A kind of preparation method of silver-nickel-zinc oxide electrical contact alloy

A technology of silver zinc oxide and zinc oxide, applied in silver compounds, silver compounds, chemical instruments and methods, etc., can solve the problem of poor processing performance and welding performance, poor welding resistance and arc erosion resistance of AgNi contacts, etc. problems, to achieve the effect of easy processing and molding, reducing the amount of silver used, and avoiding easy pollution

Active Publication Date: 2022-05-27
XI'AN POLYTECHNIC UNIVERSITY
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Problems solved by technology

[0003] The typical representative of silver-metal system alloy is AgNi alloy. The AgNi contact material has good electrical and thermal conductivity, low and stable contact resistance, easy processing and low cost, etc. Poor arc erosion performance limits the application of this material
The contact of silver-metal oxide system has good resistance to welding and arc ablation, but its processing performance and welding performance continue to deteriorate with the increase of oxide content.

Method used

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  • A kind of preparation method of silver-nickel-zinc oxide electrical contact alloy

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preparation example Construction

[0025] A preparation method of a silver-nickel-zinc oxide electrical contact alloy of the present invention is specifically implemented according to the following steps:

[0026] Step 1. Preparation of Zn(NO 3 ) 2 and AgNO 3 mixed solution A;

[0027] First add Zn powder to HNO with a mass fraction of 50% to 65% 3 fully dissolved in the solution to obtain 1.5mol / L Zn(NO 3 ) 2 solution; then Zn(NO 3 ) 2 The solution was slowly added to 1.5mol / L AgNO 3 In aqueous solution, mixed solution A was obtained.

[0028] Step 2, adding a polyvinylpyrrolidone solution as a dispersing agent to the mixed solution A, and after stirring evenly, dropwise adding an ascorbic acid solution to it as a reducing agent, and stirring continuously to obtain a mixed solution B;

[0029] The concentration of the polyvinylpyrrolidone solution is 0.2-0.8 mol / L, and the concentration of ascorbic acid is 1-2 mol / L.

[0030] Step 3, adding ammonia water dropwise to the mixed solution B and adjusting...

Embodiment 1

[0041] Step 1. First add Zn powder to HNO with a mass fraction of 50% 3 fully dissolved in the solution to obtain 1.5mol / L Zn(NO 3 ) 2 solution; then Zn(NO 3 ) 2 The solution was slowly added to 1.5mol / L AgNO 3 In the aqueous solution, mixed solution A is obtained;

[0042] Step 2. The mixed solution A is magnetically stirred at 55°C for 2 hours, and 50 ml of a 0.4 mol / L polyvinylpyrrolidone solution is added dropwise to the mixed solution A as a dispersant within the first 30 minutes of stirring. The ascorbic acid solution of 1mol / L was added thereto as a reducing agent, and was continuously stirred to obtain mixed solution B;

[0043] Step 3. The mixed solution B was subjected to ultrasonic stirring at 40°C for 30 minutes, and during the process, the pH value of the solution was adjusted to 9 by dropwise addition of ammonia water. After the dropwise addition was completed, a magnetic stirrer was used to stir for 0.5 hours until the precipitation was complete. , to obta...

Embodiment 2

[0049] Step 1. First add Zn powder to HNO with a mass fraction of 60% 3 fully dissolved in the solution to obtain 1.5mol / L Zn(NO 3 ) 2 solution; then Zn(NO 3 ) 2 The solution was slowly added to 1.5mol / L AgNO 3 In the aqueous solution, mixed solution A is obtained;

[0050] Step 2. The mixed solution A was magnetically stirred at 55 °C for 2 hours, and 50 ml of a 0.6 mol / L polyvinylpyrrolidone solution was added to the mixed solution A within the first 30 minutes, and then 1.5 mol / L of ascorbic acid solution was added to it. , and continuously stirred to obtain mixed solution B;

[0051] Step 3. The mixed solution B was subjected to ultrasonic stirring at 50° C. for 1 h, and during the process, the pH value of the solution was adjusted to 10 by dropwise addition of ammonia water, and then stirred for 30 min after the dropwise addition was completed, until the precipitation was complete, and a precipitated product was obtained;

[0052] Step 4. First put the precipitated ...

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Abstract

A method for preparing a silver-nickel-zinc oxide electrical contact alloy disclosed by the invention comprises the following steps: preparing Zn(NO 3 ) 2 and AgNO 3 Mixed solution A, add polyvinylpyrrolidone solution and ascorbic acid solution in sequence to mixed solution A, and stir evenly to obtain mixed solution B, add ammonia water to mixed solution B and adjust the pH value to obtain a precipitated product, which is prepared by using the precipitated product Silver-zinc oxide composite powder, put the silver-zinc oxide composite powder and Ni powder into the ball mill in proportion to ball mill and mix the powder, and after annealing in the atmosphere of reducing gas, the uniformly mixed silver-nickel-zinc oxide composite powder is obtained. The powder is prepared by preparing the silver-nickel-zinc oxide composite powder into a silver-nickel-zinc oxide electrical contact alloy. It can ensure that the contact material has high electrical and thermal conductivity.

Description

technical field [0001] The invention belongs to the technical field of alloy preparation methods, and relates to a preparation method of a silver-nickel-zinc oxide electric contact alloy. Background technique [0002] For low-voltage electrical equipment in the field of energy technology, such as circuit breakers, relays, transfer switches, and contact materials in contactors, two types of contact materials are well known to the public, one is silver-metal system, and the other is It is a silver-metal oxide system. [0003] The typical representative of silver-metal system alloy is AgNi alloy. AgNi contact material has the advantages of good electrical and thermal conductivity, low and stable contact resistance, easy processing and forming, and low cost. The poor arc erosion performance limits the application of this material. The silver-metal oxide system contacts have good resistance to fusion welding and arc ablation, but their processability and welding performance con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/12C22C1/05C22C5/06C22C32/00C01G9/02C01G5/00
CPCC22C1/05C22C5/06C22C32/0021C01G5/00C01G9/02B22F9/24B22F1/142
Inventor 付翀王俊勃贺辛亥侯锦丽郭天福徐洁
Owner XI'AN POLYTECHNIC UNIVERSITY
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