CN105642698A

CN105642698A - Preparation method of silver-clad aluminum composite microwire

Info

Publication number: CN105642698A
Application number: CN201610009106.7A
Authority: CN
Inventors: 罗奕兵; 彭伟杰; 戴晓元
Original assignee: Changsha University of Science and Technology
Current assignee: Changsha University of Science and Technology
Priority date: 2016-01-08
Filing date: 2016-01-08
Publication date: 2016-06-08
Anticipated expiration: 2036-01-08
Also published as: CN105642698B

Abstract

The invention provides a preparation method of a silver-clad aluminum composite microwire. The preparation method of the silver-clad aluminum composite microwire comprises the steps that (1) an aluminum core and a silver tube with the outer diameter being in transition fit with the outer diameter of the aluminum core are selected and are subjected to deoiling and oxidation film treatment, then the aluminum core and the silver tube are dried and assembled in a vacuum operation box, and the two ends are sealed in a local plastic deformation way after assembly; (2) after inductive heating is conducted on an assembled composite bar, a silver-clad aluminum composite wire is prepared through hole type rolling or stretching or extruding; (3) the silver-clad aluminum composite wire is stretched into a composite microwire with the diameter phi being 0.02-0.5 mm through single-mold stretching or multi-mold water tank stretching; and (4) when cold deformation is about 90%-99% of the percentage of area reduction, annealing treatment is conducted on the composite wire at the temperature of 200-400 DEG C for 0.1-1 hour.

Description

A kind of silver bag aluminium compound microfilament preparation method

Technical field

The present invention relates to the preparation method of a kind of bimetal compound microfilament, especially a kind of transverse section is the preparation method of circular silver-colored bag aluminium compound microfilament.

Background technology

The silver-colored metal the highest as electric conductivity, has a wide range of applications in microelectronics. But, due to the shortage of silver resource, directly with silver silk material as electro-conductive material cost height, it is unfavorable for that it is applied. Composite wire has the high-performance that single-material cannot reach, and applies more and more wider in industry-by-industry. Silver coated aluminum compound silk material with its electric conductivity height, contact performance is good, density is little etc., and feature is widely used in aviation wire and waveguide aspect. The preparation of existing silver coated aluminum compound silk mainly contains two kinds of methods, 1) aluminum steel silver impregnation method, this method exists that thickness of coating is limited, in uneven thickness, the shortcomings such as bonding strength is lower between coating and core; 2) hydrostatic extrusion+annealing+many to time drawing method [thank build new etc., one high-performance silver coated aluminum compound silk material and preparation technology [P] thereof, Chinese invention patent, the patent No.: CN200710063265], it is big that the method has facility investment, and technical process is long, and production efficiency is not high; And due to the yield strength ratio of silver/aluminium relatively big, cause the silver coating flow of metal difficulty when hydrostatic extrusion, silver layer metal flow is relatively slow compared with core layer aluminium, thus ring shape fracture defect easily occurs in coated with silver layer.

Summary of the invention

The present invention is directed to the deficiency of existing silver bag aluminium microfilament production technology, it is provided that a kind of flow process is relatively short, the preparation method of high efficiency silver bag aluminium microfilament.

The present invention solves the scheme that its technical problem is taked:

1) aluminium core and the silver pipe with aluminium core external diameter transition fit is selected, through deoiling and oxide film, dry and assembling in vacuum operating case, after assembling, two ends adopt the mode of local plastic deformation to seal;

2) compound bar assembled, after induction heating, is prepared into silver cladding through groove rolling or stretching or extruding and closes aluminum steel material;

3) silver bag aluminum steel material is stretched to through single mode stretching or multimode water tank��0.02-0.5mm microfilament;

4) when cold deformation amount is that relative reduction in area is about 90-99%, composite wire material carries out anneal, and annealing temperature is 200-400 DEG C, annealing time 0.1-1h.

Compared with prior art, the present invention has following technological merit:

1) compared with electrochemical plating, owing to composite wire is through strong cold gross distortion, coating layer compactness is higher;

2) silver pipe, aluminium core through deoiling, after oxide film processes, assemble in vacuum operating case, eliminate oxidation, simultaneously by the viscous deformation of aluminium core, enclose the gap of silver pipe with aluminium core, make compound interface maintain high clean and non-oxidation, it is to increase interface bond strength;

3) compared with hydrostatic extrusion method, the method production cost is lower;During hydrostatic extrusion, silver pipe and aluminium bar head must be processed into the operation of taper, operate comparatively simple, though hydrostatic extrusion distortion amount is bigger, but it is normal temperature extruding, make silver, the more difficult diffusion of aluminium atom and form real metallurgical binding, subsequent anneal cooperation is also needed to process to improve bonding strength, and the present invention adopts induction heating, according to blank size and coating thickness, adjustment induced current frequency and heat-up time, make to produce bigger temperature head between silver coating and aluminium core layer, reduce the ratio of the yield strength of silver/aluminium, from when complex line base is prepared in plastic working, coating layer and core layer flow of metal are reached unanimity, reduce production cost and avoid the appearance of silver layer Bamboo knobs crack, simultaneously, rod base is under the dual function of induction heating and temperature increasing by deformation effect, silver/aluminium compound interface energy long period is made to maintain certain temperature, facilitate the diffusion between silver, aluminium atom, form real metallurgical binding, improve the bonding strength of transition layer, be conducive to obtaining high performance silver bag aluminium compound microfilament.

Embodiment:

Below in conjunction with embodiment, the invention will be further described:

Embodiment 1:��0.07mm silver bag aluminium compound microfilament forming technology

1) select��25mm aluminium core and the silver being transition fit with aluminium core external diameter are managed, and silver pipe external diameter is��30mm, silver length of tube is 200mm, and aluminium core length is 202mm; Silver pipe inwall and aluminium core, through deoiling and after oxide film, dry and assembling, gives certain compression set to the aluminium core stretched out after assembling in vacuum operating case, with the gap sealed between silver pipe and aluminium bar, avoid the oxidation of compound interface;

2) compound bar billet assembled is after Frequency Induction Heating, and the ellipse-circular hole system entering multi-pass immediately is rolled into��6mm silver bag aluminium complex line base, every time relative reduction in area is 10 ~ 30%;

3)��6mm silver bag aluminium complex line base, adopts multi-pass single mode to be drawn into��1.0mm, lubricant is vegetables oil, and every time relative reduction in area is 15 ~ 25%;

4)��1.0mm silver coated aluminum compound silk material carries out anneal under argon gas shielded, and annealing temperature is 300 DEG C, and annealing time is 0.5h;

5)��1.0mm silver coated aluminum compound silk material adopts water tank multimode to be stretched to��0.08mm microfilament, lubricant is aviation kerosene, and every time deformation rate is controlled to relative reduction in area 8 ~ 20%.

Embodiment 2:��0.5mm silver bag aluminium compound microfilament forming technology

1) select��25mm aluminium core and the silver pipe with aluminium core external diameter transition fit, silver pipe external diameter is��30mm, silver length of tube is 200mm, and aluminium core length is 202mm; Through deoiling and after oxide film, dry and assembling, gives certain compression set to the aluminium core stretched out after assembling in vacuum operating case, with the gap sealed between silver pipe and aluminium bar, avoid the oxidation of compound interface;

2) compound bar assembled is after Frequency Induction Heating, and the stretching of row multi-pass immediately is made��2mm silver bag aluminium complex line base, lubricant is vegetables oil, and every time relative reduction in area is 12 ~ 30%;

3)��2mm silver coated aluminum compound silk material carries out anneal under argon gas shielded, and annealing temperature is 300 DEG C, and annealing time is 0.5h;

4) multi-pass single mode is adopted to be stretched to��0.5mm microfilament, lubricant is aviation kerosene, and every time deformation rate of silver coated aluminum compound silk material is controlled to relative reduction in area 8 ~ 20%.

Claims

1. the preparation method of a silver-colored bag aluminium microfilament, it is characterised in that, preparation process is:

Selecting aluminium core and the silver-colored Guan Jing with aluminium core external diameter transition fit to deoil and oxide film, dry and assembling in vacuum operating case, after assembling, two ends adopt the mode of local plastic deformation to seal;

The compound bar assembled, after induction heating, is prepared into silver bag copper/aluminum composite wire through groove rolling or stretching or extruding;

Silver bag copper/aluminum composite wire stretches through single mode or multimode water tank is stretched to��0.02-0.5mm compound microfilament;

When cold deformation is that relative reduction in area is about 90-99%, composite wire material carries out anneal, and annealing temperature is 200-400 DEG C, annealing time 0.1-1h.