Equipment for preparing NdFeB magnetic powder

Abstract

The present invention provides an apparatus for preparing NdFeB magnetic powder, comprising a central box, a raw material supply mechanism connected to the central box, and a product output mechanism, wherein the raw material supply mechanism comprises a first alloy input device and a second alloy input device which are separately arranged, the first alloy input device can input a first alloy powder into the cavity of the central box, the second alloy input device can input a second alloy melt into the cavity of the central box, the first alloy powder contacts with the second alloy melt inside the central box and passes through the second alloy melt, and the NdFeB magnetic powder thus obtained is output from the central box through the product output mechanism. The present invention can especially solve the problem of uneven distribution of the neodymium-rich phase of NdFeB magnetic powder before sintering.

Description

Technical Field

[0001] The invention relates to a device for preparing NdFeB magnetic powder. Background Art

[0002] In the previous process of manufacturing NdFeB magnetic powder, after the alloy raw material is pulverized by air flow grinding, the Nd-rich phase of the obtained NdFeB magnetic powder is not evenly distributed on the particle surface. As a result, during the sintering process of the NdFeB magnet, the Nd-rich grain boundary phase is unevenly distributed. There is no Nd-rich grain boundary phase between some grains, which can cause magnetic coupling between adjacent grains, forming actual large grains and a large local stray magnetic field. Once the anti-magnetization domain core is formed in the local area, it will cause the anti-magnetization of the entire large grain, which will have an extremely adverse effect on the final NdFeB magnet product. Summary of the invention

[0003] The object of the present invention is to provide an improved device for manufacturing NdFeB magnetic powder.

[0004] To this end, the present invention proposes an apparatus for preparing NdFeB magnetic powder, comprising a central box, a raw material supply mechanism connected to the central box, and a product output mechanism, characterized in that the raw material supply mechanism comprises a first alloy input device and a second alloy input device separately arranged, the first alloy input device can input a first alloy powder into the cavity of the central box, the second alloy input device can input a second alloy melt into the cavity of the central box, the first alloy powder contacts with the second alloy melt inside the central box and passes through the second alloy melt, and the NdFeB magnetic powder obtained thereby is output from the central box through the product output mechanism.

[0005] According to one embodiment, the first alloy input device is equipped with a first fan, through which the first alloy powder is blown through the second alloy melt, and a terminal outlet of the first fan is located in the cavity of the central box.

[0006] Advantageously, the first alloy input device comprises a first insulation furnace disposed at the upper end of the central box, and a first valve is disposed at the lower end of the first insulation furnace to form a terminal outlet for inputting the first alloy powder into the cavity of the central box. The first valve is preferably a flow regulating valve.

[0007] Advantageously, the first heat-insulating furnace is assembled on the central box body by hinges and guide columns, so that the first heat-insulating furnace can be adjusted in inclination angle by rotation and can move vertically along the axial direction.

[0008] Here, for the first fan that blows the first alloy powder through the second alloy melt, it is advantageous that the first fan is connected to a guide pipe extending into the interior of the central box, and the terminal outlet of the first holding furnace leads into the interior of the guide pipe.

[0009] Preferably, the guide duct is connected to the end of the first fan by a hinge and a bolt, so that the guide duct can rotate relative to the first fan to adjust the angular positioning of its axial extension direction.

[0010] According to one embodiment, the second alloy input device is equipped with a smelting furnace disposed at the upper end of the central box and includes a second holding furnace located inside the central box, and the smelting furnace is connected to the second holding furnace via a fluid pipe.

[0011] Advantageously, the smelting furnace is connected to the central box via a slideway, so that the smelting furnace together with the second holding furnace can move laterally.

[0012] Advantageously, the lower end of the second holding furnace has a flat opening and is equipped with a second valve, forming an outlet for inputting the second alloy melt into the cavity of the central box, whereby the second alloy melt input is in a curtain shape with adjustable thickness. The second valve is preferably a flow regulating valve.

[0013] Advantageously, a temperature detector is provided in the second holding furnace, through which the temperature of the second alloy melt to be input into the second holding furnace can be observed from the outside.

[0014] Advantageously, the second alloy input device is equipped with a second fan, the end of which is inserted into the upper portion of the second holding furnace.

[0015] According to one embodiment, in the central box, on the side where the first alloy powder passes through the second alloy melt to release the NdFeB magnetic powder, a funnel-shaped fluid groove for receiving the NdFeB magnetic powder is provided. The fluid groove is arranged in the lower area of ​​the central box cavity and extends downward at an angle of 0-90° to form the product output mechanism, and its end is connected to a collector located outside the central box.

[0016] According to one embodiment, the device is equipped with a device for adjusting the pressure and temperature in a local area of ​​the central box on the side where the NdFeB magnetic powder is released. For example, the device includes a vacuum pump, the terminal outlet of which leads to the upper area of ​​the central box; and / or, the device includes a third fan, the air duct of which extends into the central box, the terminal outlet of which is located above the fluid tank and the blowing direction thereof is at an angle of 0-30° relative to the liquid surface of the second alloy melt; and / or, the device includes a fourth fan, the air duct of which is inserted into the lower area of ​​the central box, and the terminal outlet of which is located below the fluid tank.

[0017] According to one embodiment, a third insulation furnace is provided at the bottom of the central box body, a fluid tube is fixed at the upper end of the third insulation furnace, the fluid tube is inserted into the central box body, a funnel-shaped fluid groove for receiving the first alloy powder and / or the second alloy melt is fixed at the top of the fluid tube through a hinge, and the end of the fluid groove is connected to the fluid tube.

[0018] According to some specific implementation forms, the central box can be configured in the shape of a cylinder, a hexahedron or a polyhedron.

[0019] The technical solution proposed in the present invention can achieve the optimization adjustment of the morphology, composition and distribution of the Nd-rich phase. In particular, compared with the prior art, the present invention is beneficial in that it solves the problem of uneven distribution of the Nd-rich phase of NdFeB magnetic powder before sintering, so that NdFeB magnets with excellent performance can be manufactured subsequently. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the equipment used to prepare NdFeB magnetic powder.

[0021] Among them: A-equipment for preparing NdFeB magnetic powder; M1-first insulation furnace; M2-first fan; M3-smelting furnace; M4-second insulation furnace; M5-second fan; M6-vacuum pump; M7-third fan; M8-fourth fan; M9-third insulation furnace; 1-guide column; 2-hinge; 3-hinge; 4-fluid tank; 5-collector; 6-fluid tank. DETAILED DESCRIPTION

[0022] The technical solutions of the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments only relate to a part of the implementation forms of the present application, rather than all of the implementation forms. Based on the embodiments disclosed in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0023] The terms "first", "second", "third", "fourth", etc. in the specification and claims of the present application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, product or device that includes a series of steps or units is not limited to the steps or units listed, but optionally includes steps or units that are not specifically listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. It should be understood by those skilled in the art that in the description of the specification and claims of the present application, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device, mechanism, structure or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so the above terms cannot be understood as limiting the present invention.

[0024] Reference to an "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one implementation of the present application. The appearance of the term in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0025] like Figure 1 As shown, the present application provides an apparatus for preparing NdFeB magnetic powder, which includes a central box, a raw material supply mechanism connected to the central box, and a product output mechanism, the raw material supply mechanism includes a first alloy input device and a second alloy input device separately arranged, the first alloy input device can input a first alloy powder into the cavity of the central box, the second alloy input device can input a second alloy melt into the cavity of the central box, the first alloy powder contacts with the second alloy melt inside the central box and passes through the second alloy melt, and the NdFeB magnetic powder obtained thereby is output from the central box through the product output mechanism.

[0026] According to one exemplary embodiment, it may be provided that:

[0027] The composition expression of the first alloy is: R1 x1 G 100-x1-y1-z1 B y1 J z1 ,

[0028] The composition expression of the second alloy is: R2 x2 G 100-x2-y2-z2 B y2 J z2 ,

[0029] Where x1, x2, y1, y2, z1, z2 represent the weight percentage of the element and the range is as follows:

[0030] x1=27%-31%, y1=0.5%-1.5%, z1=0.1%-8%,

[0031] x2=0%-99%, y2=0%-1.5%, z2=0%-99%,

[0032] R1 represents a rare earth element Nd and one or more of the rare earth elements La, Ce, Pr, Sm, Gd, Dy, Tb, Ho, Er, Eu, Tm, Lu, and Y;

[0033] R2 represents a rare earth element Nd and one or more of the rare earth elements La, Ce, Pr, Sm, Gd, Dy, Tb, Ho, Er, Eu, Tm, Lu, and Y;

[0034] B represents one or more of element B and elements C and S;

[0035] J represents one or more of the elements V, Ta, Mo, W, Cr, Al, Ti, Hf, Mn, Ni, Ge, Sn, Bi, Sb, Si, Zn, Ga, Zr, Cu, and Nb;

[0036] G represents one or more of the element Fe and the elements Ru, Co, and Ni.

[0037] According to one embodiment, the first alloy input device is equipped with a first fan M2, through which the first alloy powder is blown through the second alloy melt, and the terminal outlet of the first fan M2 is located in the cavity of the central box. The first alloy input device includes a first insulation furnace M1 arranged at the upper end of the central box, and a first valve is arranged at the lower end of the first insulation furnace to form a terminal outlet for inputting the first alloy powder into the cavity of the central box. The first valve is preferably a flow regulating valve.

[0038] Preferably, the first insulation furnace M1 is assembled on the central box through the hinge 2 and the guide column 1, so that the first insulation furnace can adjust the inclination angle by rotation and can move vertically along the axial direction.

[0039] Advantageously, the first fan M2 is connected to a guide pipe extending into the interior of the central box, and the terminal outlet of the first insulation furnace M1 leads into the interior of the guide pipe. Preferably, the guide pipe is connected to the terminal of the first fan M2 by a hinge and a bolt, so that the guide pipe can rotate relative to the first fan to adjust the angular positioning of its axial extension direction.

[0040] According to one embodiment, the second alloy input device is equipped with a smelting furnace M3 disposed at the upper end of the central box and includes a second insulation furnace M4 located inside the central box, and the smelting furnace is connected to the second insulation furnace through a fluid pipe.

[0041] Preferably, the smelting furnace M3 is connected to the central box through a slide, so that the smelting furnace M3 together with the second holding furnace M4 can move laterally.

[0042] Preferably, the lower end of the second holding furnace M4 has a flat opening and is equipped with a second valve, forming an outlet for inputting the second alloy melt into the cavity of the central box, and the second alloy melt inputted therefrom is in a curtain shape and its thickness is adjustable. The second valve is preferably a flow regulating valve.

[0043] Preferably, a temperature detector is provided in the second holding furnace M4, through which the temperature of the second alloy melt to be input into the second holding furnace can be observed from the outside. The temperature detector includes, for example, a thermocouple.

[0044] Advantageously, the second alloy input device is equipped with a second fan M5, the end of which is inserted into the upper part of the second insulation furnace M4, thereby adjusting and controlling the flow rate of the second alloy melt out of the insulation furnace.

[0045] In the central box, on the side where the first alloy powder passes through the second alloy melt to release the NdFeB magnetic powder, a funnel-shaped fluid groove 6 (the orientation of the funnel is schematically shown in the figure) is provided for receiving the NdFeB magnetic powder. The fluid groove is arranged in the lower area of ​​the central box cavity, and preferably extends downward at an angle of 0-90° to form the product output mechanism, and its end is connected to the collector 5 located outside the central box.

[0046] Advantageously, the apparatus is equipped with a device for adjusting pressure and temperature in a local area of ​​the central box on the side where the NdFeB magnetic powder is released, so as to create an atmosphere suitable for processing and transporting the NdFeB magnetic powder inside the central box.

[0047] For example, the device includes a vacuum pump M6, the terminal outlet of which is connected to the upper area of ​​the central box. The vacuum pump can generate a local suction effect to facilitate the direction of guiding the first alloy powder through the second alloy melt.

[0048] For example, the device includes a third fan M7, the air duct of the third fan extends into the central box, the outlet of the end of the air duct is located above the fluid tank and the blowing direction thereof forms an angle of 0-30° relative to the liquid surface of the second alloy melt, thereby cooling and / or guiding the NdFeB magnetic powder released from the second alloy melt.

[0049] For example, the device may further include a fourth fan M8, the air duct of the fourth fan is inserted into the lower area of ​​the central box, and the outlet at the end of the air duct is located below the fluid tank.

[0050] Advantageously, a third heat preservation furnace M9 is provided at the bottom of the central box, a fluid pipe is fixed at the upper end of the third heat preservation furnace, the fluid pipe is inserted into the central box, a funnel-shaped fluid groove 4 (the orientation of the funnel is schematically shown in the figure) for receiving the first alloy powder and / or the second alloy melt is fixed at the top of the fluid pipe through a hinge 3, and the end of the fluid groove is connected to the fluid pipe. In this way, the rare earth alloy raw materials can be effectively recovered.

[0051] Each of the above-mentioned fans can adopt a conventional fan design form, for example, each of which is connected to a gas tank at its starting end. The equipment of the present invention generally includes the following devices or components: a central box, a smelting furnace, a holding furnace, a fan, a Roots pump (vacuum pump), a solenoid valve, a fluid pipe, a fluid interface, a temperature detector, a collector, and a gas tank, at least some of which can be directly purchased from the market. Therefore, the technical solution proposed by the present invention can be implemented particularly economically and effectively.

[0052] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the core idea of ​​the present application. At the same time, for ordinary technicians in this field, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An apparatus for preparing NdFeB magnetic powder, comprising a central box, a raw material supply mechanism connected to the central box, and a product output mechanism, characterized in that: The raw material supply mechanism includes a first alloy input device and a second alloy input device which are separately arranged, the first alloy input device can input a first alloy powder into the cavity of the central box, and the second alloy input device can input a second alloy melt into the cavity of the central box, the first alloy powder contacts with the second alloy melt inside the central box and passes through the second alloy melt, and the NdFeB magnetic powder obtained thereby is output from the central box through the product output mechanism; The first alloy input device comprises a first insulation furnace (M1) arranged at the upper end of the central box, a first valve is arranged at the lower end of the first insulation furnace to form a terminal outlet for inputting the first alloy powder into the cavity of the central box, and the first alloy input device is equipped with a first fan (M2), and the first alloy powder is blown through the second alloy melt by the first fan (M2); The second alloy input device comprises a second insulation furnace (M4) located inside the central box, the lower end of the second insulation furnace (M4) has a flat opening and is equipped with a second valve, forming an outlet for inputting the second alloy melt into the cavity of the central box, the second alloy melt inputted therefrom is in a curtain shape and has an adjustable thickness, the second alloy input device is equipped with a second fan (M5), the end of the second fan (M5) is inserted into the upper part of the second insulation furnace (M4), thereby adjusting and controlling the flow rate of the second alloy melt flowing out of the second insulation furnace (M4); In the central box, on the side where the first alloy powder passes through the second alloy melt to release the NdFeB magnetic powder, a first funnel-shaped fluid groove (6) for receiving the NdFeB magnetic powder is provided. The first funnel-shaped fluid groove (6) is arranged in the lower area of ​​the central box cavity and extends downward at an angle of 0-90 degrees to form the product output mechanism, and its end is connected to a collector (5) located outside the central box.

2. The device according to claim 1, characterized in that The terminal outlet of the first fan (M2) is located in the cavity of the central box.

3. The device according to claim 1, characterized in that The first heat-insulating furnace (M1) is assembled on the central box body via a first hinge (2) and a guide column (1), so that the first heat-insulating furnace (M1) can adjust the tilt angle by rotating and can move vertically along the axial direction.

4. The device according to claim 1, characterized in that The first fan (M2) is connected to a guide pipe extending into the interior of the central box, and the terminal outlet of the first insulation furnace (M1) leads into the interior of the guide pipe.

5. The device according to claim 4, characterized in that The guide duct is connected to the end of the first fan (M2) through a hinge and a bolt, so that the guide duct can rotate relative to the first fan to adjust the angular positioning of its axial extension direction.

6. The device according to claim 1, characterized in that The second alloy input device is equipped with a smelting furnace (M3) arranged at the upper end of the central box, and the smelting furnace (M3) is connected to the second insulation furnace (M4) through a fluid pipe.

7. The device according to claim 6, characterized in that The smelting furnace (M3) is connected to the central box through a slideway, so that the smelting furnace (M3) together with the second insulation furnace (M4) can move horizontally.

8. The device according to claim 6, characterized in that The second insulation furnace (M4) is provided with a temperature detector, through which the temperature of the second alloy melt to be input into the second insulation furnace (M4) can be observed from the outside.

9. The device according to claim 1, characterized in that The equipment is equipped with a device for adjusting the pressure and temperature in a local area of ​​the central box on the side where the NdFeB magnetic powder is released.

10. The device according to claim 9, characterized in that The device comprises a vacuum pump (M6), the terminal outlet of which leads into the upper area of ​​the central box.

11. The device according to claim 9, characterized in that The device comprises a third fan (M7), the air duct of the third fan (M7) extends into the central box, the outlet at the end of the air duct is located above the first funnel-shaped fluid groove (6), and the blowing direction thereof forms an angle of 0-30° relative to the liquid surface of the second alloy melt.

12. The device according to claim 9, characterized in that The device comprises a fourth fan (M8), the air duct of the fourth fan (M8) is inserted into the lower area of ​​the central box, and the outlet at the end of the air duct is located below the first funnel-shaped fluid groove (6).

13. The device according to claim 1, characterized in that A third heat-insulating furnace (M9) is arranged at the bottom of the central box body, a fluid pipe is fixed at the upper end of the third heat-insulating furnace (M9), the fluid pipe is inserted into the central box body, and a second funnel-shaped fluid groove (4) for receiving the first alloy powder and / or the second alloy melt is fixed at the top end of the fluid pipe through a second hinge (3), and the end of the second funnel-shaped fluid groove (4) is connected to the fluid pipe.

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