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A method for preparing silver-tin oxide electrical contact material by sol-gel technology

A technology of electric contact material and gel technology, which is applied in the field of preparation of silver-tin oxide electric contact materials, can solve the problems of difficult control of tin oxide size, limited application range of electric contact materials, high powder temperature, etc. The content is easy to control, it is convenient for subsequent processing, and the effect of anti-welding and arc erosion resistance is improved

Active Publication Date: 2017-03-29
NORTHEASTERN UNIV LIAONING
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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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  • A method for preparing silver-tin oxide electrical contact material by sol-gel technology
  • A method for preparing silver-tin oxide electrical contact material by sol-gel technology

Examples

Experimental program
Comparison scheme
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

A method of preparing silver-tin oxide electrical contact materials using sol-gel technology, using tin oxide powder with a particle size of 20 nm to 100 μm and silver nitrate as raw materials; first, the silver nitrate is prepared into an aqueous solution of a certain concentration; then a certain concentration is added amount of glycine; then add tin oxide; then add a certain amount of ethylene glycol, and adjust the pH value with ammonia water to obtain a stable suspension; heat the suspension to form a gel; dry the gel into a xerogel; dry the xerogel Calcined to obtain silver-tin oxide composite powder; the composite powder is hot-pressed into silver-tin oxide electrical contact material. This method can be used to prepare silver-based electrical contact materials reinforced with tin oxide particles of any size in the range of 20nm to 100μm to meet the requirements of different circuit loads; other additives can be easily added during the sol-gel process without loss of material, thus saving money. Silver resources; xerogel is calcined into composite powder at low temperature and low energy consumption; tin oxide is evenly dispersed in the silver matrix, the material density and hardness are high, and it has good 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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Patent Type & Authority Patents(China)
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 LIAONING