Apparatus for producing metal powder and method of producing metal powder
AssigneesHard Industry Yugen Kaisha, Hitachi Metals, Ltd.
InventorsTorao YAMAGATA, Takuichi YAMAGATA, Hiroshi IZAKI
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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.
Claims12
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 in an open space above the opening.
A method of producing a metal powder, the method comprising:
- convergently injecting a supersonic combustion flame into a molten metal that is downwardly supplied, and jetting the convergent combustion flame as a focused jet flow directly downward;
- thrusting the focused jet flow into a revolving water flow formed along an inner peripheral surface of a pulverization cooling cylinder having an axis line that is inclined relative to a vertical direction;
- and
- configuring a convergence position of the combustion flame in an open space above the revolving water flow.
A method of producing a metal powder, comprising:
- a first pulverizing step of convergently injecting a supersonic combustion flame into a downwardly supplied molten metal and firstly pulverizing the molten metal to form molten droplets;
- a second pulverizing step of jetting the combustion flame as a focused jet flow including the firstly pulverized droplets directly downward, moving the firstly pulverized droplets in the focused jet flow, which has a relatively fast speed, and secondly pulverizing the droplets to form smaller molten droplets;
- and
- a third pulverizing step of thrusting the focused jet flow including the secondly pulverized droplets into a revolving water flow and thirdly pulverizing and cooling the focused jet flow to make a metal powder smaller than the secondly pulverized droplets.
Dependencies are inferred from the claim text.