Silver-nickel-based electrical contact material and preparation method thereof

An electric contact material, silver-nickel-based technology, applied in the field of powder metallurgy, can solve the problems of reduced electrical life and breaking capacity, poor resistance to arc burning, and oxidation of contact materials, and achieves improved welding resistance and anti-corrosion resistance. High weldability and burnout resistance, weak oxidation resistance

Active Publication Date: 2012-03-28
ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Through retrieval, the latest Chinese Patent Publication No. CN101608272A discloses the AgNi electrical contact material and its preparation method, which is modified by adding tungsten carbide to the silver-nickel material. The oxidation ability is poor, and the contact material often works in the arc discharge environment, which leads to the oxidation of the contact material, and the arc burning resistance is poor, which seriously reduces its electrical life and breaking capacity.

Method used

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  • Silver-nickel-based electrical contact material and preparation method thereof
  • Silver-nickel-based electrical contact material and preparation method thereof
  • Silver-nickel-based electrical contact material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) first 69.9wt% Ag powder and 30wt% Ni powder are passed through a 200 mesh sieve; the Ni powder in this embodiment is reduced nickel powder, one is to remove oxides on the powder surface; the other is to reduce the moisture content in the powder ; The third is to improve the surface activity of the powder;

[0026] (2) Mix and ball mill with 0.1wt% TaC (1-2 μm) powder afterwards;

[0027] (3) Then add the binder to the ball-milled powder, and sieve and granulate:

[0028] (4) Molding the granulated powder on a hydraulic press with a pressure of 400MPa;

[0029] (5) Degreasing and sintering the green compact under a hydrogen atmosphere, the debinding temperature is 320°C, and it is kept for 1h, and then the temperature is raised to 900°C for 5h;

[0030] (6) The sintered green body is repressed on the hydraulic press again, and the pressing pressure is 600MPa;

[0031] (7) Annealing the repressed product under a hydrogen protective atmosphere, the annealing tempera...

Embodiment 2

[0036] (1) at first 65wt% Ag powder and 30wt% Ni powder are crossed 200 mesh sieves;

[0037] (2) Mix ball milling with 5wt% TaC (1~2μm) powder afterwards;

[0038] (3) Then add the binder to the ball-milled powder, and sieve and granulate:

[0039] (4) Molding the granulated powder on a hydraulic press with a pressure of 400MPa;

[0040] (5) Degreasing and sintering the green compact under a hydrogen atmosphere, the debinding temperature is 320°C, and it is kept for 1h, and then the temperature is raised to 900°C for 5h;

[0041] (6) The sintered green body is repressed on the hydraulic press again, and the pressing pressure is 600MPa;

[0042] (7) Annealing the repressed product under a hydrogen protective atmosphere, the annealing temperature is 600°C, and the time is 3h;

[0043] (8) The annealed green body is then repressed for the second time on a hydraulic press, and the pressing pressure is 1400MPa.

[0044] After testing, the density of the AgNi-based electrical c...

Embodiment 3

[0046] (1) at first 67wt% Ag powder and 30wt% Ni powder are crossed 200 mesh sieves;

[0047] (2) Mix ball milling with 3wt%wtTaC (1~2μm) powder afterwards;

[0048] (3) Then add the binder to the ball-milled powder, and sieve and granulate:

[0049] (4) Molding the granulated powder on a hydraulic press with a pressure of 400MPa;

[0050] (5) Degreasing and sintering the green compact under a hydrogen atmosphere, the debinding temperature is 320°C, and it is kept for 1h, and then the temperature is raised to 900°C for 5h;

[0051] (6) The sintered green body is repressed on the hydraulic press again, and the pressing pressure is 600MPa;

[0052] (7) Annealing the repressed product under a hydrogen protective atmosphere, the annealing temperature is 600°C, and the time is 3h;

[0053] (8) The annealed green body is then repressed for the second time on a hydraulic press, and the pressing pressure is 1400MPa.

[0054] After testing, the density of the AgNi-based electrical ...

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Abstract

The invention discloses a silver-nickel-based electrical contact material and a preparation method thereof. The electrical contact material contains the following components in weight percent: 10-30 percent of nickel, 0.1-10 percent of tantalum carbide (TaC) and the balance of silver. The invention mainly considers the distribution and the enhancement effect of ceramic phase particles, and a ball-milling process, a pressing process, a sintering process, a repressing process and an annealing process are adopted as manufacturing processes. Since the TaC has high hardness, high strength and highmelting point and has better bond strength with the silver and the nickel, compared with common Ag-Ni materials, the electrical contact material has higher fusion welding resistance as well as electric arc burning loss resistance and longer electric service life and is mainly applied to the contacts of low-voltage electrical power distribution apparatus.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and specifically refers to an electric contact material and a preparation method thereof, in particular to a silver-nickel (AgNi)-based electric contact material with high welding resistance for power distribution appliances and a preparation method thereof. Background technique [0002] Silver-nickel (AgNi)-based contact material has good electrical and thermal conductivity, low and stable contact resistance, excellent arc erosion resistance, easy processing, excellent welding performance, and can be directly welded to the contact base from wire or formed strip , the material can be effectively utilized. In addition, the material is cheap to manufacture and suitable for mass production. Therefore, AgNi material has always been the preferred contact material in small and medium-capacity control appliances. Disadvantages of the material - the poor performance of welding resistance has ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C5/06B22F3/16H01H1/02
Inventor 谢继峰柏小平翁桅颜小芳
Owner ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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