Functional coating of pure silver layer/pure-graphite composite layer and preparation method of functional coating

A silver-graphite, functional technology, applied in the field of electrical contact protection materials, can solve problems such as failure, decreased conductivity of pure silver coating, and difficulty in uniform dispersion, and achieves high efficiency in production process, excellent comprehensive performance, and great application value. Effect

Inactive Publication Date: 2016-02-03
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the graphite composite silver coating can improve the wear resistance, oxidation resistance, corrosion resistance, and welding resistance of the silver coating, the conductivity of graphite is worse than that of pure silver, which makes the overall conductivity of the pure silver coating decrease. In this case, it is easy to cause heat failure, and at the same time, during the preparation of the composite coating, graphite is prone to agglomeration in the solution, which is difficult to disperse evenly, and it is easy to cause poor uniformity of the coating and cause failure.

Method used

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  • Functional coating of pure silver layer/pure-graphite composite layer and preparation method of functional coating
  • Functional coating of pure silver layer/pure-graphite composite layer and preparation method of functional coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Configuration of electroplating solution:

[0022] The main components of the pre-silvering solution are: Ag + 0.5g / L, KCN60g / L, K 2 CO 3 12g / L, pH 10; the main components of the silver plating solution are: Ag + 20g / L, KCN40g / L, K 2 CO 3 20g / L, pH 10; the main components of the silver-graphite composite plating solution are: Ag + 20g / L, KCN20g / L, K 2 CO 3 20g / L, dispersant 15ml / L, auxiliary agent 15ml / L, graphite powder 50g / L, pH value 10.

[0023] (2) Electroplating:

[0024] Surface treatment of base material: Put the base material polished by sandpaper into the degreasing solution. After power on, adopt the combined degreasing method of cathode first and then anode. The cathode degreasing time is 30s, the anode degreasing time is 10s, and repeat once Combined degreasing of the rear anode; the base material after degreasing is soaked in deionized water at 60°C and shaken up and down for 5s, and then the base material is soaked in deionized water at room ...

Embodiment 2

[0035] (1) Configuration of electroplating solution:

[0036] The main components of the pre-silvering solution are: Ag + 1g / L, KCN50g / L, K 2 CO 3 12g / L, pH value 11; the main component of the silver plating solution is: Ag + 25g / L, KCN60g / L, K 2 CO 3 25g / L, pH value 11; the main components of the silver-graphite composite plating solution are: Ag + 25g / L, KCN75g / L, K 2 CO 3 25g / L, dispersant 20ml / L, auxiliary agent 20ml / L, graphite powder 70g / L, pH value 11.

[0037] (2) Electroplating:

[0038]Surface treatment of base material: Put the base material polished by sandpaper into the degreasing solution. After power on, adopt the combined degreasing method of cathode first and then anode. The degreasing time of cathode is 40s, and the degreasing time of anode is 40s. Combined degreasing of the rear anode; the base material after degreasing is soaked in 70°C deionized water and shaken up and down for 15s, and then the base material is soaked in deionized water at room t...

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Abstract

The invention provides a functional coating of a pure silver layer/pure-graphite composite layer and a preparation method of the functional coating. The coating takes the pure silver layer as a basic electroplated coating and the silver-graphite composite layer as a surface covering electroplated coating. The preparation method comprises the steps of treating a base material, preparing a pre-plating silver solution, preparing a plating silver solution, preparing a silver-graphite composite plating solution, preparing a silver coating, activating the silver coating and electroplating the silver-graphite composite layer. The functional coating provided by the invention has the following technical effects: the prepared coating is excellent in electrical conductivity and has contact resistance of 18-20 micro-ohms (external torque of 5-20N.m); and the friction resistance is excellent, and the friction coefficient is 0.06-0.15 when the normal-temperature normal-pressure load is 260g. Moreover, the prepared coating has the characteristics of good thermal conductivity, corrosion resistance, sulfur resistance and relatively long mechanical life, so that the coating provided by the invention has good comprehensive performance, can satisfy outdoor working conditions of a high-pressure isolating switch, and has a great application value.

Description

technical field [0001] The invention relates to a functional coating of a pure silver layer / silver graphite composite layer, in particular to the functional design of the coating and a preparation method thereof, belonging to the technical field of electric contact protection materials. Background technique [0002] At present, the protection parts of the dynamic and static contacts of outdoor high-voltage disconnectors are mostly designed with ordinary silver plating and hard silver plating. This kind of electrical contact material can provide good electrical conductivity, thermal conductivity and low and stable contact resistance, but there is wear and tear. The disadvantages of large quantity, poor welding resistance and poor corrosion resistance eventually lead to the heating failure of the isolating switch. Graphite is a good self-lubricating material. The silver-graphite composite electrical contact material prepared by electroplating and powder metallurgy can greatly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/10
Inventor 叶志国刘磊何庆庆刘书潭薛金涛罗辞辞王超陈川马光韩钰
Owner NANCHANG HANGKONG UNIVERSITY
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