Preparation method of atomized silver and zinc oxide electrical contact materials containing additives

An electric contact material, silver zinc oxide technology, applied in contacts, circuits, electric switches, etc., can solve the problem of not being able to add high-melting point additives, achieve low cost, improve additive segregation, and shorten the processing cycle.

Inactive Publication Date: 2014-04-09
GUILIN ELECTRICAL EQUIP SCI RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the silver-zinc alloy powder obtained by atomization is added to an aqueous solution or an ethanol solution containing salt compounds of added elements, and pre-oxidized after wet mixing and drying. During the pre-oxidation treatment, salts containing added elements The compound is decomposed into corresponding metal oxides, and the metal oxides obtained from the decomposition are evenly attached to the surface of silver zinc oxide particles, which improves the problems that the traditional atomization process cannot add high melting point additives and additive segregation

Method used

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  • Preparation method of atomized silver and zinc oxide electrical contact materials containing additives
  • Preparation method of atomized silver and zinc oxide electrical contact materials containing additives
  • Preparation method of atomized silver and zinc oxide electrical contact materials containing additives

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) According to the preparation of 10kg of Ag-8ZnO-5Er 2 o 3 Material proportioning calculates the consumption of each raw material, takes by weighing 10kg of pure silver block, 0.736kg of pure zinc block, 1.16kg of erbium nitrate, and sets aside;

[0027] 2) Take pure silver and pure zinc ingots and place them in an intermediate frequency melting furnace to melt into a uniform alloy melt, atomize them through high-pressure water atomization equipment, dry the obtained powder slurry, and pass through a 100-mesh sieve to obtain silver alloys. Zinc alloy powder;

[0028] 3) Take erbium nitrate and dissolve it with 3L of absolute ethanol to form an ethanol solution of erbium nitrate, add 9.34kg of silver-zinc alloy powder, and mix the obtained slurry with a low-speed mixer (the time is 2h, and the number of revolutions is 30r / min) , obtaining the silver-zinc alloy powder slurry with uniform distribution of erbium nitrate;

[0029] 4) Dry the silver-zinc alloy powder slu...

Embodiment 2

[0033] 1) According to the preparation of 10kg of Ag-10ZnO-1.5CuO-1Mo 2 o 3 -0.5La 2 o 3 Material ratio calculation of the amount of each raw material, weighing 10kg pure silver block, 0.92kg pure zinc block, copper nitrate 0.454kg, ammonium molybdate 0.136kg, lanthanum nitrate 0.133kg, spare;

[0034] 2) Put the pure silver block and pure zinc block in the intermediate frequency smelting furnace to melt into a uniform alloy melt, atomize it through high-pressure water atomization equipment, dry the obtained powder slurry, and pass through a 100-mesh sieve to obtain silver Zinc alloy powder;

[0035]3) get copper nitrate, lanthanum nitrate, ammonium molybdate and dissolve with 2L of water, be made into the aqueous solution of copper nitrate, ammonium molybdate and lanthanum nitrate, add 9.5kg silver-zinc alloy powder, the gained slurry carries out mixing process with low-speed mixer ( The time is 2h, and the number of revolutions is 30r / min), obtains the silver-zinc alloy ...

Embodiment 3

[0040] 1) According to the preparation of 10kg of Ag-12ZnO-2WO 3 -0.5Li 2 o 3 Material ratio Calculate the amount of each raw material, weigh 10kg of pure silver block, 1.12kg of pure zinc block, 0.209kg of ammonium metatungstate, 0.23kg of lithium nitrate, and set aside;

[0041] 2) Take pure silver and pure zinc ingots and place them in an intermediate frequency melting furnace to melt into a uniform alloy melt, atomize them through high-pressure water atomization equipment, dry the obtained powder slurry, and pass through a 200-mesh sieve to obtain silver alloys. Zinc alloy powder;

[0042] 3) Dissolve ammonium metatungstate and lithium nitrate in 3L of water to form an aqueous solution of ammonium metatungstate and lithium nitrate, add 9.51kg of silver-zinc alloy powder, and mix the obtained slurry with a low-speed mixer (1h, Number of revolutions is 30r / min), obtains the silver-zinc alloy powder slurry that ammonium metatungstate and lithium nitrate are evenly distribu...

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Abstract

The invention discloses a manufacturing method of atomized silver and zinc oxide electrical contact materials containing additives. The method comprises the following steps that (1), according to the material ratio of silver and zinc oxide electrical contacts needing preparing, the dosages of needed pure silver blocks, needed pure zinc blocks and needed salt-class compounds containing the additives are calculated, and the needed pure silver blocks, and the needed pure zinc blocks and the needed salt-class compounds containing the additives are weighed for the standby; (2), the pure silver blocks and the pure zinc blocks are atomized to be silver and zinc alloy powder; (3), the salt-class compounds containing the additives are prepared to form a water solution or an ethyl alcohol solution, the silver and zinc alloy power is added into the solution to be mixed, and silver and zinc alloy powder slurry with the salt-class compounds containing the additives evenly distributed is obtained; (4), the slurry is dried and smashed, and silver and zinc alloy powder with the salt-class compounds containing the additives evenly distributed is obtained; (5), pre-oxidation processing, isostatic pressing formation, sintering and extrusion are carried out on the alloy powder so as to obtain the atomized silver and zinc oxide electrical contact materials containing the additives. The method well solves the problem of segregation of the additives caused by a traditional atomization and power mixing process, and improves the degree of densification, the processing performance, the material yield and the electrical property of the materials.

Description

technical field [0001] The invention relates to the field of metal-based composite materials, in particular to a method for preparing an additive-containing atomized silver-zinc oxide electric contact material. Background technique [0002] As a contact material, silver cadmium oxide (AgCdO) has good comprehensive properties and a wide range of applications, and has been used for decades. However, Cd vapor is toxic and pollutes the environment. In recent years, many countries have carried out research on the generation of Cd materials. Silver zinc oxide (AgZnO) is a new type of non-toxic electrical contact material that has developed rapidly in recent years. The thermal stability of the AgZnO contact material is higher than that of CdO, and the melting point is 1795 ° C. Therefore, AgZnO has excellent resistance to welding, good Arc corrosion resistance, low and stable contact resistance, easy welding and so on. At the same time, the electrical properties of the AgZnO con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16H01H1/0237B22F9/08
Inventor 王振宇黄锡文叶凡张天锦肖光刘晗
Owner GUILIN ELECTRICAL EQUIP SCI RES INST
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