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Method for preparing copper-coated aluminium composite material

A composite material and copper-clad aluminum technology, which is applied in the direction of metal/alloy conductors, cable/conductor manufacturing, electrical components, etc., can solve the problems of difficulty in producing large-size copper-clad aluminum products, limited process conditions, and low utilization of equipment. Achieve the effects of improving equipment utilization, good bonding, and less annealing times

Inactive Publication Date: 2011-06-22
厦门火炬特种金属材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydrostatic extrusion method requires a special equipment hydrostatic extrusion machine, the operation is complicated, the production efficiency is relatively low, limited by the process conditions, the utilization rate of the equipment is low, and it is difficult to produce large-sized copper-clad aluminum products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of copper clad aluminum flat strip with size 50x5mm.

[0022] (1) Copper tubes and aluminum rods are used as raw materials, and the copper tubes are tube blanks with uniform and refined grains processed by extrusion, rolling and other methods. The aluminum rod is cast or forged pure aluminum with a purity of more than 98%. The copper pipe with an outer diameter of 89mm and an inner diameter of 86mm is conical with a taper of 115°, followed by softening annealing at 400°C for 30 minutes, and pickling with 15% dilute sulfuric acid for 5 minutes to remove scale and ensure a smooth inner hole. Turn the aluminum rod according to the inner diameter of the copper tube and the size of the inner cone, and turn the cone on the head of the aluminum rod, wash it with 15% sodium hydroxide alkaline water for 3 to 10 minutes, dry it, and then fit it closely with the copper tube to form an extrusion billet. (Copper tube) The exterior is coated with graphite emulsion lubric...

Embodiment 2

[0027] The size is φ1mm. Preparation of copper-clad aluminum soft wire with a section ratio of 15%.

[0028] (1) Copper tubes and aluminum rods are used as raw materials, and the copper tubes are tube blanks with uniform and refined grains processed by extrusion, rolling and other methods. The aluminum rod is cast or forged pure aluminum with a purity of more than 98%. Cone the head of the copper pipe with an outer diameter of 49mm and an inner diameter of 45mm with a taper of 87°, then perform softening annealing at 400°C for 30 minutes, pickle with 15% dilute sulfuric acid for 5 minutes to remove scale, and ensure smooth inner holes. Turn the aluminum rod according to the inner diameter of the copper tube and the size of the inner cone, and turn the cone on the head of the aluminum rod, wash it with 15% sodium hydroxide alkaline water for 3 to 10 minutes, dry it, and then fit it closely with the copper tube to form an extrusion billet. (Copper tube) The exterior is coated ...

Embodiment 3

[0033] Preparation of copper-clad aluminum rods with a size of φ20 and a section ratio of 30%.

[0034](1) Copper tubes and aluminum rods are used as raw materials, and the copper tubes are tube blanks with uniform and refined grains processed by extrusion, rolling and other methods. The aluminum rod is cast or forged pure aluminum with a purity of more than 98%. Cone the head of the copper pipe with an outer diameter of 49mm and an inner diameter of 40mm, with a taper of 57°, then soften and anneal at 400°C for 30 minutes, pickle with 15% dilute sulfuric acid for 5 minutes to remove scale, and ensure smooth inner holes. According to the inner diameter of the copper tube and the size of the inner cone, the aluminum rod is turned, and the head of the aluminum rod is turned into a cone. After being washed with 15% sodium hydroxide alkaline water for 3 to 10 minutes and dried, it is closely matched with the copper tube to form an extrusion billet. (Copper tube) The exterior is c...

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Abstract

The invention relates to a method for preparing a copper-coated aluminium composite material. The method comprises the following steps: spinning the head of a copper tube which is utilized as a raw material to form a cone, turning the head of the aluminium bar which is utilized as a raw material to form a cone, mechanically polishing the aluminium bar and then sleeving the aluminium bar with the copper tube to form an extrusion billet; coating a colloidal graphite lubricating film on the exterior of the extrusion billet and carrying out copper and aluminium soldering and sealing on the tail of the extrusion billet; ensuring the container temperature of a hot hydrostatic extruder to be 350-450 DEG C, the temperature of an extruding die to be 150-350 DEG C, the temperature of the copper tube forming the extrusion billet to be 350-450 DEG C and the temperature of the aluminium bar to be 150-250 DEG C; and feeding the extrusion billet into the container, filling extrusion media and then carrying out hydrostatic extrusion, thus obtaining the copper-coated aluminium composite material, wherein the internal diameter of the copper tube is the same as the external diameter of the aluminium bar; and the extrusion ratio is 4-100. The method has the following beneficial effects: the copper-coated aluminium composite material prepared by the method has high copper / aluminium interface bond strength and good bending and forming performance; the frequency of annealing needed in the preparation process is low and the annealing temperature is low; and the production procedure is simplified and the production cost is lowered.

Description

technical field [0001] The invention relates to a preparation method of a copper-clad aluminum composite material, in particular to a preparation method of a copper-clad aluminum composite thin flat wire. The wire has excellent electrical conductivity and craftability. Background technique [0002] Copper has good electrical conductivity and is still the most important material in the fields of power transmission and signal transmission. With the rapid development of economic construction, my country has become the world's largest producer of copper products and the largest importer of copper resources. It needs to import a large amount of copper resources every year to ensure production needs. In recent years, the soaring price of copper has greatly affected the operating efficiency of domestic enterprises. my country is a country with a large amount of aluminum resources. Although the electrical conductivity of aluminum is slightly worse than that of copper, with the cont...

Claims

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Application Information

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IPC IPC(8): H01B13/00H01B1/02H01B5/02B23P15/00
Inventor 胡捷
Owner 厦门火炬特种金属材料有限公司
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