CN100555473C - A kind of high-performance silver coated aluminum compound silk material and preparation technology thereof - Google Patents
A kind of high-performance silver coated aluminum compound silk material and preparation technology thereof Download PDFInfo
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- CN100555473C CN100555473C CNB2007100632656A CN200710063265A CN100555473C CN 100555473 C CN100555473 C CN 100555473C CN B2007100632656 A CNB2007100632656 A CN B2007100632656A CN 200710063265 A CN200710063265 A CN 200710063265A CN 100555473 C CN100555473 C CN 100555473C
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Abstract
A kind of high-performance silver coated aluminum compound silk material and preparation technology thereof belong to high performance metallic composite material and preparation technology field thereof.Silver coated aluminum compound silk material is the core silk with the fine aluminium, and fine silver is a coating layer, and it is of a size of: external diameter is Φ 20 μ m～Φ 1000 μ m, and the core filament diameter is Φ 10 μ m～Φ 950 μ m.The preparation technology of silver coated aluminum compound silk material is divided into quiet liquid extruding of employing and two steps of multi-pass drawing.The invention has the advantages that the hot strength test finds that the silk material has higher intensity, examines under a microscope and finds that silver-colored alclad silk material surface quality is good, silk material diameter is very little in the length direction fluctuation, and silver layer is evenly distributed.In conjunction with high conductivity of fine silver and the characteristics that fine aluminium is cheap, density is little, silver coated aluminum compound silk material has good application prospects in fields such as electronic information, space flight and aviation.
Description
Technical field
The invention belongs to high performance metallic composite material and preparation technology field thereof, a kind of high-performance silver coated aluminum compound silk material and preparation technology thereof particularly are provided.Has good application prospects at electronic information, aerospace field.
Technical background
Silver has good electric conductivity.By the standard of international annealed copper conductivity, the standard conductivity of getting high-purity annealed copper is 100%, then the conductivity of high fine silver be 108.4% (see: Ningyuan's great waves, Zhao Huaizhi. silver. Changsha: publishing house of Central South University, 2005).Thereby silver-colored lead has important purposes in microelectric technique, especially in the field of ask for something high conductivity.But because the shortage of silver-colored resource costs an arm and a leg, it is restricted in the application in these fields.And bauxite resource is abundant, low price, density are low, is one of at present most widely used electric conducting material.But the resistivity of aluminium is greater than the resistivity of silver, and the resistivity of fine aluminium is 1.6 times of fine silver under the room temperature.Silver alclad compound wire is a kind of desirable substitute, and it not only can bring into play the good electric conductivity of fine silver, and can save silver-colored resource in a large number.But there is big difficulty in the preparation of silver-colored alclad wire rod, the especially diameter high-performance composite wire material below Φ 100 μ m.
The main preparation methods of metal composite wire material can be divided into:
(1) adopt silk material overlay coating method directly to prepare the metal composite wire material.But this method exists, and thickness of coating is limited, thickness of coating is inhomogeneous, shortcomings such as bond strength is low between coating and the core, thereby is not suitable for preparation high-performance clad metal wire material;
(2) prepare composite bar or wire rod earlier, adopt drawing or rolling further to be processed into composite wire material again.Compound and the casting composite algorithm of plastic working is mainly adopted in the preparation of metal composite bar or wire rod.Early stage method mainly contains: utilize aluminium powder rolling and aluminium strip pressing legal system to be equipped with aluminium-clad steel wire, but product quality and cost all can not satisfy application requirements (see: Sun Deqin etc., the material Leader, Vol.17, No.5 (2003), P65); Prepare composite wire such as copper covered steel wire with hot dipping and galvanoplastic, but its development because of environmental problem be restricted (see: Sun Shenlin, broadcasting and TV tech, No.5 (1997), P105); And for example adopt the aluminum steel copper-plating method to prepare copper-clad aluminum conductor, though technology is simple, but except that existing equally the environmental problem because have that coating performance is poor, coating and problems such as the core interface bond strength is low, coating and core concentricity difference, be difficult to satisfy the high-performance instructions for use.In addition, people also utilize rolling crimping method and clad welded legal system to be equipped with the copper cover aluminum wire rod, but its shortcoming is difficulty of the stability of complex process, product quality and consistency control.At present, use more widely composite wire prepare processing method mainly contain continuously extruded coating, cast draw, hot-dip, reverse solidification (see: Sun Deqin etc., the material Leader, Vol.17, No.5 (2003), P65).But because the characteristic that silver-colored alclad composite material self is had, promptly the intensity of its outer layer metal, hardness and fusing point are not suitable for adopting these method preparations all than the height of core.Adopt the composite blank hot extrusion to prepare bar or wire rod, can produce that coating thickness is inhomogeneous along its length (sees: Xie Jianxin, Liu Jingan. metal extruding theory and technology. Beijing: metallurgical industry publishing house, 2001, P314), and under hot conditions, easily form frangible compounds in compound interface silver coating one side.
Because there are various shortcomings in the above method for preparing the metal composite wire rod, the present invention proposes to adopt calm liquid extrusion to prepare silver-colored alclad composite wire, prepares the new technology of silver coated aluminum compound silk material by follow-up multi-pass drawing.The common extruding of quiet liquid extrusion ratio has strong three-dimensional compressive stress state, realizes advantages such as large extrusion ratio distortion, metal flow be more even easily, thereby being very suitable for two kinds of metals, to carry out state under the low temperature large deformation mutually compound.According to demand, in the drawing course of processing, implement suitable softening annealing and handle.
Summary of the invention
The object of the present invention is to provide a kind of high-performance silver coated aluminum compound silk material and preparation technology thereof, solved that coating thickness is inhomogeneous, problems such as fracture of wire, product quality and performances instability easily in the drawing process.
Silver coated aluminum compound silk material of the present invention is to be the core silk with the fine aluminium, and fine silver is a coating layer.It is of a size of: external diameter is Φ 20 μ m～Φ 1000 μ m, and the core filament diameter is Φ 10 μ m～Φ 950 μ m.Φ 70 μ m silver alclad microfilament cross-sectional structure is seen Fig. 1.
The present invention adopts the plug of the fine aluminium rod that has continuous cylindrical crystalline texture along its length of continuous directional solidification method preparation as composite blank, to improve the cold working large deformation harmony of fine silver and fine aluminium, the diameter of fine aluminium rod column crystal is 10～500 μ m, then, adopt and to carry out quiet liquid extruding and the multi-pass drawing process is prepared high-performance silver coated aluminum compound silk material.Its quiet liquid extruding and multi-pass drawing are as follows:
Quiet liquid extrusion process is:
(1) the blanking of fine silver pipe, termination after rolling are revolved awl, annealing, and carry out surfaces externally and internally and clean.
(2) blanking of fine aluminium rod, head car awl, surperficial alkali cleaning, water clean.
(3) cleaned fine silver pipe and fine aluminium rod are combined into composite blank, the blank afterbody is with the tailstock sealing and carry out the processing of blank surface coating.
(4) on hydrostatic extruder, adopt large extrusion ratio (10～20) cold extrusion to obtain silver-colored alclad composite wire.
This extruding wire rod is carried out follow-up multi-pass drawing processing.Pass reduction in the drawing course of processing is controlled at 5%～30%.Wherein, preceding 15 to 20 passages adopt big pass reduction 20%～30%, and later passage reduces successively with the working modulus that reduces of silk material diameter.Be respectively, pass reduction is 20%～30% between Φ 6mm～Φ 1mm; Pass reduction is 10%～20% between Φ 1mm～Φ 0.1mm; Pass reduction is 5%～15% between Φ 0.1mm～Φ 0.03mm.Total working modulus between twice softening annealing is 90%～98%.Annealing temperature is between 150 ℃～200 ℃.
For work hardening rate height, the cold deformation ability that solves fine aluminium is lower than fine silver, the problem of easy fracture of wire in the microfilament processing below Φ 0.1mm (Φ 100 μ m), the present invention adopt continuous directional solidification method preparation along its length on have the aluminium core of the fine aluminium bar of continuous cylindrical crystalline texture as silver-colored aluminium composite blank, carry out the silver-colored alclad composite wire of quiet liquid extruding preparation, receive good effect, can overcome the fracture of wire problem in external diameter Φ 20 μ m～Φ 100 μ m microfilament drawings.
The invention has the advantages that the hot strength test finds that the silk material has higher intensity; Examine under a microscope and find that silver-colored alclad silk material surface quality is good, silk material diameter is very little in the length direction fluctuation, and silver layer is evenly distributed.In conjunction with high conductivity of fine silver and the characteristics that fine aluminium is cheap, density is little, silver coated aluminum compound silk material has good application prospects in fields such as electronic information, Aero-Space.
Description of drawings
Fig. 1 is the silver-colored alclad silk material cross-sectional structure schematic diagram of a kind of dimensions (external diameter Φ 70 μ m, internal diameter Φ 49 μ m) of the present invention's preparation.Wherein, silver layer 1; Aluminium core 2.
Embodiment
With preparation Φ 70 μ m silver alclad microfilament is example, and its specific implementation method is described.Adopt the composite blank of fine silver pipe box dress aluminium bar as quiet liquid extruding.The length of fine silver pipe and fine aluminium rod is 100mm; The external diameter of fine silver pipe and internal diameter size are respectively Φ 20mm and Φ 14mm, and the diameter of fine aluminium rod is Φ 14mm.The fine silver tube head is revolved into 30 ° semi-cone angle, and fine aluminium club head car becomes 30 ° semi-cone angle.Clean fine silver pipe and fine aluminium rod with rare nitric acid, the fine silver pipe internal surface is polished, the friction between its inner surface and the fine aluminium rod is increased with crosus cloth.Then fine aluminium rod and fine silver pipe box are dressed up composite blank, and its afterbody is sealed with tailstock.Coat castor oil at the fine silver tube outer surface at last and push as lubricant, wherein, the extruding modular angle is 45 °, and extrusion ratio is 11.1.The diameter of extruding back wire rod is Φ 6mm.
The Φ 6mm wire rod of extruding preparation is drawn to Φ 1.7mm through multi-pass, and wherein pass reduction is controlled at 20%～30%; 200 ℃ of annealing 5 minutes; Be drawn to Φ 0.28mm from Φ 1.7mm through multi-pass again, pass reduction is controlled at 10%～20%; 150 ℃ of annealing 5 minutes.Finally be drawn to final size Φ 70 μ m from Φ 0.28mm through multi-pass, pass reduction is controlled at 10%～15%.
The compound microfilament of silver-colored alclad through above prepared is carried out the hot strength test find that microfilament has higher intensity; Examine under a microscope discovery, silver-colored alclad microfilament surface quality is good, and the microfilament diameter is very little in the length direction fluctuation, and silver thickness is evenly distributed.
Claims (1)
1, a kind of technology for preparing silver coated aluminum compound silk material, it is characterized in that, adopt the plug of the fine aluminium rod that has continuous cylindrical crystalline texture along its length of continuous directional solidification method preparation as composite blank, to improve the cold working large deformation harmony of fine silver and fine aluminium, the diameter of fine aluminium rod column crystal is 10～500 μ m, then, adopt and to carry out quiet liquid extruding and the multi-pass drawing process is prepared high-performance silver coated aluminum compound silk material; Wherein, quiet liquid extrusion process is:
Adopt the composite blank of fine silver pipe box dress aluminium bar as quiet liquid extruding, the length of fine silver pipe and fine aluminium rod is 100mm; The external diameter of fine silver pipe and internal diameter size are respectively Φ 20mm and Φ 14mm, and the diameter of fine aluminium rod is Φ 14mm; The fine silver tube head is revolved into 30 ° semi-cone angle, and fine aluminium club head car becomes 30 ° semi-cone angle; Clean fine silver pipe and fine aluminium rod with rare nitric acid, the fine silver pipe internal surface is polished, the friction between its inner surface and the fine aluminium rod is increased with crosus cloth; Then fine aluminium rod and fine silver pipe box are dressed up composite blank, and its afterbody is sealed with tailstock; Coat castor oil at the fine silver tube outer surface at last and push as lubricant, wherein, the extruding modular angle is 45 °, and extrusion ratio is 11.1, and the diameter of extruding back wire rod is Φ 6mm;
Wherein, the multi-pass drawing process is:
The Φ 6mm wire rod of extruding preparation is drawn to Φ 1.7mm through multi-pass, and wherein pass reduction is controlled at 20%-30%; 200 ℃ of annealing 5 minutes; Be drawn to Φ 0.28mm from Φ 1.7mm through multi-pass again, pass reduction is controlled at 10%-20%; 150 ℃ of annealing 5 minutes; Finally be drawn to final size Φ 70 μ m from Φ 0.28mm through multi-pass, pass reduction is controlled at 10%-15%.
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102723144B (en) * | 2012-06-19 | 2013-12-18 | 西北有色金属研究院 | Method for preparing Cu-Ag multi-core composite wire |
| CN105575472B (en) * | 2016-01-08 | 2018-10-19 | 长沙理工大学 | A kind of silver alclad composite flat microfilament and preparation method thereof |
| CN105642698B (en) * | 2016-01-08 | 2018-02-16 | 长沙理工大学 | A kind of silver-colored alclad composite microwires preparation method |
| CN105869771A (en) * | 2016-04-01 | 2016-08-17 | 罗奕兵 | Preparation method for silver-coated aluminum composite thin wires |
| CN105913969A (en) * | 2016-04-22 | 2016-08-31 | 罗奕兵 | Preparation method for copper clad aluminum composite filament |
| CN105750356A (en) * | 2016-04-22 | 2016-07-13 | 罗奕兵 | Preparation method of silver clad aluminum composite filament |
| CN105772612B (en) * | 2016-05-13 | 2018-06-05 | 北京科技大学 | A kind of preparation method of gold copper-clad composite filament |
| CN107958746A (en) * | 2017-11-02 | 2018-04-24 | 中天科技装备电缆有限公司 | A kind of more core flame-retardant flexible electric cables of silver alclad and its manufacture method |
| CN108043894A (en) * | 2017-12-15 | 2018-05-18 | 桂林金格电工电子材料科技有限公司 | A kind of siller tin oxide covers the preparation method of copper strip |
| CN110277188A (en) * | 2019-07-09 | 2019-09-24 | 贵研铂业股份有限公司 | A kind of ultra-fine compound flexible circuit conductor of silver-colored alclad and preparation method thereof of low-density |
| CN111590275A (en) * | 2020-05-26 | 2020-08-28 | 西安瑞鑫科金属材料有限责任公司 | Preparation method of metal-based composite conductor blank |
| CN113823435B (en) * | 2021-09-08 | 2024-04-23 | 湖州金钛导体技术有限公司 | Composite electrode wire, preparation method and application thereof |
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| 铜包铝复合线材静液挤压加工工艺研究. 胡捷.新技术新工艺，第9期. 2001 |
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