Preparation method for silver zinc oxide electrical contact

An electrical contact, silver cadmium oxide technology, applied in the field of electrical contact material preparation, can solve the problems of low density of powder metallurgy process and the like

Active Publication Date: 2012-01-25
ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 preparation method of silver-zinc 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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  • Preparation method for silver zinc oxide electrical contact
  • Preparation method for silver zinc oxide electrical contact

Examples

Experimental program
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Effect test

Embodiment 1

[0023] 1. The product of AgZnO (12) is prepared by atomized alloy powder AgZn, weighed according to the theoretically required 37.6g of AgZn, adopts compression molding, and the relative density of the initial compaction 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 releasing the pressure.

[0029] ...

Embodiment 2

[0031] 1. The product of AgZnO (12) is prepared by atomized alloy powder AgZn, weighed according to the theoretically required 37.6g of AgZn, adopts compression molding, and the relative density of the initial compaction is 75%;

[0032] 2. Put the compact into the hydrogen atmosphere and treat it at 500°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, and take out the product after releasing the p...

Embodiment 3

[0039] 1. The product of AgZnO (12) is prepared by atomized alloy powder AgZn, weighed according to the theoretically required 37.6g of AgZn, adopts compression molding, and the relative density of the initial compaction 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, control the temperature 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 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;

[0044] 6. Put the heated green body into the mold cavity for pressing, the unit pressing pressure is 14T, keep the pressure for 5-10 seconds, and take out the product after the pressure is released. The pro...

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Abstract

The invention discloses a preparation method for a silver zinc oxide electrical contact. The method comprises the following steps of: forming a pressed blank in a die pressing mode by adopting silver zinc alloy powder, wherein the relative density of the pressed blank is 65 to 80 percent; treating the formed pressed blank for 1 to 3 hours at the temperature of between 350 and 600 DEG C in hydrogen atmosphere, putting the treated pressed blank into an oxidation furnace with oxygen pressure of 0.02 to 1.5MPa and temperature of 500 to 750 DEG C, and performing oxidation; and for obtaining the high-compactness silver zinc oxide electrical contact, sintering the internal oxidized blank in the air at the temperature of between 700 and 900 DEG C, performing hot repressing on the blank at the temperature of between 500 and 900 DEG C, and thus obtaining an electrical contact product with relative density of over 99 percent. The silver zinc oxide granules prepared by the method are fine and uniform in metallographic structure; and the method has the advantages of an internal oxidation process and does not produce 'poor oxide bright bands'.

Description

technical field [0001] The invention relates to a preparation process of an electric contact material used for low-voltage electrical appliances, in particular to a preparation method of a silver-zinc oxide electric contact. 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: po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C32/00C22C1/04C22C5/06H01H1/0237
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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