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Preparation method for silver tin oxide electrical contact material

An electrical contact material, silver tin oxide technology, used in contacts, circuits, electrical switches, etc., can solve the problems of long internal oxidation time, poor material processing performance, low density of contact materials, etc., and achieve uniform and stable contact composition. , to ensure consistency, the effect of improving processing performance

Active Publication Date: 2012-01-11
ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] By comparing the common AgSnO 2 Contact preparation methods can be classified into two types, one is to prepare AgSnO 2 powder, and then through various methods, improve the AgSnO 2 Density, thus preparing AgSnO 2 Contact material, AgSnO prepared by this method 2 There are two problems with the material, one is that the processing performance of the material is poor, and the other is that the density of the contact material is lower than that of the alloy internal oxidation method; the other method is to prepare AgSn alloy wire or plate through alloy melting, and then through the internal oxidation method Prepared AgSnO 2 For contact materials, there are also two problems in this type of method. One is that the Sn-poor phenomenon in the center of the product will appear during the internalization process of the material. longer time

Method used

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  • Preparation method for silver tin oxide electrical contact material
  • Preparation method for silver tin oxide electrical contact material
  • Preparation method for silver tin oxide electrical contact material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] AgSnO 2 (8) In2O3(4) material preparation as an example

[0036] 1. Put 17.6kg of silver ingot in an intermediate frequency heating furnace, heat it to 1100°C-1200°C until Ag is completely melted, then cool down to 1000°C, add 1.26kg of tin ingot and 0.662kg of indium ingot, after melting, refine 10 minute;

[0037] 2. Under the air pressure of 8±1MPa, gas atomization powder making;

[0038] 3. AgSnIn alloy powder is made into ingot under 150MPa isostatic pressure;

[0039] 4. The AgSnIn alloy powder ingot was sintered in a hydrogen furnace for 4 hours at a temperature of 680°C;

[0040] 5. The AgSnIn alloy powder ingot is extruded on a 1100t extruder to prepare an AgSnIn alloy powder plate with a cross-sectional specification of 40X4mm;

[0041] 6. The AgSnIn alloy powder sheet is prepared by hot-rolling and silver-coating process into AgSnIn / Ag sheet with silver layer;

[0042] 7. The AgSnIn / Ag plate is cold-rolled and punched to prepare square sheet products;

...

Embodiment 2

[0046] AgSnO 2 (14)In 2 o 3 (1) Material preparation as an example

[0047] 1. Put 17kg of silver ingot in an intermediate frequency heating furnace, heat it to 1100°C-1200°C until Ag is completely melted, then cool down to 1000°C, add 2.207kg of tin ingot and 0.0.179kg of indium ingot, after melting, refine 10 minute;

[0048] 2. Under the pressure of 40±2MPa atomized water, atomize and make powder;

[0049] 3. AgSnIn alloy powder is made into ingot under 150MPa isostatic pressure;

[0050] 4. The AgSnIn alloy powder ingot was sintered in a hydrogen furnace for 4 hours at a temperature of 680°C;

[0051] 5. The AgSnIn alloy powder ingot is extruded on a 1100t extruder to prepare an AgSnIn alloy powder plate with a cross-sectional specification of 30X5mm;

[0052] 6. The AgSnIn alloy powder sheet is prepared by hot-rolling and silver-coating process into AgSnIn / Ag sheet with silver layer;

[0053] 7. The AgSnIn / Ag plate is cold-rolled and punched to prepare square sheet...

Embodiment 3

[0057] AgSnO 2 (12) Bi 2 o 3 (0.5) Material preparation as an example

[0058] 1. Put 17.5kg of silver ingot in an intermediate frequency heating furnace, heat it to 1100°C-1200°C until Ag is completely melted, then cool down to 1000°C, add 1.89kg of tin ingot and 0.090kg of bismuth ingot, after melting, refine 10 minute;

[0059] 2. Under the pressure of 40±2MPa atomized water, atomize and make powder;

[0060] 3. AgSn alloy powder is made into ingot under 150MPa isostatic pressure;

[0061] 4. The AgSn alloy powder ingot was sintered in a hydrogen furnace for 4 hours at a temperature of 680°C;

[0062] 5. AgSn alloy powder ingots are extruded on a 1100t extrusion machine to prepare AgSn alloy powder materials with a cross-sectional specification of Φ6.0;

[0063] 6. After the AgSn alloy fan material is drawn to Φ2.0, it is placed in an internal oxidation furnace for internal oxidation. The internal oxidation process is: internal oxidation into AgSnO at a temperature of...

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Abstract

The invention discloses a preparation method for a silver tin oxide electrical contact material, which comprises the following steps: by taking a silver ingot, a tin ingot, an indium ingot and an additive ingot as raw materials, atomizing the raw materials to prepare a silver tin alloy powder; ingoting, sintering, extruding and drawing / rolling the silver tin alloy powder to prepare a wire material or a sheet plate or a belt material; and finally, carrying out internal oxidation to prepare the silver tin oxide electrical contact material. The preparation method for the silver tin oxide electrical contact material has the characteristics of uniform and stable contact material components, no conventional internally oxidized central lean oxidation zone, high density, high hardness and the like. The preparation method for the silver tin oxide electrical contact material has a simple process and is suitable for mass production. A prepared silver tin oxide product can be widely used for relays and contactors.

Description

technical field [0001] The invention relates to a preparation method of silver tin oxide electrical contact material, which is mainly used in the production of contact material for low-voltage electrical appliances. Background technique [0002] AgSnO 2 Due to its excellent anti-welding performance, high electrical life performance and environmental protection performance, contact materials have been increasingly used in electrical appliances instead of AgCdO contacts, and AgSnO has been initially completed in developed countries in Western Europe. 2 Works instead of AgCdO. Domestic and foreign AgSnO 2 The main production process of contacts is divided into three processes: powder mixing method, internal oxidation method and chemical method. Among them, the mixed powder method is to mix Ag powder, SnO 2 And the additive powder powder is fully mixed, and then the material is extruded and molded to prepare AgSnO 2 Contact materials; the internal oxidation method can be di...

Claims

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Application Information

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IPC IPC(8): C22C5/06C22C32/00C22C1/04H01H1/0237
Inventor 刘立强柏小平翁桅颜小芳
Owner ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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