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 si

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1:

[0025] 1. The method of electroless plating is used to coat a layer of nickel on colloidal graphite, so that the average content (weight percent) of colloidal graphite in the powder is 5%, and the average weight percent content of nickel is 95%; the following can be used in this embodiment. The existing technology realizes:

[0026] a) First, use concentrated nitric acid to modify the surface of colloidal graphite powder. The specific process is: put 5g of colloidal graphite powder into 20ml of concentrated nitric acid (40%), keep the temperature at 80°C, reflux for 3h, filter, wash with water, Dry and reserve.

[0027] b) Sensitization treatment: the surface-modified colloidal graphite powder was treated with SnCl with a concentration of 2g / L 2 ·2H 2 O SnCl 2 ·2H 2 Sensitized in O solution for 10 min.

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

[00...

Example Embodiment

[0037] Example 2:

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

[0039] 2. The colloidal graphite coated with nickel is further coated with a layer of silver by chemical 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 used to achieve:

[0040] Put the Ni-C powder into the reducing solution and mechanically stir and disperse it for 5 minutes. Add the silver ammonia solution dropwise to the reducing solution with a dropper and stir it mechanically to reduce and deposit silver ions on the surface of Ni-C. After cleaning and drying at 50°C, Ag-Ni-C powder with a core-shell structure was obtained.

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

Example Embodiment

[0049] Example 3:

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

[0051] 2. The nickel-coated colloidal graphite is further coated with a layer of silver by chemical plating, and the average weight percentage of silver in the powder after coating 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. Intermediate composite particle powder between 400 meshes;

[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 powder into the "V" type In the mixing machine, uniformly mix powder, the speed of mixing i...

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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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