JP2019031712A - Metal powder production apparatus and method for producing metal powder - Google Patents

Abstract

To provide a metal powder production apparatus which exhibits an excellent cooling action.SOLUTION: There is provided a metal powder production apparatus which comprises a molten metal feeding part for discharging a molten metal, a cylindrical body installed below the molten metal feeding part and a cooling fluid forming part for forming a flow of a cooling fluid for cooling the molten metal discharged from the molten metal feeding part in the cylindrical body, where the cooling fluid forming part which flows out the cooling fluid spreading in a film form from the upper part in the axial direction of the cylindrical body to the lower part along the inner circumferential face of the cylindrical body and forms a flow of the cooling fluid in the cylindrical body.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a metal powder production apparatus and a metal powder production method.

  For example, as shown in Patent Document 1, a metal powder manufacturing apparatus that manufactures metal powder using a so-called gas atomization method and a manufacturing method using the apparatus are known. The conventional apparatus includes a molten metal supply container that discharges molten metal, a cylinder installed below the molten metal supply container, and a flow of a coolant that cools the molten metal discharged from the molten metal supply unit. And a cooling liquid layer forming part formed along the inner peripheral wall of the cylindrical body.

  The cooling liquid layer forming means sprays the cooling liquid linearly toward the tangential direction of the inner peripheral wall of the cooling cylinder, and causes the cooling liquid to flow down while swirling along the inner peripheral wall of the cooling container. Forming a layer. By using the cooling liquid layer, it is expected that the droplets can be rapidly cooled to produce a highly functional metal powder.

  However, in the conventional apparatus, even if the cooling liquid is sprayed linearly toward the tangential direction of the inner peripheral wall of the cooling cylinder, a part of the cooling liquid collides with the inner peripheral wall of the cylindrical body and bounces off. This causes a problem of entraining a large amount of air in the liquid flow and cannot provide a sufficient cooling effect.

Japanese Patent Laid-Open No. 11-80812

  This invention is made | formed in view of such an actual condition, The objective is to provide the manufacturing method of the metal powder which uses the metal powder manufacturing apparatus which has the outstanding cooling effect | action, and it.

In order to achieve the above object, a metal powder production apparatus according to the present invention comprises:
A molten metal supply unit for discharging the molten metal;
A cylinder installed below the molten metal supply unit, and a cooling liquid flow forming unit that forms a flow of cooling liquid for cooling the molten metal discharged from the molten metal supply unit in the cylinder. A metal powder production apparatus comprising:
The cooling liquid flow forming part flows out the cooling liquid in a film shape along the inner peripheral wall of the cylindrical body from the upper part to the lower part in the axial direction of the cylindrical body, and the flow of the cooling liquid into the cylindrical body It is characterized by forming.

In order to achieve the above object, a method for producing a metal powder according to the present invention comprises:
Forming a flow of the coolant along the inner peripheral wall of the cylinder installed below the molten metal supply unit;
Discharging the molten metal from the molten metal supply unit toward the flow of the cooling liquid, and a method for producing a metal powder comprising:
In the step of forming the flow of the cooling liquid, the cooling liquid flows out in a film shape along the inner peripheral wall of the cylindrical body from the upper part of the cylindrical body downward.

  In the metal powder manufacturing apparatus and the metal powder manufacturing method according to the present invention, the coolant flows out in the form of a film along the inner peripheral wall of the cylindrical body from the upper part to the lower part in the axial direction of the cylindrical body. A coolant flow is formed. In the conventional metal powder manufacturing apparatus, since the cooling liquid was caused to flow out linearly, there was a problem of entraining a large amount of air in the flow of the cooling liquid, but in the present invention, the cooling liquid is flowed out in a film shape. Thus, it is possible to effectively suppress the problem of entraining atmospheric gas such as air in the flow of the cooling liquid and enhance the cooling effect by the cooling liquid.

  Further, for example, the coolant flow forming part may have an outer peripheral part having a first flow path cross-sectional area. Since the coolant flow forming portion has the outer peripheral portion, the direction in which the coolant flows in the outer peripheral portion is adjusted, thereby preventing the problem that air or the like is involved in the flow of the coolant flowing out of the coolant flow forming portion.

  Further, for example, the outer peripheral portion may be formed along a plane orthogonal to the axial direction of the cylindrical body and along a concentric direction of the inner peripheral wall of the cylindrical body. By forming the outer peripheral portion in this way, the direction in which the coolant flows in the outer peripheral portion can be adjusted, and the problem that the coolant flowing out from the coolant flow forming portion collides with the inner peripheral wall and entrains air or the like can be prevented.

  Further, for example, the coolant flow forming portion has a second flow path cross-sectional area that is narrower than the first flow path cross-sectional area, and has an inflow portion that allows the coolant to flow into the outer peripheral portion. A cooling liquid discharge having a third flow path cross-sectional area narrower than the first flow path cross-sectional area and allowing the cooling liquid to flow out in a film form from the outer peripheral portion along the inner peripheral wall. And may have a part. It is possible to effectively rectify while adjusting the flow direction of the coolant by increasing the cross-sectional area of the flow path at the outer periphery, and by reducing the flow-path cross-sectional area of the coolant discharge part, the flow rate of the coolant can be reduced. Since it can raise, such a metal powder manufacturing apparatus has the outstanding cooling effect with respect to a molten metal.

  In addition, for example, the metal powder manufacturing apparatus is connected to the inflow portion along a direction inclined in the axial direction of the cylindrical body, and supplies a coolant to the inflow portion. May further be included. The metal powder manufacturing apparatus having such a coolant supply unit can easily adjust the direction in which the coolant flows in the outer peripheral part in the direction concentric with the inner peripheral wall, and the cooling outflow from the coolant flow forming unit The problem that the liquid collides with the inner peripheral wall and entrains air can be prevented.

  The cooling liquid flow forming section may include a cooling liquid discharge section that extends along the radial direction of the cylindrical body and allows the cooling liquid to flow out from the outer peripheral section along the inner peripheral wall in a film shape. Good. Since the cooling liquid discharge part extends along the radial direction of the cylindrical body, it is possible to prevent the problem that the cooling liquid flowing out from the cooling liquid flow forming part collides with the inner peripheral wall and entrains air.

  Further, the cooling liquid discharge part may have an opening width wider on the outer diameter side than on the inner diameter side. The coolant flow forming unit having such a coolant discharge unit stabilizes the flow of the coolant along the inner peripheral wall because the amount of the coolant flowing out increases as it approaches the inner peripheral wall. The problem of entraining gas such as can be prevented.

  In addition, for example, the coolant flow forming portion may have an outer peripheral portion that has a first flow path cross-sectional area and accumulates the pressure of the coolant, and the outer peripheral portion is formed of the cylindrical body. It may be formed along a plane orthogonal to the axial direction and along a concentric direction of the inner peripheral wall of the cylindrical body, and the coolant discharge part is arranged along a direction in which the outer peripheral part is formed. It may be. By disposing the coolant discharge part along the outer peripheral part formed along the orthogonal surface of the inner peripheral wall and the concentric direction of the inner peripheral wall, air or the like is involved in the flow of the coolant formed inside the inner peripheral wall. Can prevent problems.

FIG. 1 is a schematic cross-sectional view of a metal powder manufacturing apparatus according to an embodiment of the present invention. FIG. 2 is a perspective view showing a coolant flow forming unit and a coolant supply unit included in the metal powder apparatus shown in FIG. FIG. 3 is an enlarged partial perspective view of a part of the coolant flow shape portion shown in FIG. FIG. 4 is a conceptual diagram showing the shape of the coolant discharge section included in the coolant flow forming section shown in FIG. FIG. 5 is a conceptual diagram showing a first modified example related to the coolant discharge section of the coolant flow forming section. FIG. 6 is a partially enlarged view showing a second modified example related to the coolant supply unit.

  Hereinafter, the present invention will be described based on embodiments shown in the drawings.

First Embodiment As shown in FIG. 1, a metal powder manufacturing apparatus 10 according to an embodiment of the present invention is formed of a large number of metal particles by cooling and solidifying a molten metal 21 by an atomizing method (gas atomizing method). An apparatus for obtaining metal powder. The metal powder manufacturing apparatus 10 includes a molten metal supply unit 20 that discharges the molten metal 21 and a cooling unit 30 that is disposed below the molten metal supply unit 20 in the vertical direction. In the drawings, the vertical direction is a direction along the Z axis.

  The molten metal supply unit 20 includes a heat-resistant container 22 that stores the molten metal 21. A heating coil 24 is disposed on the outer periphery of the heat resistant container 22, and the molten metal 21 accommodated in the heat resistant container 22 is heated and maintained in a molten state. A discharge port 23 is formed at the bottom of the heat-resistant container 22, from which the molten metal 21 is directed toward the coolant flow 60 formed on the inner peripheral wall 33 of the cylindrical body 32 of the cooling unit 30. It is discharged as dripping molten metal 21a.

  A gas injection unit 26 is disposed on the outer peripheral portion of the outer bottom wall of the heat resistant container 22 so as to surround the discharge port 23. The gas injection unit 26 includes a gas injection port 27. High-pressure gas is injected from the gas injection port 27 toward the dropped molten metal 21 a discharged from the discharge port 23. The high-pressure gas is jetted obliquely downward from the entire circumference of the dropped molten metal 21a discharged from the discharge port 23. The dropped molten metal 21a becomes a large number of droplets, and is cylindrical along the gas flow. It is carried toward the flow 60 of the coolant formed on the inner peripheral wall 33 in the portion 32a.

  The molten metal 21 may contain any element. For example, a metal containing at least one of Ti, Fe, Si, B, Cr, P, Cu, Nb, and Zr can be used. These elements are highly active, and the molten metal 21 containing these elements is easily oxidized to form an oxide film by contact with air for a short period of time, making it difficult to miniaturize. Yes. As described above, the metal powder manufacturing apparatus 10 can easily pulverize even the molten metal 21 that easily oxidizes by using an inert gas as the gas injected from the gas injection port 27 of the gas injection unit 26. it can.

  The gas injected from the gas injection port 27 is preferably an inert gas such as nitrogen gas, argon gas or helium gas, or a reducing gas such as ammonia decomposition gas. However, if the molten metal 21 is a metal that is difficult to oxidize. Air may be used.

  The cooling unit 30 includes a cylindrical body 32 installed below the molten metal supply unit 20, a cooling liquid flow forming unit 40 that forms a coolant flow 60 for cooling the molten metal 21 in the cylindrical body 32, and a cooling liquid And a supply unit 50 (see FIG. 2 for the coolant supply unit 50). The cylindrical body 32 has a cylindrical portion 32a connected to one end of the cylindrical portion 32a connected to the molten metal supply portion 20 and a conical portion 32b connected to the other end of the cylindrical portion 32a. Have The inner diameter of the inner peripheral wall 33 of the cylindrical portion 32a is not particularly limited, but is preferably 50 to 500 mm.

  In the present embodiment, the axial direction O of the cylindrical body 32 is inclined at a predetermined angle θ1 with respect to the vertical line Z. Although it does not specifically limit as predetermined angle (theta) 1, Preferably, it is 5-45 degree | times. By setting it as such an angle range, it becomes easy to discharge the dripping molten metal 21a from the discharge outlet 23 toward the flow 60 of the coolant formed in the inner peripheral wall 33 of the cylindrical body 32. The arrow in the axial direction O is a direction from the upper part to the lower part of the cylindrical body 32.

  The dropped molten metal 21a discharged toward the coolant flow 60 in the cylindrical body 32 collides with the coolant flow 60, and is further divided, refined, and cooled and solidified to form a solid metal powder. . A discharge portion 34 is provided below the cylindrical body 32 along the axial direction O, and the metal powder contained in the coolant flow 60 can be discharged together with the coolant to the outside. The metal powder discharged together with the cooling liquid is separated from the cooling liquid and taken out in an external storage tank or the like. The cooling liquid is not particularly limited, but cooling water is used.

  An adjustment plate 35 is fixed to the inner peripheral wall 33 on the downstream side of the coolant flow 60.

  In the present embodiment, the coolant flow forming portion 40 is provided in the upper part of the cylindrical body 32 in the axial direction O. The cooling liquid flow forming unit 40 flows the cooling liquid from the upper part to the lower part in the axial direction O of the cylindrical body 32 via the cooling liquid discharge part 46, and forms the cooling liquid flow 60 in the cylindrical body 32. .

  The coolant flow forming part 40 shown in FIG. 1 flows out the coolant in the form of a film along the inner peripheral wall 33 of the cylindrical body 32. FIG. 2 is a perspective view showing the coolant flow forming part 40 and the coolant supply part 50 (not shown in FIG. 1) shown in FIG. As shown in FIG. 2, the cooling liquid flow forming part 40 includes a first cooling liquid flow forming part 40 </ b> A and a second cooling liquid flow forming arranged in a ring shape along the concentric direction V of the inner peripheral wall 33 of the cylindrical body 32. Part 40B, third cooling liquid flow forming part 40C, fourth cooling liquid flow forming part 40D, fifth cooling liquid flow forming part 40E, sixth cooling liquid flow forming part 40F, seventh cooling liquid flow forming part 40G, eighth The coolant flow forming unit 40H is composed of eight coolant flow forming units. The first to eighth cooling liquid flow forming portions 40A to 40H have the same shape and structure except that the arrangement with respect to the concentric direction V is different. Therefore, the first cooling liquid flow forming portion 40A will be described as an example. The description of the other coolant flow forming unit is omitted.

  FIG. 3 is an enlarged view showing the first coolant flow forming portion 40A in the coolant flow forming portion 40 in an enlarged manner. As shown in FIG. 3, the first coolant flow forming part 40 </ b> A has an outer peripheral part 44, an inflow part 42, and a coolant discharge part 46. The outer peripheral portion 44 has a first flow path cross-sectional area S1, and the coolant flows inside. The outer peripheral portion 44 has a first flow path cross-sectional area S1 wider than an inflow portion 42 and a coolant discharge portion 46 which will be described later, and the coolant flowing through the outer peripheral portion 44 has a relatively low flow velocity. Therefore, the outer peripheral portion 44 changes the direction in which the coolant flows in the direction in which the coolant flows in a direction in which it is difficult to entrain air or the like when the coolant flows out from the coolant discharge portion 46 by changing the direction in which the coolant flows. Suitable for adjusting.

  The outer peripheral portion 44 is formed along a plane P1 (see FIG. 1) orthogonal to the axial direction O of the cylindrical body 32 and along the concentric direction V of the inner peripheral wall 33 of the cylindrical body 32. Such an outer peripheral portion 44 can adjust the flow direction of the cooling liquid to the concentric direction V of the inner peripheral wall 33, and can form a flow 60 of the cooling liquid with little entrainment of air or the like on the inner peripheral wall 33.

  As shown in FIG. 3, the inflow portion 42 has a second flow path cross-sectional area S <b> 2 that is narrower than the first flow path cross-sectional area S <b> 1, and allows the coolant to flow into the outer peripheral portion 44. The inflow part 42 is connected to a first coolant supply part 50 </ b> A that supplies the coolant to the inflow part 42. The first coolant supply unit 50A has a second flow path cross-sectional area S2 like the inflow portion 42. Further, the first coolant supply part 50A is connected to the inflow part 42 along the axial direction O of the cylindrical body 32.

  As shown in FIG. 3, the coolant discharge portion 46 has a third flow path cross-sectional area S3 that is narrower than the first flow path cross-sectional area S1, and extends from the outer peripheral portion 44 to the inner peripheral wall 33 of the cylindrical body 32. Along with this, the cooling liquid is allowed to flow out into a film. Since the cooling liquid discharge part 46 has an elongated gap shape extending along the radial direction N of the cylindrical body 32, unlike the circular cooling liquid discharge part, the cooling liquid can flow out in a film shape. Further, the coolant discharge portion 46 formed on the bottom wall of the outer peripheral portion 44 and the inflow portion 42 formed on the top wall of the outer peripheral portion 44 are shifted from each other along the concentric direction V of the inner peripheral wall 33. Is formed. That is, the inflow portion 42 is provided at one end of the outer peripheral portion 44 in the concentric direction, and the coolant discharge portion 46 is provided at the other end of the outer peripheral portion 44 in the concentric direction V. Thereby, the flow direction of the coolant is deflected in the concentric direction V inside the outer peripheral portion 44.

  FIG. 4 is a conceptual diagram showing the shape of the coolant discharge section 46 included in the coolant flow forming section 40 shown in FIGS. As shown in FIG. 4, the coolant discharge part 46 is configured by a gap formed at a corner between the flow path side wall 44 a along the radial direction N in the outer peripheral part 44 and the flow path bottom wall 44 b. The coolant discharge section 46 causes the coolant in the outer peripheral portion 44 to flow out in an oblique direction (outflow direction Q) inclined in the axial direction O of the cylindrical body 32. The width of the gap constituting the coolant discharge section 46 is not particularly limited, but is preferably 10 μm to 5 mm from the viewpoint of forming a high-speed coolant flow 60 without entraining air.

  Since the coolant discharge section 46 has a third flow path cross-sectional area S3 that is narrower than the first flow path cross-sectional area S1 at the outer peripheral portion 44, the speed of the coolant flow 60 formed on the inner peripheral wall 33 is improved. The metal powder manufacturing apparatus 10 having such a coolant discharge part 46 can effectively cool the dropped molten metal 21a.

  As shown in FIG. 2, the second to eighth cooling liquid flow forming units 40B to 40H are also similar to the first cooling liquid flow forming unit 40A, the outer peripheral portion 44, the inflow portion 42, and the cooling liquid discharge portion 46. And have. In addition, second to eighth cooling liquid supply sections 50B to 50H are connected to the respective cooling liquid discharge sections 46 of the second to eighth cooling liquid flow forming sections 40B to 40H.

  As shown in FIG. 2, in the coolant flow forming part 40, a plurality of coolant discharge parts 46 are arranged along the orthogonal plane P <b> 1 and the concentric direction V, which are the formation directions of the outer peripheral part 44. With such an arrangement, it is possible to prevent a problem that air or the like is involved in the coolant flow 60 formed on the inner peripheral wall 33 of the cylindrical body 32. The number of the coolant discharge parts 46 and the outer peripheral parts 44 included in the coolant flow forming part 40 is not particularly limited, and may be singular or plural, but is preferably 6-12. The number of the coolant discharge parts 46 and the outer peripheral parts 44 may be the same or different. For example, the outer peripheral parts 44 may be continuous in the concentric direction V.

  In each of the first to eighth cooling liquid flow forming parts 40A to 40H, a cooling liquid discharge part 46 formed on the bottom wall of the outer peripheral part 44 and an inflow part 42 formed on the top wall of the outer peripheral part 44 are provided. , They are misaligned in the same rotational direction. With such an arrangement, it is possible to form a spiral cooling flow on the inner peripheral wall 33 of the cylindrical body 32 that is difficult to entrain air or the like at high speed. As shown in FIG. 1, the radial position of the outer diameter end of the coolant discharge portion 46 included in each of the first to eighth coolant flow forming portions 40A to 40H is the inner peripheral wall 33 in the cylindrical portion 32a. It is preferable from the viewpoint of preventing entrainment of air or the like in the coolant flow 60.

  The coolant that has flowed out of the coolant flow forming unit 40 as shown in FIG. 2 is formed in the cylindrical body 32 by the direction of the flow formed by the coolant flow forming unit 40 and the gravity that acts on the coolant after flowing out. A coolant flow 60 along the peripheral wall 33 is formed, typically a spiral coolant flow 60. In the metal powder manufacturing apparatus 10 shown in FIG. 1, the dropped molten metal 21 a shown in FIG. 1 is incident on the inner peripheral liquid surface of the coolant flow 60 formed in this way, and the dropped molten metal 21 a is cooled. While being cooled inside the liquid flow 60, it flows with the cooling liquid and moves toward the discharge portion 34.

  In the metal powder manufacturing apparatus 10 according to the present embodiment, the cooling liquid flow forming unit 40 causes the cooling liquid to flow out in a film shape, so that the cooling liquid flow 60 along the inner peripheral wall 33 of the cylindrical body 32 is difficult to involve air or the like. It is possible to efficiently cool the molten molten metal 21 a incident on the coolant flow 60. Further, in such a metal powder manufacturing apparatus 10, even if the pressure of the coolant supplied to the coolant flow forming unit 40 is increased, a turbulent flow such that the coolant flow 60 entrains air or the like is generated. Therefore, it is possible to rapidly cool the dripped molten metal 21a using the coolant flow 60 that is high-speed and laminar.

  As mentioned above, although embodiment was shown and the metal powder manufacturing apparatus which concerns on this invention was demonstrated, this invention is not limited only to the metal powder manufacturing apparatus 10 mentioned above, and having other embodiment and a modified example Needless to say. For example, FIG. 5 is an enlarged view showing the coolant discharge part 146 of the coolant flow forming part included in the metal powder manufacturing apparatus according to the first modification of the present invention.

  As shown in FIG. 5, the coolant discharge section 146 has an opening width W2 on the outer diameter side wider than the opening width W1 on the inner diameter side, and an opening width wider on the outer diameter side than the inner diameter side. The coolant flow forming section having such a coolant discharge section 146 stabilizes the coolant flow along the inner peripheral wall 33 because the amount of coolant flowing out increases as it approaches the inner peripheral wall 33 of the cylindrical body 32. The problem that the flow of the coolant entrains gas such as air can be prevented.

  FIG. 6 is a partially enlarged view showing the first and second coolant supply units 250A and 250B of the coolant supply unit 250 included in the metal powder manufacturing apparatus according to the second modification of the present invention. In the metal powder manufacturing apparatus according to the second modification, the coolant supply units 250A and 250B supplied with the coolant by the coolant supply units 250A and 250B are formed by the outer peripheral part 244 and the coolant discharge part 246. The coolant flow direction is the same as that of the coolant flow forming units 40A and 40B of the metal powder manufacturing apparatus 10 shown in the embodiment except that the flow direction (swirl direction) is opposite.

  As shown in FIG. 6, the first and second coolant supply units 250A and 250B are inclined in the axial direction O of the cylindrical body 32 with respect to the inflow portions of the first and second coolant flow forming units 240A and 240B. Connect along the direction you want. In particular, the inclination angle of the first and second cooling liquid supply units 250A and 250B with respect to the axial direction O is the same as the inclination angle at which the outflow direction Q for flowing out the cooling liquid from the cooling liquid discharge unit 46 is inclined with respect to the axial direction O. It is preferable that it is or approximates. The first and second coolant supply units 250A and 250B are inclined and connected to the first and second coolant flow forming units 240A and 240B as shown in FIG. It is possible to increase the flow rate of the coolant passing through the portion 46.

  Hereinafter, although this invention is demonstrated based on a more detailed Example, this invention is not limited to these Examples.

EXAMPLE Using the metal powder production apparatus 10 shown in FIG. 1, Fe-Si-B (Experiment No. 6), Fe-Si-Nb-B-Cu (Experiment No. 7), Fe-Si-B-P-Cu (Experiment No. 8), Fe-Nb-B (Experiment No. 9), and Fe-Zr-B (Experiment No. 10) were produced.

  In each experiment, the dissolution temperature was 1500 ° C., the injection gas pressure was 5 MPa, the gas type argon used was constant, and the coolant flow condition was a pump pressure of 7.5 kPa. In the examples, metal powder having an average particle diameter of about 25 μm could be produced. The average particle size was determined by measurement using a dry particle size distribution measuring device (HELLOS). Moreover, the crystal analysis of the metal powder produced by experiment number 6-10 was evaluated by the powder X-ray diffraction method. The magnetic properties of the metal powder were measured by measuring the coercive force (Oe) with an Hc meter. The results are shown in Table 1.

Comparative Example A metal powder (experiment number) was prepared in the same manner as in the example using the same metal powder production apparatus as in the example, except that a circular coolant discharge unit was provided and the coolant flowed out linearly. 1-5) were produced and evaluated similarly. The results are shown in Table 1.

  Comparing the examples of Table 1 and the comparative example, the magnetic properties were improved and the amorphousness was improved. This is because the flow of the coolant is further rectified by passing through the coolant discharge portion 46, so that the flow of the coolant becomes uniform, a more effective cooling effect is obtained, and there is less powder that is insufficiently cooled. it is conceivable that. Further, when the crystal analysis of the metal powder was performed by powder X-ray diffraction, there was a comparative example having a peak due to the crystal. When compared with the same composition, for the magnetic properties of the metal powder, the comparative example has a larger coercive force than the example, it can be confirmed that the magnetic properties accompanying the amorphization in the example appears significantly, It was confirmed that an excellent cooling effect was obtained in the examples.

  Comparing the above comparative example with the example, the flow of the cooling liquid is rectified without being turbulent even when the pump pressure is high, by using the cooling liquid flow forming section that causes the cooling liquid to flow out in a film shape. As a result, the cooling effect of the metal powder increased, amorphousness could be confirmed even for compositions that could not be produced conventionally, and magnetic properties could be improved.

DESCRIPTION OF SYMBOLS 10 ... Metal powder manufacturing apparatus 20 ... Molten metal supply part 21 ... Molten metal 21 ... Dripping molten metal 22 ... Heat-resistant container 23 ... Discharge port 24 ... Heating coil 26 ... Gas injection part 27 ... Gas injection port 30 ... Cooling part 32 ... cylindrical body 32a ... cylindrical part 32b ... conical part 33 ... inner peripheral wall 34 ... discharge part 35 ... adjusting plate 40 ... cooling liquid flow forming part 40A-40H ... first to eighth cooling liquid forming part 42 ... inflow part 44 ... Outer peripheral part 44a ... Channel side wall 44b ... Channel bottom wall 46 ... Coolant discharge part 50 ... Coolant supply part 50A-50H ... First coolant supply part 60 ... Coolant flow S1-S3 ... First-first 3 cross-sectional areas W1, W2 ... opening width N ... radial direction O ... axial direction P1 ... orthogonal plane V ... concentric circle direction Q ... outflow direction

Claims (9)

A molten metal supply unit for discharging the molten metal;
A cylinder installed below the molten metal supply unit;
A cooling liquid flow forming unit for forming a flow of a cooling liquid for cooling the molten metal discharged from the molten metal supply unit in the cylindrical body,
The cooling liquid flow forming part flows out the cooling liquid in a film shape along the inner peripheral wall of the cylindrical body from the upper part to the lower part in the axial direction of the cylindrical body, and the flow of the cooling liquid into the cylindrical body Forming a metal powder.   The metal powder manufacturing apparatus according to claim 1, wherein the coolant flow forming portion has an outer peripheral portion having a first flow path cross-sectional area.   2. The metal powder according to claim 1, wherein the outer peripheral portion is formed along a plane orthogonal to the axial direction of the cylindrical body and along a concentric direction of the inner peripheral wall of the cylindrical body. manufacturing device. The coolant flow forming part is
An inflow portion having a second flow path cross-sectional area that is narrower than the first flow path cross-sectional area, and allowing the cooling liquid to flow into the outer peripheral portion;
A cooling liquid discharge section that has a third flow path cross-sectional area that is narrower than the first flow path cross-sectional area, and that causes the cooling liquid to flow out in a film form from the outer peripheral portion along the inner peripheral wall. The metal powder manufacturing apparatus according to claim 2 or claim 3, wherein   5. The metal according to claim 4, further comprising a coolant supply unit that is connected to the inflow portion along a direction inclined in the axial direction of the cylindrical body, and that supplies the coolant to the inflow portion. Powder manufacturing equipment.   The cooling liquid flow forming section includes a cooling liquid discharge section that extends along the radial direction of the cylindrical body and allows the cooling liquid to flow out in a film form from the outer peripheral section along the inner peripheral wall. The metal powder manufacturing apparatus according to any one of claims 1 to 5.   The metal powder manufacturing apparatus according to claim 6, wherein the coolant discharge section has a wider opening width on the outer diameter side than on the inner diameter side. The cooling liquid flow forming portion has a first flow path cross-sectional area and has an outer peripheral portion that accumulates the pressure of the cooling liquid,
The outer peripheral portion is formed along a plane orthogonal to the axial direction of the cylindrical body and along a concentric direction of the inner peripheral wall of the cylindrical body,
The metal powder manufacturing apparatus according to any one of claims 4 to 7, wherein the cooling liquid discharge section is arranged along a forming direction of the outer peripheral section. Forming a flow of the coolant along the inner peripheral wall of the cylinder installed below the molten metal supply unit;
Discharging the molten metal from the molten metal supply unit toward the flow of the cooling liquid, and a method for producing a metal powder comprising:
In the step of forming the flow of the cooling liquid, the cooling liquid flows out in the form of a film along the inner peripheral wall of the cylindrical body from the upper part of the cylindrical body downward. Method.

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