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Silver-based and titanium-carbide-based contact material and preparation method thereof

A contact material, titanium carbide technology, used in cable/conductor manufacturing, electrical components, non-metallic conductors, etc., can solve the problems of increased contact resistance of contacts, increased temperature of electrical appliances, etc. Effects of low electrical resistance and good oxidation resistance

Inactive Publication Date: 2014-09-17
哈尔滨东大高新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the long-term use of this contact material with tungsten and tungsten carbide as the main additive phase, both tungsten and tungsten carbide will be oxidized, and react with silver to form non-conductive silver tungstate on the contact surface, making the gap between the contacts The contact resistance increases, resulting in an excessive temperature rise of the electrical appliance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Make contacts with 3% titanium carbide and silver balance by weight percentage:

[0026] A, powder mixing: 19.4 kilograms of weighing-200 order silver powders, 0.6 kilograms of titanium carbide powders with an average particle size of 3 microns, put into a V-type forced powder mixer and mix powder for 3 hours;

[0027] b. Compression: Press the uniformly mixed powder into a billet of a specified shape on a powder press, with a pressure of 350MPa;

[0028] c. Sintering: the billet is sintered under vacuum for 3 hours, and the sintering temperature is 850 degrees;

[0029] d. Recompression: Recompress the sintered billet on the crank press with a pressure of 500MPa;

[0030] e. Reburning: The blank after repressing is refired under the protection of argon for 2 hours, and the refiring temperature is 900 degrees;

[0031] f. Polishing: Put the refired blank into a centrifugal polishing machine, add 20 kg of alumina abrasives, and polish for 15 minutes.

Embodiment 2

[0033] Make contacts with 40% titanium carbide and silver balance by weight percentage:

[0034] A, powder mixing: weigh 12 kilograms of silver powders with an average particle size of 0.8 microns, and 8 kilograms of titanium carbide powders with an average particle size of 1.5 microns, put them into a V-type forced powder mixer and mix them for 2 hours;

[0035] b. Compression: Press the uniformly mixed powder into a billet of a specified shape on a powder press with a pressure of 150MPa;

[0036] c. Infiltration: Place a thin silver sheet on the billet. The weight of the silver sheet is the same as that of the billet. Send it into the infiltration furnace, and infiltrate the thin silver sheet into the billet under the protection of argon. The infiltration temperature is 1050 degrees. , the infiltration time is 1 hour;

[0037] d. Polishing: Put the infiltrated blank into a centrifugal polishing machine, add 20 kg of alumina abrasives, and polish for 15 minutes.

Embodiment 3

[0039] Make contacts with 3% titanium carbide, 0.01% diamond, and silver balance by weight percentage:

[0040] a, powder mixing: Weigh 19.398 kg of -200 mesh silver powder, 0.6 kg of titanium carbide powder with an average particle size of 1 micron, and 0.002 kg of diamond powder with an average particle size of 1 micron into a V-type forced powder mixer for powder mixing 3 hours;

[0041] b. Compression: Press the uniformly mixed powder into a billet of a specified shape on a powder press with a pressure of 300MPa;

[0042] c. Sintering: the billet is sintered under vacuum for 3 hours, and the sintering temperature is 880 degrees;

[0043] d. Recompression: Recompress the sintered billet on the crank press with a pressure of 500MPa;

[0044] e. Reburning: The blank after repressing is refired under the protection of argon for 2 hours, and the refiring temperature is 900 degrees;

[0045] f. Polishing: Put the refired blank into a centrifugal polishing machine, add 20 kg o...

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PUM

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Abstract

The invention provides a silver-based and titanium-carbide-based contact material and a preparation method thereof. The silver-based and titanium-carbide-based contact material comprises, by weight, 3%-40% of titanium carbide and the balance silver, or comprises, by weight, 3%-40% of titanium carbide, 0.01%-5% of carbon and the balance silver, or comprises, by weight, 3%-40% of titanium carbide, 0.01%-4% of a mixture of one or several kinds of iron, cobalt and nickel and the balance silver, or comprises, by weight, 3%-40% of titanium carbide, 0.01%-5% of carbon, 0.01%-4% of a mixture of one or several kinds of iron, cobalt and nickel and the balance silver. A power metallurgic method and an infiltration method are adopted in the preparation method. The silver-based and titanium-carbide-based contact material has the advantages that welding resistance is good, arc erosion resistance is achieved, under the condition of long-time use, contact resistance between contacts is low, and contact temperature rising is low and stable.

Description

technical field [0001] The invention relates to a silver and titanium carbide-based contact material and a preparation method thereof. Background technique [0002] Contacts are the core components of low-voltage electrical appliances, which play the role of connecting, carrying and breaking currents. Their pros and cons directly affect the safety and reliability of low-voltage electrical appliances. At present, low-voltage circuit breakers mostly use silver tungsten, silver tungsten carbide, and silver tungsten carbide graphite as contact materials, which are widely used because of their good anti-welding performance and arc ablation resistance. However, during the long-term use of this contact material with tungsten and tungsten carbide as the main additive phase, both tungsten and tungsten carbide will be oxidized, and react with silver to form non-conductive silver tungstate on the contact surface, making the gap between the contacts The contact resistance increases, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/06H01B13/00C22C5/06C22C32/00
Inventor 杨丛涛柳国春倪树春
Owner 哈尔滨东大高新材料股份有限公司
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