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Technology for preparing silver rare earth oxide electric contact material for low voltage electric apparatus with liquid phase method

A technology of rare earth oxides and low-voltage electrical appliances, applied in rare earth metal compounds, contacts, circuits, etc., to achieve the effect of improving electrical conductivity, improving welding resistance, and improving market competitiveness

Inactive Publication Date: 2013-08-07
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN200610041098.0 "A method for preparing copper-based composite material by obtaining composite powder by chemical precipitation method" adopts chemical precipitation method, but only obtains active nano precursor powder with controllable particle size and uniform chemical composition

Method used

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  • Technology for preparing silver rare earth oxide electric contact material for low voltage electric apparatus with liquid phase method
  • Technology for preparing silver rare earth oxide electric contact material for low voltage electric apparatus with liquid phase method
  • Technology for preparing silver rare earth oxide electric contact material for low voltage electric apparatus with liquid phase method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033](1) Weigh an appropriate amount of silver nitrate (analytical pure) crystal 8.5g with an electronic balance, dissolve it in deionized water, and make 250ml of silver nitrate solution with a concentration of 0.2mol / L, and preheat it in a 60°C water bath for 10min, A solution of silver ions is prepared.

[0034] Weigh 17.6g (0.1mol) of ascorbic acid into a Erlenmeyer flask, add deionized water to dissolve, stir until 250ml of transparent and clear solution is obtained, add 0.1mol / L sodium hydroxide solution to adjust pH = 7~8, then add dropwise 8ml of dispersant polyethylene glycol 400 to obtain a mixed solution of the three, then transfer the mixed solution to a two-necked bottle with a jacket, continue to stir, heat in a water bath, and heat up to 60°C to prepare a reducing solution.

[0035] Stir the reducing solution at a water bath temperature of 60°C. Transfer the prepared silver ion solution into a separatory funnel, and then drop the silver ion solution into the r...

Embodiment 2

[0053] The difference is that lanthanum chloride (LaCl 3 ·7H 2 O) instead of cerium chloride (CeCl 3 ﹒ 7H 2 O), and the rest are the same.

[0054] Using powder metallurgy process, according to Ag: La 2 o 3 =80:20 (mass ratio) 10g of metal silver and lanthanum oxide mixed powder is subjected to 18 tons of cold pressing, holding pressure for 0.5 hours—500°C sintering, holding temperature for 0.5 hours—36 tons of repressing, holding pressure for 1 hour— Refire at 850°C and hold for 2 hours to make silver rare earth oxide contact material.

[0055] Alloy sample performance indicators:

[0056]

Embodiment 3

[0058] The difference is that neodymium chloride (NdCl 3 ·6H 2 O) instead of cerium chloride (CeCl 3 ﹒ 7H 2 O), and the rest are the same.

[0059] Using powder metallurgy process, according to Ag: Nd 2 o 3 =90:10 (mass ratio) 10g of metal silver and neodymium oxide mixed powder is subjected to 22 tons of cold pressing, holding pressure for 0.5 hours—sintering at 600°C, heat preservation for 0.5 hours—44 tons of repressing, holding pressure for 1 hour— Refire at 900°C and hold for 2 hours to make silver rare earth oxide contact material.

[0060] Alloy sample performance indicators:

[0061]

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Abstract

The invention relates to a technology for preparing a silver rare earth oxide electric contact material for a low voltage electric apparatus with a liquid phase method. According to the method, a chemical reduction method is combined with a homogeneous precipitation method to prepare nano-silver and rare earth oxide powder, and the silver rare earth oxide electric contact material is prepared by adopting a powder metallurgy technology, so that the contact material has high hardness, density and electric conductivity. The material used in the technology is easily available and little, and the cost is low; the chemical reduction method is combined with homogeneous precipitation method to prepare nano-silver and rare earth oxide powder, so that the technology is simple, the nano-silver and rare earth oxide powder are easy for industrial production, and the technology is environment-friendly and meets the currently recommended requirement of low-carbon production; and the contact material has good electrical property, 10%-30% of silver can be saved, and the contact material is a novel silver-saving electrical contact material.

Description

technical field [0001] The technical solution of the invention is a chemical reduction method and a homogeneous precipitation method for preparing ultrafine silver and rare earth oxide powders and silver rare earth oxide electrical contact materials, belonging to the technical field of preparation of silver-based electrical contact materials containing rare earth oxides. Background technique [0002] The electrical contact element is the core component of the high and low voltage switchgear, which is responsible for the work of connecting, breaking, diverting, and isolating the electrical appliance. Its performance directly affects the reliability, stability, accuracy and service life of the conductive system of electrical appliances and electronics. , and the key to ensure the excellent performance of electrical contact components is the research and development and preparation of electrical contact materials. At present, the research and application of electrical contact m...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C32/00H01H1/0237B22F9/24C01F17/00
Inventor 王景芹王海涛朱艳彩
Owner HEBEI UNIV OF TECH
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