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A silver-ZnO electric contact and its making method

A zinc oxide and electric contact technology, applied in contacts, circuits, electric switches, etc., can solve problems such as ZnO particle agglomeration, and achieve the effects of sufficient zinc oxidation, stable contact resistance, and high electrical performance

Inactive Publication Date: 2008-08-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a solution to the problem that ZnO particles agglomerate on the surface of the alloy powder during the internal oxidation process of the Ag-Zn alloy powder, so that there is a good bonding interface between the dispersed ZnO and the Ag matrix, and the formability of the material is improved. and follow-up processability, improving the anti-welding and arc erosion resistance of materials, silver-zinc oxide electric contact and preparation method thereof

Method used

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  • A silver-ZnO electric contact and its making method
  • A silver-ZnO electric contact and its making method
  • A silver-ZnO electric contact and its making method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: Get 2 kilograms of silver, 252 grams of zinc, put in medium-frequency induction furnace and smelt into liquid state, carry out alloy atomization with high-pressure gas atomization equipment, the solid particle-containing liquid after atomization is dried into alloy powder, After screening, put the powder with a particle size of 100-325 mesh into a ball mill for ball milling, the ball milling time is 25 hours, the ball-to-material ratio is 5:1, and the ball milling medium is alcohol. After ball milling, put the powder into an oxidation furnace for oxidation. The oxidation temperature is controlled at 500°C, and an oxygen pressure of 20 atm is maintained. Take it out after oxidation for 4 hours, and add 125 grams of MoO after the inspection meets the requirements. 3 , La 2 o 3 , and Bi 2 o 3 Mix evenly, put the mixed powder into a ball mill for mechanical alloying, then conventional molding, sintering at 700°C for 5 hours, take out and hot forge to obtain...

Embodiment 2

[0041]Embodiment 2: Get 2 kilograms of silver, 237 grams of zinc, place in the intermediate frequency induction furnace and melt into liquid state, carry out alloy atomization with high-pressure gas atomization equipment, the solid particle-containing liquid after atomization is dried into alloy powder, After screening, put the powder with a particle size of 100-325 mesh into a ball mill for ball milling, the ball milling time is 100 hours, the ball-to-material ratio is 10:1, and the ball milling medium is alcohol. After ball milling, put the powder into an oxidation furnace for oxidation. The oxidation temperature is controlled at 700°C, and the oxygen pressure is maintained at 50 atm. Take it out after oxidation for 1.5 hours, and add 5.9 grams of WO 3 Mix evenly, put the mixed powder into a ball mill for mechanical alloying, and then shape it, sinter it at 860°C for 3 hours, take it out and extrude it into wire, and then draw it to get the finished product.

Embodiment 3

[0042] Embodiment 3: take 2 kilograms of silver, 119 grams of zinc, place in the intermediate frequency induction furnace and melt into liquid state, carry out alloy atomization with high-pressure gas atomization equipment, the solid particle-containing liquid after atomization is dried into alloy powder, After screening, put the powder with a particle size of 100-325 mesh into a ball mill for ball milling, the ball milling time is 50 hours, the ball-to-material ratio is 5:1, and the ball milling medium is alcohol. After ball milling, put the powder into an oxidation furnace for oxidation. The oxidation temperature is controlled at 600°C, and the oxygen pressure of 30atm is maintained. After oxidation, take it out for 2.5 hours, and add 44 grams of ZrO after the inspection meets the requirements. 2 Mix it with TaC evenly, put the mixed powder into a ball mill for mechanical alloying, and then shape it, sinter it at 800°C for 4 hours, take it out and extrude it into wire, and th...

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Abstract

The present invention provides a silver-zinc oxide electrical contact and the preparing method thereof. The electric contact related by the invention is composed of silver, zinc oxide and additive. The preparing method comprises the following procedures: preparing Ag and Zn in proportion, preparing Ag-Zn alloy powder with gas atomizing after melting, oxidizing the alloy powder after abrasive processing, adding additive, and preparing the thread material or sheet material after the techniques of molding, sintering and hot processing. The silver-zinc oxide prepared with the invention has the advantages of sufficient zinc oxidizing, high oxidation efficiency, dispersed arrangement of zinc oxide at the inner part of the power particle, uniform formation, excellent combination property, excellent fusion welding resistance, excellent electrical arc corrosion resistance, low and stable contact resistance, easy soldering, and no danger to the human body and environment. The invention is suitable for industrial production and can replace the poisonous silver-cadmium oxide contact.

Description

technical field [0001] The invention relates to the field of silver-metal oxide (Ag-MeO) electrical contact materials, in particular to a silver-zinc oxide electrical contact and a preparation method thereof. technical background [0002] In recent years, silver-metal oxide (Ag-MeO) contact materials have been more and more widely used, among which Ag-CdO has good performance, and the applied voltage is from a few volts to thousands of volts in various low-voltage electrical appliances Among them, it was once called universal contact. However, the "cadmium poisoning" pollution produced during the manufacture and use of Ag-CdO materials has attracted great attention from governments around the world. Since June 1, 2006, the EU market has begun to ban Ag-CdO contact materials. As an alternative material of Ag-CdO, silver-zinc oxide (Ag-ZnO) has the characteristics of excellent welding resistance, good arc corrosion resistance, low and stable contact resistance, easy welding ...

Claims

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Application Information

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IPC IPC(8): H01H1/0237H01H11/04C22C5/06C22C1/04C22C1/05
Inventor 易丹青吴春萍李荐王斌许灿辉
Owner CENT SOUTH UNIV
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