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Silver/nickel/metallic oxide electrical contact material preparation method

A contact material, oxide electricity technology, applied in contacts, circuits, electrical switches, etc., can solve the problems of limited contribution of conductivity and elongation, to eliminate poor interface wetting properties, improve interface wetting properties, and improve process performance Effect

Active Publication Date: 2012-12-05
WENZHOU HONGFENG ELECTRICAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The silver in this local area only plays the role of strengthening the phase carrier, and the noble metal silver in it has a relatively limited contribution to the conductivity and elongation of the overall material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. adopt the method for electroless plating to coat one deck nickel to CdO powder, make the average content (percentage by weight) of CdO in the powder be 80%, the average percentage by weight content of nickel is 20%; Can adopt the following in the present embodiment Process realization:

[0027] a) Dispersion before plating: the dispersion effect of nanoparticles is directly related to the distribution and content of the particles in the composite coating, and then directly affects the performance of the composite coating. Preferably, sodium alginate (or polyvinylpyrrolidone) is used as the dispersant in this embodiment. Specifically, first wet 12.5g of CdO nanoparticles with 200mL of absolute ethanol; then weigh 7.5g of sodium alginate and dissolve it in 1L of deionized water; then slowly wetting the CdO nanoparticles with absolute ethanol Add it to sodium alginate solution, ultrasonically disperse and mechanically stir to obtain a dispersion;

[0028] b) Sensitiza...

Embodiment 2

[0040] 1. On SnO 2 A layer of nickel is coated by electroless plating, so that the SnO in the powder 2 The average weight percentage content of nickel is 60%, and the average weight percentage content of nickel is 40%;

[0041] 2. For nickel-coated SnO 2 A layer of silver is further coated with electroless plating, and the average weight percentage of silver in the coated powder is less than 10%; in this embodiment, the following existing technologies can be used to achieve:

[0042] Put the Ni-CdO powder into the reducing solution and mechanically stir and disperse for 5 minutes, add the silver ammonia solution drop by drop into the reducing solution with a dropper and mechanically stir, so that the silver ions are reduced and deposited on the surface of Ni-CdO, and deionized water Clean and dry at 50°C to obtain Ag / Ni / CdO powder with core-shell structure;

[0043] In this embodiment, the silver ammonia solution and reducing solution are prepared respectively according to ...

Embodiment 3

[0052] 1. The ZnO is coated with a layer of nickel by electroless plating, so that the average weight percentage of ZnO in the powder is 40%, and the average weight percentage of nickel is 60%;

[0053] 2. The nickel-coated ZnO is further coated with a layer of silver by electroless plating, and the average weight percentage of silver in the coated powder is less than 10%;

[0054] 3. Put the prepared Ag / Ni / ZnO core-shell powder into a nitrogen sintering furnace for sintering and granulation. The sintering temperature is 700°C. After granulation, sieve to remove fine particles, and keep the particle size -100 mesh to +400 The intermediate composite particle powder between the meshes;

[0055] 4. Mix the Ag / Ni / ZnO intermediate composite particle powder obtained by sieving with pure silver powder, so that the average weight percentage content of ZnO in the mixed powder is 10%, and then pour the powder into the "V" type mixing In the powder machine, mix the powder evenly, the sp...

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Abstract

The invention discloses a silver / nickel / metallic oxide electrical contact material preparation method including the steps: cladding a metallic nickel layer on metallic oxide particles by means of chemical plating; cladding a silver layer on nickel-clad metallic oxides by means of chemical plating; sintering and granulating clad powder of an Ag-Ni-MeO core-shell structure under the protection of nitrogen to obtain intermediate composite particle powder bodies prior to screening; mixing intermediate composite particles with pure silver powder, and lowering the content of the metallic oxides to a set numerical value; and after the processes of powder pressing, protective atmosphere sintering, extrusion and drawing, obtaining novel silver / nickel / metallic oxide materials in funicular distribution in a local area of metallic oxide particles in silver / nickel / metallic oxide materials, and the local area mainly includes metallic nickel and a small quantity of metallic silver except for metallic oxide reinforced-phase particles.

Description

technical field [0001] The invention relates to an electrical contact material, in particular to a preparation method of a silver / nickel / metal oxide electrical contact material. Background technique [0002] Silver-based electrical contacts are the core components of electrical switches, which are responsible for the connection and disconnection of circuits, and are widely used in various low-voltage electrical appliances such as air switches, relays, and AC and DC contactors. In recent years, with the continuous improvement of industrial application level and cost performance requirements, new preparation processes and silver-based electrical contact composite materials have been introduced. [0003] After searching the existing technology, it was found that the authorized invention patent announced in 2011 (201010579827.4, preparation method of silver-based electrical contact material reinforced with directional arrangement of particles) discloses an electroless plating co...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C5/06H01H1/0237
Inventor 陈乐生陈宇航
Owner WENZHOU HONGFENG ELECTRICAL ALLOY
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