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Superfine powder cooling method

A technology of ultra-fine powder and cooling method, which is applied in the direction of coating, etc., can solve the problems of unstable surface, easy oxidative agglomeration and other reactions of ultra-fine powder, high material consumption and energy consumption, and achieve the prevention of agglomeration and convenient Effects of collection and energy saving

Active Publication Date: 2014-05-14
JIANGSU BOQIAN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Use gas at room temperature to cool solid ultrafine powder particles above 1000 degrees Celsius and their carrier gas (the volume ratio of solid ultrafine powder particles to their carrier gas volume is about 1:30000), and the amount of cooling gas used is about 1:30000 for solid ultrafine powder The volume of solid particles and their carrier gas is more than 10 times, that is, the cooling gas is about 300,000 times the volume of solid ultrafine powder vibration, and the material consumption and energy consumption are high.
In addition, the coating layer formed by the cooling gas is relatively thin, and after being cooled by the cooling gas, the surface of the ultrafine powder is still hot (higher than room temperature, about 100 degrees Celsius), which makes the ultrafine powder more prone to oxidation, agglomeration and other reactions, the surface is very unstable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A cooling method for ultra-fine copper powder (particle size about 1 μm), atomizing the aqueous solution of hydrazine hydrate as the solute into a particle diameter of 50-300 μm, spraying it into the cooler between the gas phase particle generator and the collector, and covering it The ultrafine copper powder particles are cooled on the surface of the ultrafine copper powder particles, and the cooled ultrafine copper powder enters the collector for deposition, and the vibration volume ratio of the liquid phase protective medium to the ultrafine copper powder is greater than 300. Fine copper powder cooling to 100 degrees Celsius is required.

Embodiment 2

[0014] A cooling method for ultra-fine silver powder (particle size about 1 μm). After water is atomized into particles with a diameter of 50-300 μm, it is sprayed into the cooler between the gas-phase method particle generator and the collector, and the surface of the ultra-fine silver powder is coated on the surface of the ultra-fine silver powder. The fine silver powder particles are cooled, and the cooled ultrafine silver powder particles enter the collector for deposition, and the vibration volume ratio of the liquid phase protective medium to the ultrafine silver powder is greater than 300, which can meet the requirement of cooling the ultrafine silver powder to 100 degrees Celsius .

Embodiment 3

[0016] A cooling method for ultra-fine nickel powder (particle size about 0.3 μm). After atomizing hydrous ethanol into particles with a diameter of 50-100 μm, it is sprayed into the cooler between the gas-phase method particle generator and the collector, and coated with ultra-fine nickel. The ultrafine nickel powder particles are cooled on the surface of the powder particles, and the cooled ultrafine nickel powder particles enter the collector for deposition, and the vibration volume ratio of the liquid phase protection medium to the ultrafine nickel powder is greater than 300 to realize the ultrafine powder Body cooling to 100°C is required.

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Abstract

The invention provides a superfine powder cooling method. The method comprises the following steps of: atomizing a liquid phase protecting medium into particles with the diameter of 10 to 5,000 microns, spraying the particles into a cooler between a gas phase particle generator and a collector, coating the liquid phase protecting medium on the surface of superfine powder, cooling the superfine powder, and depositing the cooled superfine powder in the collector, wherein the tap volume ratio of the liquid phase protecting medium to the superfine powder is more than 50. The liquid phase protecting medium is water or an aqueous solution or organic liquid or an organic solution. By the superfine powder cooling method, material consumption and energy consumption are low, and the cooled superfine powder is strong in stability and good in dispersity.

Description

technical field [0001] The invention relates to the technical field of ultrafine powder, in particular to an ultrafine powder cooling method. Background technique [0002] After the ultrafine powder is generated into solid ultrafine powder particles by the gas phase particle generator, due to its high temperature, it must be cooled before entering the collector. The existing technology uses cooling gas to cool ultrafine powder, that is, the cooling gas is sprayed into the cooler between the gas phase particle generator and the collector, so that the cooling gas is coated on the surface of solid ultrafine powder particles to cool them. This method has a slow cooling rate, and because the temperature of the solid ultrafine powder particles and their carrier gas is very high, a large amount of cooling gas is required to cool the solid ultrafine powder particles and their carrier gas. Use gas at room temperature to cool solid ultrafine powder particles above 1000 degrees Celsiu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02
Inventor 赵登永陈钢强孙运华潘经珊杨正勇
Owner JIANGSU BOQIAN NEW MATERIALS
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