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Method for preparing in-situ grown carbon nano tube reinforced silver-based electric contact material

A technology of electrical contact materials and carbon nanotubes, which is applied in the coating process of metal materials, contacts, circuits, etc., can solve the problems of many structural defects and uneven dispersion of carbon nanotubes, so as to avoid agglomeration and improve performance. simple effect

Inactive Publication Date: 2014-05-14
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention solves the technical problems of non-uniform dispersion of carbon nanotubes and many structural defects in the commonly used CNTs / Ag composite material preparation method, and provides a preparation method for in-situ growth of carbon nanotubes reinforced silver-based electrical contact materials

Method used

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  • Method for preparing in-situ grown carbon nano tube reinforced silver-based electric contact material
  • Method for preparing in-situ grown carbon nano tube reinforced silver-based electric contact material

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specific Embodiment approach 1

[0018] Specific Embodiment 1: In this embodiment, a method for preparing an in-situ grown carbon nanotube-reinforced silver-based electrical contact material is specifically prepared according to the following steps:

[0019] 1. Mix the silver powder and nickel nitrate hexahydrate, then add ethanol until the concentration of nickel nitrate hexahydrate is 0.1mol / L, then mechanically stir for 25min to 35min, then heat and stir until the ethanol is completely volatilized to obtain Ni(NO 3 ) 2 / Ag composite powder, wherein the mass ratio of nickel nitrate hexahydrate to silver powder is 2% to 10%;

[0020] Two, the Ni(NO) obtained in step one 3 ) 2 / Ag composite powder is evenly spread in the quartz boat, put the quartz boat into the plasma-enhanced chemical vapor deposition equipment, vacuumize to the pressure below 5Pa, and pass H 2 , control H 2 The flow rate is 20sccm, the pressure is kept at 200Pa, and then the temperature is raised to the working temperature of 600℃~800℃...

specific Embodiment approach 2

[0027] Embodiment 2: This embodiment differs from Embodiment 1 in that the purity of the silver powder in Step 1 is above 99% by mass. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0028] Embodiment 3: This embodiment is different from Embodiment 1 in that: in step 1, heat to 200° C. and stir. Others are the same as in the first embodiment.

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Abstract

The invention relates to preparation methods for electric contact materials, in particular to a method for preparing an in-situ grown carbon nano tube reinforced silver-based electric contact material. The method aims to solve the technical problems that when a common CNTs / Ag composite material preparation method is adopted, carbon nano tubes are not dispersed uniformly, and a large number of structural defects exist. The method comprises the steps that firstly, Ni(NO3)2 / Ag composite powder is prepared; secondly, a plasma method is adopted for preparation of the electric contact material. According to the method, since the plasma reinforced chemical vapor deposition method is adopted for low-temperature in-situ growth of the carbon nano tubes, structural perfection and uniform dispersity of the carbon nano tubes in silver powder are guaranteed, clustering of the carbon nano tubes in CNTs / Ag-based electric contact composite powder is avoided, and the improvement on the performance of the CNTs / Ag-based electric contact composite powder by the carbon nano tubes is realized in a true sense. The method is used for preparing the in-situ grown carbon nano tube reinforced silver-based electric contact material.

Description

technical field [0001] The invention relates to a method for preparing an electrical contact material. Background technique [0002] Pure silver has excellent electrical conductivity and stable contact resistance, and is widely used in electrical contact materials with high conductivity and low-to-medium current range. However, the mechanical properties of pure silver are poor, and there are defects such as natural aging softening, transfer and welding under high power load conditions. Therefore, the composite method of materials is often used to significantly improve the hardness, strength, wear resistance and ablation resistance of silver-based materials. [0003] Carbon nanotubes (CNTs) are one of the most widely used materials in nanomaterials. Carbon nanotube is a new type of one-dimensional tubular carbon nanomaterial. Due to its nearly perfect bonding structure, it hinders the entry of impurities and defects, making it have super mechanical properties and chemical s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/26C23C16/513B22F1/00H01H1/023
Inventor 亓钧雷张大磊张丽霞曹健冯吉才
Owner HARBIN INST OF TECH
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