30-mesh tungsten fiber net with alcohol to wash the oil stains on the surface, and then put it into a physical vapor deposition furnace for vacuuming. When the vacuum degree reaches 6.67×10 -2 After Pa, deposit Ni material on the surface of 30-mesh tungsten fiber mesh for 15 minutes;

[0024] Put pure aluminum, 30-mesh tungsten fiber mesh, and pure copper in the hot-pressing mold in the HVRY-2 high-vacuum high-temperature hot-pressing sintering furnace. In order to prevent oxides from appearing on the interface, first heat the Vacuum the sintering furnace, when the vacuum degree in the vacuum hot pressing furnace reaches 6.67×10 -2...

Embodiment 2

[0026] To prepare aluminum-copper bimetallic composite materials, process pure aluminum into a cylinder with a size of Φ40mm×30mm, and at the same time, prepare pure copper with a size of Φ40mm×30mm;

[0027] Soak pure copper and pure aluminum in 10% nitric acid alcohol for pickling, pickling for 2 minutes, then wash with alcohol and save for later use;

[0028] Rinse the 60-mesh tungsten fiber net with alcohol to wash the oil stains on the surface, and then put it into a physical vapor deposition furnace for vacuuming. When the vacuum degree reaches 6.67×10 -2 After Pa, deposit Ni material on the surface of 60-mesh tungsten fiber mesh for 20 minutes;

[0029] Put pure aluminum, 60-mesh tungsten fiber mesh, and pure copper in the hot-pressing mold in the HVRY-2 high-vacuum high-temperature hot-pressing sintering furnace. In order to prevent oxides from appearing on the interface, first heat the Vacuum the sintering furnace, when the vacuum degree in the vacuum hot pressing fu...

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Abstract

The invention discloses a preparation method of an aluminum-copper bimetal composite material. The preparation method comprises the following steps of: first carrying out pre-treatment on an aluminium block and a copper block respectively, and then placing a tungsten fibre web deposited with nickel on the surface between aluminum and copper; and placing aluminum, the tungsten fibre web and copper in a hot-pressing grinding tool and carrying out hot-pressing micro-area diffusion forming to obtain the aluminum-copper bimetal composite material. According to the preparation method of the aluminum-copper bimetal composite material, which is disclosed by the invention, Ni of a proper thickness is physically deposited on a tungsten fibre surface, thereby facilitating diffusion of Ni towards the two sides of aluminum and copper; the pure aluminum melted on the surface under a high-temperature condition is guaranteed to form a micron-scale interface bonding structure with a solid-state copper alloy through tungsten fibre micro-area diffusion by virtue of the difference between aluminum and copper in melting point, and thus metallurgical bonding between aluminum and copper is realized. In addition to the respective excellent performance of aluminum and copper, the formed bimetal composite material has high interface strength, and the interface shear strength of the bimetal composite material can reach more than 100MPa.

Description

technical field [0001] The invention belongs to the technical field of bimetallic composite material preparation, and in particular relates to a method for preparing an aluminum-copper bimetallic composite material. Background technique [0002] The connection of Al-Cu dissimilar metals is widely used in metallurgy, electric power, chemical industry, refrigeration and aerospace industries. At present, welding methods such as melting and casting, explosion welding, and friction stir welding are mainly used to realize the connection of Al-Cu bimetals. However, since the melting points of Al and Cu differ by 424°C, the linear expansion coefficients differ by more than 40%, and the electrical conductivity also differs by more than 70%. Moreover, Al and Cu are active metal elements that are easily oxidized. During the welding process, the two metals not only easily form metal oxides, but also easily form the intermetallic compound CuAl at the interface. 2 , This brittle-hard pha...

Claims

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Application Information

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IPC IPC(8): B23K20/02B23K20/16B23K20/233B23K20/24B23K103/18
CPCB23K20/026B23K20/16B23K20/2333B23K20/24B23K2103/18
Inventor 邹军涛梁淑华魏艳妮罗永光曲洪涛
Owner XIAN UNIV OF TECH
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