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Method for preparing silver tin oxide electrical contact

A technology of silver tin oxide and electrical contacts, which is applied in the direction of circuits, electrical switches, electrical components, etc., can solve the problems of low density in powder metallurgy process, shorten oxidation time, improve internal oxidation efficiency, improve material utilization and use The effect of longevity

Active Publication Date: 2013-04-17
ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and provide a new method for preparing silver tin oxide electrical contacts, which has the advantages of fine and uniform particles in the internal oxidation process and high utilization rate of powder metallurgy process materials At the same time, it can completely avoid or improve the disadvantages of "poor oxide zone" and low density of powder metallurgy process in internal oxidation process

Method used

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  • Method for preparing silver tin oxide electrical contact

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Effect test

Embodiment 1

[0023] 1. Preparation of AgSnO by atomized alloy powder AgSn 2 The product of (12) is well weighed according to the AgSn weight of theoretically required 38.3g, adopts compression molding, and the relative density of the initial pressure compact is 65%;

[0024] 2. Put the green compact in a hydrogen atmosphere at 450°C for 2 hours, and take it out after cooling;

[0025] 3. Put the green body treated with hydrogen atmosphere into an internal oxidation furnace with an oxygen pressure of 0.95MPa, control the temperature at 700°C, and oxidize for 24 hours;

[0026] 4. Heat the oxidized green body at 880°C for 4 hours in air for sintering;

[0027] 5. Heat the sintered body to 860°C in the air and keep it warm for 15 minutes. At the same time, heat the recompression mold to 300°C and keep it warm;

[0028] 6. Put the heated green body into the mold cavity for pressing, the unit pressing pressure is 12T, keep the pressure for 5-10 seconds, and take out the product after releasin...

Embodiment 2

[0031] 1. Preparation of AgSnO by atomized alloy powder AgSn 2 The product of (12), according to the AgSn weight weighing of theoretically required 38.3g, adopts compression molding, and the relative density of the initial pressure compact is 75%;

[0032] 2. Put the compact into the hydrogen atmosphere and treat it at 550°C for 2 hours, and take it out after cooling;

[0033] 3. Put the green body treated with hydrogen atmosphere into an internal oxidation furnace with an oxygen pressure of 0.95MPa, the temperature is generally controlled at 700°C, and oxidize for 24 hours;

[0034] 4. Heat the oxidized green body at 880°C for 4 hours in air for sintering;

[0035] 5. Heat the sintered green body to 860°C in the air and keep it warm for 15 minutes, and at the same time heat the recompression mold to 300°C;

[0036] 6. Put the heated green body into the mold cavity for pressing, the unit pressing pressure is 12T, keep the pressure for 5-10 seconds, take out the product after...

Embodiment 3

[0039] 1. Preparation of AgSnO by atomized alloy powder AgSn 2 The product of (12), according to the AgSn weight weighing of theoretically required 38.3g, adopts compression molding, and the relative density of the initial pressure compact is 85%;

[0040] 2. Put the green compact in a hydrogen atmosphere at 600°C for 2 hours, and take it out after cooling;

[0041] 3. Put the green body treated with hydrogen atmosphere into an internal oxidation furnace with an oxygen pressure of 0.95MPa, the temperature is generally controlled at 700°C, and oxidize for 24 hours;

[0042] 4. Heat the oxidized green body at 880°C for 4 hours in air for sintering;

[0043] 5. Heat the sintered green body to 860°C in the air and keep it warm for 15 minutes, and at the same time heat the recompression mold to 300°C;

[0044] 6. Put the heated green body into the mold cavity for pressing, the unit pressing pressure is 12T, keep the pressure for 5-10 seconds, and take out the product after releas...

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Abstract

The invention discloses a method for preparing a silver tin oxide electrical contact. The method comprises the following steps of: forming a pressed blank by using silver and tin alloy powder through a die pressing mode, wherein the relative density of the pressed blank is 65 to 85 percent; treating the formed pressed blank under a hydrogen atmosphere at 350 to 600 DEG C for 1 to 3 hours; then placing the treated pressed blank into an oxidization furnace with oxygen pressure of 0.02 to 1.5 MPa and temperature of 500 to 750 DEG C for oxidization; and in order to obtain the silver tin oxide electrical contact with high density, sintering a blank body subjected to inner oxidization in air at 700 to 900 DEG C, thermally repressing the blank body at 500 to 900 DEG C, and thus obtaining the electrical contact product with the relative density of over 99 percent. The silver tin oxide electrical contact prepared by using the method has small silver tin oxide particles and uniform metallographic structure and has the advantages of an inner oxidization process; and a 'poor oxide bright band' does not exist.

Description

technical field [0001] The invention relates to a method for manufacturing an electric contact of a low-voltage electrical product, in particular to a method for preparing an electric contact of silver tin oxide. Background technique [0002] At present, most of the electrical products with medium and small currents in the low-voltage electrical industry use silver-based materials as electrical contact materials. Silver-based materials have good electrical conductivity and thermal conductivity, and have a certain resistance to electrical corrosion, but pure silver has low hardness and poor electrical wear resistance. Therefore, it is generally necessary to add a second phase of MeO (metal oxide) to the silver matrix in order to prepare electrical contact materials that meet the requirements of good welding resistance, arc burn resistance and wear resistance. [0003] There are usually two processes used to produce such silver metal oxide electrical contacts: powder metallu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/16H01H11/04
Inventor 谢继峰刘立强颜小芳郑宁翁桅林万焕
Owner ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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