Method for preparing Ag/La1-xSrxCoO3 electric contact composite material

A composite material, electrical contact technology, applied in contacts, circuits, electrical switches, etc., to improve wettability, save silver, and prolong service life

Active Publication Date: 2012-08-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many manufacturers of electrical contact materials in my country, but there is still a big gap between Ag / SnO2 electrical contact materials and foreign countries. In order to meet the needs of national economic development, a new system of environmentally friendly electrical contact materials with excellent comprehensive performance needs to be developed urgently

Method used

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  • Method for preparing Ag/La1-xSrxCoO3 electric contact composite material
  • Method for preparing Ag/La1-xSrxCoO3 electric contact composite material

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Embodiment Construction

[0024] The present invention is further described by examples below.

[0025] The preparation method of the Ag / La1-xSrxCoO3 electrical contact composite material provided by the present invention specifically comprises the following steps:

[0026] (1) Prepare La by sol-gel method 1-x Sr x CoO 3 System conductive ceramic micro-nano powder;

[0027] (2) the above La 1-x Sr x CoO 3 Micro-nano powder and silver powder are mixed evenly in the V-shaped powder mixer, La 1-x Sr x CoO 3 The powder accounts for 8% to 20% of the total mass of the mixed powder;

[0028] (3) The uniformly mixed powder is pressed into a green body by isostatic pressing, then sintered, repressed, and refired in sequence, and finally hot-extruded to obtain Ag / La 1-x Sr x CoO 3 Electrical contact composites.

[0029] The sol-gel method adopted in step (1) prepares La 1-x Sr x CoO 3 The method of conducting conductive ceramic micro-nano powder in the system is: La(NO 3 ) 3, Sr(NO 3 ) 2 , Co...

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Abstract

The invention relates to preparation of an electric contact composite material, and aims to provide a method for preparing an Ag / La1-xSrxCoO3 electric contact material. The method includes preparing conductive ceramic micro-nano-powder of an La1-xSrxCoO3 system by a sol-gel method; uniformly mixing the La1-xSrxCoO3 micro-nano-powder and silver powder in a V-shaped powder mixer, and leading the La1-xSrxCoO3 powder to account for 8-20% of the total mass of mixed powder; and isostatically pressing the uniformly mixed powder into a blank, sequentially realizing sintering, re-pressing and re-sintering processes and finally obtaining the Ag / La1-xSrxCoO3 electric contact composite material by means of thermal extrusion forming. The Ag / La1-xSrxCoO3 electric contact composite material is prepared by the sol-gel method, a wild phase La1-xSrxCoO3 in the composite material is nano-level powder, the melt viscosity in micro-molten pools on the surface of the electric contact material under effects of electric arcs can be improved by the high specific surface area of the wild phase, performances including the electric conductivity, the mechanical strength, the abrasion resistance, the electric arc ablation and the like of the electric contact material are comprehensively enhanced, and the problem of difficulty in processing and forming is avoided.

Description

technical field [0001] The invention relates to a preparation method of a novel electrical contact composite material, specifically, a Ag / La 1-x Sr x CoO 3 Preparation method of electrical contact composite material. Background technique [0002] Electrical contact materials and components are the core components and key materials of electronic industrial equipment such as power switches, electrical appliances, instruments and meters, and are widely used in various fields such as civil, industrial, military, aerospace, aviation, and information. Electrical contact materials and components are mainly responsible for connecting and disconnecting circuits and load currents, and their performance directly affects the reliable operation and life of switching devices. At the same time, the electrical contact material is the key material in the switchgear. The main performance and life of the switchgear depend on the quality of the electrical contact material to a large extent. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C32/00C22C5/06C22C1/10C22C1/05H01H1/0237
Inventor 杨辉贺庆申乾宏乔秀清魏志君邱建美樊先平
Owner ZHEJIANG UNIV
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