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Ag based electrical contact material and preparation method thereof

A technology of electrical contact material and bulk material, applied in contacts, circuits, electrical switches, etc., can solve the problems of poor wetting of graphite particles and Ag metal, weak resistance to arc ablation, slow arc transfer speed, etc. The effect of increasing electrical contact properties such as anti-welding, improving electrical conductivity and good wettability

Active Publication Date: 2010-05-12
WENZHOU HONGFENG ELECTRICAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as the literature: Wu Chunping pointed out in the article "Silver-based Electrical Contact Materials" published in "Yunnan Metallurgy" 2005 (34) 1 that Ag-graphite materials have excellent anti-welding properties, but due to the arc of Ag-C materials during use The transfer speed is slow, which easily causes the local melting of the material to intensify. At the same time, due to the poor wetting between the graphite particles and the Ag metal, the Ag-C material has the problem of weak arc ablation resistance during use.

Method used

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  • Ag based electrical contact material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. First, calculate the required amount of graphite and nickel nitrate according to the ratio of the prepared Ag-4C (graphite)-0.5Ni material, then immerse the required graphite powder in the nickel nitrate solution and stir to disperse for 10 minutes, then add KOH solution until the precipitation no longer occurs , filtered and dried to obtain Ni(OH) deposited on the surface 2 Graphite powder, wherein the average particle size of graphite powder is 50 μm;

[0033] 2. Restore the surface-treated graphite powder in hydrogen at 500°C for 0.5h;

[0034] 3. Afterwards, mix the reduced graphite powder with Ag powder, the speed is 15r / min, and the time is 10h;

[0035] 4. Then press the mixed powder into a green body under the isostatic pressure of 100MPa;

[0036] 5. Sinter the compact at 950°C for 5 hours in a hydrogen atmosphere;

[0037] 6. Then hot-press the sintered body, the hot-pressing temperature is 500°C, the hot-pressing pressure is 700MPa, and the pressure is ...

Embodiment 2

[0041] 1. First, calculate the required amount of carbon and nickel nitrate according to the ratio of the prepared Ag-5C (carbon)-5Ni material, then immerse the required carbon powder in the nickel nitrate solution and stir and disperse for 10 minutes, add KOH solution until the precipitation no longer occurs, Filter and dry to obtain Ni(OH) deposited on the surface 2 carbon powder, wherein the average particle size of the carbon powder is 0.5 μm;

[0042] 2. Restore the surface-treated carbon powder in hydrogen at 800°C for 1 hour;

[0043] 3. After that, mix the reduced carbon powder with Ag powder, the speed is 30r / min, and the time is 5h;

[0044] 4. Then press the mixed powder into a green body under the isostatic pressure of 500MPa;

[0045] 5. Sinter the compact at 750°C for 10 hours in a hydrogen atmosphere;

[0046] 6. Then hot press the sintered body, the hot pressing temperature is 950°C, the hot pressing pressure is 100MPa, and the pressure is maintained for 60 ...

Embodiment 3

[0050] 1. First, calculate the required amount of carbon powder and nickel nitrate according to the ratio of the prepared Ag-1C (carbon)-3Ni material, then immerse the required carbon powder in the nickel nitrate solution and stir and disperse for 10 minutes, then add KOH solution until the precipitation no longer occurs , filtered and dried to obtain Ni(OH) deposited on the surface 2 carbon powder, wherein the average particle size of the carbon powder is 15 μm;

[0051] 2. Restore the surface-treated carbon powder in hydrogen at 700°C for 40 minutes;

[0052] 3. After that, Ni(OH) will be deposited 2 Carbon powder and Ag powder are mixed, the speed is 20r / min, and the time is 7h;

[0053] 4. Then press the mixed powder into a green body under an isostatic pressure of 400MPa;

[0054] 5. Sinter the compact at 900°C for 8 hours in a hydrogen atmosphere;

[0055] 6. Then hot-press the sintered body, the hot-pressing temperature is 550°C, the hot-pressing pressure is 700MPa,...

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Abstract

The invention discloses an Ag based electrical contact material and a preparation method thereof. The material comprises the following components in percentage by weight: not more than 1 and not less than 5 percent of carbon material, not more than 0.5 and not less than 5 percent of additive and the balance of silver, wherein the carbon material relates to one or more of diamond, graphite and carbon, and the additive relate to one of W and Ni elements. The high melting point character of the carbon material is helpful to improve the melting-welding resistance of the surface of a contact, and the superfine W and Ni elements are added by using a liquid phase deposition surface pretreatment method, thereby ensuring that the W or Ni element is uniformly distributed on the surfaces of carbon reinforced particles, improving the electrical conductivity of the reinforced particles and prolonging the service life of the contact material. The Ag based electrical contact material with fine capabilities of melting-welding resistance and electric arc burn resistance is obtained by combining the working procedures such as mixing powder, compacting, sintering, extruding and the like.

Description

technical field [0001] The invention relates to an electrical contact material in the technical field of powder alloy materials, in particular to an Ag-based electrical contact material and a preparation method thereof. Background technique [0002] Ag-based contact materials have good electrical and thermal conductivity, low and stable contact resistance, and excellent corrosion resistance. The main reinforcement phase types of Ag-based electrical contact materials are C, WC, W, Ni, SnO 2 , CdO, ZnO and other substances, the main way of adding the reinforcement phase is to add in the form of particles. Such as the literature: Wu Chunping pointed out in the article "Silver-based Electrical Contact Materials" published in "Yunnan Metallurgy" 2005 (34) 1 that Ag-graphite materials have excellent anti-welding properties, but due to the arc of Ag-C materials during use The transfer speed is slow, which easily causes the local melting of the material to intensify. At the same t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H1/0233H01H11/04C22C5/06C22C1/05C22F1/14B22F3/16
Inventor 陈乐生甘可可祁更新陈晓
Owner WENZHOU HONGFENG ELECTRICAL ALLOY
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