Preparation method of silver/silver alloy microwire

A silver alloy and micro-wire technology, applied in the direction of metal/alloy conductors, cable/conductor manufacturing, electrical components, etc., can solve the problems of fracture, fracture strength drop, poor bonding performance, etc., to improve collection efficiency, reduce use costs, The effect of good mechanical properties

Inactive Publication Date: 2014-03-05
苏州衡业新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Large silver wire size (for example, greater than 20μm) will cause the electrode line width to increase; moreover, silver wire with larger size and higher hardness has poor bonding performance with silver paste during sintering, and is easy to warp and fall off, seriously affecting When the size is small, its fracture strength will drop sharply. If the mechanical properties cannot meet the process requirements, it is easy to break during the electrode dispensing process, which seriously affects the continuity and efficiency of production, making the process unpractical. , and in the actual production of photovoltaic cells, the total defect rate of various factors in the whole process should be <3%
The diameter of the silver wire currently used for bonding is usually 20-25 μm, and the alloy composition and mechanical properties of the material, and the interface bonding state with the silver paste after sintering, cannot well meet the requirements of the front electrode of Si solar photovoltaic panels. requirements for use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: a kind of preparation method of silver and silver alloy fine wire,

[0028] The first step, silver / silver alloy smelting and continuous casting:

[0029] In a vacuum smelting furnace, at a temperature of 1100°C, after weighing Ag, In, Cu, Sn, and Zn alloy elements according to the following ratios, Among them, silver (Ag) is 100% , The purity of Ag is 99.99%, Mix and add to the vacuum smelting furnace. After the alloy components are dissolved, turn on the electromagnetic stirring, stir at a frequency of 10-15kHz for 10 minutes, cool and solidify the alloy melt, and repeat the above steps for three times to ensure the uniformity of the alloy; The evenly smelted alloy is controlled at a temperature of 1000-1400°C, in an atmosphere protected by argon, and continuously cast into silver / silver alloy rods with a diameter of 6mm by means of down-drawing;

[0030] The second step, large and medium pulling of silver / silver alloy rods:

[0031] The above-mentio...

Embodiment 2

[0035] Embodiment 2: a kind of preparation method of silver and silver alloy fine wire,

[0036] The first step, silver / silver alloy smelting and continuous casting:

[0037] In a vacuum smelting furnace, at a temperature of 1100°C, after weighing Ag, In, Cu, Sn, and Zn alloy elements according to the following ratios, Among them, silver (Ag) is 96%; indium (In) is 0.5%; copper (Cu) is 1.0%; tin (Sn) is 0.5%; zinc (Zn) is 1.5% , Among them, the purity of Ag is 99.99%, and the purity of other alloys is 95.95%. Mix and add to the vacuum smelting furnace. After the alloy components are dissolved, turn on the electromagnetic stirring, stir at a frequency of 10-15kHz for 10 minutes, cool and solidify the alloy melt, and repeat the above steps for three times to ensure the uniformity of the alloy; The evenly smelted alloy is controlled at a temperature of 1000-1400°C, in an argon-protected atmosphere, and continuously cast into a silver / silver alloy rod with a diameter of 10mm; ...

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Abstract

The invention discloses a preparation method of silver / silver alloy microwire. The preparation method comprises the following steps: adding metallic elements with the concentration of 0-4wt% such as metal indium (In), copper (Cu), stannum (Sn) and zinc (Zn) to metal Ag with the high purity of 99.99% so as to form alloy, carrying out continuous casting, coarse drawing, intermediate drawing, mini-fine drawing and micro-drawing on a sliver / sliver alloy material and annealing, thus obtaining the microwire with the minimum diameter of 0.010-0.020mm. The silver / silver alloy microwire is superfine in wire diameter, has good mechanical property and electrical property and meets the requirement on the tensile strength of the microwire in a layout process and the requirement on the processing property of a material required in photovoltaic cell mass production. The silver / silver alloy microwire does not warp and fall off in sintering and annealing processes, has good interfacial adhesion with silver paste after being sintered, and can be applied to front electrode materials of Si solar photovoltaic cells.

Description

[0001] technical field [0002] The invention relates to the technical field of manufacturing front electrodes of silicon solar photovoltaic cells, in particular to a method for preparing silver and silver alloy fine wires used for the front electrodes of silicon solar photovoltaic cells. Background technique [0003] At present, the front electrodes of almost all monocrystalline silicon or polycrystalline silicon solar panels are printed with silver paste. Although the process of printing silver paste is very mature, this process still has some disadvantages to the performance of solar panels. However, there is still a need for further improvement. First of all, the line width of printed silver paste is relatively wide, and the current line width is in the range of 70-100 μm. The wider line width covers the area of ​​the Si battery plate, which reduces the effective use area, thus affecting the conversion efficiency of the battery plate. If the line width is reduced, it wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C5/06C22F1/14H01B1/02H01B13/00B21C1/02
Inventor 王一平王春华卢志强苗学阳
Owner 苏州衡业新材料科技有限公司
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