Metal microparticle production method and metal microparticle production device

Patent metadata

Field	Value
Publication number	US-11318534-B2
Application number	US-201916595445-A
Country	US
Kind code	B2
Filing date	Oct 7, 2019
Priority date	Oct 26, 2018
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

To provide a method for efficiently producing metal microparticles having a particle diameter of 1 μm to 10 μm, and a device for producing the same. A metal microparticle production method is used, which includes a particle generating step of generating primary particles by irradiating a metal lump in a solvent in a first tank with an ultrasonic wave, and a particle splitting step of irradiating the primary particles with an ultrasonic wave in a solvent in a second tank and splitting the primary particles to produce secondary particles. Further, a metal microparticle production device is used, which includes: a first tank that has a solvent and a metal lump; a first heating unit that heats the solvent in the first tank; a first ultrasonic vibrator that is disposed in the first tank and irradiates the metal lump with an ultrasonic wave to generate primary particles; a second tank that has the solvent and the primary particles; and a second ultrasonic vibrator that irradiates the primary particles with an ultrasonic wave to split the primary particles.

First claim

What is claimed is:

1. A metal microparticle production device, comprising:
a first tank configured to contain a solvent and a metal lump;
a first heating unit that heats the solvent in the first tank;
a first ultrasonic vibrator that is disposed in the first tank and irradiates the metal lump with a first ultrasonic wave to generate primary particles;
a second tank configured to contain the solvent and the primary particles;
a second ultrasonic vibrator that irradiates the primary particles with an ultrasonic wave to split the primary particles; and
a partition between the first tank and the second tank, wherein the primary particles and the solvent flow from the first tank to the second tank over the partition.

2. The metal microparticle production device according to claim 1 , further comprising a plurality of temperature measurement units for measuring temperatures of a second heating unit, a cooling device, and the solvent disposed in the second tank.

3. A metal microparticle production device, comprising:
a first tank configured to contain a solvent and a metal lump;
a first heating unit that heats the solvent in the first tank;
a first ultrasonic vibrator that is disposed in the first tank and irradiates the metal lump with a first ultrasonic wave to generate primary particles;
a second tank configured to contain the solvent and the primary particles; and
a second ultrasonic vibrator that irradiates the primary particles with an ultrasonic wave to split the primary particles
wherein in the second tank, a second ultrasonic vibration generating element is provided at a portion connected to the first tank, a second heating unit is positioned on one side surface of the second ultrasonic vibration generating element, and a cooling device is provided on the other side surfaces thereof.

4. The metal microparticle production device according to claim 3 , wherein the second heating unit, the second ultrasonic vibration generating element, and the cooling device are arranged in a row in this order, a pump is disposed behind the cooling device, and the pump transmits the solvent to the second heating unit.

5. A metal microparticle production device, comprising:
a first tank configured to contain a solvent and a metal lump;
a first ultrasonic vibrator that is disposed in the first tank and irradiates the metal lump with an ultrasonic wave to generate primary particles;
a second tank that has the solvent and the primary particles; and
a second ultrasonic vibrator that is disposed in the second tank, irradiates the primary particles with an ultrasonic wave, and aggregates the primary particles to generate tertiary particles larger than the primary particles.

6. The metal microparticle production device according to claim 5 , wherein the second tank includes a magnet that applies a magnetic field to a flow of a solvent containing the primary particles and the tertiary particles to thereby classify the primary particles and the tertiary particles.

7. The metal microparticle production device according to claim 5 , further comprising a dissolved gas concentration adjustment device that adjusts a dissolved gas concentration of the solvent disposed in the first tank or the second tank.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Furusawa Akio
• Hine Kiyohiro
• Ishitani Shinji
• Takahashi Misato

Classifications

• B22F1/148

  Agglomerating · CPC title

• B22F1/05

  Metallic powder characterised by the size or surface area of the particles · CPC title

• B22F2999/00

  Aspects linked to processes or compositions used in powder metallurgy · CPC title

• B22F9/08 Primary

  by casting, e.g. through sieves or in water, by atomising or spraying (using electric discharge B22F9/14) · CPC title

• B22F2009/049

  by pulverising at particular temperature · CPC title