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Method for preparing silver-tin oxide electrical contact material by virtue of sol-gel technique

A technology of electric contact material and gel technology, which is applied in the field of preparing silver-tin oxide electric contact materials, can solve the problems of high powder temperature, limited application range of electric contact materials, and difficulty in controlling the size of tin oxide, etc., and achieves Improved anti-welding and arc erosion resistance, easy subsequent processing, and increased density

Active Publication Date: 2015-04-08
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method using stannous nitrate as a raw material has a good dispersion effect, does not need to wash the powder, and there is almost no loss of components, but this method can only prepare tin oxide dispersion-strengthened silver-based electrical contact materials with a particle size range of 20-60nm
At the same time, the specific size of tin oxide is difficult to control in this method, and the sol is calcined into Ag-SnO 2 Defects such as high powder temperature (above 400°C)
[0010] Because tin oxide dispersion strengthened silver-tin oxide electrical contact materials with different particle sizes have different "personality", that is, for different loading conditions, tin oxide with different particle sizes needs to be used for strengthening, so the electrical contacts prepared by the above method The range of application of the material is limited

Method used

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  • Method for preparing silver-tin oxide electrical contact material by virtue of sol-gel technique
  • Method for preparing silver-tin oxide electrical contact material by virtue of sol-gel technique

Examples

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Effect test

Embodiment 1

[0035] This embodiment is to prepare a silver-tin oxide electrical contact material with a mass percentage of 88% silver and 12% tin oxide, and proceed according to the following steps:

[0036] (1) Raw material configuration

[0037] In this embodiment, silver nitrate and tin oxide powder with an average particle size of 20nm are used as raw materials, calculated according to the mass percentage of silver and tin oxide in the electrical contact material, and 2.4g of tin oxide powder and 27.7g of silver nitrate are weighed for future use;

[0038] (2) the silver nitrate raw material that takes by weighing is added in deionized water, is mixed with the silver nitrate aqueous solution of 0.1mol / L;

[0039] (3) Weigh 6.1 g of glycine according to the silver nitrate and glycine molar ratio of 2:1, add it to the silver nitrate aqueous solution in step (2), stir until completely dissolved, and obtain a clear and transparent solution;

[0040] (4) Add the tin oxide raw material that...

Embodiment 2

[0048] This embodiment is to prepare a silver-tin oxide electrical contact material with a mass percentage of 90% silver and 10% tin oxide, and proceed according to the following steps:

[0049] (1) Raw material configuration

[0050] In this embodiment, silver nitrate and tin oxide powder with an average particle size of 200 nm are used as raw materials, calculated according to the mass percentage of silver and tin oxide in the electrical contact material, and 2.0 g of tin oxide powder and 28.3 g of silver nitrate are weighed for future use;

[0051] (2) the silver nitrate raw material that takes by weighing is added in deionized water, is mixed with the silver nitrate aqueous solution of 0.5mol / L;

[0052] (3) Weigh 12.5 g of glycine according to the silver nitrate and glycine molar ratio of 1:1, add it to the silver nitrate aqueous solution in step (2), stir until completely dissolved, and obtain a clear and transparent solution;

[0053] (4) Add the tin oxide raw material t...

Embodiment 3

[0061] This embodiment is to prepare a silver-tin oxide electrical contact material with a mass percentage of 94% silver and 6% tin oxide, and proceed according to the following steps:

[0062] (1) Raw material configuration

[0063] In this embodiment, silver nitrate and tin oxide powder with an average particle size of 5 μm are used as raw materials, calculated according to the mass percentage of silver and tin oxide in the electrical contact material, and 12.0 g of tin oxide powder and 296.1 g of silver nitrate are weighed for future use;

[0064] (2) the silver nitrate raw material that takes by weighing is added in deionized water, is mixed with the silver nitrate aqueous solution of 1mol / L;

[0065] (3) Weigh 523.3 g of glycine according to the silver nitrate and glycine molar ratio of 1:4, add it to the silver nitrate aqueous solution in step (2), stir until completely dissolved, and obtain a clear and transparent solution;

[0066] (4) Add the tin oxide raw material t...

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Abstract

The invention relates to a method for preparing a silver-tin oxide electrical contact material by virtue of a sol-gel technique. The method comprises the following steps: with tin oxide powder and silver nitrate with the particle sizes from 20 nanometers to 100 microns as raw materials, firstly preparing silver nitrate into a water liquid with a certain concentration; adding a proper amount of glycine; adding tin oxide; adding a certain amount of glycol, and regulating the pH value with ammonia water, so as to obtain a stable suspension liquid; heating the suspension liquid to form gel; drying gel to form xerogel; calcining xerogel to obtain silver-tin oxide compound powder; and carrying out hot pressing on the compound powder to prepare a silver-tin oxide electrical contact material. The method can be used for preparing electrical contact materials with any particle size from 20 nanometers to 100 microns and can meet requirements of different circuit loads, and the silver bases of the electrical contact materials are strengthened by tin oxide particles; other addition components are easily added in a sol-gel process, the material loss is avoided, and the silver resource is saved; the temperature of the process for calcining xerogel into the compound powder is low, and the energy consumption is low; and tin oxide is uniformly dispersed in the silver base, so that the material is high in density and the rigidity and good in electrical conductivity, welding resistance and arc erosion resistance.

Description

technical field [0001] The invention relates to a conductive contact material, in particular to a method for preparing silver-tin oxide composite powder by gel-sol technology, and preparing the silver-tin oxide electric contact material by hot pressing the composite powder. Background technique [0002] With the development of the electrical industry, from household electrical appliances to military industry, from automobile industry to aerospace, from precision instruments related to low-level signal currents to high-power motors and generators, the requirements for electrical contacts in various industries are increasing day by day. [0003] In Ag-MeO materials, Ag and MeO act synergistically and complement each other, which has attracted extensive attention. Among them, Ag-CdO was once known as the "universal contact" in low-to-medium load circuits, but it has cadmium pollution. With the improvement of people's environmental awareness, it is urgent to find an electrical ...

Claims

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Application Information

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IPC IPC(8): C23C18/12H01H1/0237
Inventor 孙旭东林智杰刘绍宏果天龙孙姗刘满门霍地张牧朱琦
Owner NORTHEASTERN UNIV
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