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

A technology of organizational structure and oxide electricity, applied in contacts, circuits, electric switches, etc., can solve problems such as the existence of large particles, complex processes, and difficulties in large-scale production

Active Publication Date: 2012-08-22
WENZHOU HONGFENG ELECTRICAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fibrous structure prepared by this method is not obvious, so it is not suitable for the reinforcement phase with poor plasticity and ductility, and there will be large particles of the reinforcement phase, which will affect the performance of the product
The second is the method of combining the pre-design of the green body with the extrusion method, that is, a certain number of reinforced phase wires are fixed in the matrix with a mold in advance, and then isostatic pressing, sintering and extrusion [document CN101707145A], this method Although an obvious and continuous fibrous structure can be obtained, the process is relatively complicated. The silver-based filaments containing the reinforcing phase must be prepared in advance and fixed in the matrix with a mold, and there are requirements for the plasticity and ductility of the reinforcing phase filaments. Scale production is more difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] to prepare AgSnO 2 (10) Contact material as an example

[0035] In the first step, 300g of Ag ingot, 600g of Sn ingot and 70g of In additive are placed in a melting furnace for smelting, and then the alloy liquid is atomized and powdered.

[0036]In the second step, the alloy powder obtained in the first step is placed in a high-energy ball mill tank for ball milling, the ball milling speed is 300 rpm; the ball milling time is 10 hours; the ball-to-material ratio is 10.

[0037] In the third step, the ball-milled powder obtained in the second step is subjected to internal oxidation, the oxidation temperature is 700° C., the oxidation time is 5 hours, and the oxygen pressure is 1.5 MPa.

[0038] In the fourth step, the internally oxidized powder obtained in the third step is ball milled and granulated and sieved in turn, and the large particles that fail to pass through the sieve are returned to the ball mill for reprocessing, and then sieved. The ball milling speed is...

Embodiment 2

[0046] Taking the preparation of AgCdO12 contact material as an example

[0047] In the first step, 300g of Ag ingot, 300g of Cd ingot and 15g of Cu additive are placed in a melting furnace for smelting, and then the alloy liquid is atomized and powdered.

[0048] In the second step, the alloy powder obtained in the first step is placed in a high-energy ball mill tank for ball milling, the ball milling speed is 180 rpm; the ball milling time is 10 hours; the ball-to-material ratio is 12.

[0049] In the third step, the ball-milled powder obtained in the second step is subjected to internal oxidation, the oxidation temperature is 300° C., the oxidation time is 15 hours, and the oxygen pressure is 0.3 MPa.

[0050] In the fourth step, the internally oxidized powder obtained in the third step is ball milled and granulated and sieved in turn, and the large particles that fail to pass through the sieve are returned to the ball mill for reprocessing, and then sieved. The ball milli...

Embodiment 3

[0058] Taking the preparation of AgZnO(8) contact material as an example

[0059] In the first step, 600g of Ag ingot, 200g of Zn ingot and 18g of Bi additive are placed in a smelting furnace for smelting, and then the alloy liquid is atomized and powdered.

[0060] In the second step, the alloy powder obtained in the first step is placed in a high-energy ball mill tank for ball milling, the ball milling speed is 300 rpm; the ball milling time is 5 hours; the ball-to-material ratio is 15.

[0061] In the third step, the ball-milled powder obtained in the second step is subjected to internal oxidation, the oxidation temperature is 500° C., the oxidation time is 12 hours, and the oxygen pressure is 0.5 MPa.

[0062] In the fourth step, the internally oxidized powder obtained in the third step is ball milled and granulated and sieved in turn, and the large particles that fail to pass through the sieve are returned to the ball mill for reprocessing, and then sieved. The ball mill...

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Abstract

The invention discloses a method for preparing a silver-based oxide electrical contact material with a fibrous structure, which comprises the following steps of: 1, smelting a silver ingot, a metal ingot and an additive in a smelting furnace to form alloy liquid, and performing atomization comminuting; 2, performing high energy ball milling; 3, performing internal oxidation; 4, performing high energy ball milling granulation and sieving; 5, pouring ball milling granulated and sieved powder and a substrate into a powder mixer for powder mixing; 6, performing cold isostatic pressing; 7, performing sintering; 8, performing hot pressing; and 9, performing hot extrusion. In the method, regardless of the magnitude of machining deformation, the silver-based oxide electrical contact material withthe remarkable fibrous structure can be obtained; the plasticity and ductility of a wild phase are not required; the method is simple and convenient to operate; equipment is not required specially; and simultaneously, the wild phase is not required to be externally purchased, so the production cost is greatly saved. The material prepared by the method has greatly improved resistance to fusion welding, greatly improved arc ablation resistance, greatly improved electric conductivity and high machinability.

Description

technical field [0001] The invention relates to a preparation method of an electric contact material, in particular to a preparation method of a fibrous tissue structure silver-based oxide electric contact material. Background technique [0002] With the development of high-voltage transmission and transformation grids with large capacity and ultra-high voltage, the low-voltage power distribution system and control system have higher requirements for automation and sensitivity, and the modernization of electronic industrial products has put forward higher and higher functions for electrical contacts. requirements and long-life use requirements. For this reason, new silver-based composite materials and preparation processes are constantly being developed. Silver-based oxide composites with fibrous structure have become a research hotspot in recent years because of their excellent welding resistance, arc ablation resistance and good processing performance. At present, the pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C5/06C22C47/00C22C49/02C22C49/14C22C1/04H01H1/0237
CPCC22C1/1078H01H1/0237B22F9/08H01H1/02376C22C5/06C22C32/0015B22F3/14H01H1/02374H01H1/02372B22F3/20B22F3/04C22C32/0021C22C1/1084
Inventor 陈乐生陈晓祁更新穆成法
Owner WENZHOU HONGFENG ELECTRICAL ALLOY