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Preparation method of silver metal oxide electrical contact material

A technology of oxide electrical and contact materials, applied in the field of low-voltage electrical contact materials, can solve the problems that AgMeO electrical contact materials are not as good as possible, not suitable for mass production line production, and the contact size is not accurate enough. Market prospects, reducing labor intensity and labor costs, and the effect of uniform organizational structure

Active Publication Date: 2016-06-22
KUNMING UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

However, the AgMeO electrical contact materials prepared by these methods are not as good as people's expectations.
The surface and internal structure of the AgMeO electrical contact material prepared by the alloy internal oxidation method is uneven, there is a poor oxide layer in the middle, and the contact size is not accurate enough. In addition, this production process is not suitable for the production of wire rods; the AgMeO electrical contact material prepared by the powder sintering method The density of the head material is low, the oxidized particles are thicker, and the arc corrosion resistance is poor; the AgMeO electrical contact material prepared by the in-situ reaction synthesis process has better performance, but the cost is too high, it is not suitable for mass production line production, and it is difficult to satisfy the market needs

Method used

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  • Preparation method of silver metal oxide electrical contact material

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Experimental program
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Effect test

Embodiment 1

[0023] Such as figure 1 According to the process flow, the AgZn alloy powder with a particle size of 2000nm (containing 9.87% Zn, mass percentage) is oxidized in a self-made oxygen positive pressure oxidation furnace under the conditions of a positive oxygen pressure of 2 standard atmospheres, a temperature of 300 ° C, and a heat preservation of 20 hours. Oxidation reaction was carried out in the medium to obtain AgZnO powder with a ZnO content of 12% (mass percentage); after weighing, put them into square molds respectively, and perform compression molding to obtain AgZnO biscuits (pressing temperature was 100°C and pressing pressure was 500MPa); Then the blank is heated by electric induction. When the temperature reaches 900°C, it is stamped under the stamping pressure of 300MPa to obtain the finished product of AgZnO electrical contact material with a ZnO content of 12% (mass percentage).

Embodiment 2

[0025] Such as figure 1 The process flow is to oxidize the AgSn alloy powder with a particle size of 1000nm (containing 8.05% Sn, mass percentage) under the condition of a positive oxygen pressure of 3 standard atmospheres, a temperature of 600 ° C, and a temperature of 15 hours. Oxidation reaction in the furnace to obtain SnO 2 AgSnO with a content of 10% (mass percentage) 2 powder. After measuring and weighing, put them into square molds respectively, and perform compression molding to obtain AgSnO 2 Bisque (pressing temperature is 600°C, pressing pressure is 200MPa). Then the biscuit is heated by electric induction. When the temperature reaches 700°C, it is stamped under the stamping pressure of 900MPa to obtain SnO 2 AgSnO with a content of 10% (mass percentage) 2 finished electrical contact material.

Embodiment 3

[0027] Such as figure 1 According to the technological process, the AgSnCu alloy powder with a particle size of 700nm (containing 6.52% Sn, containing 6.61% Cu, mass percentage) is used under the condition of positive oxygen pressure of 4 standard atmospheres, temperature of 400 ° C, and heat preservation for 5 hours. Oxidation reaction was carried out in a self-made oxygen positive pressure oxidation furnace to obtain 2 AgSnO with 8 mass percent and 8 mass percent CuO 2 CuO powder. After measuring and weighing, put them into circular molds respectively, and carry out compression molding to obtain AgSnO 2 CuO biscuit (pressing temperature is 500°C, pressing pressure is 600MPa). Then the green body is heated by electric induction. When the temperature reaches 850°C, it is stamped under the condition of stamping pressure of 600MPa to obtain SnO 2 and AgSnO with CuO content of 8% and 8% (mass percent), respectively 2 Finished CuO electrical contact material.

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Abstract

The invention discloses a preparation method of a silver metal oxide electrical contact material and belongs to the technical field of electrical contact materials for low-voltage apparatuses. The preparation method comprises the following steps: carrying out oxygen positive pressure oxidizing reaction on silver metal alloy (AgMe) powder with nano and micron particle sizes to produce silver metal oxide (AgMeO) powder, and then adopting a near-net forming technology to produce a finial silver metal oxide electrical contact material. The preparation method has the advantages of short production period, simpleness in process, no raw material waste, and no needs for powder mixing and processes of extrusion, draw forming and the like; further, the technology is easy in establishing a full-automatic production line and is suitable for the requirements for industry 4.0; and in addition, the obtained silver metal oxide electrical contact material is uniform in tissue, high in density and good in wear and arc erosion resistances.

Description

technical field [0001] The invention relates to a method for preparing a silver metal oxide electrical contact material, which uses a near net shape technology to prepare a silver metal oxide (AgMeO) electrical contact material, and belongs to the technical field of low-voltage electrical contact material. Background technique [0002] Near-net shape technology refers to the forming technology of mechanical components that can be used as a mechanical component with only a small amount of processing or no processing after the part is formed. It makes the formed mechanical components have precise shape, high dimensional accuracy, shape and position accuracy and good surface roughness. And it is a comprehensive integration technology of new technology, new equipment, new materials and various new technology achievements. [0003] Low-voltage electrical contact materials have a history of more than 100 years. Among them, the silver-based electrical contact material is suitable...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C5/06C22C32/00
CPCC22C1/05C22C5/06C22C32/001
Inventor 周晓龙胡日茗曹建春
Owner KUNMING UNIV OF SCI & TECH
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