Method for preparing high-strength, high-conductivity and heat-resistant aluminum alloys

An aluminum alloy, high-conductivity technology, applied in the field of powder metallurgy, can solve the problems of limited electrical conductivity, rapid strength decline, and increased erection costs, and achieve the effects of little impact on electrical conductivity, preventing grain growth, and reducing power loss

Inactive Publication Date: 2015-01-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the added alloy elements will greatly affect the conductivity of aluminum, such as 6061 aluminum alloy, in which the content of Mg is 0.8-1.2%, the content of Si is 0.4-0.8%, its tensile strength can reach 160MPa, but its conductivity is only 57IACS %, a drop of 11% relative to 64IACS% for pure aluminum
And its heat resistance is poor, when the temperature rises during power transmission,

Method used

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  • Method for preparing high-strength, high-conductivity and heat-resistant aluminum alloys
  • Method for preparing high-strength, high-conductivity and heat-resistant aluminum alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Put pure aluminum powder and steel balls into a ball milling jar at a volume ratio of 3:1, and add stearic acid, a ball milling aid with 1% of the mass of aluminum powder, into the ball milling jar.

[0019] 2) Carry out ball milling on the loaded materials, the ball milling time is 5 hours, the rotating speed of the ball mill is 30rpm.

[0020] 3) Take out the aluminum powder after ball milling, put it into a bag for cold isostatic pressing, the pressure of cold isostatic pressing is 150MPa, and the holding time is 2min.

[0021] 4) The blank obtained after cold isostatic pressing is put into an atmosphere furnace for sintering, and the sintering temperature is 600°C.

[0022] 5) The aluminum rod obtained after sintering is hot-extruded, and the extrusion ratio is 4.

[0023] 6) Cold drawing the rod obtained after extrusion into a wire of required size.

Embodiment 2

[0025] 1) Put pure aluminum powder and steel balls into a ball milling jar at a volume ratio of 3:1, and add stearic acid, a ball milling aid with 1% of the mass of aluminum powder, into the ball milling jar.

[0026] 2) Carry out ball milling on the loaded materials, the ball milling time is 8 hours, and the ball mill speed is 40rpm.

[0027] 3) Take out the aluminum powder after ball milling, put it into a bag for cold isostatic pressing, the pressure of cold isostatic pressing is 180MPa, and the holding time is 2min.

[0028] 4) The blank obtained after cold isostatic pressing is put into an atmosphere furnace for sintering, and the sintering temperature is 620°C.

[0029] 5) The aluminum rod obtained after sintering is hot-extruded, and the extrusion ratio is 20.

[0030] 6) Cold drawing the rod obtained after extrusion into a wire of required size.

Embodiment 3

[0032] 1) Put pure aluminum powder and steel balls into a ball milling jar at a volume ratio of 3:1, and add stearic acid, a ball milling aid with 1% of the mass of aluminum powder, into the ball milling jar.

[0033] 2) Carry out ball milling on the loaded material, the ball milling time is 10h, and the ball mill speed is 50rpm.

[0034] 3) Take out the aluminum powder after ball milling, put it into a bag for cold isostatic pressing, the pressure of cold isostatic pressing is 200MPa, and the holding time is 2min.

[0035] 4) Put the blank obtained after cold isostatic pressing into an atmosphere furnace for sintering, and the sintering temperature is 600-640°C.

[0036] 5) The aluminum rod obtained after sintering is hot-extruded, and the extrusion ratio is 40.

[0037] 6) Cold drawing the rod obtained after extrusion into a wire of required size.

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Abstract

The invention discloses a method for preparing high-strength, high-conductivity and heat-resistant aluminum alloys. The method for preparing the high-strength, high-conductivity and heat-resistant aluminum alloys comprises the following steps: putting pure aluminum powder into a ball mill, ball milling, then putting the aluminum powder after ball milling into a cold isostatic pressure encapsulation sleeve and carrying cold isostatic pressure treatment, and putting pressure blanks after carrying out cold isostatic pressure treatment in a protective atmosphere to carry out sintering densification at a sintering temperature of 600-640 DEG C; and carrying out hot squeezing and cold drawing on sintered aluminum bars to obtain the high-strength, high-conductivity and heat-resistant aluminum alloys. The high-strength, high-conductivity and heat-resistant aluminum alloys prepared by the method are free of other alloy metals and just contain a nano-sized tiny oxide substance point which is used as a strengthening phase, and the strengthening phase is tiny and uniform, so that the strength of the material is improved, and the influence on the conductivity of the material is small; the oxide strengthening phase can stably exist at the high temperature, so that the recovery and re-crystallization of the material can be remarkably avoided, and the growth of crystal grains is avoided; therefore, the strength can be retained at the high temperature; the heat resistance of the material is remarkably improved.

Description

technical field [0001] The invention relates to the field of powder metallurgy, and relates to a method for preparing a high-strength, high-conductivity, heat-conduction, and high-heat-resistance aluminum alloy with excellent performance by adopting a powder metallurgy method. It is suitable for the production of various aluminum alloys that require high strength and high conductivity. Background technique [0002] Copper is a common material for wires and cables, with good conductivity and strength, but copper resources in my country are very scarce and expensive. Aluminum is also a good conductive metal material. The conductivity of pure aluminum is 64IACS%, and it is cheap and easy to process, so it has been widely concerned in the cable industry. However, the texture of pure aluminum is relatively soft, the tensile strength is only 60-70MPa, and the yield strength is 20MPa, which is difficult to meet the needs of use. The current general practice is to add a small amou...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C21/00
Inventor 罗骥曹慧钦郭志猛杨薇薇叶安平
Owner UNIV OF SCI & TECH BEIJING
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