Preparation method of silver-metallic oxide electrical contact material

A technology of oxide electrodes and contact materials, which is applied in the direction of silver compounds, silver compounds, contact materials, etc., can solve the problems of Ag-MeO materials that are difficult to oxidize fully, shorten the production process, and the production process is long, so as to shorten the oxidation time , improve comprehensive performance, and solve the effect that is difficult to process

Inactive Publication Date: 2009-12-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the difficult problems of Ag-MeO materials, such as difficulty in fully oxidizing, difficult processing, and long production proc

Method used

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  • Preparation method of silver-metallic oxide electrical contact material
  • Preparation method of silver-metallic oxide electrical contact material
  • Preparation method of silver-metallic oxide electrical contact material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 2004 grams of silver, 112.5 grams of tin, and 76.5 grams of antimony, put them in an intermediate frequency induction furnace and melt them, then atomize the alloy with compressed air in the atomization equipment, and sieve the alloy powder after atomization, and the particle size is -325 mesh The powder is oxidized in an oxidation furnace, the oxidation temperature is controlled at 800°C, the oxygen pressure is kept at 50atm, and the oxidation is taken out for 6 hours, and molded into a green body with a diameter of 28mm and a relative density of 70%, and then the green body heated to 800°C is placed Put it into a mold that has been preheated to 500°C, and perform hot extrusion to obtain a product with a diameter of 4mm.

Embodiment 2

[0027] Take 2000 grams of silver, 223 grams of zinc, 105 grams of lanthanum, and 25 grams of yttrium. After melting in an intermediate frequency induction furnace, the alloy is atomized with compressed air in the atomization equipment. After atomization, the alloy powder is screened to determine the particle size. Put the -325 mesh powder into an oxidation furnace for oxidation, control the oxidation temperature at 400°C, keep the oxygen pressure at 10atm, take it out after oxidation for 3 hours, mold it into a green body with a diameter of 28mm and a relative density of 75%, and then heat it to 600°C Put the green body into the mold that has been preheated to 450 ℃, and after hot extrusion, a product with a diameter of 8 mm can be obtained.

Embodiment 3

[0029] Take 2000 grams of silver, 110.5 grams of copper, 82.9 grams of antimony, and 20 grams of cerium. After melting in an intermediate frequency induction furnace, the alloy is atomized with compressed air in the atomization equipment. After atomization, the alloy powder is screened to determine the particle size Put the -325 mesh powder into an oxidation furnace for oxidation, control the oxidation temperature at 700°C, keep the oxygen pressure at 25atm, take it out after oxidation for 5 hours, mold it into a green body with a diameter of 28mm and a relative density of 80%, and then heat it to 830°C Put the green body into the mold that has been preheated to 300 ℃, and after hot extrusion, a product with a diameter of 4 mm can be obtained.

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Abstract

The invention discloses a preparation method of a silver-metallic oxide electrical contact material, which comprises the following steps of: firstly preparing Ag-Me alloy powder with uniform ingredient 3 and fine granularity by a gas atomization method, then conducting internal oxidation on the powder to generate composite Ag-MeO powder, die-pressing the composite Ag-MeO powder into blanks, and adopting a powder hot extrusion technique to prepare the electrical contact material. The preparation method is characterized by low temperature of internal oxidation, short time and simple technique, solves the problem that the Ag-MeO material is difficult to process, reduces the production cost, improves the structure of the contact material and improves the comprehensive performance thereof simultaneously.

Description

technical field [0001] The invention belongs to the field of electrical functional materials, and relates to a manufacturing method of a silver-based electrical contact material. technical background [0002] The Ag-MeO contact material came out from the 1920s to the 1930s. In the late 1930s, F.R. Hensel and his collaborators produced the earliest Ag-CdO materials. In the late 1960s, Ag-SnO 2 , Ag-MeO contact materials such as Ag-ZnO have emerged one after another. Due to the excellent properties of Ag-CdO, it has been widely used in engineering. However, the "cadmium poisoning" pollution produced during the manufacture and use of Ag-CdO materials has attracted great attention from governments around the world. It is an important trend in the development of medium and low voltage electrical contact materials to develop new silver-metal oxides that can replace Ag-CdO contacts and further improve the properties of the alloy. But cadmium-free new Ag-SnO 2 , Ag-MeO contact m...

Claims

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Application Information

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IPC IPC(8): H01H11/04H01H1/02C22C1/05
CPCC01G39/00C01G9/00C01G5/00C01G30/00B22F2998/00H01H1/023C01G29/00B22F9/082
Inventor 易丹青李荐吴春萍王斌卢小东许灿辉
Owner CENT SOUTH UNIV
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