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Preparation method for silver/nickel/graphite electric contact material

An electrical contact material, graphite technology, applied in the directions of contacts, circuits, electrical switches, etc., can solve the problems of limited contribution of conductivity and elongation, and achieve the effect of improving process performance, eliminating adverse effects, and improving interface wetting characteristics.

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

[0025] 1. Colloidal graphite is coated with a layer of nickel by means of electroless plating, so that the average content (percentage by weight) of colloidal graphite in the powder is 5%, and the average weight percent content of nickel is 95%; Can adopt the following in the present embodiment Existing technology implementation:

[0026] a) At first, carry out surface modification to colloidal graphite powder with concentrated nitric acid, concrete process is: 5g colloidal graphite powder is put into 20ml concentrated nitric acid (40%), keep temperature is 80 ℃, reflux 3h, filter, wash with water, Dry and set aside.

[0027] b) Sensitization treatment: the colloidal graphite powder after the surface modification is in the SnCl that concentration is 2g / L 2 2H 2 O SnCl 2 2H 2 Sensitization treatment in O solution for 10 minutes.

[0028] c) Add the sensitized colloidal graphite powder to 0.1g / L of PdCl 2 solution, stirred for 10 min, filtered, washed and set aside.

[00...

Embodiment 2

[0038]1. Colloidal graphite is coated with a layer of nickel by electroless plating, so that the average weight percentage of colloidal graphite in the powder is 10%, and the average weight percentage of nickel is 90%;

[0039] 2. The colloidal graphite coated with nickel is further coated with a layer of silver by electroless plating, and the average weight percentage content of silver in the powder after coating is less than 10%; in the present embodiment, the following prior art can be adopted to realize:

[0040] Put the Ni-C 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-C, and deionized water Clean and dry at 50°C to obtain Ag-Ni-C powder with a core-shell structure.

[0041] In this embodiment, the silver ammonia solution and reducing solution are prepared...

Embodiment 3

[0050] 1. The colloidal graphite is coated with a layer of nickel by electroless plating, so that the average weight percentage content of the colloidal graphite in the powder is 30%, and the average weight percentage content of nickel is 70%;

[0051] 2. The colloidal graphite coated with nickel 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%;

[0052] 3. Put the prepared Ag-Ni-C core-shell structure powder into a nitrogen-protected 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~+ Intermediate composite particle powder between 400 mesh;

[0053] 4. Mix the Ag-Ni-C intermediate composite particle powder obtained by sieving with pure silver powder, so that the average weight percentage of colloidal graphite in the mixed powder is 5%, and then pour the powde...

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Abstract

The invention discloses a preparation method for a silver / nickel / graphite electric contact material. The preparation method comprises the steps as follows: 1, coating colloidal graphite with a layer of metal nickel by chemical plating; 2, further coating the colloidal graphite powder coated with the nickel by chemical plating with a layer of silver; 3, sintering and granulating a powder body with an Ag-Ni-C nuclear shell structure formed after coating by nitrogen protection to obtain an intermediate compound granule powder body; 4, sieving the obtained intermediate compound granule powder body; and 5, mixing the intermediate compound granule with pure silver powder, and reducing the content of the colloidal graphite to be the set value; and carrying out the conventional process of mixing the powder, pressing the powder body, sintering in nitrogen protection atmosphere, extruding and drawing to obtain the novel silver / nickel / graphite material with colloidal graphite granules distributed in a fiber shape in a local region, wherein the local region mainly comprises the metal nickel and a small amount of metal silver in addition to a colloidal graphite reinforced phase.

Description

technical field [0001] The invention relates to an electrical contact material, in particular to a preparation method of a silver / nickel / graphite 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 coati...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C5/06H01H1/023
Inventor 陈乐生陈宇航
Owner WENZHOU HONGFENG ELECTRICAL ALLOY
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