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Method for preparing silver-based electrical contact material with fibrous structure

An electric contact material, fibrous technology, applied in the field of preparation of fibrous structure silver-based electrical contact materials, can solve the problem of difficulty in obtaining fibrous structure silver-based materials, difficulties in large-scale production, poor plasticity and ductility, and equal reinforcement question

Active Publication Date: 2011-04-06
WENZHOU HONGFENG ELECTRICAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is difficult to obtain silver-based materials with a fibrous structure when the amount of processing deformation is small, such as extrusion into a plate or sheet; and this method is not suitable for reinforcing phases with poor plasticity and ductility, such as SnO 2
The third is the method of combining the pre-design of the green body with the extrusion method, that is, a certain number of reinforcement phase wires are fixed in the matrix with a mold in advance, and then isostatic pressing, sintering and extrusion [Document 2)]. Although the method can obtain an obvious and continuous fibrous structure, the process is relatively complicated. It is necessary to pre-prepare the silver-based wire material containing the reinforcement phase and fix it in the matrix with a mold. It is difficult to scale production, and the requirements for the reinforcement phase wire material Has a certain amount of plasticity and ductility

Method used

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  • Method for preparing silver-based electrical contact material with fibrous structure
  • Method for preparing silver-based electrical contact material with fibrous structure
  • Method for preparing silver-based electrical contact material with fibrous structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] combine figure 1 and figure 2 , to prepare AgSnO 2 (12) Contact material as an example

[0035] The first step is to obtain matrix Ag powder with a particle size of 200 mesh. The silver is subjected to three-stage atomization treatment, and the atomized silver powder is passed through a 200-mesh sieve.

[0036] In the second step, the enhancement phase SnO 2 Powder (average particle size 80nm) 600g and Ag powder 400g obtained in the first step are uniformly mixed, then placed in a high-energy ball mill tank and carried out ball milling, ball milling speed 280 rev / min, ball milling time 10 hours, prepare the scanning electron micrograph of composite powder Such as figure 1 shown.

[0037] In the third step, pour 1Kg of the composite powder obtained in the second step and 4Kg of the silver powder obtained in the first step into a "V" type powder mixer for uniform powder mixing. When mixing powder, the rotating speed is 30 rpm, and the time is 4 hours.

[0038] Th...

Embodiment 2

[0044] Taking the preparation of AgCdO12 contact material as an example

[0045] In the first step, 600 g of CdO powder (average particle size of 1 μm) and 200 g of Ag powder with a particle size of 400 mesh are uniformly mixed, and then placed in a high-energy ball mill tank for ball milling at a ball milling speed of 240 rpm and a ball milling time of 10 hours.

[0046] In the second step, 800 g of the composite powder obtained in the first step and 4200 g of silver powder with a particle size of 400 mesh are poured into a "V" type powder mixing machine for uniform powder mixing. When mixing powder, the rotating speed is 25 rpm, and the time is 4 hours.

[0047] In the third step, put the powder obtained in the second step into a plastic cylinder with a diameter of 90 cm and a length of 150 cm, and perform cold isostatic pressing with a pressure of 300 MPa.

[0048] In the fourth step, the cold isostatic pressed green body obtained in the third step is sintered at a sinteri...

Embodiment 3

[0053] Taking the preparation of AgZnO(8) contact material as an example

[0054] In the first step, 400 g of the reinforcement phase ZnO powder (average particle size 100 nm) and 800 g of Ag powder with a particle size of 400 mesh are uniformly mixed, and then placed in a high-energy ball mill tank for ball milling, the ball milling speed is 240 rpm, and the ball milling time is 5 hours.

[0055] In the second step, 1200 g of the composite powder obtained in the first step and 3800 g of silver powder with a particle size of 600 mesh are poured into a "V" type powder mixing machine for uniform powder mixing. When mixing powder, the rotating speed is 30 rpm, and the time is 4 hours.

[0056] In the third step, put the powder obtained in the second step into a plastic cylinder with a diameter of 90 cm and a length of 150 cm, and perform cold isostatic pressing with a pressure of 100 MPa.

[0057] In the fourth step, the cold isostatic pressed green body obtained in the third st...

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Abstract

The invention discloses a method for preparing a silver-based electrical contact material with a fibrous structure, which comprises the following steps: 1, uniformly mixing reinforcing-phase material powder with substrate silver powder uniformly, and ball milling; 2, feeding the obtained mixed powder and substrate silver powder into a powder mixer for mixing powder; 3, performing isostatic cool pressing; 4, sintering; 5, performing hot pressing; and 6, performing hot extrusion and obtaining the silver-based electrical contact material. The method of the invention can prepare the sliver-based electrical contact material with an obvious fibrous structure regardless the processing deformation amount and the levels of the plasticity and ductility of a reinforcing phase; and in the method, theprocess is simple, it is convenient to operate, the cost is low, and special requirements on equipment are avoided. The fusion welding resistance, arc erosion resistance and conductivity of the material prepared by the method are all improved greatly, and the processing performance of the material is high.

Description

technical field [0001] The invention relates to a method for preparing an electrical contact material in the field of material technology, in particular to a method for preparing a silver-based electrical contact material with a fibrous structure. Background technique [0002] With the rapid development of the electrical industry, the application of electrical switches has increasingly high requirements for the performance of electrical contact materials. High resistance to fusion welding, high arc ablation resistance and excellent electrical conductivity are required. In response to the above requirements, researchers at home and abroad have done a lot of work, mainly to improve the performance from the design of material components and the uniformity of dispersion of the reinforced phase. Compared with ordinary particle dispersion reinforced silver-based composites, fibrous structure particle-reinforced silver-based composites have better welding resistance, arc ablation ...

Claims

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Application Information

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IPC IPC(8): C22C47/14C22C49/02H01H1/023
CPCC22C1/1094C22C5/06B22F2998/10H01H1/023C22C47/14C22C1/1084C22C32/0021B22F1/12B22F1/18B22F3/06B22F3/10B22F2003/145B22F2003/208B22F1/09
Inventor 陈乐生陈晓祁更新穆成法
Owner WENZHOU HONGFENG ELECTRICAL ALLOY
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