GB2565654A - Manufacturing apparatus for metal powder and manufacturing method thereof - Google Patents
Manufacturing apparatus for metal powder and manufacturing method thereof Download PDFInfo
- Publication number
- GB2565654A GB2565654A GB1812898.3A GB201812898A GB2565654A GB 2565654 A GB2565654 A GB 2565654A GB 201812898 A GB201812898 A GB 201812898A GB 2565654 A GB2565654 A GB 2565654A
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- cooling liquid
- inner circumference
- flow
- circumference face
- cylinder body
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0824—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0844—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid in controlled atmosphere
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/086—Cooling after atomisation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/086—Cooling after atomisation
- B22F2009/0864—Cooling after atomisation by oil, other non-aqueous fluid or fluid-bed cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/086—Cooling after atomisation
- B22F2009/0872—Cooling after atomisation by water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
Abstract
A metal powder producing apparatus 10 comprising a cylinder body 32 provided beneath a molten metal supply 20, and a cooling liquid layer forming part providing a flow of cooling liquid 50 along an inner face of the cylinder. The cooling liquid layer forming part comprises a nozzle 37 forming a flow of liquid towards the inner side of a radial direction from the inner cylinder face, and a frame 38 provided to the inner cylinder face 33 with which the flow of liquid collides in order to change flow direction from radial to along the inner face 33. The inner diameter of the frame 38 is smaller than that of the inner face 33 but may increase in a tapered form towards the axially lower end of the frame. Cooling liquid discharges from the gap 52 between the frame 38 and face 33. The frame 38 may be provided on an upper part of the cylinder body 32. A metal powder producing apparatus as described but where the nozzle forms a spiral flow of cooling liquid is disclosed. Methods of producing metal powder using both apparatus are disclosed.
Description
MANUFACTURING APPARATUS FOR METAL POWDER AND
MANUFACTURING METHOD THEREOF
THECHNICAL FIELD [0001]
The present invention relates to a metal powder producing apparatus and the method of producing a metal powder.
BACKGROUND [0002]
The metal powder producing apparatus and the production method using the apparatus for producing the metal powder which uses so called gas atomization method is known, for example as shown in Patent Document 1. The conventional apparatus has a melted metal supplying container which discharges the melted metal, a cylinder body provided below this melted metal supplying container, and a cooling liquid layer forming part which forms a flow of a cooling liquid along an inner circumference face of the cylinder body for cooling the melted metal discharged from the melted metal supplying part.
[0003]
The cooling liquid layer forming part sprays the cooling liquid towards a tangent line direction of the inner circumference face of a cooling cylinder body, then the cooling liquid flows down while spiraling along the inner circumference face of the cooling container, thereby the cooling liquid layer is formed. By using the cooling liquid layer, a melted drop is rapidly cooled, and the metal powder having a high functionality is expected to be produced.
[0004]
- 1 However, for the conventional apparatus, even if the cooling liquid is sprayed towards the tangent line direction of the inner circumference face of the cooling cylinder body, the cooling liquid collides and rebounds at the inner circumference face of the cylinder body, and the flow running to the inner side of the radius direction from the inner circumference face is generated. Therefore, for the conventional apparatus, it was difficult to make the cooling liquid layer forming a wave on the surface and having uniform thickness along the inner face of the cylinder body, thus it was difficult to produce the metal powder having uniform quality (uniform particle size, crystallinity, and shape or so). Particularly, such tendency was prominent when the flow amount of the cooling liquid was increased, and the speed of the cooling liquid was increased by increasing the pressure of a pushing pump.
[0005] [Patent Document 1] JP Patent Application Laid Open No. Hll-80812 SUMMARY [0006]
The present invention is attained in view of such circumstance, and the object is to provide the metal powder producing apparatus capable of producing high quality metal powder, and the method of producing the metal powder using the apparatus.
[0007]
In order to attain the above object, the metal powder producing apparatus according to the present invention has a melted metal supplying part discharging a melted metal, a cylinder body provided below the melted metal supplying part, and
-2a cooling liquid layer forming part forming a flow of a cooling liquid for cooling the melted metal discharged from the melted metal supplying part along an inner circumference face of the cylinder body, wherein the cooling liquid layer forming part has a frame to change the flow of the cooling liquid moving from the inner circumference face towards the inner side of a radial direction into the flow of the cooling liquid moving along the inner circumference face of the cylinder body.
[0008]
In order to attain the above object, the method of producing the metal powder according to the present invention has steps of forming a flow of a cooling liquid along an inner circumference face of a cylinder body provided below a melted metal supplying part, and discharging a melted metal from the melted metal supplying part towards the flow of the cooling liquid, wherein the flow of the cooling liquid moving from the inner circumference face towards the inner side of the radial direction collides against the frame provided on an upper part of the cylinder body to change the flow of the cooling liquid into the cooling liquid moving along the inner circumference face of the cylinder body.
[0009]
In the metal powder producing apparatus according to the present invention and the method of producing the metal powder, the frame is provided at the upstream side of the position where the melted metal discharged from the melted metal supplying part contacts with the cooling liquid. Therefore, the wave on the surface generated by the flow of the cooling liquid moving from the inner circumference face towards the inner side of the
-3 radial direction is suppressed, and the flow of the cooling liquid can be changed into the flow moving along the inner circumference face of the cylinder body. Thus, even when the flow amount of the cooling liquid is increased or the flow speed of the cooling liquid is increased, the wave on the surface of the cooling liquid moving from the inner circumference face of the cylinder body towards the inner side of the radial direction can be suppressed, and the cooling liquid layer having an uniform thickness along the inner circumference face of the cylinder body can be easily formed. Hence, the high quality metal powder can be produced.
[0010]
Preferably, the inner diameter of the frame is smaller than the inner diameter of the inner circumference face of the cylinder body, and the space between the frame and the inner circumference face constitutes the cooling liquid discharging part for moving the cooling liquid along the inner circumference face. By constituting as such, even when the flow amount of the cooling liquid is increased or the flow speed of the cooling liquid is increased, the cooling liquid layer having an uniform thickness along the inner circumference face of the cylinder body can be easily formed.
[0011]
The inner diameter of the frame may be about the same towards a lower end of the frame in the axial direction, and also it may become larger towards the lower end in a taper form. By making the inner diameter of the frame larger towards the lower end in the axial direction in a taper form, the force pressing the cooling liquid to the inner circumference face acts, and the cooling liquid layer having a uniform thickness along the inner circumference face of the cylinder body can be easily formed.
-4[0012]
Preferably, the frame is installed to the upper part of the cylinder body. By constituting as such, the frame can be easily placed to the upstream side of the position where the melted metal discharged from the melted metal supplying part contacts with the cooling liquid.
[0013]
Preferably, the cooling liquid layer forming part has a spiral flow forming part to collide the cooling liquid in a spiral flow to the frame. For example, the nozzle which sprays the cooling liquid to the tangent line direction of the inner circumference face of the cylinder body is provided to the cylinder body, thereby the spiral flow forming part can be formed. The frame is provided to the inner side of the position where the cooling liquid is discharged from the spiral flow forming part towards the tangent line direction of the inner circumference face of the cylinder body, thereby the cooling liquid layer having a uniform thickness along the inner circumference face of the cylinder body can be easily formed.
[0014]
Further specifically, the metal powder producing apparatus according to the first aspect of the present invention has, a melted metal supplying part discharging a melted metal, a cylinder body provided below the melted metal supplying part, and a cooling liquid layer forming part forming a flow of a cooling liquid for cooling the melted metal discharged from the melted metal supplying part along an inner circumference face of the cylinder body, wherein the cooling liquid layer forming part has a nozzle forming the flow of the cooling liquid towards an inner side
-5of a radial direction from the inner circumference face, and a frame provided to the inner side of a radial direction of the inner circumference face for colliding the cooling liquid against the frame to change the flow of the cooling liquid moving from the nozzle towards the inner side of the radial direction into the flow of the cooling liquid moving along the inner circumference face of the cylinder body, and wherein an inner diameter of the frame is smaller than an inner diameter of the inner circumference face of the cylinder body, and a space between the frame and the inner circumference face forms a cooling liquid discharging part to move the cooling liquid along the inner circumference face.
[0015]
The method of producing the metal powder according to the first aspect of the present invention has steps of forming a flow of a cooling liquid along an inner circumference face of a cylinder body provided below a melted metal supplying part, and discharging a melted metal from the melted metal supplying part towards the flow of the cooling liquid, wherein the metal powder producing apparatus described in the above is used to collide the flow of the cooling liquid moving from the inner circumference face towards the inner side of the radial direction against the frame provided on an upper part of the cylinder body to change the flow of the cooling liquid into the cooling liquid moving along the inner circumference face of the cylinder body.
[0016]
The metal powder producing apparatus according to the second aspect of the present invention has
-6a melted metal supplying part discharging a melted metal, a cylinder body provided below the melted metal supplying part, and a cooling liquid layer forming part forming a flow of a cooling liquid for cooling the melted metal discharged from the melted metal supplying part along an inner circumference face of the cylinder body, wherein the cooling liquid layer forming part has a nozzle forming a spiral flow of the cooling liquid towards an inner side of a radial direction from the inner circumference face, and a frame provided to the inner side of a radial direction of the inner circumference face for colliding the spiral flow of the cooling liquid against the frame to change the flow of the cooling liquid moving from the nozzle towards the inner side of a radial direction into the flow of the cooling liquid moving along the inner circumference face of the cylinder body, wherein an inner diameter of the frame is smaller than an inner diameter of the inner circumference face of the cylinder body, and a space between the frame and the inner circumference face forms a cooling liquid discharging part to move the cooling liquid along the inner circumference face.
[0017]
The method of producing the metal powder according to the second aspect of the present invention has steps of forming a flow of a cooling liquid along an inner circumference face of a cylinder body provided below a melted metal supplying part, and discharging a melted metal from the melted metal supplying part towards the flow of the cooling liquid, wherein the metal powder producing apparatus mentioned in the above is used to collide the spiral flow of the cooling liquid moving from the inner
-7circumference face towards the inner side of the radial direction against the frame provided on an upper part of the cylinder body to change the spiral flow of the cooling liquid into the cooling liquid moving along the inner circumference face of the cylinder body.
BRIEF DESCRIPTION OF DRAWINGS [0018] [Fig.l] Fig.l is a schematic cross section of the metal powder producing apparatus according to one embodiment of the present invention.
[Fig.2] Fig.2 is a schematic cross section of the metal powder producing apparatus according other embodiment of the present invention.
[Fig.3] Fig.3 is a schematic cross section of the metal powder producing apparatus according to further other embodiment of the present invention.
DETAILED EMBODIMENT [0019]
Hereinafter, the present invention will be described based on the embodiment shown in the figures.
[0020]
First Embodiment
As shown in Fig.l, the metal powder producing apparatus 10 according to one embodiment of the present invention forms the melted metal 21 into a powder by an atomization method (gas atomization method), and the metal powder constituted from many metal particles is obtained. This apparatus 10 has the melted metal supplying part 20, and the cooling part 30 placed at the bottom in a vertical direction of the metal supplying part 20. In the figure, the vertical direction is the direction along Z axis.
-8[0021]
The melted metal supplying part 20 has a heat resistance container 22 which contains the melted metal 21. A heating coil 24 is placed at the outer circumference of the heat resistance container 22, hence the heat resistance container 22 contains the melted metal 21 while heating and keeping it in a melted condition. At a base part of the heat resistance container 22, a discharge opening 23 is formed, and the melted metal 21 is discharged as a melted metal drop 21a towards the inner circumference face 33 of the cylinder body 32 constituting the cooling part 30.
[0022]
At the outer circumference part of the bottom outer wall of the heat resistance container 22, a gas spraying nozzle 26 is placed around the discharge opening 23. At the gas spraying nozzle 26, the gas spraying opening 27 is formed. A high pressure gas is sprayed from the gas spraying opening 27 towards the melted metal drop 21a discharged from the discharge opening 23. The high pressure gas is sprayed diagonally downward to the entire circumference of the melted metal discharged from the discharge opening 23, and the melted metal drop 21a is formed into many liquid drops, then these move towards the inner circumference face of the cylinder body 32 along the flow of the gas.
[0023]
The melted metal 21 may include any elements, and for example at least one selected from the group consisting of Ti, Fe, Si, B, Cr, P, Cu, Nb, and Zr can be included. These elements are highly active, and the melted metal 21 including these elements is easily oxidized by contacting air for short period of time and forms an oxide film, hence it was difficult to make a
-9fine powder. The metal powder producing apparatus 10 uses inactive gas as the gas sprayed from the gas spraying opening 27 of the gas spraying nozzle 26 as mentioned in above, hence even in case of the melted metal 21 which is easily oxidized, it can be easily formed into powder.
[0024]
As the gas sprayed from the gas spraying opening 27, an inactive gas such as nitrogen gas, argon gas, helium gas or so, or a reducing gas such as ammonia decomposition gas or so are preferable, but if the melted metal 21 is a metal which hardly oxidize, then it may be air.
[0025]
In the present embodiment, the center axis O of the cylinder body 32 is tilted by a predetermine angle Θ1 with respect to the vertical line Z. This predetermine angle Θ1 is not particularly limited, and preferably it is 5 to 45 degrees. By having the angle within this range, the melted metal drop 21a can be easily discharged from the discharge opening 23 to the cooling liquid layer 50 formed on the inner circumference face 33 of the cylinder body 32.
[0026]
The melted metal drop 21a discharged to the cooling liquid layer 50 collides with the cooling liquid layer 50, then fragmented and refined. Also, at the same time it is solidified by cooling, and forms solid metal powder. At the lower side along the center axis O of the cylinder body 32, the discharge part 34 is provided, and the metal powder included in the cooling liquid layer 50 can be discharged to outside together with the cooling liquid. The metal powder discharged together with the cooling liquid is separated from the cooling liquid by external reservoir and then removed. Note that, the cooling liquid is not particularly limited, and the cooling water may be used.
-10[0027]
In the present embodiment, the frame 38 as the cooling liquid layer forming part is provided to the upper part of the cylinder body 32 in the center axis O direction. The frame 38 is integrally formed with the installation flange 39, thereby the frame 38 is provided to the upper part of the cylinder body 32. The method of providing the frame 38 is not particularly limited, and it may be integrally formed with the cylinder body 32. The frame 38 has a smaller inner diameter than the inner diameter of the inner circumference face 33 of the cylinder body 32, and the frame 38 is placed concentrically with the inner circumference face of the cylinder body 32. In the present embodiment, the inner circumference face of the frame 38 and the inner circumference of the cylinder body 32 are placed approximately parallel to each other.
[0028]
A nozzle hole (nozzle) 37a as the cooling liquid layer forming part is formed on the upper part of the cylinder body 32 which corresponds to the frame 38. The nozzle hole 37a is formed continuously (it may also be formed discontinuously or sporadically) along the circumference direction, and opened towards the inner side of the cylinder body 32. The nozzle hole 37a is formed so as to face against the frame 38 while taking predetermined space with the frame 38. The width of the circumference direction space between the frame 38 and the inner circumference face 33 is not particularly limited, and it is determined in relation with the thickness of the cooling liquid layer 50. Also, the width of the circumference direction space between the frame 38 and the inner circumference face 33 may be thinner than the cooling liquid layer 50.
[0029]
-11 The axial direction length LI of the frame 38 may be about the length which covers the nozzle hole 37a, and the liquid surface of the cooling liquid layer 50 having sufficient axial direction length L0 is exposed to the inner circumference face 33 of the cylinder body 32. The axial direction length L0 of the cooling liquid layer 50 exposed to the inner side is preferably 5 to 500 times longer than the axial direction length LI of the frame 38. Also, the inner diameter of the inner circumference face 33 of the cylinder body 32 is not particularly limited, and preferably it is 50 to 500 mm.
[0030]
In the present embodiment, the space between the frame 38 and the inner circumference face 33 of the cylinder body 32 constitutes the cooling liquid discharging part 52 to flow the cooling liquid along the inner circumference face 33. In the present embodiment, the nozzle 37 as a spiral flow forming part is continuously connected to the upper part of the cylinder body 32 in Z axis direction. By connecting the nozzle 37 in a tangent line direction of the cylinder body 32, the spiral flow from the inner circumference face 33 to the inner side of the radial direction through the nozzle hole 37a is formed at the inside of the cylinder body 32, and the cooling liquid collides against the inner circumference face of the frame 38, then the flow of the cooling liquid is changed into a flow moving along the inner circumference face 33 of the cylinder body 32 through the cooling liquid discharging part 52. [0031]
Due to the rotating flow (spiral flow) of the cooling liquid continuously supplied from the nozzle opening 37a formed on the inner circumference face 33 of the cylinder body 32 towards the inner circumference face of the frame 38, and the gravity of the cooling liquid itself,
-12the cooling liquid moving along the inner circumference face 33 of the cylinder body 32 forms a spiral flow, thereby the cooling liquid layer 50 is formed. The melted metal drop 21a shown in Fig.l enters to the inner circumference side liquid surface of the cooling liquid layer 50 formed as such, and the melted metal drop 21a is cooled while flowing together with the cooling liquid in the cooling liquid layer 50 which has a spiral flow.
[0032]
In the metal powder producing apparatus 10 according to the present embodiment and the method of producing the metal powder, the frame 38 is provided to the upstream side of the position where the melted metal drop 21a discharged from the melted metal supplying part 20 contacts the cooling liquid. Thus, the flow of the cooling liquid from the inner circumference face 33 towards the inner side of the radial direction through the nozzle hole 37a can be changed into a flow of the cooling liquid moving along the inner circumference face 33 of the cylinder body 32 by the frame 38. Therefore, even in case the flow amount of the cooling liquid is increased or the speed of the cooling liquid is increased, the cooling liquid layer 50 having uniform thickness can be easily formed along the inner circumference face 33 of the cylinder body 32, and high quality metal powder can be produced.
[0033]
Also, the inner diameter of the frame 38 is smaller than the inner diameter of the inner circumference face 33 of the cylinder body 32, and the space between the frame 38 and the inner circumference face 33 constitutes the cooling liquid discharging part 52 to flow the cooling liquid along the inner circumference face 33. By constituting as such, even in case the flow amount of the cooling liquid is increased or the speed of the cooling liquid is
-13 increased, the cooling liquid layer 50 having uniform thickness along the inner circumference face 33 of the cylinder body 32 can be easily formed, and high quality metal powder can be produced.
[0034]
Further, in the present embodiment, the frame 38 is provided to the upper part of the cylinder body 32 in the center axis O direction. By constituting as such, the frame 38 can be easily placed to the upstream side of the position where the melted metal discharged from the melted metal supplying part 20 contacts the cooling liquid.
[0035]
Furthermore, in the present embodiment, the frame 38 is provided to the inner side of the position where the cooling liquid is discharged from the nozzle hole 37a towards approximately tangent line direction of the inner circumference face 33 of the cylinder body 32, thereby the cooling liquid of a spiral flow having uniform thickness along the inner circumference face 33 of the cylinder body 32 can be easily formed.
[0036]
Note that, in the above mentioned embodiment, the cooling liquid of a spiral flow moves from the nozzle hole 37a towards the inner circumference face of the frame 38 and collides against the frame 38, then changes the direction of the flow and forms a spiral flow along the inner circumference face 33 of the cylinder body 32 through the cooling liquid discharging part 52. However, the present embodiment is not to be limited to such flow.
[0037]
For example, by connecting the nozzle 37 approximately perpendicular to the outer circumference face of the cylinder body 32, the
-14flow of the cooling liquid from the nozzle hole 37a formed to the inner circumference face 33 of the cylinder body 32 towards the inner circumference face of the frame 38 may be a non-spiral flow (a spiral flow may be formed partially). In such case, the non-spiral flow collides against the inner circumference face of the frame 38 and changes the direction of the flow, and the cooling liquid is discharged through the cooling liquid discharging part 52, then the cooling liquid layer 50 of non-spiral flow is formed along the inner circumference face 33 of the cylinder body 32.
[0038]
Second Embodiment
As shown in Fig.2, the metal powder producing apparatus 110 according to the second embodiment of the present invention and the method of producing the metal powder is same as the first embodiment except for described in below, and the same members are given with the same names. The explanation of the same parts will be omitted.
[0039]
For the present embodiment, in the cooling part 130, the metal powder producing apparatus 110 has a flow passage box 136 which is continuous in circumference direction as the cooling liquid layer forming part. The flow passage part 136 is provided to the upper part of the cylinder body 32 in the center axis O direction. At the inside of the flow passage box 136, the flow passage continuous in the circumference direction is formed. Plurality of nozzles 137 are connected to the upper part (or lower part) in the center axis O direction of this flow passage box 136. These nozzles 137 may be connected at the outer circumference side by tilting towards the center axis O to the upper part (or lower part) of the flow passage box 136 so to form a spiral flow
-15 of the cooling liquid at the inside of the flow passage box 136.
[0040]
Alternatively, these nozzles 137 may be connected at the outer circumference side in parallel with respect to the center axis O to the upper part (or lower part) of the flow passage box 136. Alternatively, the nozzles
137 may be connected to the outer circumference face of the flow passage box 136 so to form a spiral flow of the cooling liquid at the inside of the flow passage box 136.
[0041]
At the inner circumference side of the flow passage box 136, the frame
138 (corresponds to the frame 38 shown in Fig.l) is integrally formed with the flow passage box 136. The frame 138 has smaller inner diameter than the inner diameter of the inner circumference face 33 of the cylinder body 32, and the space between the frame 138 and the inner circumference face 33 forms the cooling liquid discharging part 52. In the present embodiment, discontinuous holes in the circumference direction (or it may be continuous holes in the circumference direction) are formed to the lower inner circumference side of the flow passage box 136, thereby the cooling liquid discharging part 52 can be formed. The outer diameter of the cooling liquid discharging part 52 matches with the inner diameter of the inner circumference face 33, and the inner diameter of the cooling liquid discharging part 52 matches with the inner diameter of the frame 138.
[0042]
In the present embodiment, due to the flow of the cooling liquid entering from the nozzle 137 to the inside of the flow passage box 136, the flow of the cooling liquid discharged from the cooling liquid discharging part
-1652 forms a spiral flow along the inner circumference face 33, and the cooling liquid layer 50 is formed. Alternatively, the flow of the cooling liquid discharged from the cooling liquid discharging part 52 forms a parallel flow with respect to the center axis O along the inner circumference face 33, and the cooling liquid layer 50 is formed.
[0043]
In the metal powder producing apparatus 110 according to the present embodiment and the method of producing the metal powder using the apparatus, the frame 138 is provided to the upstream side of the position where the melted metal drop 21a discharged from the discharge opening 23 of the melted metal supplying part 20 contacts with the cooling liquid layer 50. Therefore, the flow of the cooling liquid moving towards the inner side of the radial direction at the inside of the flow passage box 136 can be changed into the flow which moves along the inner circumference face 33 of the cylinder body 32 by the frame 138. Hence, even in case the flow amount of the cooling liquid is increased or the speed of the cooling liquid is increased, the cooling liquid layer 50 having uniform thickness can be easily formed along the inner circumference face of the cylinder body 32, and high quality metal powder can be produced.
[0044]
Third Embodiment
As shown in Fig.3, the metal powder producing apparatus 210 according to one embodiment of the present invention is same as the first and second embodiments except for described in below, and the same members are given with the same names. The explanation of the same parts will be omitted. [0045]
-17In the embodiment shown in Fig.l and Fig.2, the inner diameter of the frame 38 or 138 is about the same to the lower end of the frame 38 or 138 in center axis O direction; but in the present embodiment, for the cooling part 230, the lower end part 238a of the frame 238 is constituted in a taper form so that it becomes larger towards the end. In the present embodiment, the discontinuous space (or continuous space) in circumference direction between the inner circumference face 33 of the cylinder body 32 and the lower end part 238a of the frame 238 constituting the inner circumference face of the flow passage box 236 forms the cooling liquid discharging part 52. Note that, plurality of nozzles 237 are connected to the upper part (or lower part) in the center axis O direction of this flow passage box 236.
[0046]
The taper angle Θ2 of the lower end part 238a of the frame 238 with respect to the center axis O is not particularly limited; and preferably it is 5 to 45 degrees. By making the inner diameter of the lower end part 238a of the frame 238 larger in a taper form towards the lower end in axial direction, the force pressing the cooling liquid flowing out from the cooling liquid discharging part 52 to the inner circumference face 33 acts, hence the cooling liquid layer 50 having uniform thickness along the inner circumference face 33 of the cylinder body 32 can be easily formed.
[0047]
Note that, the present invention is not limited to the above mentioned embodiments and it can be variously modified within the scope of the present invention.
EXAMPLE [0048]
-18 The present invention will be described by referring to the detailed examples, but the present invention is not to be limited to these examples. [0049] Example
Using the metal powder producing apparatus 10 shown in Fig.l, the metal powder having 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.
[0050]
In each experiment, a melting temperature was 1500°C, a gas spraying pressure was 5 MPa, and a type of gas used was Argon. As the spiral flow condition, a pump pressure was 7.5 kPa. The metal powder having an average particle size of about 25 pm was produced in the experiments. The average particle size was measured using a dry particle size distribution measuring device (HELLOS). Also, the crystal structure analysis of the metal powders produced by the experiments No.6 to 10 was evaluated by a powder X ray diffraction method. The magnetic characteristic of the metal powder was measured by a coercivity (Oe) using He meter. The results are shown in Table
1. Also, the thickness of the cooling liquid layer 50 was 30 mm, and unevenness of the thickness in the center axis O direction was small.
[0051]
Comparative example
The metal powder (Experiments No. 1 to 5) was produced as same as the examples using the same metal powder producing apparatus as the examples except for not providing the frame 38, then the same evaluations as the examples were carried out. The results are shown in Table 1. The thickness
-19of the cooling liquid layer 50 was 30 mm, and unevenness of the thickness in the center axis O direction was large.
[0052]
According to the comparison between the examples and the comparative examples shown in Table 1, the examples had improved magnetic characteristic and improved amorphous property. This is because the wave of the surface of the spiral flow was suppressed, and further uniform cooling effect was obtained, and only small amount of the powder which was not cooled enough was produced. Also, the crystal structure analysis of the metal powder was carried out by the powder X ray diffraction analysis, and some comparative examples had a peak derived from the crystal. Regarding the magnetic characteristic of the metal powder, all of the comparative examples had larger coercivity than the examples, hence it can be confirmed that the examples were better than the comparative examples, and even more uniform cooling effect can be confirmed.
[0053]
According to the comparison between the comparative examples and the examples, the amorphous property can be confirmed for the composition which was conventionally unable to produce, and the magnetic characteristic was further improved. By having the frame 38, even when the pump pressure was high, the wave of the surface of the cooling liquid flow from the nozzle hole of the inner circumference face of the cylinder body towards the inner side of the radial direction can be suppressed, and the flow of the cooling liquid along the inner circumference face is regulated, thereby uniform cooling effect can be obtained. This is thought to be the reason of above mentioned amorphous property and improved magnetic characteristic.
-20[0054] [Table 1]
| Experiment No. | Example/ Comparative example | Composition | paritcle size (pm) | Crystal structure | Coercivity (Oe) |
| 1 | Comparative example | Fe75SiioBi5 | 25.3 | Amorphous/ Crystal | 5.6 |
| 2 | Comparative example | F673.5Sii3.5BgNb3CUi | 25.4 | Amorphous/ Crystal | 10.2 |
| 3 | Comparative example | Fe83.3Si4BsP4CUo .7 | 25.8 | Crystal | 170 |
| 4 | Comparative example | F684Nb7Bg | 25.9 | Crystal | 180 |
| 5 | Comparative example | Fe90Zr7B3 | 25.6 | Crystal | 253 |
| 6 | Example | Fe75SiioBi5 | 25.4 | Amorphous | 0.36 |
| 7 | Example | F673.5Sii3.5BgNb3CUi | 25.8 | Amorphous | 1.41 |
| 8 | Example | Fe83.3Si4B8P4Cuo.7 | 25.7 | Amorphous | 1.77 |
| 9 | Example | F684Nb7Bg | 25.2 | Amorphous | 1.52 |
| 10 | Example | Fe90Zr7B3 | 25.3 | Amorphous | 1.89 |
REFERENCE OF NUMERICALS [0055]
10, 110, 210...Metal powder producing apparatus
20.. .Melted metal supplying part
...Melted metal
22.. .Container
23.. .Discharge opening
24.. .Heating coil
26.. .Gas spraying nozzle
27.. .Gas spraying opening
30, 130, 230...Cooling part
32.. .Cylinder body
33.. .1.ner face
34.. .Discharging part
37.. .Nozzle
37a...Nozzle hole
136, 236...Flow passage box
137, 237...Nozzle
38, 138, 238...Frame
238a...Frame end
39.. .1.stallation flange
50.. .Cooling liquid layer
52.. .Cooling liquid discharging part
Claims (6)
1. A metal powder producing apparatus comprising a melted metal supplying part discharging a melted metal, a cylinder body provided below the melted metal supplying part, and a cooling liquid layer forming part forming a flow of a cooling liquid for cooling the melted metal discharged from the melted metal supplying part along an inner circumference face of the cylinder body, wherein the cooling liquid layer forming part comprises a nozzle forming the flow of the cooling liquid towards an inner side of a radial direction from the inner circumference face, and a frame provided to the inner side of a radial direction of the inner circumference face for colliding the cooling liquid against the frame to change the flow of the cooling liquid moving from the nozzle towards the inner side of a radial direction into the flow of the cooling liquid moving along the inner circumference face of the cylinder body, and wherein an inner diameter of the frame is smaller than an inner diameter of the inner circumference face of the cylinder body, and a space between the frame and the inner circumference face forms a cooling liquid discharging part to move the cooling liquid along the inner circumference face.
2. The metal powder producing apparatus according to claim 1, wherein the inner diameter of the frame becomes larger in a taper form towards a lower end of the frame in an axial direction.
3. The metal powder producing apparatus according to claim 1 or 2, wherein the frame is provided on an upper part of the cylinder body.
4. A metal powder producing apparatus comprising a melted metal supplying part discharging a melted metal, a cylinder body provided below the melted metal supplying part, and a cooling liquid layer forming part forming a flow of a cooling liquid for cooling the melted metal discharged from the melted metal supplying part along an inner circumference face of the cylinder body, wherein the cooling liquid layer forming part comprises a nozzle forming a spiral flow of the cooling liquid towards an inner side in a radial direction from the inner circumference face, and a frame provided to the inner side of a radial direction of the inner circumference face for colliding the spiral flow of the cooling liquid against the frame to change the flow of the cooling liquid moving from the nozzle towards the inner side of a radial direction into the flow of the cooling liquid moving along the inner circumference face of the cylinder body, and wherein an inner diameter of the frame is smaller than an inner diameter of the inner circumference face of the cylinder body, and a space between the frame and the inner circumference face forms a cooling liquid discharging part to move the cooling liquid along the inner circumference face.
5. A method of producing a metal powder comprising steps of forming a flow of a cooling liquid along an inner circumference face of a cylinder body provided below a melted metal supplying part, and discharging a melted metal from the melted metal supplying part towards the flow of the cooling liquid, wherein the metal powder producing apparatus according to any one of claims
-241 to 3 is used to collide the flow of the cooling liquid moving from the inner circumference face towards the inner side of the radial direction against the frame provided on an upper part of the cylinder body to change the flow of the cooling liquid into the cooling liquid moving along the inner circumference face of the cylinder body.
6. A method of producing a metal powder comprising steps of forming a flow of a cooling liquid along an inner circumference face of a cylinder body provided below a melted metal supplying part, and discharging a melted metal from the melted metal supplying part towards the flow of the cooling liquid, wherein the metal powder producing apparatus according to claim 4 is used to collide the spiral flow of the cooling liquid moving from the inner circumference face towards the inner side of the radial direction against the frame provided on an upper part of the cylinder body to change the spiral flow of the cooling liquid into the cooling liquid moving along the inner circumference face of the cylinder body.
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| JP2017153073A JP6323603B1 (en) | 2017-08-08 | 2017-08-08 | Metal powder manufacturing apparatus and metal powder manufacturing method |
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| TWI721692B (en) * | 2019-12-09 | 2021-03-11 | 財團法人金屬工業研究發展中心 | Device and method for manufacturing metal powder |
| CN111534765B (en) * | 2020-05-27 | 2024-03-15 | 安泰（霸州）特种粉业有限公司 | Spherical amorphous alloy powder preparation device and method |
| KR102335855B1 (en) * | 2020-10-21 | 2021-12-06 | 박요설 | Spraying apparatus with high-pressure gas for enhancing rapid cooling efficiency and manufacturing method of amorphous magnetic powder therewith |
| KR102296910B1 (en) * | 2020-10-21 | 2021-09-02 | 박요설 | Manufacturing apparatus of amorphous magnetic powder for enhancing cooling efficiency and manufacturing method of amorphous magnetic powder therewith |
| EP3988230A1 (en) * | 2020-10-23 | 2022-04-27 | Heraeus Deutschland GmbH & Co. KG | Granulating apparatus with continuous product discharge |
| KR102410113B1 (en) * | 2021-03-31 | 2022-06-22 | 박요설 | Metal power manufacturing apparatus and method for high-quality additve manufacturing |
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| JP2002346377A (en) * | 2001-05-23 | 2002-12-03 | High Frequency Heattreat Co Ltd | Method for preparing ceramics or metallic spherical powder by hot plasma and apparatus therefor |
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| JPS5582702A (en) * | 1978-12-19 | 1980-06-21 | Toyota Motor Corp | Production of metal powder |
| JPS6144111A (en) * | 1984-08-07 | 1986-03-03 | Kawasaki Steel Corp | Apparatus for producing metallic powder |
| JP2672056B2 (en) * | 1991-06-05 | 1997-11-05 | 株式会社クボタ | Method and apparatus for producing metal powder |
| JP2719074B2 (en) * | 1991-06-05 | 1998-02-25 | 株式会社クボタ | Method and apparatus for producing metal powder |
| JP4181234B2 (en) | 1997-09-04 | 2008-11-12 | セイコーエプソン株式会社 | Method and apparatus for producing amorphous metal powder |
| JP3999938B2 (en) * | 1998-12-24 | 2007-10-31 | 福田金属箔粉工業株式会社 | Metal powder manufacturing method |
| JP4375330B2 (en) * | 2005-12-20 | 2009-12-02 | セイコーエプソン株式会社 | Metal powder production equipment |
| JP4207953B2 (en) * | 2005-12-20 | 2009-01-14 | セイコーエプソン株式会社 | Metal powder production equipment |
| JP4778355B2 (en) * | 2006-04-25 | 2011-09-21 | セイコーエプソン株式会社 | Metal powder production equipment |
| JP5396802B2 (en) * | 2008-10-03 | 2014-01-22 | セイコーエプソン株式会社 | Metal powder production equipment |
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| JP6048216B2 (en) * | 2013-02-28 | 2016-12-21 | セイコーエプソン株式会社 | Magnesium-based alloy powder and magnesium-based alloy compact |
| CN104084596B (en) * | 2014-07-15 | 2017-05-03 | 中国科学院宁波材料技术与工程研究所 | Method and device for manufacturing amorphous powder |
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- 2018-08-07 DE DE102018119194.4A patent/DE102018119194A1/en not_active Withdrawn
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| JP2002346377A (en) * | 2001-05-23 | 2002-12-03 | High Frequency Heattreat Co Ltd | Method for preparing ceramics or metallic spherical powder by hot plasma and apparatus therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US11084094B1 (en) | 2017-08-08 | 2021-08-10 | Tdk Corporation | Manufacturing apparatus for metal powder and manufacturing method thereof |
| US11628500B2 (en) | 2017-08-08 | 2023-04-18 | Tdk Corporation | Manufacturing apparatus for metal powder and manufacturing method thereof |
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| CN109382521A (en) | 2019-02-26 |
| JP2019031709A (en) | 2019-02-28 |
| TWI658886B (en) | 2019-05-11 |
| KR102178850B1 (en) | 2020-11-13 |
| DE102018119194A1 (en) | 2019-02-14 |
| CN109382521B (en) | 2022-02-18 |
| TW201910025A (en) | 2019-03-16 |
| GB2565654B (en) | 2020-09-09 |
| JP6323603B1 (en) | 2018-05-16 |
| KR20190016456A (en) | 2019-02-18 |
| GB201812898D0 (en) | 2018-09-19 |
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