Nano diamond doped silver based contact material and its processing method

Abstract

The invention relates to a nanometer diamond intermingled with silver basal contact terminal material and manufacture method thereof. The contact terminal material has a silver nanometer diamond powder coated with surface silver film, wherein the nanometer diamond particle uniformly dispersed in the crystal grain of composite powder. The method of the invention is that the nanometer diamond spreads and dispersed in the silver powder by using high energy ball grinding technique. The function of the high energy ball grinding introduces larger stress into the silver nanometer diamond powder, thus providing high spreading activity for silver atom. Then, part of the silver atom spreads to the border of the composite powder by low temperature annealing, thereby solving technical trouble of reunion and offsetting union of the nanometer diamond. At the same time, the material obtains good process plasticity by using the powder structure of high plastic silver film.

Description

technical field [0001] The invention belongs to the field of novel electrical functional materials, and in particular relates to a nano-diamond-doped silver-based contact material and a processing method thereof. Background technique [0002] The contact is the core component of the electric control switch, which is responsible for the conduction and disconnection of the circuit. The greater the load current, the more the contact material will be burned. The on-off of contact materials is the main basic action of all electrical equipment. Therefore, the research, development and production of high-performance contact materials are a key link to improve the level of the entire electrical industry. [0003] At present, the contact materials used in low-voltage switchgear are mainly silver-based materials, which are divided into silver oxide (AgMeO), silver nickel (AgNi), silver graphite (AgC), etc. The annual domestic market consumption exceeds 10 billion yuan / year. Among t...

AI Technical Summary

Problems solved by technology

[0011] However, diamond is the hardest material, adding it to silver alloy as an additive will significantly increase the hardness of the material, but at the same time it will significantly affect the plastic deformation ability of the material

In particular, when the diamond is significantly refined into nanodiamonds of extremely small size, the nanodiamond particles tend to agglomerate due to the effect of surface energy, and are easy to segregate at the boundary of silver powder, so that the material cannot be mechanically deformed or has only extremely Small plastic deformation ability, unable to withstand conventional rolling, drawing or riveting processes, so that it is difficult to process the material into the required wire, plate, and rivet-shaped contacts, so industrial production cannot be realized