Silver-vanadium-based contact material and preparation method thereof

A contact material and contact technology, applied in the field of silver vanadium contact material and its preparation, can solve the problems that silver nickel 10 is prone to fusion welding, silver tin oxide is difficult to process, and cannot be used in electrical appliances, etc., so as to improve the resistance to fusion welding Ability, anti-welding performance is good, the effect of reducing welding force

Inactive Publication Date: 2020-04-10
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

Among them, silver-nickel 10 contact material is widely used in electrical appliances such as relays and wall switches with rated current less than 10A because of its strong arc resistance, low and stable contact resistance, and easy processing; however, silver-nickel 10 is easy to Welding occurs and cannot be applied to electrical appliances with higher current ratings
At present, silver cadmium oxide or silver tin oxide contact material is mostly used in relays and wall switches with a rated current greater than 10A, but silver cadmium oxide is poisonous and has been banned by EU RoHS; silver tin oxide is difficult to process and prone to temperature rise Case

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Make a contact with 10% vanadium and silver balance by weight percentage:

[0018] Step 1, powder mixing: Weigh 18Kg of -200 mesh silver powder and 2Kg of vanadium powder with an average particle size of 3 μm, and put it into a V-type forced powder mixer for powder mixing for 3 hours;

[0019] Step 2, pressing: use a cold isostatic press to press the uniformly mixed powder into a billet with a diameter of 100mm, and the pressure is 300MPa;

[0020] Step 3, sintering: the billet is sintered under vacuum for 2 hours, and the sintering temperature is 850°C;

[0021] Step 4, extruding: the sintered billet is hot-extruded on an extruder at an extrusion temperature of 600° C.; extruded into a wire with a diameter of 8 mm.

[0022] Step 5, cold drawing: cold drawing the extruded wire to reach the specified 1.38mm;

[0023] Step 6. Stress relief annealing: anneal the wire under the protection of argon for 1 hour, and the annealing temperature is 600°C

[0024] Step 7, nailin...

Embodiment 2

[0028] Make a contact with 30% vanadium and silver balance by weight percentage:

[0029] Step 1, powder mixing: Weigh 14Kg of -200 mesh silver powder and 6Kg of vanadium powder with an average particle size of 3 μm, and put it into a V-shaped forced powder mixer for powder mixing for 3 hours;

[0030] Step 2, pressing: use a cold isostatic press to press the uniformly mixed powder into The billet, the pressure is 300MPa;

[0031] Step 3, sintering: the billet is sintered under vacuum for 2 hours, and the sintering temperature is 850°C;

[0032] Step 4. Extrusion: the sintered billet is hot-extruded on an extruder at an extrusion temperature of 750° C.; extruded into a 5 mm thick plate.

[0033] Step 5, rolling: rolling the extruded plate to 2mm;

[0034] Step 6. Stress relief annealing: anneal the plate under the protection of argon for 1 hour, and the annealing temperature is 750°C

[0035] Step 7. Punching: blanking the sheet material reaching the specified size into a...

Embodiment 3

[0039] Make a contact with 10% vanadium, 0.1% C and silver balance by weight percentage:

[0040] Step 1, powder mixing: Weigh 17.98Kg of -200 mesh silver powder, 2Kg of vanadium powder with an average particle size of 3μm, and 0.02Kg of carbon powder with an average particle size of 8μm, and put them into a V-shaped forced powder mixer for 3 hours;

[0041] Step 2, pressing: use a cold isostatic press to press the uniformly mixed powder into The billet, the pressure is 300MPa;

[0042] Step 3, sintering: the billet is sintered under vacuum for 2 hours, and the sintering temperature is 850°C;

[0043] Step 4. Extrusion: the sintered billet is hot-extruded on an extruder at an extrusion temperature of 600° C.; extruded into a 4 mm thick plate.

[0044] Step 5, rolling: rolling the extruded plate to 0.8mm;

[0045] Step 6. Stress relief annealing: anneal the plate under the protection of argon for 1 hour, and the annealing temperature is 600°C

[0046] Step 7. Punching: bla...

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Abstract

The invention provides a silver-vanadium-based contact material and a preparation method thereof. The formula comprises the following components of, in percentage by weight, 10-30% of vanadium or also0.1-5% of carbon, and the balance silver. The preparation method adopts a powder metallurgy method. The silver-vanadium-based contact material has the characteristics of good fusion welding resistance and arc ablation resistance, and also has the advantages of low contact resistance between contacts and low and stable temperature rise of the contacts under the long-term use condition. The material can be applied to appliances of 16A or even 25A or more. A proper amount of carbon is added into the contact material, so that the fusion welding force of the material can be further reduced, the fusion welding resistance of the material is improved, and the contact material can be used on circuit breakers with higher fusion welding resistance requirements.

Description

technical field [0001] The invention relates to a silver vanadium 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. Among them, silver-nickel 10 contact material is widely used in electrical appliances such as relays and wall switches with rated current less than 10A because of its strong arc resistance, low and stable contact resistance, and easy processing; however, silver-nickel 10 is easy to Welding occurs and cannot be applied to electrical appliances with higher current ratings. At present, silver cadmium oxide or silver tin oxide contact material is mostly used in relays and wall switches with a rated current greater than 10A, but silver cadmium oxide is poisonous and has been banned by EU RoHS; silver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C5/06C22C1/04B22F1/00B22F3/04B22F3/10B22F3/20B22F3/24
CPCC22C5/06C22C1/0466B22F3/04B22F3/1007B22F3/20B22F3/24B22F2003/208B22F2003/248B22F1/052
Inventor 杨丛涛
Owner 哈尔滨东大高新材料股份有限公司
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