Apparatus for producing metal powder and method of producing metal powder

Patent metadata

Field	Value
Publication number	US-11235390-B2
Application number	US-201816644915-A
Country	US
Kind code	B2
Filing date	Sep 4, 2018
Priority date	Sep 7, 2017
Publication date	Feb 1, 2022
Grant date	Feb 1, 2022

Abstract

To provide an apparatus for producing a metal powder and a method of producing a metal powder capable of obtaining a metal powder having a finer particle size of excellent quality. A supersonic combustion flame is intensively injected into a downwardly supplied molten metal, the intensive combustion flame is jetted directly downwardly as a focused jet flow, the focused jet flow thrusts into a turning water flow formed along an inner peripheral surface of a pulverization cooling cylinder whose axis line is inclined from a vertical direction, and an intensive position of the combustion flame is in an open space above the turning water flow.

First claim

The invention claimed is:

1. An apparatus for producing a metal powder, comprising:
a supply unit that downwardly supplies a molten metal;
a combustion flame injection unit that convergently injects a supersonic combustion flame from a combustion flame injection port to the molten metal supplied from the supply unit and jets the convergent combustion flame as a focused jet flow directly downward; and
a pulverization device having a pulverization cooling cylinder that forms a revolving water flow along an inner peripheral wall of the pulverization cooling cylinder, which has an axis line that is inclined relative to a vertical direction, and that thrusts the focused jet flow inflowing from an upper opening into the revolving water flow,
wherein a convergence position of the combustion flame is (1) in an open space above the opening; (2) above the axis line of the pulverization cooling cylinder; and, (3) above a virtual horizontal plane passing through an upper end edge of the pulverization cooling cylinder.

2. The apparatus for producing a metal powder according to claim 1 , wherein the convergence position is within a range of 15 to 120 mm from a lower end of the combustion flame injection port.

3. The apparatus for producing a metal powder according to claim 1 , wherein:
an inclination angle of the axis line of the pulverization cooling cylinder with respect to the vertical direction is from 10° to 55°, and
a tip of the combustion flame injection port is above a virtual horizontal plane passing through an upper end edge of the pulverization cooling cylinder.

Assignees

• Hard Industry Yg
• Hitachi Metals Ltd

Inventors

• Yamagata Torao
• Yamagata Takuichi
• Izaki Hiroshi

Classifications

• B22F1/08

  Metallic powder characterised by particles having an amorphous microstructure · CPC title

• B22F1/065

  Spherical particles · CPC title

• B22F1/05

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

• B22F2009/0892

  casting nozzle; controlling metal stream in or after the casting nozzle · CPC title

• B22F9/082 Primary

  atomising using a fluid (using centrifugal force B22F9/10) · CPC title