Method for preparing tin oxide reinforced silver-based electrical contact materials

An electrical contact material, tin oxide technology, which is applied to contacts, circuits, electrical switches, etc., can solve the problems of increased material production scrap rate, poor processing performance, and rising production costs, so as to solve processing difficulties and reduce production costs. , The effect of improving the yield of materials

Active Publication Date: 2011-11-09
WENZHOU HONGFENG ELECTRICAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, SnO is prone to appear on the surface of Ag-Sn alloy powder due to the reverse diffusion of Sn element during the powder pre-oxidation preparation process. 2 Particle aggregation phenomenon, so it is easy to form SnO 2 In the case of Ag-coated particles, SnO is easy to form during powder metallurgy processing 2 Isolate the structure of the Ag matrix, resulting in poor processability, prone to cracking in the subsequent drawing or rolling process, so that Ag-SnO 2 Material production scrap rate increases, production costs rise

Method used

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  • Method for preparing tin oxide reinforced silver-based electrical contact materials
  • Method for preparing tin oxide reinforced silver-based electrical contact materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1 to prepare Ag-18SnO 2 material example

[0033] 1. Weigh 18Kg of silver ingot and 3.4Kg of Sn, and place them in an intermediate frequency induction furnace for melting. The melting temperature is 950°C;

[0034] 2. Then atomize powder, that is, use high-pressure nitrogen to impact and atomize the molten metal flow into small metal droplets, and then cool to obtain powder; the nitrogen pressure is 10MPa;

[0035] 3. Put the atomized powder into a high-pressure container and heat it to 850°C for pre-oxidation, the oxygen pressure is 0.1MPa, and oxidize for 10 hours;

[0036] 4. The oxidized powder is pickled with 5% hydrochloric acid with a mass ratio concentration. The cleaning time is 10 minutes. The mass of hydrochloric acid: the mass of powder = 1: 1, that is, the weight of hydrochloric acid is 18+4=22kg.

[0037] 5. Dry the cleaned powder in air. The drying temperature is 150° C. and the drying time is 12 hours.

[0038] 6. Press the oxidized powder i...

Embodiment 2

[0043] Example two to prepare Ag-3SnO 2 material example

[0044] 1. Weigh 25Kg of silver ingot and 0.6Kg of Sn, and place it in an intermediate frequency induction furnace for melting. The melting temperature is 1300°C;

[0045] 2. Then atomize powder, that is, use high-pressure nitrogen to impact and atomize the molten metal flow into small metal droplets, and then cool to obtain powder; the nitrogen pressure is 0.5MPa;

[0046] 3. Put the atomized powder into a high-pressure container and heat it to 450°C for pre-oxidation, the oxygen pressure is 3MPa, and oxidize for 1h;

[0047] 4. The oxidized powder is pickled with 20% hydrochloric acid with a mass ratio concentration, and the cleaning time is 5 minutes. The mass of hydrochloric acid: powder mass=1:5, and the weight of hydrochloric acid is (25+1)×1 / 5=5.2kg .

[0048] 5. Dry the cleaned powder in air. The drying temperature is 90°C and the drying time is 24h.

[0049] 6. Press the oxidized powder into a green body ...

Embodiment 3

[0054] Example three to prepare Ag-10SnO 2 material example

[0055] 1. Weigh 18Kg of silver ingot and 1.5Kg of Sn, and place them in an intermediate frequency induction furnace for melting. The melting temperature is 1100°C;

[0056] 2. Then atomize powder, that is, use high-pressure nitrogen to impact and atomize the molten metal flow into small metal droplets, and then cool to obtain powder; the nitrogen pressure is 4MPa;

[0057] 3. Put the atomized powder into a high-pressure container and heat it to 650°C for pre-oxidation, the oxygen pressure is 2MPa, and oxidize for 5h;

[0058] 4. The oxidized powder is pickled with 10% hydrochloric acid by mass ratio concentration, the cleaning time is 8 minutes, hydrochloric acid mass: powder mass=1:3, i.e. (18+2)×1 / 3=6.7kg hydrochloric acid.

[0059] 5. Dry the cleaned powder in air. The drying temperature is 100°C and the drying time is 18h.

[0060] 6. Press the oxidized powder into a green body under isostatic pressure of 300...

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Abstract

The invention discloses a method for preparing tin oxide reinforced silver-based electrical contact materials. The method comprises the following steps: firstly, pre-oxidizing the Ag-Sn alloy powder; carrying out surface treatment on the pre-oxidized Ag-Sn alloy powder to make the powder have a layer of surface alloy layer with good plastic; and then combining a subsequent powder densification means to obtain silver tin oxide materials. The method has the advantages of reducing the phenomenon that SnO2 particles covers the metal Ag and eliminating the occurrence of SnO2 particle isolation belt, thereby contributing to the solving of the problem that the subsequent processing of Ag-SnO2 materials is difficult, improving the processing performance of Ag-SnO2, and reducing the production costs. The silver tin oxide material SnO2 particles prepared by the method have reinforced phase dispersion and distribution, and have good mechanical and electrical contact properties.

Description

technical field [0001] The present invention relates to a method for preparing an electrical contact material, in particular to a method for preparing a tin oxide-reinforced silver-based electrical contact material. Electrical contacts used in switches and bimetallic composite rivets, sheets, etc. Background technique [0002] With the development of electrical products in the direction of large capacity and small volume, the requirements for electrical contact materials are increasing --- the materials are required not to undergo welding, mechanical and electrical wear resistance under conditions of extreme arc heat and Joule heat It is good; less metal spatter is generated during the breaking process, and the arcing time is short; in a DC environment, it has good welding resistance, less material transfer, and low and stable contact resistance. Silver cadmium oxide material has excellent electrical contact performance, but its use is increasingly restricted due to its hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H11/04H01H1/0237B22F3/16B22F9/08C22C1/05C22C5/06C22C32/00C22F1/14
Inventor 陈晓甘可可祁更新陈乐生
Owner WENZHOU HONGFENG ELECTRICAL ALLOY
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