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Preparation method of superfine high-diffusion silver-tungsten electric contact material

An electrical contact material, silver-tungsten technology, which is applied in the field of preparation of ultra-fine and high-dispersion silver-tungsten electrical contact materials, can solve the problem of large internal pore size, does not involve the preparation method of ultra-fine and high-dispersion silver-tungsten electrical contact materials, and cannot obtain ultra-fine Dispersed structure and other problems, to achieve the effect of reducing melting, high and reliable arc burnout performance, and improving contact conductivity

Active Publication Date: 2018-03-13
ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The foamed metal skeleton structure in the patent is mainly used as a structural part of the reinforcement layer support body, and its function is equivalent to that of the foamed ceramic skeleton; the internal pore diameter is large, and the functional effect of ultrafine dispersed tissue cannot be obtained
[0006] None of the above inventions relates to a method for preparing an ultra-fine highly dispersed silver-tungsten electrical contact material with high and stable resistance to arc burnout

Method used

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  • Preparation method of superfine high-diffusion silver-tungsten electric contact material
  • Preparation method of superfine high-diffusion silver-tungsten electric contact material
  • Preparation method of superfine high-diffusion silver-tungsten electric contact material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Taking the preparation of AgW50 material as an example

[0025] 1) Premix spherical tungsten foam powder and activating elements (Be, Ti, Nb) at a ratio of 99.3:0.2:0.3:0.2 for 2 hours; spherical tungsten foam powder has a particle size of 2um, a pore size of 0.1-0.5um, and a porosity of 90 %;

[0026] 2) Mix the premixed powder and silver powder at a ratio of 65:35 for 6 hours to obtain a mixed powder;

[0027] 3) Press the mixed powder into a skeleton with a porosity of 35%;

[0028] 4) The skeleton is exhausted in a vacuum sintering furnace under a vacuum atmosphere of 100Pa at 800°C for 2 hours;

[0029] 5) Put the rest of the weight of the silver sheet on the frame, and infiltrate it in a hydrogen atmosphere at 1300°C for 0.5 hours.

[0030]

Embodiment 2

[0032] Taking the preparation of AgW55 material as an example

[0033] 1) Premix spherical tungsten foam powder and activating elements (Ta, Ti, Ni-P) at a ratio of 99.1:0.3:0.5:0.1 for 1 hour; rate 85%;

[0034] 2) Mix the premixed powder and silver powder at a ratio of 70:30 for 7 hours to obtain a mixed powder;

[0035] 3) Press the mixed powder into a skeleton with a porosity of 38%;

[0036] 4) The skeleton is exhausted in a vacuum sintering furnace under a vacuum atmosphere of 80Pa at 750°C for 1.5 hours;

[0037] 5) Put the remaining weight of the silver sheet on the frame, and infiltrate it at 1200° C. for 1 hour in a hydrogen atmosphere.

[0038]

Embodiment 3

[0040] Taking the preparation of AgW60 material as an example

[0041] 1) Premix spherical tungsten foam powder and activating elements (Al, Li, Nb) at a ratio of 99.5:0.1:0.3:0.1 for 1 hour; spherical tungsten foam powder has a particle size of 3um, a pore size of 0.2-0.6um, and a porosity of 95 %;

[0042] 2) Mix the premixed powder and silver powder at a ratio of 75:25 for 6 hours to obtain a mixed powder;

[0043] 3) Press the mixed powder into a skeleton with 42% porosity;

[0044] 4) The skeleton is degassed in a vacuum sintering furnace under a vacuum atmosphere of 50Pa at 700°C for 4 hours;

[0045] 5) Put the remaining weight of the silver sheet on the frame, and infiltrate it at 1000° C. for 2 hours in a hydrogen atmosphere.

[0046]

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Abstract

The invention discloses a preparation method of a superfine high-diffusion silver-tungsten electric contact material. Spherical foam tungsten powder and activating elements are premixed and then mixedwith a part of silver powder into framework powder, the framework powder is primarily pressed into a framework with certain porosity, vacuum sintering is conducted, then silvering is conducted, and compact superfine high-diffusion silver-tungsten alloy is obtained. According to the prepared high-uniformity silver-tungsten electric contact material, two phases of matrix silver and high-melting-point tungsten are fine in grain and are distributed in a mutually diffusing mode, components and shapes in all micro-area range of contact surfaces in the arc erosion process change slightly, and thus the high and reliable arc erosion resistance is achieved. The superfine high-diffusion silver-tungsten electric contact material is simple in process and suitable for mass production, and prepared products can be widely applied to circuit breakers and contactors.

Description

technical field [0001] The invention belongs to the field of electrical contact materials, in particular to a preparation method of an ultrafine highly dispersed silver-tungsten electrical contact material. Background technique [0002] Arc burning is essentially the thermal-mechanical effect of arc energy on the contact material. Physical metallurgical processes such as heating, melting, gasification, flow, and solidification occur on the contact surface, resulting in softening, splashing, and flow on the contact surface. , cracks, etc. Improving the electrical performance of contacts requires materials to delay or reduce the occurrence of the above physical metallurgical processes through the optimized design and preparation of components and structures. [0003] Due to the tungsten agglomeration phenomenon in the traditional silver-tungsten electrical contact material, the silver cannot penetrate completely and cause holes. Due to the poor bonding strength, the aggregat...

Claims

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Application Information

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IPC IPC(8): C22C5/06C22C1/04B22F1/00B22F3/10
CPCC22C1/0466C22C5/06B22F3/1007B22F3/1035B22F2998/10B22F2999/00B22F1/09B22F2201/20B22F3/11
Inventor 张秀芳万岱王珩杨昌麟李杰颜小芳黄文明黄钟柏小平林万焕
Owner ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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