Preparation method for silver cadmium oxide electrical contact

A technology of silver cadmium oxide and electrical contacts, which is applied in the direction of circuits, electrical switches, electrical components, etc., and can solve the problem of low density of powder metallurgy process

Active Publication Date: 2012-01-18
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 cadmium 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 cadmium oxide electrical contact
  • Preparation method for silver cadmium oxide electrical contact

Examples

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Embodiment 1

[0024] 1. The product of AgCdO (12) is prepared by atomized alloy powder AgCd, weighed according to the theoretically required 39.7g of AgCd, and molded, and the relative density of the initial compaction is 65%;

[0025] 2. Put the compact into the hydrogen atmosphere and treat it at 550°C for 2 hours, and take it out after cooling;

[0026] 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;

[0027] 4. Heat the oxidized green body at 880°C for 4 hours in air for sintering;

[0028] 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;

[0029] 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.

[003...

Embodiment 2

[0032] 1. The product of AgCdO (12) is prepared by atomized alloy powder AgCd, weighed according to the theoretically required 39.7g of AgCd, and molded, and the relative density of the initial compaction is 75%;

[0033] 2. Put the green compact in a hydrogen atmosphere at 450°C for 2 hours, and take it out after cooling;

[0034] 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;

[0035] 4. Heat the oxidized green body at 880°C for 4 hours in air for sintering;

[0036] 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;

[0037] 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. see figure 1 , it can be...

Embodiment 3

[0040] 1. The product of AgCdO (12) is prepared by atomized alloy powder AgCd, weighed according to the theoretically required 39.7g of AgCd, and molded, and the relative density of the initial compaction is 85%;

[0041] 2. Put the green compact in a hydrogen atmosphere at 600°C for 2 hours, and take it out after cooling;

[0042] 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;

[0043] 4. Heat the oxidized green body at 880°C for 4 hours in the air for sintering;

[0044] 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;

[0045] 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.

[0046] The material...

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Abstract

The invention discloses a preparation method for a silver cadmium oxide electrical contact. The method comprises the following steps of: forming a pressed blank in a die pressing mode by adopting silver cadmium 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 under the hydrogen atmosphere at the temperature of between 350 and 600 DEG C, 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; for obtaining the silver cadmium oxide electrical contact with high compactness, sintering the internal oxidized blank at the temperature of between 700 and 900 DEG C in the air; and performing hot re-pressing 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 cadmium oxide particles 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 a 'depleted oxide bright band'.

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 cadmium 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: ...

Claims

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Application Information

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Patent Type & Authority Applications(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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