AgNi electrical contact material and preparation method thereof

A technology for electrical contact materials and blanks, which is applied to contact materials and other directions, can solve the problems of limited improvement in welding resistance and poor welding resistance, and achieve the effect of improving welding resistance and prolonging service life.

Inactive Publication Date: 2009-12-23
WENZHOU HONGFENG ELECTRICAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] To sum up, domestic and foreign studies have done a lot of research work on improving the welding resistance of Ag-Ni materials. Mechanical alloying is easy to introduce foreign impurities, and the

Method used

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  • AgNi electrical contact material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. First pass 89.9wt% Ag powder and 10wt% Ni powder through a 200-mesh sieve;

[0035] 2. Mix and ball mill with 0.1wt% WC powder (average particle size is 0.1 μm) afterwards;

[0036] 3. Then the ball-milled powder is pressed into a green body under an isostatic pressure of 100MPa;

[0037] 4. Sinter the compact at 950°C for 5 hours in a hydrogen atmosphere;

[0038] 5. Then hot-press the sintered body, the hot-pressing temperature is 500°C, the hot-pressing pressure is 700MPa, and the pressure is kept for 5 minutes;

[0039] 6. Then refire the green body after hot pressing according to the above step 4) sintering process;

[0040] 7. Then hot-extrude the reburned green body into a wire or plate on a hydraulic press. The hot-extrusion temperature is 400°C, the hot-extrusion speed is 5cm / min, the mold preheating temperature is 100°C, and the extrusion ratio for 10.

[0041] Compared with the traditional AgNi material, the electrical life of the obtained material is ...

Embodiment 2

[0043] 1. First pass 90% Ag powder and 5wt% Ni powder through a 200-mesh sieve;

[0044] 2. Mix and ball mill with 5wt% WC powder (average particle size is 10 μm) afterwards;

[0045] 3. Then the ball-milled powder is pressed into a green body under an isostatic pressure of 500MPa;

[0046] 4. Sinter the compact at 750°C for 10 hours in a hydrogen atmosphere;

[0047] 5. 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 minutes;

[0048] 6. Then refire the green body after hot pressing according to the above step 4) sintering process;

[0049] 7. Then hot-extrude the reburned body into a wire or plate on a hydraulic press. The hot-extrusion temperature is 900°C, the hot-extrusion speed is 8cm / min, the mold preheating temperature is 500°C, and the extrusion ratio for 400.

[0050] Compared with the traditional AgNi material, the electrical life of the obtained material is incre...

Embodiment 3

[0052] 1. First pass 90wt% Ag powder and 6wt% Ni powder through a 200-mesh sieve;

[0053] 2. Mix and ball mill with 4wt% WC powder (average particle size is 0.1 μm) afterwards;

[0054] 3. Then the ball-milled powder is pressed into a green body under an isostatic pressure of 400MPa;

[0055] 4. Sinter the compact at 900°C for 8 hours in a hydrogen atmosphere;

[0056] 5. Then hot-press the sintered body, the hot-pressing temperature is 550°C, the hot-pressing pressure is 700MPa, and the pressure is maintained for 40 minutes;

[0057] 6. Then refire the green body after hot pressing according to the above step 4) sintering process;

[0058] 7. Then hot-extrude the refired green body into wire rod or plate. The hot-extrusion temperature is 450°C, the hot-extrusion speed is 8cm / min, the mold preheating temperature is 250°C, and the extrusion ratio is 250.

[0059]Compared with the traditional AgNi material, the electrical life of the obtained material is increased by 15 time...

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Abstract

The invention discloses an AgNi-base electrical contact material and a preparation method thereof and the electrical contact material comprises nickel, tungsten carbide and silver; wherein, the weight percent of nickel is not less than 5% and not more than 10%, the weight percent of tungsten carbide is not less than 0.1% and not more than 5% and the allowance is silver. In the invention, the distribution of nickel particles and the fiber orientation are considered; the manufacturing process adopts the processes of ball-milling, pressing, sintering and extruding. Owning to the high hardness, high strength and high melting point of tungsten carbide, tungsten carbide/silver bonding strength is better; comprised with the traditional AgNi electrical contact material, the AgNi electrical contact material prepared by the method of the invention has higher welding resistance and arc deterioration resistance and longer electrical life.

Description

technical field [0001] The invention relates to an electrical contact material in the technical field of powder alloy materials, in particular to an AgNi electrical contact material and a preparation method thereof. Background technique [0002] Ag-Ni contact material has good electrical and thermal conductivity, low and stable contact resistance, excellent corrosion resistance, easy processing, and excellent welding performance. In addition, the material is cheap to manufacture and suitable for mass production. Therefore, Ag-Ni material has always been the preferred contact material in small and medium capacity control electrical appliances. In recent years, various series of new circuit breakers have been continuously introduced at home and abroad. These new circuit breakers require smaller volume and higher breaking capacity. [0003] Therefore, how to further improve the anti-welding performance of AgNi material to expand its current range has important practical value...

Claims

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Application Information

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IPC IPC(8): C22C5/06C22C32/00C22C1/05H01H1/02
Inventor 陈晓甘可可祁更新陈乐生
Owner WENZHOU HONGFENG ELECTRICAL ALLOY
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