KR102178850B1 - Manufacturing apparatus for metal powder and manufacturing method thereof - Google Patents

Abstract

(Task) To provide a metal powder production apparatus capable of producing a high-quality metal powder, and a metal powder production method using the same.
(Solving means) a molten metal supply unit 20 for discharging molten metal, a cylinder 32 provided below the molten metal supply unit 20, and a cooling liquid for cooling the molten metal discharged from the molten metal supply unit 20 It is a metal powder manufacturing apparatus 10 having a cooling liquid layer forming part 36 forming a flow along an inner peripheral surface of a cylinder. The cooling liquid layer forming part 36 has a frame body 38 that changes the flow of the cooling liquid from the inner circumferential surface 33 toward the inner circumferential surface 33 in the radial direction in a flow direction along the inner circumferential surface 33 of the cylindrical body 32.

Description

A metal powder production apparatus and a metal powder production method TECHNICAL FIELD [MANUFACTURING APPARATUS FOR METAL POWDER AND MANUFACTURING METHOD THEREOF}

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 production apparatus for producing metal powder using a so-called gas atomization method and a production method using the apparatus are known. A conventional apparatus includes a molten metal supply container for discharging molten metal, a cylinder provided below the molten metal supply container, and a flow of a cooling liquid for cooling the molten metal discharged from the molten metal supply unit along the inner peripheral surface of the cylinder. It has a cooling liquid layer forming part to form.

The cooling liquid layer forming unit forms a cooling liquid layer by spraying the cooling liquid in a direction tangential to the inner circumferential surface of the cooling cylinder, and causing the cooling liquid to flow down while swirling along the inner circumferential surface of the cooling container. By using a cooling liquid layer, it is expected that a volume can be rapidly cooled and a highly functional metal powder can be produced.

However, in the conventional apparatus, even if the cooling liquid is sprayed toward the tangential direction of the inner circumferential surface of the cooling cylinder, the cooling liquid reflects from the inner circumferential surface of the cylinder and generates a flow from the inner circumferential surface toward the inside in the radial direction. For this reason, in the conventional apparatus, it is difficult to form a coolant layer of uniform thickness by forming waves on the surface along the inner circumferential surface of the cylinder, and to produce a homogeneous (even particle diameter, crystal state, shape, etc.) metal powder. There was a task that it was difficult. In particular, when the flow rate of the coolant is increased or the pressure of a pump that pushes the coolant is increased to increase the speed of the coolant, the tendency becomes stronger.

Japanese Patent Publication No. Hei 11-80812

The present invention has been made in view of such a reality, and an object thereof is to provide a metal powder production apparatus capable of producing a high-quality metal powder, and a metal powder production method using the same.

In order to achieve the above object, the metal powder manufacturing apparatus according to the present invention,

A molten metal supply unit for discharging molten metal;

A cylinder installed below the molten metal supply unit,

As a metal powder manufacturing apparatus having a cooling liquid layer forming portion for forming a flow of a cooling liquid for cooling the molten metal discharged from the molten metal supply unit along the inner peripheral surface of the cylinder,

The cooling liquid layer forming part,

It is characterized in that it has a frame body that changes the flow of the cooling liquid from the inner circumferential surface toward the inside in the radial direction to a flow direction along the inner circumferential surface of the cylindrical body.

In order to achieve the above object, the method of manufacturing a metal powder according to the present invention,

A process of forming a flow of cooling liquid along the inner circumferential surface of the cylinder installed below the molten metal supply unit,

A method for producing metal powder having a step of discharging molten metal from the molten metal supply unit toward the flow of the cooling liquid,

It is characterized in that the flow of the cooling liquid from the inner circumferential surface toward the inside in the radial direction is brought into contact with a frame body provided on the upper portion of the cylindrical body, and is changed to a flow direction along the inner circumferential surface of the cylindrical body.

In the metal powder production apparatus and the metal powder production method according to the present invention, a frame body is provided on the upstream side of a position where the molten metal discharged from the molten metal supply unit contacts the cooling liquid. For this reason, it is possible to suppress the wave of the surface caused by the flow of the cooling liquid from the inner circumferential surface toward the inside in the radial direction, and change the direction to flow along the inner circumferential surface of the cylindrical body. Therefore, even when the flow rate of the cooling liquid is increased or the speed of the cooling liquid is increased, the wave of the flow surface of the cooling liquid flowing from the inner circumferential surface to the radially inward direction along the inner circumferential surface of the cylinder is suppressed, and uniform thickness along the inner circumferential surface of the cylinder It becomes easy to form the cooling liquid layer of, and it becomes possible to produce a high-quality metal powder.

Preferably, the inner diameter of the frame body is smaller than the inner diameter of the inner peripheral surface of the cylindrical body,

A gap between the frame body and the inner circumferential surface constitutes a cooling liquid discharge portion for allowing the cooling liquid to flow along the inner circumferential surface. By configuring in this way, even when the flow rate of the cooling liquid is increased or the speed of the cooling liquid is increased, it becomes easy to form a cooling liquid layer having a uniform thickness along the inner circumferential surface of the cylinder.

The inner diameter of the frame body may be substantially the same toward the lower end in the axial direction of the frame body, but may be configured to be tapered and large. By increasing the inner diameter of the frame body in a tapered shape toward the lower end in the axial direction, a force in the direction of pressing the cooling liquid toward the inner circumferential surface acts, and it becomes easy to form a cooling liquid layer having a uniform thickness along the inner circumferential surface of the cylinder.

Preferably, the frame body is attached above the cylindrical body. By configuring in this way, it becomes easy to arrange the frame body on the upstream side of a position where the molten metal discharged from the molten metal supply unit contacts the cooling liquid.

Preferably, the cooling liquid layer forming part has a spiral flow forming part for helically colliding the cooling liquid toward the frame body. The spiral flow forming portion is formed by attaching a nozzle to the cylinder body for spraying a cooling liquid in the tangential direction of the inner peripheral surface of the cylinder body, for example. By attaching the frame body to the inside of the position where the cooling liquid is discharged from the spiral flow forming portion toward the tangential direction of the inner circumferential surface of the cylinder, it becomes easy to form a cooling liquid layer having a uniform thickness along the inner circumferential surface of the cylinder.

More specifically, the metal powder manufacturing apparatus according to the first aspect of the present invention,

A molten metal supply unit for discharging molten metal;

A cylinder installed below the molten metal supply unit,

As a metal powder manufacturing apparatus having a cooling liquid layer forming portion for forming a flow of a cooling liquid for cooling the molten metal discharged from the molten metal supply unit along the inner peripheral surface of the cylinder,

The cooling liquid layer forming part,

A nozzle that creates a flow of the cooling liquid from the inner circumferential surface toward the inside in a radial direction,

It has a frame body installed on the inner side of the inner circumferential surface in a radial direction, and a flow of the cooling liquid from the nozzle toward the inner side in the radial direction collides and changes in a direction flowing along the inner circumferential surface of the cylinder,

The inner diameter of the frame body is smaller than the inner diameter of the inner peripheral surface of the cylindrical body,

A gap between the frame body and the inner circumferential surface constitutes a cooling liquid discharge part for flowing the cooling liquid along the inner circumferential surface.

The method of manufacturing a metal powder according to the first aspect of the present invention,

A process of forming a flow of cooling liquid along the inner circumferential surface of the cylinder installed below the molten metal supply unit,

A method for producing a metal powder having a step of discharging molten metal from the molten metal supply unit toward the flow of the cooling liquid,

Using the metal powder manufacturing apparatus,

It is characterized in that the flow of the cooling liquid from the inner circumferential surface toward the inside in the radial direction is brought into contact with a frame body provided on the upper portion of the cylindrical body, and is changed to a flow direction along the inner circumferential surface of the cylindrical body.

A metal powder manufacturing apparatus according to a second aspect of the present invention,

A molten metal supply unit for discharging molten metal;

A cylinder installed below the molten metal supply unit,

As a metal powder manufacturing apparatus having a cooling liquid layer forming portion for forming a flow of a cooling liquid for cooling the molten metal discharged from the molten metal supply unit along the inner peripheral surface of the cylinder,

The cooling liquid layer forming part,

A nozzle that creates a spiral flow of the cooling liquid from the inner circumferential surface toward the inside in a radial direction, and a helical flow of the cooling liquid which is installed inside the radial direction of the inner circumferential surface and from the nozzle to the inside in the radial direction collide , Having a frame body that changes in a flowing direction along the inner circumferential surface of the cylindrical body,

The inner diameter of the frame body is smaller than the inner diameter of the inner peripheral surface of the cylindrical body,

A gap between the frame body and the inner circumferential surface constitutes a cooling liquid discharge part for flowing the cooling liquid along the inner circumferential surface.

The method of manufacturing a metal powder according to the second aspect of the present invention,

A process of forming a flow of cooling liquid along the inner circumferential surface of the cylinder installed below the molten metal supply unit,

A method for producing a metal powder having a step of discharging molten metal from the molten metal supply unit toward the flow of the cooling liquid,

Using the metal powder manufacturing apparatus described above,

It is characterized in that the spiral flow of the cooling liquid from the inner circumferential surface toward the inside in the radial direction is brought into contact with a frame body provided on the upper portion of the cylindrical body, and is changed to a flow direction along the inner circumferential surface of the cylindrical body.

1 is a schematic cross-sectional view of an apparatus for manufacturing a metal powder according to an embodiment of the present invention.
2 is a schematic cross-sectional view of a metal powder manufacturing apparatus according to another embodiment of the present invention.
3 is a schematic cross-sectional view of a metal powder manufacturing apparatus according to still another embodiment of the present invention.

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

Embodiment 1

As shown in Fig. 1, in the apparatus 10 for producing metal powder according to an embodiment of the present invention, the molten metal 21 is pulverized by an atomization method (gas atomization method) to form a plurality of metal particles. It is an apparatus for obtaining the composed metal powder. The apparatus 10 includes a molten metal supply unit 20 and a cooling unit 30 disposed below the metal supply unit 20 in the vertical direction. In the drawing, the vertical direction is a direction along the Z axis.

The molten metal supply unit 20 has a heat-resistant container 22 that houses 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 container 22 is heated to maintain the molten state. At the bottom of the container 22, a discharge port 23 is formed, and from there, toward the inner circumferential surface 33 of the cylinder 32 constituting the cooling unit 30, the molten metal 21 is dropped. It is discharged as (21a).

A gas injection nozzle 26 is disposed on the outer periphery of the outer bottom wall of the container 22 so as to surround the discharge port 23. The gas injection nozzle 26 is provided with a gas injection port 27. High-pressure gas is injected from the gas injection port 27 toward the dropping molten metal 21a discharged from the discharge port 23. The high-pressure gas is injected from the entire circumference of the molten metal discharged from the discharge port 23 in an oblique downward direction, and the dropping molten metal 21a becomes a plurality of droplets, and the inner peripheral surface of the cylinder 32 along the gas flow Is moved towards.

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

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, but air may be used as long as the molten metal 21 is hardly oxidized. .

In this embodiment, the axial center O of the cylindrical body 32 is inclined with respect to the vertical line Z at a predetermined angle θ1. The predetermined angle θ1 is not particularly limited, but is preferably 5 to 45 degrees. By setting it as such an angular range, it becomes easy to discharge the dripping molten metal 21a from the discharge port 23 toward the cooling liquid layer 50 formed on the inner peripheral surface 33 of the cylinder body 32.

The dropping molten metal 21a discharged to the cooling liquid layer 50 collides with the cooling liquid layer 50, is further divided and refined, and cooled and solidified to form a solid metal powder. A discharge part 34 is provided below along the axis O of the cylindrical body 32, and metal powder contained in the cooling liquid layer 50 can be discharged to the outside together with the cooling liquid. 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. In addition, the cooling liquid is not particularly limited, but cooling water is used.

In this embodiment, a frame body 38 serving as a cooling liquid layer forming portion is provided above the cylinder body 32 in the axial center (O) direction. The frame body 38 is attached to the upper portion of the cylindrical body 32 by an attachment flange 39 integrally molded therewith. The method of attaching the frame 38 is not particularly limited, and may be integrally molded with the cylindrical body 32. The frame 38 has an inner diameter smaller than the inner diameter of the inner peripheral surface 33 of the cylindrical body 32 and is arranged concentrically with the inner peripheral surface of the cylindrical body 32. In this embodiment, the inner peripheral surface of the frame 38 and the inner peripheral surface of the cylindrical body 32 are arranged substantially parallel.

A nozzle hole (nozzle) 37a serving as a cooling liquid layer forming portion is formed at an upper position of the cylinder 32 corresponding to the frame 38. The nozzle holes 37a are formed continuously (or intermittently) along the circumferential direction so as to open toward the inside of the cylindrical body 32. The nozzle hole 37a is formed so as to face the frame 38 with a predetermined gap. The width of the circumferential gap between the frame 38 and the inner circumferential surface 33 (the width in the radial direction of the coolant discharge portion 52) is not particularly limited, but is determined in relation to the thickness of the coolant layer 50. Further, the width of the gap in the circumferential direction between the frame 38 and the inner peripheral surface 33 may be thinner than the thickness of the cooling liquid layer 50.

The axial length (L1) of the frame body (38) may be a length sufficient to cover the nozzle hole (37a), and the cooling liquid layer (50) having a sufficient axial length (L0) on the inner peripheral surface (33) of the cylinder body (32) The face value of is exposed. It is preferable that the axial length L0 of the cooling liquid layer 50 exposed to the inside is 5 to 500 times longer than the axial length L1 of the frame 38. Further, the inner diameter of the inner peripheral surface 33 of the cylindrical body 32 is not particularly limited, but is preferably 50 to 500 mm.

In this embodiment, the gap between the frame 38 and the inner peripheral surface 33 of the cylindrical body 32 constitutes the cooling liquid discharge portion 52 for allowing the cooling liquid to flow along the inner peripheral surface 33. In this embodiment, a nozzle 37 as a helical flow forming part is connected to an upper portion of the cylinder 32 in the Z-axis direction. By connecting the nozzle 37 in the tangential direction of the cylinder 32, the component from the nozzle 37 to the inside of the cylinder 32, passing through the nozzle hole 37a, and from the inner circumferential surface 33 toward the inside in the radial direction It becomes a helical flow having a, and collides with the inner circumferential surface of the frame body 38, passes through the coolant discharge portion 52, and flows along the inner circumferential surface 33 of the cylindrical body 32.

By the rotational flow (helical flow) of the cooling liquid continuously supplied from the nozzle hole 37a formed on the inner circumferential surface 33 of the cylinder 32 toward the inner circumferential surface of the frame 38 and the gravity of the cooling liquid itself, the cylinder ( The cooling liquid flowing along the inner circumferential surface 33 of 32) becomes a spiral flow to form the cooling liquid layer 50. The dropping molten metal 21a shown in Fig. 1 is incident on the inner circumferential side liquid surface of the cooling liquid layer 50 formed in this way, and the dropping molten metal 21a is mixed with the cooling liquid inside the cooling liquid layer 50 in a spiral flow. Flows together and cools.

In the metal powder production apparatus 10 according to the present embodiment and the metal powder production method using the same, the dropping molten metal 21a discharged from the discharge port 23 of the metal supply unit 20 contacts the cooling liquid layer 50 The frame body 38 is provided on the upstream side of the position. Therefore, the flow of the cooling liquid passing through the nozzle hole 37a and from the inner circumferential surface 33 toward the inside in the radial direction can be changed to a flow along the inner circumferential surface 33 of the cylindrical body 32 . Therefore, even when the flow rate of the cooling liquid is increased or the speed of the cooling liquid is increased, it becomes easy to form the cooling liquid layer 50 of uniform thickness along the inner circumferential surface of the cylinder 32, thereby producing high quality metal powder. It becomes possible to do.

In addition, the inner diameter of the frame 38 is smaller than the inner diameter of the inner circumferential surface 33 of the cylindrical body 32, and the gap between the frame 38 and the inner circumferential surface 33 is a cooling liquid for flowing the cooling liquid along the inner circumferential surface 33 It constitutes the discharge part 52. By constituting in this way, even when the flow rate of the cooling liquid is increased or the speed of the cooling liquid is increased, it becomes easy to form the cooling liquid layer 50 having a uniform thickness along the inner peripheral surface of the cylinder 32.

In addition, in this embodiment, the frame 38 is attached above the axial center O of the cylindrical body 32. By configuring in this way, it becomes easy to arrange the frame body 38 on the upstream side of a position where the molten metal discharged from the metal supply unit 20 contacts the cooling liquid.

In addition, in this embodiment, by attaching the frame body 38 to the inside of the position where the cooling liquid is discharged from the nozzle hole 37a toward the substantially tangential direction of the inner peripheral surface 33 of the cylinder body 32, the inner peripheral surface of the cylinder body 32 It becomes easy to form the cooling liquid layer 50 consisting of a spiral flow of uniform thickness along (33).

In addition, in the above-described embodiment, it collides in a helical flow from the nozzle hole 37a toward the inner circumferential surface of the frame body 38, and the direction of the flow is changed, passing through the cooling liquid discharge portion 52, and the cylinder body 32 It is configured to flow in a spiral along the inner peripheral surface (33). However, in this embodiment, it is not limited to such a flow.

For example, by connecting the nozzle 37 to the outer circumferential surface of the cylinder 32 substantially perpendicularly, the flow toward the inner circumferential surface of the frame 38 from the nozzle hole 37a formed in the inner circumferential surface 33 of the cylinder 32 is , Non-helical flow (helical flow may be mixed in some parts). In that case, the non-helical flow collides with the inner circumferential surface of the frame body 38, the direction of the flow is changed, and is discharged through the coolant discharge portion 52, and the non-helical flow along the inner circumferential surface 33 of the cylinder 32 The cooling layer 50 of is formed.

Second embodiment

As shown in Fig. 2, the metal powder production apparatus 110 and the metal powder production method according to the second embodiment of the present invention are the same as the first embodiment, except for those shown below, and are common to common members. The member names and symbols to be used are given, and the description of the common parts is partially omitted.

In this embodiment, the metal powder manufacturing apparatus 110 has a flow path box 136 continuous in the circumferential direction as a cooling liquid layer forming part in the cooling part 130. The flow path box 136 is attached to the upper portion of the cylinder 32 in the axial center O direction. Inside the flow path box 136, a flow path continuous in the circumferential direction is formed. A plurality of nozzles 137 are connected to the upper portion (or lower portion) of the flow path box 136 in the axial center O direction. These nozzles 137 may be connected inclined with respect to the axial center O from the upper (or lower) of the flow path box 136 to the outer circumferential side so as to form a spiral flow of the cooling liquid inside the flow path box 136 .

Alternatively, these nozzles 137 may be connected parallel to the axis O on the outer circumferential side from the top (or bottom) of the flow path box 136. Alternatively, the nozzle 137 may be connected to the outer peripheral surface of the flow path box 136 so as to form a spiral flow of cooling liquid inside the flow path box 136.

On the inner circumferential side of the flow path box 136, a frame body 138 (corresponding to the frame body 38 shown in Fig. 1) is integrally formed with the flow path box 136. The frame body 138 has an inner diameter smaller than the inner circumferential surface 33 of the cylindrical body 32, and the circumferential gap between the frame body 138 and the inner circumferential surface 33 becomes the cooling liquid discharge portion 52. In this embodiment, the cooling liquid discharge part 52 can be formed by forming a discontinuous hole (the hole may be continuous in the circumferential direction) in the circumferential direction on the lower inner circumferential side of the flow path box 136. The outer diameter of the coolant discharge portion 52 matches the inner diameter of the inner peripheral surface 33, and the inner diameter of the coolant discharge portion 52 matches the inner diameter of the frame body 138.

In this embodiment, the flow of the coolant flowing out of the coolant discharge portion 52 by the flow of the coolant entering the inside of the flow path box 136 from the nozzle 137 becomes a spiral flow along the inner circumferential surface 33 , To form a coolant layer 50. Alternatively, the flow of the cooling liquid flowing out from the cooling liquid discharge portion 52 becomes a flow parallel to the axial center O along the inner circumferential surface 33 to form the cooling liquid layer 50.

In the metal powder production apparatus 110 according to the present embodiment and the metal powder production method using the same, the dropping molten metal 21a discharged from the discharge port 23 of the metal supply unit 20 contacts the cooling liquid layer 50 A frame body 138 is provided on the upstream side of the position. For this reason, the flow of the cooling liquid from the inside of the flow path box 136 toward the inside in the radial direction can be changed by the frame body 138 to a direction flowing along the inner peripheral surface 33 of the cylinder body 32. Therefore, even when the flow rate of the cooling liquid is increased or the speed of the cooling liquid is increased, it becomes easy to form the cooling liquid layer 50 of uniform thickness along the inner circumferential surface of the cylinder 32, thereby producing high quality metal powder. Things become possible.

Embodiment 3

As shown in Fig. 3, the metal powder manufacturing apparatus 210 according to the embodiment of the present invention is the same as the first embodiment or the second embodiment, except for those shown below, and a member common to a common member Names and symbols are given, and descriptions of common parts are partially omitted.

In the embodiments shown in Figs. 1 to 2, the inner diameter of the frame 38 or 138 is substantially the same toward the lower end of the frame 38 or 138 in the axial center O direction, but in this embodiment, the cooling unit 230 ), the lower end portion 238a of the frame body 238 is configured to be tapered toward the lower side along the axis O. In this embodiment, a discontinuous gap (may be continuous) in the circumferential direction between the lower end portion 238a of the frame body 238 constituting the inner circumferential surface of the flow path box 236 and the inner circumferential surface 33 of the cylindrical body 32, It becomes the cooling liquid discharge part 52. Further, a plurality of nozzles 237 are connected to an upper portion (or lower portion) of the flow path box 236 in the axial center O direction.

The taper angle θ2 of the lower tip portion 238a of the frame body 238 with respect to the axis O is not particularly limited, but is preferably 5 to 45 degrees. By increasing the inner diameter of the lower end portion 238a of the frame body 238 in a tapered shape toward the lower end in the axial direction, a force in the direction of pressing the coolant flowing out from the coolant discharge portion 52 toward the inner peripheral surface 33 acts. Thus, it becomes easy to form the cooling liquid layer 50 having a uniform thickness along the inner peripheral surface 33 of the cylindrical body 32.

In addition, the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention.

[Example]

Hereinafter, the present invention will be described based on more detailed examples, but the present invention is not limited to these examples.

Example

Using the metal powder manufacturing apparatus 10 shown in Fig. 1, Fe-Si-B (Experiment No. 6), Fe-Si-Nb-B-Cu (Experiment No. 7), Fe-Si-BP-Cu (Experiment No. 8), Fe-Nb-B (Experiment No. 9), and Fe-Zr-B (Experiment No. 10) to prepare a metal powder.

In each experiment, the dissolution temperature: 1500° C., the injection gas pressure: 5 MPa, the gas type used: argon were kept constant, and the spiral water flow conditions were 7.5 kPa at the pump pressure. In Examples, a metal powder having an average particle diameter of about 25 μm could be prepared. The average particle diameter was measured and calculated using a dry particle size distribution measuring device (HELLOS). Moreover, the crystal analysis of the metal powder produced in Experiment Nos. 6-10 was evaluated by powder X-ray diffraction method. The magnetic properties of the metal powder were measured by measuring the coercive force (Oe) with an Hc meter. Table 1 shows the results. Further, the thickness of the cooling liquid layer 50 was 30 mm, and it was observed that the non-uniformity was small in the direction of the axis O.

Comparative example

Except having not provided the frame 38, the same metal powder production apparatus as the Example was used, in the same manner as the Example, metal powder (Experiment Nos. 1 to 5) was produced, and the same evaluation was performed. Table 1 shows the results. The thickness of the cooling liquid layer 50 was 30 mm, and it was observed that the non-uniformity was large in the direction of the axis O.

When comparing the Example and Comparative Example in Table 1, magnetic properties were improved, and thus amorphousness was improved. This is considered to be due to the fact that a uniform cooling effect is obtained by suppressing the undulation of the surface of the spiral water stream, and there are few powders that are insufficient for cooling. Further, when the crystal analysis of the metal powder was performed by powder X-ray diffraction, there was also a comparative example having a peak attributable to the crystal. As for the magnetic properties of the metal powder, it can be seen that more uniform cooling effects are obtained from the fact that the comparative examples all have higher coercivity than the examples and the examples are superior.

Comparing the Comparative Examples and Examples, it was confirmed that amorphousness can be confirmed even for a composition that could not be produced in the past, and magnetic properties can also be improved. This makes it possible to suppress the wave of the surface of the flow of the coolant from the nozzle hole of the inner circumferential surface toward the radially inward direction even in a state where the pump pressure is high by providing the frame 38, thereby preventing the flow of the coolant along the inner circumferential surface. It is considered that it is due to rectification and obtaining a uniform cooling effect.

10, 110, 210: metal powder manufacturing apparatus 20: molten metal supply unit
21: molten metal 22: container
23: discharge port 24: heating coil
26: gas injection nozzle 27: gas injection port
30, 130, 230: cooling unit 32: cylinder
33: inner surface 34: discharge unit
37: nozzle 37a: nozzle hole
136, 236: Euro box 137, 237: nozzle
38, 138, 238: frame body 238a: frame tip
39: attachment flange 50: coolant layer
52: coolant discharge part

Claims (6)

A molten metal supply unit 20 for discharging molten metal,
A cylinder 32 installed below the molten metal supply unit 20,
As a metal powder manufacturing apparatus having a cooling liquid layer forming portion forming a flow of a cooling liquid for cooling the molten metal discharged from the molten metal supply unit 20 along the inner circumferential surface 33 of the cylinder 32,
The cooling liquid layer forming part,
A nozzle hole 37a for creating a flow of the cooling liquid from the inner circumferential surface 33 toward the inside in the radial direction,
It is provided inside the radial direction of the inner circumferential surface 33 so as to cover the nozzle hole 37a formed on the inner circumferential surface 33 of the cylindrical body 32, and radially inside the nozzle hole 37a. It has a frame body (38, 138, 238) that is changed in a direction in which the flow of the cooling liquid directed toward it collides and flows along the inner peripheral surface (33) of the cylinder body (32),
The frame bodies 38, 138, 238 are arranged to have a predetermined gap from the inner circumferential surface 33 of the cylinder body 32 in which the nozzle hole 37a is formed, and the inner diameter of the frame body is the cylinder body ( 32) has an inner diameter smaller than the inner diameter of the inner circumferential surface 33, and is arranged concentrically with the inner circumferential surface 33 of the cylindrical body 32,
Metal powder manufacturing, characterized in that the gap between the frame bodies 38, 138, 238 and the inner circumferential surface 33 constitutes a cooling liquid discharge portion 52 for flowing the cooling liquid along the inner circumferential surface 33 Device. The method according to claim 1,
The metal powder manufacturing apparatus, wherein the inner diameter of the frame bodies (38, 138, 238) is tapered toward the lower end in the axial direction of the frame bodies (38, 138, 238). The method according to claim 1 or 2,
The frame body (38, 138, 238) is provided above along the axial direction of the cylindrical body (32), a metal powder manufacturing apparatus. A molten metal supply unit 20 for discharging molten metal,
A cylinder 32 installed below the molten metal supply unit 20,
As a metal powder manufacturing apparatus having a cooling liquid layer forming portion forming a flow of a cooling liquid for cooling the molten metal discharged from the molten metal supply unit 20 along the inner circumferential surface 33 of the cylinder 32,
The cooling liquid layer forming part,
A nozzle hole 37a for creating a spiral flow of the cooling liquid from the inner circumferential surface 33 toward the inside in the radial direction,
The spiral flow of the cooling liquid is installed radially inside the inner circumferential surface 33 so as to cover the nozzle hole 37a and goes radially inward from the nozzle hole 37a, and the cylinder body ( 32) has a frame body (38, 138, 238) that changes in a flowing direction along the inner peripheral surface (33)
The frame bodies 38, 138, 238 are arranged to have a predetermined gap from the inner circumferential surface 33 of the cylinder body 32 in which the nozzle hole 37a is formed, and the inner diameter of the frame body is the cylinder body ( 32) has an inner diameter smaller than the inner diameter of the inner circumferential surface 33, and is arranged concentrically with the inner circumferential surface 33 of the cylindrical body 32,
Metal powder manufacturing, characterized in that the gap between the frame bodies 38, 138, 238 and the inner circumferential surface 33 constitutes a cooling liquid discharge portion 52 for flowing the cooling liquid along the inner circumferential surface 33 Device. A process of forming a flow of a cooling liquid along the inner circumferential surface 33 of the cylinder 32 installed below the molten metal supply unit 20,
As a method for producing metal powder having a step of discharging molten metal from the molten metal supply unit 20 toward the flow of the cooling liquid,
Using the metal powder production apparatus according to claim 1 or 2,
The flow of the cooling liquid from the inner circumferential surface 33 toward the inside in the radial direction is brought into contact with the frame bodies 38, 138 and 238 provided on the upper portion of the cylinder 32, and the inner circumferential surface of the cylinder 32 ( 33), the method for producing a metal powder, characterized in that the flow direction is changed. A process of forming a flow of a cooling liquid along the inner circumferential surface 33 of the cylinder 32 installed below the molten metal supply unit 20,
As a method for producing metal powder having a step of discharging molten metal from the molten metal supply unit 20 toward the flow of the cooling liquid,
Using the metal powder production apparatus according to claim 4,
The spiral flow of the cooling liquid from the inner circumferential surface (33) toward the inside in the radial direction is brought into contact with the frame bodies (38, 138, 238) provided on the upper portion of the cylinder body (32), and the A method for producing a metal powder, characterized in that changing the direction of flowing along the inner circumferential surface (33).

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