Composite powder of stannic oxide Nano crystal with silver being covered

Abstract

A silver covered tin oxide nanocrystal is prepared through preparing nanocrystals of tin oxide (13 nm), coating a silver layer on the surface of each nonocrystal, and atomic diffusion. Its advantage is high performance is density, hardness, resistivity and electric conductivity.

Description

technical field [0001] The invention relates to a silver-coated tin oxide nanocrystalline composite powder and a preparation method thereof, belonging to electrical contact metal materials and the manufacturing technology thereof. Background technique [0002] Silver tin oxide prepared by powder metallurgy process is superior to other contact materials when used in low-voltage electrical contact contact materials. It is generally believed that the electrical properties of silver tin oxide materials are equivalent to those of silver cadmium oxide materials with a large amount, but they have better anti-welding and arc corrosion resistance properties, and are a new ideal contact material. [0003] However, the disadvantages of silver tin oxide materials are: large contact resistance, high temperature rise, high material hardness, and difficult processing. Therefore, it has become a research topic to replace the larger amount of silver cadmium oxide with silver tin oxide. [...

AI Technical Summary

Problems solved by technology

[0003] However, the disadvantages of silver tin oxide materials are: large contact resistance, high temperature rise, high material hardness, and difficult processing

Although the metal and additive composite powder obtained by this method is better than the metal mixed powder prepared by mechanical mixing, the particles are still relatively coarse, and the comprehensive performance of the material is still not high.

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