Preparation method for flaky AgSnO2 contact

A silver tin oxide, flake technology, applied in the direction of cable/conductor manufacturing, electrical components, circuits, etc., can solve the problems of high technical difficulty, high manufacturing cost, adverse effects of additive distribution uniformity, etc., to ensure distribution uniformity, Effect of avoiding structural defects and improving tissue uniformity

Active Publication Date: 2014-03-19
桂林金格电工电子材料科技有限公司
View PDF7 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 uniformly distributed in the Ag matrix, making 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 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 pure 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 also 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method for flaky AgSnO2 contact
  • Preparation method for flaky AgSnO2 contact
  • Preparation method for flaky AgSnO2 contact

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 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;

[0041] 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 20r / min, and then placed in a V-shaped mixer and mixed for 3 hours at a speed of 35r / min to obtain AgSnO 2 mixed powder;

[0042] 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;

[0043] 4) Place the ingot in a box-type resistance furnace, heat-preserve and sinter it in air at 850°C for 2 hours, and ...

Embodiment 2

[0050] 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;

[0051] 2) Weigh the -300 mesh Ag alloy powder prepared in the above step 1) and the SnO 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 20r / min, and then placed in a V-shaped mixer and mixed for 3 hours at a speed of 35r / min to obtain AgSnO 2 mixed powder;

[0052] 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;

[0053] 4) Place the ingot in a high-pressure oxidation furnace, and heat-preserve and sinter it at 870°C for 3 ...

Embodiment 3

[0060] 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;

[0061] 2) Weigh the -300 mesh Ag alloy powder prepared in the above step 1) and the SnO 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 20r / min for 1.5h, and then placed in a V-shaped mixer and mixed at a speed of 35r / min for 2.5h to obtain AgSnO 2 mixed powder;

[0062] 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;

[0063] 4) Place the ingot in a high-pressure oxidation furnace, heat-preserve and sinter it for 4 hours at an oxygen ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention discloses a preparation method for a flaky AgSnO2 contact. The method comprises the following steps of smelting 0.2 to 2 mass percent of metal additive and the balance of Ag in an intermediate-frequency smelting furnace to form a molten alloy, and performing atomization to prepare Ag alloy powder; mixing the Ag alloy powder with SnO2 powder in a three-dimensional mixer, and mixing the mixture in a V-shaped mixer to obtain mixed AgSnO2 powder; preparing an ingot blank from the mixed AgSnO2 powder according to a conventional method, sintering the ingot blank at high temperature in an oxygen-containing atmosphere, and performing hot extrusion and hot-rolling bonding to obtain a composite AgSnO2 / Ag strip; performing cold rolling, finish rolling and press forming on the composite AgSnO2 / Ag strip to obtain the required flaky AgSnO2 contact. The flaky AgSnO2 contact prepared by the method has the advantages of uniform distribution of SnO2 particles and a trace of additive, stable electrical properties and the like, and a process is simple and suitable for batch production.

Description

technical field [0001] The invention relates to the field of metal matrix composite materials, in particular to a method for preparing a silver tin oxide sheet contact. 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 materials that replace 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 it is difficult to surpass AgCdO materials in performance. 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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C22C5/06C22C32/00C22C1/05H01B13/00
Inventor 黄锡文叶凡覃绍培陈光明李镇鹏崔建华侯月宾
Owner 桂林金格电工电子材料科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap