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Method for preparing AgSnO2 wire

A technology of silver tin oxide and wire rod, applied in the field of preparation of silver tin oxide wire rod, can solve the problems of high manufacturing cost, adverse effect of additive distribution uniformity, high technical difficulty, etc., to avoid structural defects, improve tissue uniformity, guarantee The effect of distribution uniformity

Active Publication Date: 2014-03-19
桂林金格电工电子材料科技有限公司
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Problems solved by technology

However, the above-mentioned traditional mechanical powder mixing method has obvious shortcomings, mainly because it is difficult to mix the trace additive powder with a mass percentage of no more than 2% with SnO 2 Powder and Ag powder are uniformly mixed, resulting in that the additive particles in the final material cannot be evenly distributed on the Ag matrix, so that the AgSnO 2 The performance level and performance stability of the contact material are greatly reduced
After review, in view of the lack of uneven distribution of additives in the traditional mechanical powder mixing method, researchers have improved the method of adding additives. For example, the invention patent with publication number CN101964260A discloses an Ag / SnO 2 Electric contact material and preparation method thereof, which adopts smelting and electromagnetic gasification method to prepare Sb-containing 2 o 3 、 Bi 2 o 3 or In 2 o 3 Composite nano-SnO 2 powder, and then the composite nano-SnO 2 Powder mixed with Ag powder to get AgSnO 2 The method of mixing powder; another example is the invention patent of publication number CN102268583A, which discloses a preparation method of silver tin oxide electrical contact material. The Sn alloy powder of the material, and then the alloy powder is oxidized to obtain the Sn oxide composite powder (that is, SnO containing metal oxide additives 2 powder), and then mix Sn oxide composite powder with Ag powder to obtain AgSnO 2 Method of mixing powder
The above two kinds of additives are added to SnO in advance 2 powder, then SnO 2 powder mixed with Ag powder to obtain AgSnO 2 The method of mixing powder can improve the distribution uniformity of additives to a certain extent, however, due to the impact of mechanical powder mixing on SnO 2 The particle size distribution and particle morphology of powder have higher requirements than that of Ag powder. The above two improved processes put forward high requirements on powder making equipment, powder particle size control equipment and classification technology. Not only the technology is difficult, but the manufacturing cost is also high. high
On the other hand, even if additives can be added to SnO in advance 2 powder, due to the general situation of SnO 2 with additives in AgSnO 2 The total mass percentage in the material does not exceed 18%, which belongs to the minority phase in the material, and it is easy to appear that there is a lack of SnO in a certain area when mixing powder 2 The phenomenon of powder particles, which will have an adverse effect on the distribution uniformity of the additive in the Ag matrix, resulting in the additive not being able to fully function when the contact is working

Method used

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  • Method for preparing AgSnO2 wire
  • Method for preparing AgSnO2 wire
  • Method for preparing AgSnO2 wire

Examples

Experimental program
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Effect test

Embodiment 1

[0036] 1) Weigh 19.96kg of pure Ag block and 0.04kg of pure Bi block, place them in an intermediate frequency induction melting furnace to melt into a uniform alloy melt, and then atomize through high-pressure water atomization equipment, and the obtained powder slurry Dried and passed through a 300-mesh sieve;

[0037] 2) Weigh the -300 mesh Ag alloy powder prepared in the above step 1) and the SnO powder with an average particle size (D50) of 1 μm according to the mass ratio of 92%:8%. 2 powder, placed in a three-dimensional mixer and mixed for 2 hours at a speed of 20 rpm, and then placed in a V-shaped mixer and mixed for 3 hours at a speed of 35 rpm to obtain AgSnO 2 mixed powder;

[0038] 3) placing the above-mentioned mixed powder in an isostatic press and forming under a pressure of 130MPa to obtain a cylindrical ingot with a diameter of φ85mm;

[0039] 4) Place the ingot in a box-type resistance furnace, heat-preserve and sinter it in air at 850°C for 2 hours to obta...

Embodiment 2

[0043] 1) Weigh 19.8kg of pure Ag block, 0.14kg of pure Bi block and 0.06kg of pure Cu block, place them in an intermediate frequency induction melting furnace to melt into a uniform alloy melt, and then atomize them through high-pressure water atomization equipment , drying the obtained powder slurry and passing through a 300-mesh sieve;

[0044] 2) Weigh the -300 mesh Ag alloy powder prepared in the above step 1) and the SnO powder with an average particle size (D50) of 3 μm according to the mass ratio of 88%:12%. 2 powder, placed in a three-dimensional mixer and mixed for 2 hours at a speed of 20 rpm, and then placed in a V-shaped mixer and mixed for 3 hours at a speed of 35 rpm to obtain AgSnO 2 mixed powder;

[0045] 3) Place the mixed powder above in an isostatic press and form it under a pressure of 150MPa to obtain a cylindrical ingot with a diameter of φ85mm;

[0046] 4) Place the ingot in a high-pressure oxidation furnace, and heat-preserve and sinter it at 870°C f...

Embodiment 3

[0050] 1) Weigh 19.6kg of pure Ag block, 0.14kg of pure Bi block and 0.26kg of pure In block, place them in an intermediate frequency induction melting furnace to melt into a uniform alloy melt, and then atomize them through high-pressure water atomization equipment , drying the obtained powder slurry and passing through a 300-mesh sieve;

[0051] 2) Weigh the -300 mesh Ag alloy powder prepared in the above step 1) and the SnO powder with an average particle size (D50) of 5 μm according to the mass ratio of 86%:14%. 2 powder, placed in a three-dimensional mixer and mixed at a speed of 20 rpm for 1.5 hours, and then placed in a V-shaped mixer and mixed for 2.5 hours at a speed of 35 rpm to obtain AgSnO 2 mixed powder;

[0052] 3) Place the above mixed powder in an isostatic press and form it under a pressure of 180MPa to obtain a cylindrical ingot with a diameter of φ85mm;

[0053] 4) Place the ingot in a high-pressure oxidation furnace, heat-preserve and sinter it for 4 hour...

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Abstract

The invention discloses a method for preparing an AgSnO2 wire. The method comprises the following steps: smelting 0.2-2 percent by mass of metal additive and the balance of Ag into alloy melt in an intermediate frequency smelting furnace, and atomizing to prepare Ag alloy powder, wherein the metal additive is selected from one or more of Bi, Cu, In and Sb; mixing the Ag alloy powder and SnO2 powder in a three-dimensional mixer, mixing the mixture in a V-shaped mixer to obtain mixed AgSnO2 powder; preparing the mixed AgSnO2 powder into an ingot blank according to a conventional method, sintering the ingot blank at high temperature in an oxygen-containing atmosphere, and performing hot extrusion and drawing to obtain the AgSnO2 wire. The AgSnO2 wire prepared by the method has the advantages that the SnO2 particles and trace additives are uniform in distribution, the material processability is excellent, the electrical performance is stable and the like, and the preparation method is simple in process and suitable for batch production.

Description

technical field [0001] The invention relates to the field of metal matrix composite materials, in particular to a preparation method of silver tin oxide wire. Background technique [0002] Silver tin oxide (AgSnO 2 ) is made of silver (Ag) and tin oxide (SnO 2 ) is a metal matrix composite material made as the main component, and it is also a new generation of non-toxic and environmentally friendly electrical contact material that replaces toxic silver cadmium oxide (AgCdO) in low-voltage electrical appliances. Studies have shown that AgSnO without any additives 2 When the material is applied to low-voltage electrical appliances, it often cannot meet the requirements of electrical appliances in terms of contact resistance, arc erosion resistance and welding resistance, and sometimes it is even inferior to AgCdO materials. Through years of research, it was found that by adding AgSnO 2 Adding a small amount of metal oxides (such as bismuth oxide (Bi 2 o 3 ), copper oxide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/04C22C5/06C22C32/00
Inventor 黄锡文叶凡陈光明崔建华覃向忠李镇鹏侯月宾
Owner 桂林金格电工电子材料科技有限公司
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