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Method for preparing silver carbon nanotube and lanthanum zirconate composite electric contact material

A technology of electrical contact materials and carbon nanotubes, applied in contacts, circuits, electric switches, etc., can solve the problems of difficult plastic processing, brittle fracture, plasticity and strength of materials that need to be further improved, and improve plastic processing and performance. Effect of stabilizing and improving plastic workability and electrical conductivity

Active Publication Date: 2016-09-28
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Silver-based electrical contact materials perform well in various mechanical and electrical properties, but the process improvement technology that further reduces the cost of silver (silver content ≤ 88wt.%) will lead to the problem that silver-based electrical contact materials are difficult to plastically process. It is prone to brittle fracture, and the plasticity and strength need to be further improved

Method used

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  • Method for preparing silver carbon nanotube and lanthanum zirconate composite electric contact material

Examples

Experimental program
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Effect test

specific Embodiment 1

[0028] (1) Proportionally weigh zirconium nitrate and lanthanum nitrate with a molar ratio of 1:1 as raw materials, add to deionized water to dissolve completely, then move to a volumetric flask to constant volume, and configure a total concentration of 0.5mol / L Colorless transparent solution;

[0029] (2) Press n(Zr 4+ +La 3+ ):n (citric acid) molar ratio is 1:1.5 Weigh corresponding citric acid, add in the above-mentioned transparent solution, add the ammonia solution of mass concentration 25%~28% in the mixed solution, adjust pH to 7, and Continue magnetic stirring at room temperature for 3 hours; then settle for 24 hours, remove the supernatant, and dry at 80°C to obtain powder;

[0030] (3) Grinding the dried powder, passing through a 200-mesh sieve, and sintering at 900° C. for 5 hours to obtain the corresponding nano-powder of lanthanum zirconate;

[0031] (4) Using lanthanum zirconate nanopowder, carbon nanotube powder and silver powder as raw materials, according t...

specific Embodiment 2

[0034] (1) Proportionally weigh zirconium nitrate and lanthanum nitrate with a molar ratio of 1:1 as raw materials, add to deionized water to dissolve completely, then move to a volumetric flask to constant volume, and configure a total concentration of 0.5mol / L Colorless transparent solution;

[0035] (2) Press n(Zr 4+ +La 3+ ): n (citric acid) molar ratio is 1:1.5 Weigh corresponding citric acid, add in the above-mentioned transparent solution, dropwise add the ammonia solution of mass concentration 25%~28% in the mixed solution, adjust pH to 8, and Continue magnetic stirring at room temperature for 3 hours; then settle for 24 hours, remove the supernatant, and dry at 80°C to obtain powder;

[0036] (3) Grinding the dried powder, passing through a 200-mesh sieve, and sintering at 1000° C. for 4 hours to obtain the corresponding nano-powder of lanthanum zirconate;

[0037] (4) With lanthanum zirconate nanopowder, carbon nanotube powder and silver powder, according to 14wt....

specific Embodiment 3

[0040] (1) Proportionally weigh zirconium nitrate and lanthanum nitrate with a molar ratio of 1:1 as raw materials, add to deionized water to dissolve completely, then move to a volumetric flask to constant volume, and configure a total concentration of 0.5mol / L Colorless transparent solution;

[0041](2) Weigh the corresponding citric acid according to the n(Zr4++La3+):n(citric acid) molar ratio of 1:1.5, add it to the above transparent solution, and add dropwise to the mixed solution with a mass concentration of 25% to 28% ammonia solution, adjust the pH to 9, and continue magnetic stirring at room temperature for 3 hours; then settle for 24 hours, remove the supernatant, and dry at 80°C to obtain a powder;

[0042] (3) Grinding the dried powder, passing through a 200-mesh sieve, and sintering at 1200° C. for 3 hours to obtain the corresponding nano-powder of lanthanum zirconate;

[0043] (4) With lanthanum zirconate nanopowder, carbon nanotube powder and silver powder, acc...

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Abstract

The invention relates to the material preparation technology of electronic components, and aims to provide a method for preparing a silver carbon nanotube and lanthanum zirconate composite electric contact material. The method comprises the following steps: taking zirconium nitrate and lanthanum nitrate which have the equal molar ratio, and preparing a mixed solution with deionized water; adjusting the pH value with an ammonia water solution after adding citric acid, and settling and drying to obtain powder after stirring; grinding, sieving and sintering to obtain lanthanum zirconate nano-powder; matching and mixing lanthanum zirconate nano-powder, carbon nanotube powder and silver powder; drying and sieving after ball milling to obtain composite powder of a silver-based electric contact material; performing hot-press molding to obtain briquets; and performing hot extrusion treatment on the briquets to obtain the molded silver carbon nanotube and lanthanum zirconate composite electric contact material. The method is simple in synthetic process and stable in performance, can improve the plastic processibility and electric conductivity of the electric contact material, and guarantees the excellent overall performance of the electric contact material while reducing the consumption of Ag.

Description

technical field [0001] The present invention relates to the preparation technology of electronic component materials, especially the preparation and industrial application of a novel ternary structure silver carbon nanotube lanthanum zirconate composite electrical contact material with the characteristics of axially distributed conductive channels. In low-voltage electrical appliances, switches and other related fields. Background technique [0002] Silver-based electrical contact materials are the key core materials for instruments and equipment in the electronics, electrical appliances, and telecommunications industries. As the core material, the comprehensive factors of silver-based electrical contact materials, including the cost of silver consumption, plastic processability, electrical and thermal conductivity, and high electrical life, determine its use value and service reliability in instruments and equipment. [0003] Silver-based electrical contact materials perfo...

Claims

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Application Information

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IPC IPC(8): C22C5/06C22C32/00C22C1/05H01H1/0237H01H1/027
CPCB22F2998/10C22C1/05C22C5/06C22C32/00H01H1/0237H01H1/027B22F1/0003B22F2009/041B22F3/14B22F2003/208
Inventor 张玲洁沈涛管秉钰杨辉樊先平张继
Owner ZHEJIANG UNIV
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