Method for preparing compound electrical contact material

Abstract

The invention discloses a method for preparing a compound electrical contact material. The technical process comprises the following steps of: (1) preparing a catalyst precursor, preparing a Ni-based catalyst from a mixed aqueous solution of hexahydrated nickel nitrate and hexahydrated yttrium nitrate, and depositing on a sample copper sheet which is subjected to plasma treatment and washed to obtain a catalyst precursor, wherein the mass ratio of nickel to yttrium is 1-10; (2) preparing a CNTs (Carbon Nanotube) array, putting the catalyst precursor into a quartz boat, undergoing a decomposition reaction under the protection of argon gas, and undergoing a catalytic pyrolysis reaction to obtain a sample copper sheet on which a CNTs array grows; and (3) preparing a CNTs-Ag-Cu compound electrical contact material, adding a silver nitrate aqueous solution into the sample copper sheet on which the CNTs array grows, soaking the silver nitrate aqueous solution into the CNTs array of the sampler copper sheet under the low ultrasonic action, evaporating and decomposing repeatedly for 3-20 times for 0.2-3 hours every time till the CNTs array is fully filled.

Description

technical field [0001] The invention relates to electrical contact material technology, in particular to a method for preparing an electrical contact material in which carbon nanotubes are directly grown on a copper substrate, and the surface of the Cu substrate is covered with a CNT-Ag composite layer by dipping or other processes. Background technique [0002] The material of electrical contacts is a key factor affecting the reliability of the contact system of switching appliances. For a long time, silver-based alloys and silver metal oxides have been the main materials for the preparation of electrical contacts for low-voltage electrical appliances. Among them, AgCdO is called "universal contact", which is the first choice for electrical contacts or electrical contact materials with the best comprehensive performance, but the impact of "cadmium poisoning" on the environment has attracted people's attention. An important part of the research and development of silver-bas...

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Problems solved by technology

Recently, Nessim et al. used Fe as the catalyst, preheated the feed gas at high temperature, and placed the substrate in the low temperature area to grow CNTs directly on the Ta substrate. In this process, temperature control is the key. Keeping the substrate at a low temperature can reduce the metal matrix The reaction with the catalyst, but the specific mechanism of action between the conductive substrate and the catalyst and the influence on the growth of the CNTs array are still unclear, and the process is complicated

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