Alloy powder manufacturing equipment

Abstract

To provide, by considering a novel manufacturing method of alloy powder in place of a water atomizing method or a gas atomizing method, an alloy powder manufacturing apparatus suitable therefor.SOLUTION: In an alloy powder manufacturing apparatus 10, a nozzle 30 forms a liquid film 50 having a predetermined thickness PT on a base section 12, by a high speed liquid made of a cooling liquid such as cooling water and supplied under high pressure on the base section 12 to flow at a high speed in an arrow mark A direction. At this time, a predetermined acceleration along the direction of an arrow B is applied to the liquid film 50. The alloy supply unit 40 supplies the molten alloy 60 to the liquid film 50 without dividing it into pieces of a size equal to or less than the predetermined thickness PT. When the molten alloy 60 is supplied to the liquid film 50, the molten alloy 60 is divided by the liquid film 50 made of a high-speed fluid into pieces having a size equal to or less than a predetermined thickness PT to form alloy powder, and by using the predetermined acceleration, the alloy powder is kept in contact with the high velocity fluid in the liquid film 50 and cooled.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention relates to an apparatus for manufacturing alloy powders. [Background technology]

[0002] Generally, water atomization and gas atomization are known methods for producing alloy powders. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Patent No. 4584350 [Overview of the project] [Problems that the invention aims to solve]

[0004] However, alloy powders obtained by water atomization or gas atomization often exhibit qualitative inconsistencies.

[0005] Therefore, the present invention aims to devise a new method for manufacturing alloy powders that can replace the water atomization method and the gas atomization method, and to provide an alloy powder manufacturing apparatus suitable for this method. [Means for solving the problem]

[0006] In conventional rapid-cooling atomization methods, molten alloy is fragmented into powder using gas or water, and then rapidly cooled with a coolant such as cooling water. However, differences in cooling rates due to the size of the fragmented powder particles, as well as differences in the landing point and landing speed of each powder particle, resulted in variations in the time it took for each powder particle to cool in the air before reaching the coolant, leading to inconsistencies in quality. In contrast, if the molten alloy is supplied to a liquid film consisting of a coolant while maintaining a certain degree of mass or flow so as not to cool, the molten alloy is broken up into powder by the liquid film and the powder particles are cooled simultaneously. In other words, by performing the breaking up and cooling of the molten alloy substantially simultaneously, it is possible to suppress differences in the degree of cooling among the powder particles and obtain homogeneous powder particles. The alloy powder manufacturing apparatus of the present invention is based on the manufacturing method described above, and specifically comprises the following configurations.

[0007] The present invention relates to a first alloy powder manufacturing apparatus, The base and, A nozzle for supplying a high-speed fluid consisting of a coolant onto the base in order to form a liquid film having a predetermined thickness and subject to a predetermined acceleration along the thickness direction, At least one alloy supply unit that supplies molten alloy to the liquid film without dividing it into pieces smaller than the predetermined thickness, Equipped with, The high-speed fluid is used to divide the molten alloy into pieces of a size less than or equal to the predetermined thickness, forming alloy powder, and the predetermined acceleration is used to keep the alloy powder in contact with the high-speed fluid within the liquid film and cool it. We provide an apparatus for manufacturing alloy powders.

[0008] Furthermore, the present invention provides a second alloy powder manufacturing apparatus, which is a first alloy powder manufacturing apparatus. The base is the inner wall of the drum having at least a partial curvature, The predetermined acceleration is a centrifugal acceleration toward the inner wall of the drum, generated by utilizing the curvature of the inner wall of the drum. We provide an apparatus for manufacturing alloy powders.

[0009] Furthermore, the present invention provides a third alloy powder manufacturing apparatus, which is a second alloy powder manufacturing apparatus, The curvature is 100 mm or less. The alloy supply unit supplies the molten alloy to the high-speed fluid upstream of the portion having curvature. To provide an alloy powder manufacturing apparatus.

[0010] Further, the present invention provides a fourth alloy powder manufacturing apparatus, which is a third alloy powder manufacturing apparatus, and the inner diameter of the drum is 10 mm or more and 100 mm or less. To provide an alloy powder manufacturing apparatus.

[0011] Further, the present invention provides a fifth alloy powder manufacturing apparatus, which is a fourth alloy powder manufacturing apparatus, and the inner diameter of the drum is 20 mm or more and 60 mm or less. To provide an alloy powder manufacturing apparatus.

[0012] Further, the present invention provides a sixth alloy powder manufacturing apparatus, which is any one of the third to fifth alloy powder manufacturing apparatuses, and further includes an outlet lid provided at the outlet of the drum, and the outlet lid is provided with an opening having an inner diameter smaller than the inner diameter of the drum. To provide an alloy powder manufacturing apparatus.

[0013] Further, the present invention provides a seventh alloy powder manufacturing apparatus, which is any one of the second to sixth alloy powder manufacturing apparatuses, and further includes a scattering prevention part that surrounds at least the vicinity of the outlet of the drum and receives the alloy powder discharged from the drum. To provide an alloy powder manufacturing apparatus.

[0014] Further, the present invention provides an eighth alloy powder manufacturing apparatus, which is any one of the first to seventh alloy powder manufacturing apparatuses, and the initial velocity of the coolant supplied from the nozzle is 80 m / s or more, the predetermined acceleration is 2.0×10 4 G or more and 1.0×10 7 G or less, and the predetermined thickness is 0.1 mm or more. To provide an alloy powder manufacturing apparatus.

[0015] Furthermore, the present invention provides a ninth alloy powder manufacturing apparatus, which is an eighth alloy powder manufacturing apparatus, The initial velocity of the coolant is 100 m / s or more. We provide an apparatus for manufacturing alloy powders.

[0016] Furthermore, the present invention provides a tenth alloy powder manufacturing apparatus, which is an eighth or ninth alloy powder manufacturing apparatus, The predetermined acceleration is 3.0 × 10⁻⁶ 4 It is G or higher. We provide an apparatus for manufacturing alloy powders.

[0017] Furthermore, the present invention provides an eleventh alloy powder manufacturing apparatus, which is any of the eighth to tenth alloy powder manufacturing apparatuses, The predetermined thickness is 0.8 mm or more. We provide an apparatus for manufacturing alloy powders.

[0018] Furthermore, the present invention provides a twelfth alloy powder manufacturing apparatus, which is any one of the first to eleventh alloy powder manufacturing apparatuses, The alloy supply unit is arranged to supply the molten alloy at an angle of 10° to 90° with respect to the liquid film. We provide an apparatus for manufacturing alloy powders.

[0019] Furthermore, the present invention provides a thirteenth alloy powder manufacturing apparatus, which is any one of the first to twelfth alloy powder manufacturing apparatuses, The alloy supply unit is arranged to supply the molten alloy only to a predetermined area on the liquid film with a diameter of 15 mm or less. We provide an apparatus for manufacturing alloy powders.

[0020] Furthermore, the present invention provides a 14th alloy powder manufacturing apparatus, which is any of the first to 13 alloy powder manufacturing apparatuses, The maximum distance from the alloy supply unit to the liquid film is 300 mm or less. We provide an apparatus for manufacturing alloy powders.

[0021] Furthermore, the present invention provides a 15th alloy powder manufacturing apparatus, which is any of the 1st to 14th alloy powder manufacturing apparatuses, The aforementioned at least one alloy supply unit comprises a plurality of alloy supply units. We provide an apparatus for manufacturing alloy powders. [Effects of the Invention]

[0022] By using the alloy powder manufacturing apparatus of the present invention, homogeneous alloy powder can be obtained. [Brief explanation of the drawing]

[0023] [Figure 1] This figure shows an alloy powder manufacturing apparatus according to the first embodiment of the present invention. [Figure 2] This figure shows an alloy powder manufacturing apparatus according to a second embodiment of the present invention. [Figure 3] This figure shows an alloy powder manufacturing apparatus according to a third embodiment of the present invention. [Figure 4] This figure shows an alloy powder manufacturing apparatus according to a fourth embodiment of the present invention. [Figure 5] This figure shows an alloy powder manufacturing apparatus according to a fifth embodiment of the present invention. [Figure 6] This figure shows a modified example of the alloy powder manufacturing apparatus shown in Figure 5. [Figure 7] This figure shows another modified example of the alloy powder manufacturing apparatus shown in Figure 5. [Figure 8] This figure shows an alloy powder manufacturing apparatus according to the sixth embodiment of the present invention. [Figure 9] This figure shows an alloy powder manufacturing apparatus according to the seventh embodiment of the present invention. [Figure 10] This figure shows an alloy powder manufacturing apparatus according to the eighth embodiment of the present invention. [Figure 11] This figure shows an alloy powder manufacturing apparatus according to the ninth embodiment of the present invention. [Modes for carrying out the invention]

[0024] (First Embodiment) Referring to Figure 1, the alloy powder manufacturing apparatus 10 according to the first embodiment of the present invention comprises a base 12, a nozzle 30, and an alloy supply unit 40.

[0025] The nozzle 30 is for supplying a high-pressure coolant, such as cooling water, onto the base 12 and forming a liquid film 50 having a predetermined thickness PT on the base 12 with a high-speed fluid consisting of the coolant flowing at high speed in the direction of arrow A. In this case, the liquid film 50 has a direction along arrow B (i.e., liquid film 50 A predetermined acceleration is applied along the thickness direction.

[0026] The alloy supply unit 40 is for supplying molten alloy 60 to the liquid film 50 without dividing it into pieces smaller than a predetermined thickness PT. That is, in this embodiment, unlike the conventional rapid cooling type atomization method, the molten alloy 60 Instead of breaking it into powder and then rapidly cooling it in a liquid film, the molten alloy 60 is supplied to the liquid film 50 in a somewhat lumpy state.

[0027] When molten alloy 60 is supplied to the liquid film 50 in a certain mass, the liquid film 50, which is made of high-speed fluid, divides the molten alloy 60 into pieces of a predetermined thickness PT or less, forming alloy powder. When the alloy powder comes into contact with the liquid film 50, the alloy powder is cooled, while the coolant surrounding the alloy powder evaporates instantaneously. In this embodiment, the liquid film 50 has a predetermined acceleration. Therefore, even if the coolant surrounding the alloy powder evaporates, the alloy powder is pressed against the high-speed fluid coolant and continues to be in contact with it. In this way, the alloy powder manufacturing apparatus 10 uses a predetermined acceleration to keep the alloy powder in contact with the high-speed fluid within the liquid film 50 and cool it.

[0028] Conventional rapid-cooling atomization methods tend to require large equipment, posing cost problems such as the need for high-pressure gas equipment and gas expenses. In addition, because the powder is cooled to some extent after separation before reaching the liquid film, the cooling rate after reaching the liquid film is reduced. In contrast, the alloy powder manufacturing apparatus 10 according to this embodiment has the following characteristics: Molten alloy By performing the division and cooling of the 60 particles substantially simultaneously within the liquid film 50, differences in the degree of cooling between powder particles are suppressed, thereby achieving homogenization of the powder particles.

[0029] Furthermore, if the powder particles separated by the liquid film 50 are not properly cooled, they may collide with the base 12 that constitutes the bottom of the liquid film 50 before solidification is complete, potentially causing the powder particles to become misshapen. To avoid this, in this embodiment, a predetermined acceleration in the thickness direction of the liquid film 50 (direction along arrow B) is set to 2.0 × 10⁻⁶. 4 The predetermined acceleration is set to G or higher and the predetermined thickness PT of the liquid film 50 is set to 0.1 mm or higher. 4 A minimum of G provides sufficient cooling capacity. Furthermore, by setting the predetermined thickness PT of the liquid film 50 to 0.1 mm or more, fragmented droplets collide with the base 12 before solidifying, suppressing an increase in irregularly shaped powder. In this way, in this embodiment, spherical or nearly spherical powder particles are solidified before reaching the base 12 that constitutes the bottom of the liquid film 50. This allows for obtaining powder particles that are relatively uniform in shape. This method for producing alloy powder according to this embodiment is particularly suitable for producing soft magnetic powder.

[0030] The maximum distance from the alloy supply section 40 to the liquid film 50 is preferably 300 mm or less. In particular, the molten alloy in the alloy supply section 40. 60 liquid film 50 Preferably, the maximum distance from the supply port to the liquid film 50 is 300 mm or less. If the distance from the alloy supply section 40 to the liquid film 50 is too far, cooling will progress before reaching the liquid film 50, reducing the effect of rapidly cooling the alloy at the liquid film 50. In addition, the molten alloy at the point of reaching the liquid film 50 will be 60 This is because the rate of action increases, which may prevent proper disruption by the liquid film 50.

[0031] To generate a predetermined acceleration within the liquid film 50, for example, the base 12 may be made of the inner wall of a drum that has curvature at least partially. If coolant is continuously supplied from the nozzle 30 onto such a base 12, centrifugal acceleration will be generated in the thickness direction of the base (i.e., towards the inner wall of the drum) at least in the curvatured portion. This is used as the predetermined acceleration. Curvature of at least a part of the inner wall of the drum radius of curvature It is preferable that the distance be 100 mm or less in order to obtain the desired predetermined acceleration. When centrifugal acceleration is used as the predetermined acceleration, the alloy supply unit 40 supplies the molten alloy 60 to the high-speed fluid upstream of the curvatured portion of the inner wall of the drum (i.e., the portion where centrifugal acceleration occurs). In this way, by using centrifugal acceleration as the predetermined acceleration, the alloy powder can be continuously cooled efficiently with a simple device configuration.

[0032] Preferably, the initial velocity of the coolant supplied from the nozzle 30 is 80 m / s or more, and the predetermined acceleration is 1.0 × 10⁻⁶ 7 It is below G. If the initial velocity of the coolant is less than 80 m / s, the molten alloy will not function properly. 60 The ability to break up the droplets is poor. As a result, the droplets that are broken up in the liquid film 50 become larger, and the frequency of deformation during cooling increases, leading to an increase in stretched coarse powder. In other words, it is easy to get irregularly shaped powder. In contrast, if the initial velocity of the coolant is 80 m / s or higher, sufficient breaking ability can be obtained, so nearly spherical or spherical powder can be obtained.

[0033] Furthermore, if the initial velocity of the coolant supplied from the nozzle 30 is 100 m / s or more, the powder becomes finer, improving its amorphous properties and magnetic characteristics. Therefore, it is even more preferable that the initial velocity of the coolant be 100 m / s or more. However, if the initial velocity of the coolant supplied from the nozzle 30 exceeds 800 m / s, while the powder itself becomes finer, the amount of thread-like particles increases. Therefore, it is even more preferable that the initial velocity of the coolant be 800 m / s or less.

[0034] The predetermined acceleration in the liquid film 50 is 3.0 × 10⁻⁶. 4It is even more preferable that the acceleration be G or higher. Increasing the predetermined acceleration can improve the cooling capacity. Achieving high cooling capacity has the advantage that alloys with low amorphous formation ability in terms of composition can also be amorphousized.

[0035] Preferably, the predetermined thickness PT is 0.8 mm or more. When the thickness of the liquid film 50 is 0.8 mm or more, the dispersion area of ​​the fragmented droplets in the liquid film 50 expands, which prevents the fragmented droplets from colliding with each other and becoming irregularly shaped. 。

[0036] When supplying the molten alloy 60 to the liquid film 50, it is preferable to supply it only to a predetermined area on the liquid film 50 with a diameter of 15 mm or less. In other words, it is preferable that the alloy supply unit 40 is arranged so as to supply the molten alloy 60 only to a predetermined area on the liquid film 50 with a diameter of 15 mm or less. By supplying the molten alloy 60 to the area below the predetermined area in this way, it is possible to stabilize the quality of the alloy powder and to miniaturize the structure having the base 12 used to form the liquid film 50. It is even more preferable that the predetermined area has a diameter of 10 mm or less.

[0037] (Second Embodiment) Referring to Figure 2, the alloy powder manufacturing apparatus 10a according to the second embodiment of the present invention comprises a drum 20a, a nozzle 30, and an alloy supply unit 40. Components similar to those of the alloy powder manufacturing apparatus 10 of the first embodiment are denoted by the same reference numerals in the drawings, and their descriptions are omitted below.

[0038] The drum 20a has a cylindrical shape except for the opening at the inlet where the molten alloy 60 is supplied and where the nozzle 30 is located. That is, the inner wall 22 of the drum 20a has a curvature corresponding to the inner diameter of the drum 20a. When coolant is supplied from the nozzle 30 to form a liquid film 50 having a predetermined thickness PT on the inner wall 22 of the drum 20a, so that the inner wall 22 of the drum 20a functions as the base 12 in the first embodiment described above, a centrifugal acceleration is generated in the liquid film 50 toward the inner wall 22 of the drum 20a. Specifically, the liquid film 50, consisting of the coolant supplied from the nozzle 30 onto the inner wall 22 of the drum 20a, flows down toward the outlet of the drum 20a while swirling at high speed. As a result, the liquid film 50 generates a centrifugal acceleration along the thickness direction. In this embodiment, this centrifugal acceleration is used as the predetermined acceleration described in the first embodiment. As a result, in this embodiment, alloy powder can be continuously cooled efficiently with a simple device configuration.

[0039] The molten alloy 60 supplied from the alloy supply unit 40 falls into the drum 20a due to its own weight. Therefore, by changing the tilt of the drum 20a, the angle of supply of the molten alloy 60 to the liquid film 50 can be adjusted.

[0040] Here, the inner diameter of the drum 20a is preferably 10 mm or more and 100 mm or less, and more preferably 20 mm or more and 60 mm or less. Reducing the inner diameter of the drum 20a increases the centrifugal acceleration, which improves the amorphous properties of the alloy powder produced. Specifically, this effect is amplified when the inner diameter of the drum 20a is 100 mm or less, and good amorphous powder can be obtained even with a composition of Fe content of 80 at% or more. Reducing the inner diameter of the drum 20a to 60 mm or less further improves the amorphous properties of the alloy powder produced. On the other hand, the smaller the inner diameter of the drum 20a, the greater the improvement in amorphous properties, but in practical terms, if it is less than 10 mm, the alloy molten metal will not be able to survive. 60 Supply is difficult. Therefore, the inner diameter of the drum 20a is preferably 10 mm or more, and the liquid film 50 against molten alloy 60 To ensure a more stable supply, the inner diameter of the drum 20a is preferably 20 mm or larger.

[0041] When supplying the molten alloy 60 to the liquid film 50, it can be carried out more stably by tilting it. Also, by increasing the supply angle of the molten alloy 60 with respect to the liquid film 50, it becomes possible to refine the alloy powder. From such a viewpoint, it is preferable to supply the molten alloy 60 so as to form an angle of 10° or more and 90° or less with respect to the liquid film 50. In other words, it is preferable that the alloy supply unit 40 is arranged so as to supply the molten alloy 60 while forming an angle of 10° or more and 90° or less with respect to the liquid film 50.

[0042] Regarding the relationship between the drum 20a and the alloy supply unit 40, when the minor diameter of the entrance of the drum 20a is R min and the distance from the alloy supply unit 40 to the entrance of the drum 20a is D (the units of both R min and D are both "mm"), the ratio of D to R (D / R min ) is preferably 50 or less. That is, the distance D (mm) from the supply port for supplying the molten alloy min in the alloy supply unit 40 to the entrance where the molten alloy 60 is supplied / the minor diameter R 60 (mm) of the entrance where the molten alloy 60 is supplied is preferably 50 or less. This is because if the distance from the alloy supply unit 40 to the entrance (the entrance of the drum 20a) where the molten alloy 60 is supplied is too long, the supplied molten alloy 60 may be deflected or spread due to air resistance and environmental influences, rather than being supplied straight. min

[0043] Regarding the relationship between the nozzle 30 and the alloy supply unit 40, when the amount of the cooling liquid supplied from the nozzle 30 is Aw and the supply amount of the molten alloy 60 from the alloy supply unit 40 is Am (the units of both Aw and Am are both "kg / min"), the ratio of Am to Aw (Am / Aw) is preferably 1 / 15 or less. This is because if the supply amount of the molten alloy 60 is too large compared to the supply amount of the cooling liquid, there is a possibility that fragmentation and cooling may not be sufficiently performed.

[0044] (Third Embodiment) Referring to Figures 2 and 3, the alloy powder manufacturing apparatus 10b according to the third embodiment of the present invention is a modified version of the alloy powder manufacturing apparatus 10a according to the second embodiment described above. Therefore, components similar to those in the alloy powder manufacturing apparatus 10a of the second embodiment are denoted by the same reference numerals in the drawings, and their descriptions are omitted below.

[0045] The alloy powder manufacturing apparatus 10b according to this embodiment further includes an outlet cover 24 provided at the outlet of the drum 20b. This outlet cover 24 has an opening with an inner diameter smaller than the inner diameter of the drum 20b. In other words, the outlet cover 24 has the function of narrowing the outlet of the drum 20b. This makes it possible to increase the thickness of the liquid film 50.

[0046] (Fourth embodiment) Referring to Figures 3 and 4, the alloy powder manufacturing apparatus 10c according to the fourth embodiment of the present invention is a modified version of the alloy powder manufacturing apparatus 10b according to the third embodiment described above. Therefore, the same reference numerals are used in the drawings for components similar to those in the alloy powder manufacturing apparatus 10a of the second embodiment and the alloy powder manufacturing apparatus 10b of the third embodiment, and their descriptions are omitted below.

[0047] The alloy powder manufacturing apparatus 10c according to this embodiment further includes a cylindrical scattering prevention section 35 that surrounds the drum 20b. As described above, in this embodiment, the liquid film 50 is composed of a cooling liquid that swirls at high speed along the inner wall 22 of the drum 20b. Therefore, the cooling liquid discharged from the outlet of the drum 20b has force, and the alloy powder moved by it is also prone to scattering. In contrast, the alloy powder manufacturing apparatus 10c according to this embodiment is equipped with a scattering prevention section 35, making it easy to recover the discharged alloy powder.

[0048] The scattering prevention section 35 in this embodiment is composed of a cylindrical body, but its shape and structure are not limited as long as the objective of facilitating the recovery of alloy powder is achieved. Furthermore, in order to achieve this objective, it should surround at least the area near the outlet of the drum 20b, but it is not necessary to surround parts other than the area near the outlet.

[0049] In this embodiment, the alloy powder manufacturing apparatus 10c is an alloy powder manufacturing apparatus 10b according to the third embodiment described above with the addition of a scattering prevention unit 35. However, the scattering prevention unit 35 may also be added to the alloy powder manufacturing apparatus 10a according to the second embodiment.

[0050] (Fifth embodiment) Referring to Figure 5, the alloy powder manufacturing apparatus 10d according to the fifth embodiment of the present invention is a modified version of the alloy powder manufacturing apparatus 10a according to the second embodiment described above. Therefore, the same reference numerals are used in the drawings for components similar to those in the alloy powder manufacturing apparatus 10a of the second embodiment, and their description is omitted below.

[0051] The alloy powder manufacturing apparatus 10d according to this embodiment has a drum 20d placed horizontally, and the molten alloy 60 from the alloy supply unit 40 is supplied to the liquid film 50 through an opening provided in a part of the inner wall 22. In this embodiment, the predetermined acceleration is gravity alone, but the acceleration may be increased by other means.

[0052] The cross-sectional shape of the drum 20d of the alloy powder manufacturing apparatus 10d is not particularly limited. For example, the cross-sectional shape may be rectangular, as is the case with the drum 20e of the alloy powder manufacturing apparatus 10e shown in Figure 6, or it may be circular, as is the case with the drum 20f of the alloy powder manufacturing apparatus 10f shown in Figure 7.

[0053] (Sixth embodiment) Referring to Figures 5 and 8, the alloy powder manufacturing apparatus 10g according to the sixth embodiment of the present invention is a modified version of the alloy powder manufacturing apparatus 10d according to the fifth embodiment described above. Therefore, components similar to those in the alloy powder manufacturing apparatus 10d of the fifth embodiment are denoted by the same reference numerals in the drawings, and their description is omitted below.

[0054] The alloy powder manufacturing apparatus 10g according to this embodiment is equipped with two alloy supply units 40, and supplies molten alloy 60 to the liquid film 50 at two locations. Thus, the alloy powder manufacturing apparatus may be equipped with multiple alloy supply units 40.

[0055] In this embodiment, the alloy powder manufacturing apparatus 10g is an alloy powder manufacturing apparatus 10d according to the fifth embodiment described above, with one additional alloy supply unit 40 added. However, one or more alloy supply units 40 may be added to the alloy powder manufacturing apparatuses 10a to 10c according to the second to fourth embodiments.

[0056] (Seventh Embodiment) Referring to Figures 2, 5, and 9, the alloy powder manufacturing apparatus 10h according to the seventh embodiment of the present invention is a modified version of the alloy powder manufacturing apparatus 10a according to the second embodiment and the alloy powder manufacturing apparatus 10d according to the fifth embodiment described above. Therefore, the same reference numerals are used in the drawings for components similar to those in the alloy powder manufacturing apparatus 10a of the second embodiment and the alloy powder manufacturing apparatus 10d of the fifth embodiment, and their descriptions are omitted below.

[0057] The alloy powder manufacturing apparatus 10h according to this embodiment has a substantially cylindrical drum 20h placed horizontally, and a cooling liquid is supplied from a nozzle 30 onto its inner wall 22 to form a liquid film 50. In this embodiment, the predetermined acceleration is mainly, nozzle The supply of coolant from 30 generates centrifugal acceleration in the liquid film 50. The molten alloy 60 from the alloy supply unit 40 is supplied to the liquid film 50 through an opening provided in a part of the inner wall 22 of the drum 20h.

[0058] (Eighth embodiment) Referring to Figures 2 and 10, the alloy powder manufacturing apparatus 10i according to the eighth embodiment of the present invention is a modified version of the alloy powder manufacturing apparatus 10a according to the second embodiment described above. Therefore, components similar to those in the alloy powder manufacturing apparatus 10a of the second embodiment are denoted by the same reference numerals in the drawings, and their descriptions are omitted below.

[0059] The alloy powder manufacturing apparatus 10i according to this embodiment has a horizontal surface at the end of the drum 20i, and the opening provided in this horizontal surface serves as the inlet of the drum 20i. That is, in this embodiment, the inlet of the drum 20i is independent of the plane perpendicular to the axial direction of the drum 20i. In this case, the distance from the alloy supply unit 40 to the inlet of the drum 20i is clearly defined, which has the advantage of making it easier to calculate the influence of the environment on the molten alloy 60, regardless of the installation location or inclination of the drum 20i.

[0060] (Ninth Embodiment) Referring to Figures 10 and 11, the alloy powder manufacturing apparatus 10j according to the ninth embodiment of the present invention is a modified version of the alloy powder manufacturing apparatus 10i according to the eighth embodiment described above. Therefore, the same reference numerals are used in the drawings for components similar to those of the alloy powder manufacturing apparatus 10i of the eighth embodiment, and their description is omitted below.

[0061] As shown in Figure 11, in this embodiment, the alloy powder manufacturing apparatus 10j has an arc-shaped cross-section of the inner wall 22 when cut by a plane including the central axis. That is, the drum 20j mainly has a shape like a part of a ring-shaped pipe. As can be seen from this embodiment, the cross-sectional shape of the drum is somewhat flexible.

[0062] (Examples 1-19 and Comparative Example 1-19) 4 ) Using the alloy powder manufacturing apparatus according to the embodiment of the present invention described above, alloy powder was manufactured under several conditions as shown in Table 1 below, and the obtained alloy powder was evaluated.

[0063] [Table 1]

[0064] According to Table 1, when the inner diameter of the drum exceeds 100 mm, as in Comparative Example 1, the shape of the powder particles becomes irregular and the properties are poor. Also, Comparative Example 2 and Comparative Example 4 As shown above, when the initial velocity of the coolant was less than 80 m / s, the shape of the powder particles became irregular, and the properties were poor. In contrast, the alloy powders of Examples 1 to 19 had spherical or nearly spherical powder particle shapes, good amorphous properties, low coercivity, and good properties.

[0065] As shown in Examples 8-12, by making the inner diameter of the drum outlet smaller than the inner diameter of the drum, a dam is formed at the outlet, allowing for adjustment to increase the thickness of the coolant, thereby enabling control of particle size. For example, when manufacturing large-particle alloy powder, a thick liquid film is required due to the necessary cooling time. In such cases, as shown in Examples 8-12, the inner diameter of the drum outlet should be made smaller than the inner diameter of the drum. [Explanation of Symbols]

[0066] 10,10a,10b,10c,10d,10e,10f,10g,10h,10i,10j Alloy powder manufacturing equipment 12 base 20a, 20b, 20d, 20e, 20f, 20h, 20i, 20j Drum 22 Inner wall 24 Outlet lid 30 nozzles 35 Scattering prevention part (scattering prevention tube) 40 Alloy supply section 50 liquid film PT specified thickness 60 molten alloy

Claims

1. The base and, A nozzle for supplying a high-speed fluid consisting of a coolant onto the base in order to form a liquid film having a predetermined thickness and subject to a predetermined acceleration along the thickness direction, At least one alloy supply unit that supplies molten alloy to the liquid film without dividing it into pieces smaller than the predetermined thickness, Equipped with, An alloy powder manufacturing apparatus comprising: dividing the molten alloy into pieces of a predetermined thickness or less using the high-speed fluid to form alloy powder; and continuously cooling the alloy powder by keeping it in contact with the high-speed fluid within the liquid film using the predetermined acceleration, The base is the inner wall of the drum having at least a partial curvature, The predetermined acceleration is a centrifugal acceleration toward the inner wall of the drum, generated by utilizing the curvature of the inner wall of the drum. The drum is further provided with an outlet cover at its outlet, The outlet cover is provided with an opening having an inner diameter smaller than the inner diameter of the drum. The initial velocity of the coolant supplied from the nozzle is 80 m / s or more. The predetermined acceleration is between 2.0 × 10⁴ G and 1.0 × 10⁷ G. The predetermined thickness is 0.1 mm or more. Alloy powder manufacturing equipment.

2. The alloy powder manufacturing apparatus according to claim 1, The radius of curvature of the aforementioned curvature is 100 mm or less. The alloy supply unit supplies the molten alloy to the high-speed fluid upstream of the portion having curvature. Alloy powder manufacturing equipment.

3. The alloy powder manufacturing apparatus according to claim 2, The inner diameter of the drum is between 10 mm and 100 mm. Alloy powder manufacturing equipment.

4. The alloy powder manufacturing apparatus according to claim 3, The inner diameter of the drum is between 20 mm and 60 mm. Alloy powder manufacturing equipment.

5. An alloy powder manufacturing apparatus according to any one of claims 1 to 4, The system further includes a scattering prevention section that surrounds at least the area near the outlet of the drum and receives the alloy powder discharged from the drum. Alloy powder manufacturing equipment.

6. An alloy powder manufacturing apparatus according to any one of Claims 1 to 5, The initial velocity of the coolant is 100 m / s or more. Alloy powder manufacturing equipment.

7. An alloy powder manufacturing apparatus according to any one of claims 1 to 6, The predetermined acceleration is 3.0 × 10⁻⁶ ４ It is G or higher. Alloy powder manufacturing equipment.

8. An alloy powder manufacturing apparatus according to any one of claims 1 to 7, The predetermined thickness is 0.8 mm or more. Alloy powder manufacturing equipment.

9. An alloy powder manufacturing apparatus according to any one of claims 1 to 8, The alloy supply unit is arranged to supply the molten alloy at an angle of 10° to 90° with respect to the liquid film. Alloy powder manufacturing equipment.

10. An alloy powder manufacturing apparatus according to any one of claims 1 to 9, The alloy supply unit is arranged to supply the molten alloy only to a predetermined area on the liquid film with a diameter of 15 mm or less. Alloy powder manufacturing equipment.

11. An alloy powder manufacturing apparatus according to any one of claims 1 to 10, The maximum distance from the alloy supply unit to the liquid film is 300 mm or less. Alloy powder manufacturing equipment.

12. An alloy powder manufacturing apparatus according to any one of claims 1 to 11, The aforementioned at least one alloy supply unit comprises a plurality of alloy supply units. Alloy powder manufacturing equipment.

Images