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Preparation method of porous aluminum powder with high specific surface area

A high specific surface area, porous silver technology, applied in the field of preparation of high specific surface area porous silver powder, can solve the problems of unbalanced current density distribution, low electrode potential, and large local performance differences, etc., to achieve high battery discharge step voltage and high utilization The effect of high efficiency and short process

Inactive Publication Date: 2009-03-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The specific surface area of ​​the silver powder prepared by the above method is about 1.5~2m 2 / g, the AgO electrode produced after pressing, sintering and oxidation has a low electrode potential, about 0.15V (theoretical value: 0.45V), and the utilization rate is about 65%, and its oxygen content is low (about 65%). Serious oxidation, low potential, low utilization rate during discharge (60% to 70%), and poor fluidity lead to poor machining performance. Silver electrodes can only be made by hand, which is likely to cause unbalanced current density distribution and large local performance differences. , working voltage drop and other issues, and reduce production efficiency, increase labor costs

Method used

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  • Preparation method of porous aluminum powder with high specific surface area
  • Preparation method of porous aluminum powder with high specific surface area
  • Preparation method of porous aluminum powder with high specific surface area

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The weight of the pure silver ingot with a purity of 99.9% is: 1000g, and the weight of the silver-magnesium alloying element magnesium is: 538.5g (mass ratio: 35%); the magnesium is smelted using a resistance furnace and a graphite crucible, and the melting temperature is 750°C During the smelting process, argon protection is used. After the magnesium is completely melted, silver ingots are added to the molten liquid magnesium in proportion, kept warm until the silver is completely melted, then fully stirred, cast in an iron mold, mechanically crushed after natural cooling, and argon Ball milling under protection, ball milling parameters: rotating speed: 200r / min, ball-to-material ratio: R=15, ball milling for 48 hours, passing through a 325-mesh sieve. Get the silver-magnesium alloy powder 1000g after sieving and put into the mixed acid solution of 5.0~5.9 liters (1.2%×350×120%~1.2%×350×140%) (the mixed acid is composed of: 1 volume of 36.5% concentrated hydrochloric a...

Embodiment 2

[0016] The weight of silver ingot with a purity of 99.9% is: 1000g, and the weight of silver-magnesium alloying element magnesium is: 176.5g (mass ratio: 15%); magnesium is smelted using a resistance furnace and a graphite crucible, and the melting temperature is 720°C During the smelting process, argon protection is used. After the magnesium is completely melted, silver ingots are added to the molten liquid magnesium in proportion, kept warm until the silver is completely melted, then fully stirred, cast in an iron mold, mechanically crushed after natural cooling, and argon Ball milling under protection, the ball milling parameters are: rotating speed: 180r / min, ball-to-material ratio: R=10, ball milling for 44 hours, passing through a 325-mesh sieve. Get the silver-magnesium alloy powder 1000g after sieving and put into 2.2~2.6 liters (1.2%×150×120%~1.2%×150×140%) mixed acid solution (mixed acid composition is: 1 volume 36.5% concentrated hydrochloric acid+ 9 volumes of 98% ...

Embodiment 3

[0018] The weight of the pure silver ingot with a purity of 99.9% is: 1000g, and the weight of the silver-magnesium alloying element magnesium is: 298.7g (mass ratio: 23%); the magnesium is smelted using a resistance furnace and a graphite crucible, and the smelting temperature is 780°C During the smelting process, argon protection is used. After the magnesium is completely melted, silver ingots are added to the molten liquid magnesium in proportion, kept warm until the silver is completely melted, then fully stirred, cast in an iron mold, mechanically crushed after natural cooling, and argon Ball milling under protection, the ball milling parameters are: rotating speed: 220r / min, ball-to-material ratio: R=20, ball milling for 52 hours, passing through a 325-mesh sieve. Get the silver-magnesium alloy powder 1000g after sieving and put into 3.3~3.9 liters (1.2%×230×120%~1.2%×230×140%) mixed acid solution (mixed acid composition is: 1 volume 36.5% concentrated hydrochloric acid+ ...

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Abstract

The invention discloses a preparation method of porous silver powder with high specific surface area, which takes sycee with the purity of 99.9 percent as a substrate material, and the weight percentage of alloyed element magnesium in a silver-magnesium alloy is: 15 to 35 percent; an electric resistance furnace and a graphite crucible are adopted to smelt the magnesium, with a smelting temperature of between 720 and 780DEG C, the smelting process is protected by argon gas, the sycee is added into the fused magnesium in proportion after the complete fusion of magnesium, the mixture is insulated until the silver is completely fused and is then fully agitated, and is cast into a swage and undergoes mechanical crushing after natural cooling and ball grinding under the protection of argon gas, wherein, ball grinding parameters are: rotary speed: 180 to 220r / min, ratio of grinding media to material: R=10-20, and ball grinding time: 44 to 52h, thereby meeting the particle size demand; and the silver-magnesium alloy powder is put into a mixed acid solution with the excessive volume of 20 percent to 40 percent after the ball grinding, is taken out after the corrosion for 44 to 52h, and is then washed, filtered, dried and sieved. The invention provides the preparation method of porous silver powder with high production efficiency, low production cost, large specific surface area of finished products, high activity and strong permeability.

Description

technical field [0001] The invention relates to a method for preparing porous silver powder with high specific surface area, in particular to a method for preparing silver-based alloy by alloying method, and then corroding to prepare porous silver powder after milling by crushing balls. Background technique [0002] Porous materials are new materials developed in recent years, which have the characteristics of structural materials and functional materials. The large number of voids in the porous material determines its characteristics such as small specific gravity, high specific strength, good energy absorption, large specific surface area, good permeability, and sensitivity to gases. These properties make porous materials widely used in filters, catalysts, etc. Carriers, heat exchangers, porous metal electrodes, etc. [0003] The silver oxide electrode obtained by sintering the fine porous silver powder into oxides can be used as positive electrode materials for zinc / silv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/00C22C1/04B22F9/04
Inventor 马正青左列庞旭
Owner CENT SOUTH UNIV