Powder metallurgy silver cadmium oxide electrical contact material and manufacturing process of thereof

A kind of electric contact material, powder metallurgy technology, applied in the direction of contacts, circuits, electric switches, etc., can solve the problems of inability to meet the electrical on-off test, uneven local composition, long processing cycle, etc., achieve low bonding times, Good electrical conductivity and the effect of improving efficiency

Active Publication Date: 2021-05-25
宁波东大神乐电工合金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The silver cadmium oxide electrical contact material produced by this method has certain defects. (1) The larger the contact size, the longer the processing cycle required, and there is a poor oxidation area in the center of the material, resulting in uneven local composition; (2) ) The cadmium oxide particle size produced by the internal oxidation method of the alloy is generally 1-10 microns, and the oxide particles are too small to meet the electrical on-off test under the condition of heavy current and heavy load; (3) due to the melting point of silver (Ag) It is 960 degrees Celsius, and some special additives that are beneficial to improving electrical properties cannot be added during alloy melting

Method used

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  • Powder metallurgy silver cadmium oxide electrical contact material and manufacturing process of thereof
  • Powder metallurgy silver cadmium oxide electrical contact material and manufacturing process of thereof
  • Powder metallurgy silver cadmium oxide electrical contact material and manufacturing process of thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Its preparation method comprises the following steps:

[0042] (1) The proportion of ingredients is, silver (Ag): 80%, cadmium oxide (CdO): 18.49%, silver tungstate (Ag2WO4): 0.8%, silver molybdate (Ag2MoO4): 0.2%, magnesium oxide (MgO): 0.01%, beryllium oxide (BeO): 0.5%;

[0043] (2) first calcining the cadmium oxide powder in air for 1 hour at a temperature of 750 degrees Celsius; after the calcination is completed, the cadmium oxide powder is ball milled for 0.5 hour; after the ball milling is completed, it is mixed with the silver powder for 1 hour;

[0044] (3) add described silver tungstate powder in the powder after mixing in step (2), described silver molybdate powder, described magnesium oxide powder, described beryllium oxide powder, continue ball milling 10 hours after adding; After the ball milling is completed, the obtained powder is calcined in the air for 1 hour, and the calcining temperature is 700 degrees Celsius;

[0045] (4) Granulation: put the ab...

Embodiment 2

[0051] Its preparation method comprises the following steps:

[0052] (1) The proportion of ingredients is, silver (Ag): 85%, cadmium oxide (CdO): 13.49%, silver tungstate (Ag2WO4): 0.6%, silver molybdate (Ag2MoO4): 0.4%, magnesium oxide (MgO): 0.01%, beryllium oxide (BeO): 0.5%;

[0053] (2) first calcining the cadmium oxide powder in air for 1 hour, the calcining temperature is 750 degrees Celsius; after the calcination is completed, the cadmium oxide powder is ball milled for 0.5 hour; after the ball milling, it is mixed with the silver powder for 2 hours;

[0054] (3) add described silver tungstate powder in the powder after mixing in step (2), described silver molybdate powder, described magnesium oxide powder, described beryllium oxide powder, continue ball milling 10 hours after adding; After the ball milling is completed, the obtained powder is calcined in the air for 1 hour, and the calcining temperature is 700 degrees Celsius;

[0055] (4) Granulation: put the abov...

Embodiment 3

[0061] Its preparation method comprises the following steps:

[0062] (1) The proportion of ingredients is, silver (Ag): 75%, cadmium oxide (CdO): 22.5%, silver tungstate (Ag2WO4): 1.45%, silver molybdate (Ag2MoO4): 0.5%, magnesium oxide (MgO): 0.05%, beryllium oxide (BeO): 0.5%;

[0063] (2) First calcining the cadmium oxide powder in air for 1 hour, the calcination temperature is 800 degrees Celsius; after the calcination is completed, the cadmium oxide powder is ball milled for 1 hour; after the ball milling is completed, it is mixed with the silver powder for 2 hours;

[0064] (3) add described silver tungstate powder in the powder after mixing in step (2), described silver molybdate powder, described magnesium oxide powder, described beryllium oxide powder, continue ball milling 12 hours after adding; After the ball milling is completed, the obtained powder is calcined in the air for 1 hour, and the calcining temperature is 700 degrees Celsius;

[0065] (4) Granulation:...

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Abstract

The invention relates to the technical field of manufacturing of electrical contact materials, in particular to a powder metallurgy silver cadmium oxide electrical contact material and a manufacturing process thereof. The powder metallurgy silver cadmium oxide electrical contact material comprises the following components in percentage by mass: 85-75% of silver (Ag), 15-23% of cadmium oxide (CdO), 0.5-2% of silver tungstate (Ag2WO4), 0.5-2% of silver molybdate (Ag2MoO4), 0.01-0.05% of magnesium oxide (MgO) and 0.05-0.5% of beryllium oxide (BeO); and silver powder and cadmium oxide powder are mechanically mixed, silver tungstate powder, silver molybdate powder, magnesium oxide powder and beryllium oxide powder are added, and then ball-milling, calcining, granulating, pressing, sintering and re-pressing are carried out to prepare the silver cadmium oxide electrical contact material. Oxide particles of the prepared silver cadmium oxide electrical contact material can be suitable for being used in large-current and heavy-load occasions, and meet electrical appliance on-off tests under the large-current and heavy-load conditions, and under repeated connection, the number of bonding times is small and the electrical conductivity is better; and the problem that an internal oxidation silver cadmium oxide electrical contact material is poor in electrical performance under the large-current and heavy-load conditions is solved.

Description

technical field [0001] The invention relates to the technical field of manufacturing electric contact materials, in particular to a powder metallurgy silver cadmium oxide electric contact material and a manufacturing process thereof. Background technique [0002] At present, the production methods of silver cadmium oxide electrical contact materials are all made by the internal oxidation method. This method is to melt silver, cadmium and other metal blocks into an alloy melt in an intermediate frequency melting furnace to melt silver and cadmium series alloys. Afterwards, it is sintered at high temperature in an oxygen-containing atmosphere, that is, under a certain temperature, oxygen pressure, and oxidation time, the cadmium atoms and oxygen atoms in the silver-cadmium alloy are selectively oxidized to form a silver-cadmium oxide material. [0003] The silver cadmium oxide electrical contact material produced by this method has certain defects. (1) The larger the contact s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C5/06C22C32/00C22C1/05B22F1/00B22F3/03B22F3/16H01H1/0237H01H11/04
CPCB22F1/0003C22C5/06C22C32/001C22C1/05B22F3/03B22F3/16H01H1/02374H01H11/048
Inventor 李石华戚双祥
Owner 宁波东大神乐电工合金有限公司
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