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Multielement rare earth silver electric contact as well as preparation method and application thereof

A technology of rare earth and silver electricity, which is applied in the direction of contacts, circuits, electric switches, etc., to improve mechanical strength and anti-welding performance, reduce material transfer, and improve electrical life.

Inactive Publication Date: 2013-01-09
NINGBO HANBO PRECIOUS METAL ALLOY
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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 of the single strengthening element silver alloy contact, to provide a new multi-element silver rare earth strengthened silver alloy material and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] The preparation method of the aforementioned multi-element rare earth silver electrical contact material includes preparing silver-bismuth, silver-lanthanum, silver-cerium, and silver-nickel master alloys; smelting pure silver and the obtained master alloys in air or vacuum state to obtain alloy ingots; The obtained alloy ingot is homogenized, and then the steps of surface processing, extrusion, wire drawing, and making a filamentary rivet product are carried out, wherein: the preparation of the intermediate alloy is to separate silver with bismuth, lanthanum and cerium metals in a certain mass ratio. Under a protective atmosphere, silver 90 bismuth 10, silver 90 lanthanum 10, silver 90 cerium 10 master alloy are smelted, and silver powder and nickel powder are mixed and sintered to prepare a silver 90 nickel 10 master alloy. The process of preparing the master alloy by smelting is carried out under the protection of argon atmosphere, wherein the silver 90 bismuth 10 mas...

Embodiment 1

[0026] 1) 90 parts of silver and 10 parts of bismuth, lanthanum, and cerium metals, respectively, were smelted into a master alloy of silver 90 bismuth 10, silver 90 lanthanum 10, silver 90 cerium 10, and 90 parts Silver powder and 10 parts of nickel powder are mixed and sintered to prepare a silver 90 nickel 10 master alloy.

[0027] 2) Put pure silver and the above-prepared intermediate alloy in a medium frequency induction melting furnace in a weight ratio of pure silver: silver-bismuth alloy: silver-lanthanum alloy: silver-cerium alloy: silver-nickel alloy = 99.6: 0.05: 0.1: 0.2: 0.05. Melt pure silver at 1060℃, then add silver bismuth, silver lanthanum, silver cerium, and silver nickel master alloy in sequence, stir to melt all of them, keep it for 5 minutes, and cast into a columnar alloy with a diameter of 90mm in a special mold ingot.

[0028] 3) Homogenize the cylindrical alloy ingot prepared above at 400°C for 3 hours, then perform surface processing, and extrude th...

Embodiment 2

[0030] 1) 90 parts of silver and 10 parts of bismuth, lanthanum, and cerium metals, respectively, were smelted into a master alloy of silver 90 bismuth 10, silver 90 lanthanum 10, silver 90 cerium 10, and 90 parts Silver powder and 10 parts of nickel powder are mixed and sintered to prepare a silver 90 nickel 10 master alloy.

[0031] 2) Put pure silver and the above-prepared intermediate alloy in a medium frequency induction melting furnace in a weight ratio of pure silver: silver-bismuth alloy: silver-lanthanum alloy: silver-cerium alloy: silver-nickel alloy = 99.73: 0.03: 0.07: 0.15: 0.05. Melt pure silver at 1160℃, then add silver bismuth, silver lanthanum, silver cerium, and silver nickel master alloy in sequence, stir to melt all of them, keep it for 10 minutes, and cast it into a columnar alloy with a diameter of 90mm in a special mold ingot.

[0032] 3) Homogenize the cylindrical alloy ingot prepared above at 500°C for 10 hours, then perform surface processing, and ex...

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Abstract

The invention discloses a multielement rare earth silver electric contact and a preparation method thereof. The multielement rare earth silver electric contact consists of the following components in percentage by weight: 96-99.6% of silver, 0.05-0.5% of bismuth, 0.1-1.0% of lanthanum, 0.2-2.0% of cerium and 0.05-0.5% of nickel. The preparation method for the multielement rare earth silver electric contact comprises the following steps of: 1) preparing silver-bismuth, silver-lanthanum, silver-cerium and silver-nickel intermediate alloy; 2) smelting the silver and the intermediate alloy into an alloy ingot under the air or vacuum state; and 3) carrying out homogenization treatment to the alloy ingot in the following steps of surface processing, extrusion, wiredrawing and preparing into a rivet. The multielement rare earth silver electric contact disclosed by the invention has the advantages of high electric-conduction and thermal conductivity, low and stable contact resistance, electric arc burning loss resistance and even burning loss, and can be widely applied to a relay, a small contactor and the like. The fusion welding resistance performance of the multielement rare earth silver electric contact is better than that of pure silver, fine grain cylinder and sliver-copper alloy, and material transfer is small especially under the direct-current condition.

Description

technical field [0001] The invention relates to the technical field of precious metal alloy materials and preparation, in particular to a multi-element rare earth silver electrical contact material and a preparation method and application thereof. Background technique [0002] Electrical contacts are the key components of electrical switches, instrumentation, etc. Pure silver, fine-grained silver, etc. are widely used in low-power relays and auxiliary contacts of contactors, which have the advantages of high electrical conductivity and low contact resistance, but The shortcomings of its poor resistance to arc burning, poor resistance to fusion welding, and large material transfer under DC conditions also shorten its electrical life and affect its range of use. Therefore, some alloying elements, especially rare earth elements, are selectively added to pure silver to further strengthen the silver matrix and improve its anti-welding performance. At the same time, the unique pro...

Claims

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Application Information

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IPC IPC(8): C22C5/06C22C1/03H01H1/023
Inventor 石建华刘承峰林文武张兵
Owner NINGBO HANBO PRECIOUS METAL ALLOY