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Silver zinc oxide electric contact material and preparation method thereof

A technology of silver zinc oxide and electric contacts, which is applied in the directions of contacts, circuits, electric switches, etc., can solve the problems that it is difficult to meet the requirements of high current use, the service life of materials is short, and the requirements for oxidation equipment are high, so as to achieve scientific formula ratio Reasonable, low production cost, good processing performance

Inactive Publication Date: 2011-01-12
YANGZHOU LEYIN ALLOY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The metallographic structure of the product manufactured by the internal oxidation process is uneven, and there is a zinc-poor area, resulting in a short service life of the material and high requirements for oxidation equipment
The metallographic structure of the products manufactured by the powder metallurgy process is uneven, the density is low, and it is difficult to meet the requirements of high current use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) After silver, zinc, nickel, copper and tin are added into the smelting furnace by weight percentage to smelt the ingot, they are sintered and extruded into strips, and then drawn into silver-zinc alloy wires; the weight percentages of the silver and zinc are respectively It is: silver 90-95%, zinc 5-10%, nickel, copper and tin are respectively 0.15-0.25%, 0.05-0.45%, 0.05-0.3% of the total weight of silver and zinc, and the melting and casting temperature is 1050-1200 ° C; the sintering temperature of the sintered extruded strips is 720-850 ° C, and the heat preservation is 1-4 hours, and the extrusion ratio is 1:150-300.

[0015] (2) The silver-zinc alloy wire is oxidized at high temperature and high pressure to form a silver-zinc oxide wire, the oxygen pressure of the oxidation is 0.3-0.6Mpa, the oxidation temperature is 600-750°C, and the oxidation time is 10-30 hours.

[0016] (3) The silver-zinc oxide wire rod is processed by an open tilting press and cut into ...

Embodiment 2

[0021] (1) After silver, zinc, nickel, copper and tin are added into the smelting furnace by weight percentage to smelt the ingot, they are sintered and extruded into strips, and then drawn into silver-zinc alloy wires; the weight percentages of the silver and zinc are respectively It is: silver 95%, zinc 5%, nickel, copper and tin are respectively 0.25%, 0.45% and 0.05% of the total weight of silver and zinc, and the melting and casting temperature is 1050°C; the sintering temperature of the sintering extruded strips 720°C, and keep it warm for 1 hour, and the extrusion ratio is 1:150.

[0022] (2) The silver-zinc alloy wire is oxidized at high temperature and high pressure to form a silver-zinc oxide wire, the oxygen pressure of the oxidation is 0.3Mpa, the oxidation temperature is 600°C, and the oxidation time is 30 hours.

[0023] (3) The silver-zinc oxide wire is processed by an open tilting press and cut into pieces of 5 mm, and the pieces are pressed in a steel mold to ...

Embodiment 3

[0028] (1) After silver, zinc, nickel, copper and tin are added into the smelting furnace by weight percentage to smelt the ingot, they are sintered and extruded into strips, and then drawn into silver-zinc alloy wires; the weight percentages of the silver and zinc are respectively It is: 90% silver, 10% zinc, nickel, copper and tin are respectively 0.15%, 0.05% and 0.3% of the total weight of silver and zinc, and the melting and casting temperature is 1200°C; the sintering temperature of the sintered extruded bars at 850°C, and kept warm for 4 hours, and the extrusion ratio was 1:300.

[0029] (2) The silver-zinc alloy wire is oxidized at high temperature and high pressure to form a silver-zinc oxide wire, the oxygen pressure of the oxidation is 0.6Mpa, the oxidation temperature is 750°C, and the oxidation time is 10 hours.

[0030] (3) The silver-zinc oxide wire is processed by an open tilting press and cut into pieces of 20 mm, and the pieces are pressed in a steel mold to ...

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Abstract

The invention discloses a silver zinc oxide electric contact material and a preparation method thereof, and belongs to the technical field of electrical materials. The method comprises the following steps of: melting and ingoting silver, zinc and additives in a smelter according to a certain weight ratio, sintering and extruding into strips, and drawing to form a silver-zinc alloy wire material; oxidizing the silver-zinc alloy wire material to obtain a silver zinc oxide wire material; cutting the wire material into pieces by an open-back inclinable press, pressing the cut pieces in a steel die to manufacture an extruded stock, and sintering and extruding the cut pieces to manufacture a plate or a wire material; polishing the surface of the extruded plate, performing hot rolling on silver, rolling, punching and molding; and drawing, annealing and drawing the extruded wire material to a finished product wire material with phi of between 0.5 and 3.0mm to produce the rivet electric contact. In the method, the silver-zinc wire material is used for oxidation, so the alloy is easily oxidized without special oxidizing equipment; the metallographic phase of the material has uniform tissue without an oxidation zinc lean region or oxidation aggregation, and the consistency of the material performance, high compactness and good processing performance can be ensured; the method can realize mass production and has low production cost; and the production process and the material per se have no pollution to the environment.

Description

technical field [0001] The invention relates to a novel silver-zinc oxide electrical contact material and a preparation method thereof, belonging to the technical field of electrical materials. Background technique [0002] At present, the electrical contact materials used in various relays, contactors and other electrical switches in China are mainly silver cadmium oxide. Although silver cadmium oxide electrical contact materials have better material properties and lower material costs, especially high cadmium oxide Even more so, the production process is stable and mature, but the electrical contact products contain cadmium oxide, and cadmium salts will remain in the environment in the future. Because metal cadmium and cadmium salts have great toxic and side effects on the human body and serious environmental pollution, it will Gradually restrict the use of silver cadmium oxide electrical contact materials. The silver zinc oxide electrical contact material is a new type o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H1/0237H01H11/04C22C5/06C22C1/04C22F1/14
CPCY02P70/50
Inventor 谢平云陈建新陆汉琼张正权
Owner YANGZHOU LEYIN ALLOY TECH
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