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A kind of titanium boride reinforced silver base contact material and preparation method thereof

A contact material, titanium boride technology, applied in the direction of contact, emergency protection device manufacturing, electrical components, etc., can solve the problems of contact resistance increase, electrical temperature rise, etc., to achieve low contact temperature rise, contact The effect of low resistance and excellent thermal conductivity

Active Publication Date: 2017-02-01
WEIFANG UNIVERSITY
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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

[0019] Make a contact with 7wt% titanium boride and silver as the balance by weight percentage:

[0020] a, powder mixing: weigh 9.3 kilograms of 300 mesh silver powders, 0.7 kilograms of titanium boride powders with an average particle size of 3 microns, put them into a ball mill or a powder mixer and mix them for 3 hours;

[0021] b. Compression: Press the uniformly mixed powder into a billet of a specified shape on a powder press, with a pressure of 350MPa;

[0022] c. Sintering: the billet is sintered under vacuum for 3 hours, and the sintering temperature is 870 degrees Celsius;

[0023] d. Re-pressing: the sintered billet is re-pressed on the press, and the pressure is 550MPa;

[0024] e. Reburning: the blank after repressing is refired under the protection of argon for 2 hours, and the refiring temperature is 900 degrees Celsius;

[0025] f. Polishing: Put the reburned blank into a centrifugal polishing machine, add 10 kg of alumina abrasives, and polish for 15 minute...

Embodiment 2

[0028] Make a contact with 20wt% titanium boride and silver as the balance by weight percentage:

[0029] a, powder mixing: weigh 8 kilograms of silver powder with an average particle size of 300 meshes and 2 kilograms of titanium boride powder with an average particle size of 1.5 microns, put it into a ball mill or a powder mixer and mix it for 2 hours;

[0030] b. Compression: Press the uniformly mixed powder into a billet with a specified shape on a powder press, with a pressure of 230MPa;

[0031] c. Sintering: the blank is sintered under vacuum for 4 hours, and the sintering temperature is 900 degrees Celsius;

[0032] d. Re-pressing: the sintered billet is re-pressed on the press, and the pressure is 450MPa;

[0033] e. Reburning: the billet after repressing is refired under the protection of argon for 3 hours, and the reburning temperature is 870 degrees Celsius;

[0034] f. Polishing: Put the refired billet into a centrifugal polishing machine, add 10 kg of alumina a...

Embodiment 3

[0037] Make a contact with 10wt% titanium boride, 5% chromium, and silver as the balance by weight percentage:

[0038] a, powder mixing: weighing 8.5 kilograms of 300 mesh silver powder, 1 kilogram of titanium boride powder with an average particle size of 1 micron, and 0.5 kilograms of chromium powder with an average particle size of 3 microns are put into a ball mill or a powder mixer for 4 hours;

[0039] b. Compression: Press the uniformly mixed powder into a billet of a specified shape on a powder press, with a pressure of 350MPa;

[0040] c. Sintering: the billet is sintered under vacuum for 2 hours, and the sintering temperature is 900 degrees;

[0041] d. Re-pressing: the sintered billet is re-pressed on the press, and the pressure is 700MPa;

[0042] e. Reburning: The billet after repressing is refired under the protection of argon for 4 hours, and the refiring temperature is 950 degrees;

[0043] f. Polishing: Put the refired blank into a centrifugal polishing mac...

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Abstract

The invention provides a titanium boride enhancement silver-based contact material and a preparing method of the contact material. The contact material is mainly composed of, by weight, 7-25% of titanium boride and the balance silver, or composed of, by weight, 7-25% of titanium boride, 0.01-7% of one or more mixtures of copper, nickel and chromium, and the balance silver. The preparing method comprises the steps of powder mixing, pressing, sintering, re-pressing, re-sintering and polishing. The titanium boride enhancement silver-based contact material is good in welding resistance, the preparing method is simple and practical, and the silver-based contact material has the arc ablation resisting characteristic, can be used for a long term, and has the advantages that contact resistance among resistors is low, and temperature of the contacts rises slowly and stably.

Description

technical field [0001] The invention relates to a titanium boride reinforced silver-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 copper 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H1/023H01H11/04H01H69/00
CPCH01H1/023H01H11/048H01H69/00
Inventor 刘均波王立梅刘均海宋桂香
Owner WEIFANG UNIVERSITY
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