Copper oxide doped silver tin oxide composite and preparation method thereof

Abstract

The invention relates to the technical field of silver-based metal materials, in particular to a low-voltage electric contact material, and particularly discloses a copper oxide doped silver tin oxide composite. The copper oxide doped silver tin oxide composite comprises, by weight, 4.9%-18.5% of tin oxide, 0.1%-1.5% of copper oxide, and the balance silver. A preparation method of the copper oxide doped silver tin oxide composite comprises the steps that a silver-copper composite body is prepared, the silver-copper composite body is mixed with tin oxide powder, then compression forming is conducted, and sintering is conducted. The silver copper composite body comprises silver powder and a copper oxide precursor arranged on the surface of the silver powder in a coating mode. The copper oxide doped silver tin oxide composite has the advantages of being uniform in microstructure, good in processing performance, low in electrical resistivity and the like, is suitable for the electric contact material, and has good stability and long service life. The preparation method of the copper oxide doped silver tin oxide composite has the advantages of being simple, convenient and easy to conduct, high in production efficiency, free of environmental pollution and the like.

Description

technical field [0001] The invention relates to the technical field of silver-based metal materials, in particular to a low-voltage electrical contact material. Background technique [0002] Silver-based electrical contact materials have good electrical conductivity, thermal conductivity and electrical contact performance. They are the core components of low-voltage electrical switches, circuit breakers, and instruments. They are responsible for the on-off of current, and their performance directly affects the normal use of electrical systems. The traditional silver-based electrical contact material is silver-cadmium oxide composite material, which is gradually banned due to the heavy metal cadmium produced during its formation and use. [0003] Silver tin oxide composite material is a kind of Ag as matrix, SnO 2 It is a second-phase metal matrix composite material, which is environmentally friendly and has strong resistance to welding and arc erosion. It is gradually used ...

AI Technical Summary

Problems solved by technology

Both methods have the problem of uneven distribution of copper oxide and tin dioxide in the composite material, especially the low content of copper oxide, whether it can be evenly distributed in the composite material is very important to the improvement of the performance of the material

In the powder metallurgy method, the amount of copper oxide powder is small, and its powder mixing efficiency is low and the uniformity is poor, which is easy to cause uneven microstructure and affect the material performance. If the processing performance is poor, it is easy to appear cracks at the edge of the composite material.

In the internal oxidation method, due to the difficult diffusion of oxygen in the alloy, it often causes uneven oxidation, resulting in poor oxidation zones, and uneven internal structure of the material, which affects the stability and service life of the product.

The uneven distribution of copper oxide and the uneven internal structure of the material lead to the shortcomings of copper oxide doped silver tin oxide electrical contact materials with poor uniformity, poor processability and high resistivity.

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