Contact of nanomaterials

Release time：

2022-10-31 09:47

With the development of high voltage, high current, miniaturization and long life of switching devices, the electrical properties of contact materials are required to be higher and higher. Nanometer contact materials have become a hot spot in the research and preparation of contact materials.
The research of most nano bulk contact materials is still in the laboratory research stage, and there are still many problems to be solved in practical applications. The main reasons are:

(1) The application of nanostructures in bulk materials is much more difficult than that of low dimensional materials. Not only is the theoretical analysis more complex than low dimensional nanomaterials, but also the controllable preparation of nanostructured bulk materials is a complex preparation science and technology problem. The prepared nano contact materials generally have high gas content, low density and other defects, which hinder the improvement of electrical properties of nano contact materials.
(2) The research on the electrical properties of nano contact materials is not deep and comprehensive enough. Due to different applications, contact materials have different requirements for electrical performance. For example, for high pressure vacuum contact materials, low cut-off values, high compressive strength and high breaking capacity are required. For contact materials of low-voltage switches, low cut-off value, good resistance to arc ablation and fusion welding are required.

(3) For the development of nanomaterials, most rely on the experience of developers, and use a large number of destructive type testing and screening methods, lacking theoretical guidance. The research on the relationship between particle size and composition, electrical parameters and thermal parameters of nano contact materials is not deep enough. Compared with traditional contact materials, nano contact materials have lower melting point, higher specific heat capacity and lower thermal conductivity. In order to comprehensively evaluate the electrical properties of nano contact materials, reduce the development cost and shorten the development cycle, it is necessary to strengthen the theoretical research of nano materials.

nanometer material

Type of contact

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Type of contact

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Disconnectable contacts are an indispensable part of switching appliances. According to their different structures, they can be divided into the following types: (1) Knife contact: it has a simple structure and can be divided into surface contact and line contact, which are widely used in low-voltage switches and high-voltage disconnectors. (2) Butt joint contact: It has the characteristics of simple structure and fast action, but the contact surface is unstable and varies greatly with the pressure. It is easy to rebound during operation, without self-cleaning effect, and the contact is easy to be burned by electric arc. This contact is usually used for distribution circuit breakers with rated currents below 1000 A and below 500 A

Switching capacity of electric contact

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