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Electrical contact material and preparation method thereof

An electrical contact material and carbonaceous technology, applied in contacts, circuits, electric switches, etc., can solve the problem of poor bonding between the intermediate phase and metal powder, difficult control of the addition ratio of carbon materials, and poor performance stability of electrical contact materials. problem, to achieve the effect of improving arc erosion resistance, low cost, and controllable carbon content

Active Publication Date: 2017-05-17
SCHNEIDER ELECTRIC IND SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the process control of this method is difficult, and the growth of silver powder is also difficult to control, so the stability of the prepared material is low.
[0005] After searching the prior art, it was found that Chinese invention patent CN101654746B discloses a method of adding carbonaceous substances in the preparation of electrical contact materials. After drying and heat treatment, the organic matter on the surface of the metal powder forms submicron or nanometer carbon particles. The addition of carbon particles improves the overall performance of the electrical contact material, but the size of the metal powder cannot be adjusted during this process. When the biomass-derived carbonaceous intermediate is impregnated with the metal powder, the addition ratio of the carbon material is not easy to control, and it is easy to be impregnated unevenly, easy to agglomerate, and the interphase and the metal powder are not tightly combined, resulting in stable performance of the generated electrical contact material Poor sex

Method used

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  • Electrical contact material and preparation method thereof
  • Electrical contact material and preparation method thereof
  • Electrical contact material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0037] (1) Weigh 0.1g of silver nitrate and dissolve it in 10ml of absolute ethanol to prepare an ethanol solution of silver nitrate;

[0038] (2) Weigh 0.12g of ascorbic acid and add it to 10ml of absolute ethanol, then add 2ml of ethanol solution of biomass-derived carbonaceous mesophase with a concentration of 0.001g / ml, and stir;

[0039] (3) Add the solution in step (1) dropwise to the solution in step (2), add 0.02g of ferric nitrate, stir and react at a constant temperature of 40°C for 10min, centrifuge and dry to collect the surface-coated biomass derived Composite micro-nano silver powder of carbonaceous mesophase film layer;

[0040] (4) The composite micro-nano silver powder obtained in step 3 was heat-treated in a pure hydrogen atmosphere at a temperature of 600°C for 2 hours, and the biomass-derived carbonaceous mesophase film on the surface of the silver powder was converted into a diamond-like film, and then subjected to conventional The contact material prepar...

Embodiment 2

[0042](1) Weigh 0.1g of silver nitrate and dissolve it in 10ml of absolute ethanol to prepare an ethanol solution of silver nitrate;

[0043] (2) Weigh 0.1g of ascorbic acid and add it to 10ml of absolute ethanol, then add 2ml of ethanol solution of biomass-derived carbonaceous mesophase with a concentration of 0.01g / ml, and stir;

[0044] (3) Add the solution in step (1) to the solution in step (2) drop by drop, add 0.03g of nickel nitrate, and react with ultrasonic assistance at a constant temperature of 40°C for 30 minutes, centrifuge and dry to collect the surface-coated organic Composite micro-nano silver powder derived from material-derived carbonaceous mesophase film layer;

[0045] (4) The composite micro-nano silver powder obtained in step 3 was heat-treated in a pure hydrogen atmosphere at a temperature of 800°C for 6 hours, and the biomass-derived carbonaceous mesophase film on the surface of the silver powder was converted into a diamond-like film, and then subject...

Embodiment 3

[0047] (1) Weigh 0.01g of silver nitrate and dissolve it in 10ml of isopropanol to prepare an alcohol solution of silver nitrate;

[0048] (2) Weigh 0.012g of glucose and add it to 10ml of isopropanol, then add 1ml of isopropanol solution of biomass-derived carbonaceous mesophase with a concentration of 0.002g / ml, and stir;

[0049] (3) Add the solution in step (1) drop by drop to the solution in step (2), add 0.02g of cobalt nitrate, react at a constant temperature of 20°C for 1 hour, centrifuge and dry to collect biomass coated on the surface Composite micro-nano silver powder derived from carbonaceous mesophase film layer;

[0050] (4) heat-treat the composite micro-nano silver powder obtained in step 3 under a hydrogen-nitrogen mixed gas atmosphere at a temperature of 900°C for 2 hours, and the biomass-derived carbonaceous mesophase film on the surface of the silver powder is converted into a diamond-like film, After the conventional contact material preparation process, ...

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Abstract

The present invention discloses a method for preparing an electrical contact material and an electrical contact material obtained by the method. This method includes the following steps: (1) Dissolve the metal-containing precursor, biomass-derived carbonaceous intermediate phase and reducing agent in an alcohol solvent to form an alcohol solution; (2) Dissolve the metal-containing precursor, biomass-derived carbon The mesophase and the reducing agent are dissolved in an alcoholic solvent to form an alcohol solution, mixed evenly, and fully reacted; (3) Collect the surface-coated biomass-derived carbonaceous mesophase obtained by the reaction in step (2) by centrifugation and drying. The composite micro-nano metal powder of the film layer; (4) The composite micro-nano metal powder obtained in step (3) is heat treated in a non-oxidizing atmosphere to transform the biomass-derived carbonaceous mesophase film layer into a diamond-containing phase or diamond-like diamond. phase film. This method can obtain an electrical contact material with uniform metal particle size, small particle size, and good performance including densely bonded diamond phase and diamond-like phase.

Description

technical field [0001] The present invention relates to electrical contact materials and methods for their preparation. Background technique [0002] Electrical contact materials are key materials for the preparation of electric power, electrical circuit on-off control and load current electrical appliances (such as switches, relays, starters, instruments, etc.). Electrical contact materials are the core components and key materials of electrical switches, and are responsible for the tasks of connecting and disconnecting circuits and load currents. The material properties determine the breaking capacity and contact reliability of electrical switches. [0003] Electrical contact materials mainly include, for example: silver-based electrical contact materials, copper-based electrical contact materials, silver / graphite composite materials, etc., which have good electrical wear resistance, good electrical conductivity, high resistance to welding, small contact resistance and per...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/02H01H1/021
Inventor 刘楠赵斌元赖奕坚周洁王垒
Owner SCHNEIDER ELECTRIC IND SAS
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