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Preparation method of silver metal oxide electric contact material

A technology of oxide electrical and contact materials, applied in the direction of contact materials, etc., can solve the problems of complex oxide mixture procedures, difficult processing, uneven powder mixing in powder metallurgy, etc., to reduce the size of powder grains and improve processing Performance and production cost reduction effects

Inactive Publication Date: 2005-12-07
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the process of preparing the oxide mixture by this method is complicated, and there are still problems of uneven powder mixing and subsequent processing difficulty in conventional powder metallurgy technology.

Method used

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  • Preparation method of silver metal oxide electric contact material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Mix 92wt% Ag powder with 8wt% Cu powder evenly, see figure 1 Curve a. The mixed powder is high-energy ball milled for 6 hours. At this time, Cu is completely dissolved in Ag to form ultra-fine Ag-Cu alloy powder (curve b); the powder after ball milling is vacuum pre-annealed at 200-350°C and then cooled at 450-600°C Oxidation in air produces a powder of CuO particles in which the oxide is dispersed in the Ag matrix (curve c); the oxidized powder is thermally processed to prepare AgCuO10 contacts (curve d).

Embodiment 2

[0024] The mixed powder containing 8wt% of Cu powder and the rest of Ag powder is subjected to high-energy ball milling (high-energy ball milling can be carried out in vacuum, argon or air, and ball milling takes 2-8 hours) to obtain Ag-Cu alloy powder. The ball-milled powder is pre-annealed in vacuum at 200-350°C, and then cold-pressed, sintered, rolled, wire-drawn, and beaten into rivets. The rivet contacts were internally oxidized at 700°C to produce AgCuO10 contacts.

Embodiment 3

[0026] The mixed powder of Ag powder and 10-20% Sn powder with a weight ratio of 80-90%, respectively, is high-energy ball milled in a low-oxygen atmosphere for 2-10 hours to obtain Ag-Sn binary alloy powder, and the ball-milled powder is in Oxidation treatment at 400-650°C produces diffusely distributed SnO in the silver matrix 2 Particles, SnO 2 The particle size is not greater than 5 μm. AgSnO was prepared by cold pressing, sintering, and hot repressing the internally oxidized powder. 2 contacts.

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Abstract

The preparation method of silver metal oxide electric contact material is characterized by that it adopts high-energy ball-grinding process to prepare silver-containing alloyed or intermetallic compound or obviously-fined powder, then utilizes the processes of internal oxidation and forming treatment so as to obtain the invented electric contact. It utilizes the control of partial pressure and temp. of oxygen in the course of internal oxidation of can obtain dispersed distribution of nano-grade or micrometer-grade metal oxide in silver base body. There is a self-formed interface between the oxide and silver base body.

Description

Technical field: [0001] The invention belongs to the field of electrical functional materials, and relates to a manufacturing method of a silver-based electrical contact material. Background technique: [0002] Electrical contact material is the core component and key material of electric power and electronic devices. It undertakes the task of connecting and disconnecting the circuit and load current, and determines the breaking ability and contact reliability of the switch. At present, silver cadmium oxide (AgCdO) alloy is mainly used in medium and low voltage electrical contacts. However, AgCdO alloys release toxic vapors during production and use, which poses serious environmental pollution problems. Moreover, as electrical switches put forward strict performance requirements such as miniaturization, high reliability, and long life for electrical contacts, AgCdO alloys have shown shortcomings in performance indicators such as welding resistance and arc erosion resistance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C5/06H01H1/02
Inventor 王亚平田涛卢柯
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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