A high-abundance rare earth permanent magnet material and a preparation method thereof

Abstract

The present invention belongs to the technical field of permanent magnetic materials, and specifically relates to a high-abundance rare earth permanent magnetic material and a preparation method thereof. A support arm, a motor, a tank body, a sealing cover, a main shaft, a stirring paddle, a suction tube, fan blades and a return pipe are provided. The motor drives the main shaft to rotate through a belt transmission, driving the stirring paddle to stir alloy powder inside the tank body. At the same time, the main shaft drives the fan blades to rotate, and the airflow inside the suction tube sucks up the alloy powder at the bottom of the suction tube. The alloy powder moves upward along the suction tube along with the airflow. When the alloy powder floats along with the airflow, the alloy powder is fully mixed. The alloy powder is sprayed from the return pipe to the bottom of the tank body. The high-speed sprayed alloy powder blows away the alloy powder accumulated on the outer circle of the bottom of the tank body to collapse and move to the bottom of the suction tube. On the basis of being stirred and mixed by the stirring paddle, the alloy powder floats and mixes inside the suction tube, thereby improving the uniformity and efficiency of the alloy powder mixing.

Description

Technical Field

[0001] The present invention belongs to the technical field of permanent magnetic materials, in particular to a high-abundance rare earth permanent magnetic material and a preparation method thereof. Background Art

[0002] Rare earth permanent magnet material is a permanent magnet material with the highest comprehensive performance known to date. It is a magnetic material made by magnetizing an alloy composed of rare earth metals and transition metals. It not only promotes the miniaturization of permanent magnet devices and improves product performance, but also promotes the production of certain special devices.

[0003] A Chinese patent, publication number CN113436826A, discloses a high-abundance rare earth sintered permanent magnet and its preparation method. The permanent magnet comprises the following components by weight: 0.9-1.12% ferroboron alloy, 64.38-70.1% pure iron, 29-32.5% rare earth elements, and 0-2% trace elements. The preparation process utilizes a specific sintering process curve and a specialized sintering rack to improve temperature stability, thereby enhancing the overall performance of the product.

[0004] When preparing rare earth permanent magnet materials, the main phase alloy powder and the auxiliary phase alloy powder need to be stirred and mixed. However, the alloy powder is relatively fine and has good fluidity, making it difficult for the stirring device to stir and mix the alloy powder well. Some alloy powder will accumulate on the outer circle of the bottom of the tank, reducing the mixing uniformity of the alloy powder.

[0005] To this end, the present invention provides a high-abundance rare earth permanent magnet material and a preparation method thereof. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a high-abundance rare earth permanent magnet material according to the present invention is composed of the following raw materials in parts by weight:

[0008] Main phase alloy 90-100 parts

[0009] 1-5 parts of auxiliary phase alloy;

[0010] The main phase alloy is composed of the following raw materials in parts by weight:

[0011]

[0012] The auxiliary phase alloy is composed of the following raw materials in parts by weight:

[0013] 50-60 parts of rare earth elements

[0014] 40-50 parts of iron;

[0015] The rare earth elements include lanthanum, cerium, praseodymium and neodymium; the other elements are one or more of cobalt, nickel, molybdenum, gallium, aluminum, copper, zirconium and niobium.

[0016] A method for preparing a high-abundance rare earth permanent magnet material, which is applicable to the above-mentioned rare earth permanent magnet material, and the preparation method comprises the following steps:

[0017] A1: The main phase alloy and auxiliary phase alloy are prepared by induction melting and rapid solidification strip spinning process respectively;

[0018] A2: The main phase alloy and the auxiliary phase alloy are subjected to a hydrogen crushing process and a jet milling process to prepare a main phase alloy powder and an auxiliary phase alloy powder;

[0019] A3: Use a stirring device to mix and stir the main phase alloy powder and the auxiliary phase alloy powder in an argon protective atmosphere;

[0020] A4: The uniformly mixed alloy powder is compacted in a magnetic field and then cold isostatically pressed to form a green body;

[0021] A5: The green body is sintered under vacuum conditions and then tempered to produce a high-abundance rare earth permanent magnet.

[0022] Preferably, the stirring and mixing method of the stirring device in A3 comprises the following steps:

[0023] B1: Add the main phase alloy powder and the auxiliary phase alloy powder into the interior of the tank, fasten the sealing cover, evacuate the air inside the tank, and fill it with argon gas;

[0024] B2: Start the motor, drive the main shaft to drive the stirring paddle to stir the alloy powder inside the tank, and at the same time, drive the fan blades to rotate, generating an upward airflow inside the suction cylinder, sucking up the alloy powder at the bottom of the suction cylinder. The alloy powder is fully mixed inside the suction cylinder along with the airflow;

[0025] B3: Alloy powder is sprayed from the reflux pipe to the bottom of the tank. The high-speed sprayed alloy powder blows the alloy powder accumulated on the outer circle of the bottom of the tank to collapse and move to the bottom of the suction tube, so that the alloy powder is stirred and mixed, and the air circulation is carried out to mix the alloy powder evenly.

[0026] The top of the suction cylinder is connected with the outer ring of the main shaft, and the inner ring of the suction cylinder is sleeved on the outer ring of the main shaft, and the bottom end of the suction cylinder is fixed with the outer ring of the fan blade. The top side of the suction cylinder is connected with the reflux pipe, and the outlet of the reflux pipe points to the bottom of the tank body away from the stirring paddle. When working, the main phase alloy powder and the auxiliary phase alloy powder are added to the interior of the tank body, and the sealing is tightened. The cover is used to extract the air inside the tank and fill it with argon; the motor drives the main shaft to rotate through the belt drive, driving the stirring paddle to stir the alloy powder inside the tank. At the same time, the main shaft drives the fan blades to rotate, generating an upward airflow inside the suction cylinder, and the stirring paddle stirs the alloy powder at the bottom of the suction cylinder. The airflow inside the suction cylinder sucks up the alloy powder at the bottom of the suction cylinder, causing a depression at the bottom of the suction cylinder, causing the alloy powder in the outer circle to approach the depression, and the alloy powder moves upward along the suction cylinder with the airflow. When the alloy powder floats with the airflow, the alloy powder is fully mixed and sprayed from the reflux pipe to the bottom of the tank. The high-speed sprayed alloy powder blows away the alloy powder accumulated in the outer circle of the bottom of the tank, causing it to collapse and move to the bottom of the suction cylinder. On the basis of being stirred and mixed by the stirring paddle, the alloy powder floats and mixes inside the suction cylinder, thereby improving the uniformity and efficiency of the alloy powder mixing.

[0027] Preferably, a plurality of sleeve rods are fixed around the middle outer wall of the stirring paddle, an elastic slide rod is slidably installed inside the sleeve rod, an elastic rope is fixed between the end of the sleeve rod close to the center of the stirring paddle and the end of the elastic slide rod close to the inside of the sleeve rod, and a ball head is fixed to the end of the elastic slide rod away from the sleeve rod; during operation, when the stirring paddle rotates, the centrifugal force generated causes the elastic slide rod to slide out from the inside of the sleeve rod, causing the elastic rope to stretch and expand the stirring diameter of the stirring paddle; at the same time, the elastic slide rod drives the ball head to hit the inner wall of the tank body, lifting the alloy powder accumulated on the outer ring of the tank body, reducing the probability of alloy powder accumulating on the outer ring of the bottom of the tank body.

[0028] Preferably, a plurality of balls are installed on the outer ring of one end of the elastic slide rod close to the sleeve rod, and the outer wall of the ball slides with the inner wall of the sleeve rod; when working, when the elastic slide rod slides, it drives the balls to slide against the inner wall of the sleeve rod, and at the same time the balls are blocked by the inner ring at the opening of the sleeve rod; the balls not only reduce the friction resistance between the elastic slide rod and the sleeve rod, but also reduce the probability of the elastic slide rod sliding out of the sleeve rod, reduce the influence of the elastic slide rod on the rotation of the stirring paddle after it detaches from the sleeve rod, and improve safety.

[0029] Preferably, the end of the sleeve rod is fixed with a conical rubber sleeve, the inner ring of the conical rubber sleeve is slidably matched with the outer ring of the elastic sliding rod, and an elastic ring is slidably installed inside the conical rubber sleeve; the elastic force of the elastic ring makes the inner ring of the conical rubber sleeve tightly adhere to the outer ring of the elastic sliding rod; during operation, when the elastic sliding rod slides into the interior of the sleeve rod under the tension of the elastic rope, the outer ring of the elastic sliding rod slides in contact with the inner ring of the conical rubber sleeve, pushing away the alloy powder contaminated on the outer wall of the elastic sliding rod, thereby improving the cleanliness of the interior of the sleeve rod, and then improving the smoothness of the sliding of the elastic sliding rod.

[0030] Preferably, a plurality of groups of spoilers are fixedly connected to the interior of the suction cylinder, and each group of spoilers is fixedly connected to the inner wall of the suction cylinder, and the spoilers are at an oblique angle to the main axis; during operation, when the alloy powder moves upward along the suction cylinder along with the airflow, the airflow is blocked and guided by the spoilers, so that the airflow rotates inside the suction cylinder, so that the alloy powders floating along the airflow collide with each other and mix, which not only improves the degree of crushing of the alloy powder, but also improves the degree of mixing of the alloy powder.

[0031] Preferably, the outer wall of the main shaft is fixed with multiple groups of flexible rods, and the ends of the flexible rods are fixed with steel balls, and each group of the flexible rods is located above the spoiler; during operation, the main shaft gradually accelerates and rotates under the drive of the motor until the speed of the main shaft is constant, and the main shaft drives the flexible rods to gradually bend downward and straighten toward the outer circle, so that the steel balls are separated from the spoiler of the next layer from hitting the spoiler, and the flexible rods rotate, thereby improving the uniformity of mixing of the upward-moving alloy powder; when the stirring is completed, the motor is turned off, and the upward airflow inside the suction cylinder disappears, causing the alloy powder inside the suction cylinder to fall downward, and the speed of the main shaft gradually decreases until it stops, causing the speed of the flexible rods to gradually decrease, so that the ends of the flexible rods are bent downward under the action of the gravity of the steel balls, so that the steel balls hit the spoiler, and the alloy powder on the surface of the spoiler is shaken off, thereby improving the cleanliness of the spoiler, and then reducing the loss of alloy powder.

[0032] The beneficial effects of the present invention are as follows:

[0033] 1. The high-abundance rare earth permanent magnet material and the preparation method thereof described in the present invention are provided with a support arm, a motor, a tank body, a sealing cover, a main shaft, a stirring paddle, a suction cup, a fan blade and a return pipe; the motor drives the main shaft to rotate through the transmission of the belt, and drives the stirring paddle to stir the alloy powder inside the tank body. At the same time, the main shaft drives the fan blade to rotate, and an upward airflow is generated inside the suction cup. The airflow inside the suction cup sucks up the alloy powder at the bottom of the suction cup, and the alloy powder moves upward along the suction cup along with the airflow. When the alloy powder floats with the airflow, the alloy powder is fully mixed, and the alloy powder is sprayed from the reflux pipe to the bottom of the tank body. The high-speed sprayed alloy powder blows away the alloy powder accumulated on the outer circle of the bottom of the tank body to collapse and move to the bottom of the suction cup. On the basis of being stirred and mixed by the stirring paddle, the alloy powder is made to float and mix inside the suction cup, thereby improving the uniformity and mixing efficiency of the alloy powder mixing.

[0034] 2. The high-abundance rare earth permanent magnet material and preparation method thereof described in the present invention are provided with a sleeve rod, an elastic slide rod, an elastic rope and a ball head; the centrifugal force generated when the stirring paddle rotates causes the elastic slide rod to slide out from the inside of the sleeve rod, causing the elastic rope to stretch and expand the stirring diameter of the stirring paddle; at the same time, the elastic slide rod drives the ball head to hit the inner wall of the tank body, lifting the alloy powder accumulated on the outer circle of the tank body, thereby reducing the probability of the alloy powder accumulating on the outer circle of the bottom of the tank body. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below with reference to the accompanying drawings.

[0036] Figure 1 is a perspective view of embodiment 1 of the present invention;

[0037] Figure 2 This is a front view of the first embodiment of the present invention;

[0038] Figure 3 yes Figure 2 A partial enlarged view of the middle A;

[0039] Figure 4 yes Figure 3 A partial enlarged view of point B in the middle;

[0040] Figure 5 yes Figure 2 A partial enlarged view of point C in the middle;

[0041] Figure 6 This is a bottom structural diagram of a stirring paddle according to a second embodiment of the present invention;

[0042] Figure 7 It is a flow chart of the preparation method of the present invention;

[0043] Figure 8 is a flow chart of the stirring and mixing method of the present invention;

[0044] In the figure: 1. Support arm; 2. Motor; 3. Tank body; 4. Sealing cover; 5. Main shaft; 6. Agitator paddle; 7. Suction cup; 8. Fan blade; 9. Return pipe; 10. Sleeve rod; 11. Elastic slide rod; 12. Elastic rope; 13. Ball head; 14. Ball; 15. Conical rubber sleeve; 16. Elastic ring; 17. Spoiler; 18. Flexible rod; 19. Steel ball; 20. Rubber block; 21. Vertical rod. DETAILED DESCRIPTION

[0045] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0046] Example 1

[0047] The high-abundance rare earth permanent magnet material according to an embodiment of the present invention is composed of the following raw materials in parts by weight:

[0048] Main phase alloy 90-100 parts

[0049] 1-5 parts of auxiliary phase alloy;

[0050] The main phase alloy is composed of the following raw materials in parts by weight:

[0051]

[0052] The auxiliary phase alloy is composed of the following raw materials in parts by weight:

[0053] 50-60 parts of rare earth elements

[0054] 40-50 parts of iron;

[0055] The rare earth elements include lanthanum, cerium, praseodymium and neodymium; the other elements are one or more of cobalt, nickel, molybdenum, gallium, aluminum, copper, zirconium and niobium.

[0056] like Figure 7 As shown, a preparation method of a high-abundance rare earth permanent magnet material is applicable to the above-mentioned rare earth permanent magnet material, and the preparation method comprises the following steps:

[0057] A1: The main phase alloy and auxiliary phase alloy are prepared by induction melting and rapid solidification strip spinning process respectively;

[0058] A2: The main phase alloy and the auxiliary phase alloy are subjected to a hydrogen crushing process and a jet milling process to prepare a main phase alloy powder and an auxiliary phase alloy powder;

[0059] A3: Use a stirring device to mix and stir the main phase alloy powder and the auxiliary phase alloy powder in an argon protective atmosphere;

[0060] A4: The uniformly mixed alloy powder is compacted in a magnetic field and then cold isostatically pressed to form a green body;

[0061] A5: The green body is sintered under vacuum conditions and then tempered to produce a high-abundance rare earth permanent magnet.

[0062] like Figure 8 As shown, the stirring and mixing method of the stirring device in A3 includes the following steps:

[0063] B1: Add the main phase alloy powder and the auxiliary phase alloy powder into the interior of the tank body 3, fasten the sealing cover 4, evacuate the air inside the tank body 3, and fill it with argon gas;

[0064] B2: Start the motor 2, drive the main shaft 5 to drive the stirring paddle 6 to stir the alloy powder inside the tank 3, and at the same time, drive the fan blade 8 to rotate, generating an upward airflow inside the suction cylinder 7, sucking up the alloy powder at the bottom of the suction cylinder 7. The alloy powder is fully mixed inside the suction cylinder 7 along with the airflow;

[0065] B3: Alloy powder is sprayed from the reflux pipe 9 to the bottom of the tank body 3. The high-speed sprayed alloy powder blows the alloy powder accumulated in the outer circle of the bottom of the tank body 3 to collapse and move to the bottom of the suction tube 7, so that the alloy powder is stirred and mixed, and the air flow circulates and mixes, and the alloy powder is evenly mixed.

[0066] like Figures 1 to 2As shown, the stirring device includes a support arm 1, a motor 2, a tank body 3, a sealing cover 4, a main shaft 5, a stirring paddle 6, a suction cylinder 7, a fan blade 8 and a reflux pipe 9; a support arm 1 is provided on one side of the tank body 3, the top surface of the support arm 1 is fixedly connected to the motor 2, the top surface of the tank body 3 is bolted to the sealing cover 4, the top and bottom surfaces of the support arm 1 are fixedly connected to the top surface of the sealing cover 4, the bottom surface of the sealing cover 4 is rotatably mounted with a main shaft 5, the motor 2 and the main shaft 5 are connected by a belt drive, and the sealing cover 4 is rotatably mounted on the bottom surface of the main shaft 5. The bottom surface of the cover 4 is fixed with a suction cylinder 7, the inner ring of the suction cylinder 7 is sleeved on the outer ring of the main shaft 5, the bottom end of the main shaft 5 is fixed with a stirring paddle 6, the stirring paddle 6 is located below the suction cylinder 7, the middle outer ring of the main shaft 5 is fixed with a fan blade 8, the inner ring of the suction cylinder 7 is sleeved on the outer ring of the fan blade 8, the top side of the suction cylinder 7 is connected with a reflux pipe 9, the outlet of the reflux pipe 9 points to the bottom of the side of the tank body 3 away from the stirring paddle 6; when working, the main phase alloy powder and the auxiliary phase alloy powder are added to the tank body 3 The inside of the tank body 3 is tightened, the sealing cover 4 is bolted, the air inside the tank body 3 is extracted, and argon is filled in; the motor 2 drives the main shaft 5 to rotate through the belt drive, and drives the stirring paddle 6 to stir the alloy powder inside the tank body 3. At the same time, the main shaft 5 drives the fan blades 8 to rotate, generating an upward airflow inside the suction tube 7, and the stirring paddle 6 stirs the alloy powder at the bottom of the suction tube 7. The airflow inside the suction tube 7 sucks up the alloy powder at the bottom of the suction tube 7, so that a depression is generated at the bottom of the suction tube 7, so that the alloy powder in the outer circle approaches the depression, and the alloy powder moves upward along the suction tube 7 with the airflow. When the alloy powder floats with the airflow, the alloy powder is fully mixed, and the alloy powder is sprayed from the reflux pipe 9 to the bottom of the tank body 3. The high-speed sprayed alloy powder blows away the alloy powder accumulated in the outer circle of the bottom of the tank body 3 to collapse and move to the bottom of the suction tube 7. On the basis of being stirred and mixed by the stirring paddle 6, the alloy powder is floated and mixed inside the suction tube 7, thereby improving the uniformity and efficiency of the alloy powder mixing.

[0067] like Figure 3 As shown, a plurality of sleeve rods 10 are fixed around the middle outer wall of the stirring paddle 6, and an elastic slide rod 11 is slidably installed inside the sleeve rod 10. An elastic rope 12 is fixed between the end of the sleeve rod 10 close to the center of the stirring paddle 6 and the end of the elastic slide rod 11 close to the inside of the sleeve rod 10, and a ball head 13 is fixed to the end of the elastic slide rod 11 away from the sleeve rod 10; during operation, when the stirring paddle 6 rotates, the centrifugal force generated causes the elastic slide rod 11 to slide out from the inside of the sleeve rod 10, causing the elastic rope 12 to stretch, thereby expanding the stirring diameter of the stirring paddle 6; at the same time, the elastic slide rod 11 drives the ball head 13 to hit the inner wall of the tank body 3, thereby lifting the alloy powder accumulated on the outer circle of the tank body 3, thereby reducing the probability of the alloy powder accumulating on the outer circle at the bottom of the tank body 3.

[0068] like Figure 4As shown, a plurality of balls 14 are rollingly mounted on the outer ring of one end of the elastic slide bar 11 close to the sleeve rod 10, and the outer wall of the ball 14 slides with the inner wall of the sleeve rod 10; when working, when the elastic slide bar 11 slides, it drives the ball 14 to slide against the inner wall of the sleeve rod 10, and at the same time the ball 14 is blocked by the inner ring at the opening of the sleeve rod 10; the ball 14 not only reduces the friction resistance between the elastic slide bar 11 and the sleeve rod 10, but also reduces the probability of the elastic slide bar 11 slipping out of the sleeve rod 10, reduces the influence of the elastic slide bar 11 on the rotation of the stirring paddle 6 after it detaches from the sleeve rod 10, and improves safety.

[0069] like Figure 4 As shown, the end of the sleeve rod 10 is fixed with a conical rubber sleeve 15, and the inner ring of the conical rubber sleeve 15 is slidably matched with the outer ring of the elastic slide rod 11, and an elastic ring 16 is slidably installed inside the conical rubber sleeve 15; the elastic force of the elastic ring 16 makes the inner ring of the conical rubber sleeve 15 close to the outer ring of the elastic slide rod 11; when working, when the elastic slide rod 11 slides into the interior of the sleeve rod 10 under the pulling force of the elastic rope 12, the outer ring of the elastic slide rod 11 slides in contact with the inner ring of the conical rubber sleeve 15, pushing away the alloy powder contaminated on the outer wall of the elastic slide rod 11, thereby improving the cleanliness of the interior of the sleeve rod 10, and then improving the smoothness of the sliding of the elastic slide rod 11.

[0070] like Figure 2 and Figure 5 As shown, a plurality of groups of spoilers 17 are fixedly connected to the interior of the suction cylinder 7, and each group of the spoilers 17 is fixedly connected to the inner wall of the suction cylinder 7, and the spoilers 17 are at an oblique angle to the main shaft 5. During operation, when the alloy powder moves upward along the suction cylinder 7 accompanied by the airflow, the airflow is blocked and guided by the spoilers 17, so that the airflow rotates inside the suction cylinder 7, so that the alloy powders floating along the airflow collide with each other and mix, which not only improves the degree of crushing of the alloy powder, but also improves the degree of mixing of the alloy powder.

[0071] like Figure 5As shown, the outer wall of the main shaft 5 is fixed with multiple groups of flexible rods 18, and the ends of the flexible rods 18 are fixed with steel balls 19. Each group of flexible rods 18 is located above the spoiler 17. During operation, the main shaft 5 is gradually accelerated by the motor 2 until the speed of the main shaft 5 is constant. The main shaft 5 drives the flexible rods 18 to gradually bend downward and straighten toward the outer circle, so that the steel balls 19 are separated from the spoiler 17 of the next layer after hitting it. The flexible rods 18 rotate, which improves the uniform mixing of the alloy powder moving upward. degree; when the stirring is completed, the motor 2 is turned off, the upward airflow inside the suction cylinder 7 disappears, and the alloy powder inside the suction cylinder 7 falls downward, and the rotation speed of the main shaft 5 gradually decreases until it stops, so that the rotation speed of the flexible rod 18 gradually decreases, and the end of the flexible rod 18 is bent downward under the action of the gravity of the steel ball 19, so that the steel ball 19 hits the spoiler 17, and the alloy powder on the surface of the spoiler 17 is shaken off, thereby improving the cleanliness of the spoiler 17 and reducing the loss of alloy powder.

[0072] Example 2

[0073] like Figure 6 As shown, comparative example 1, wherein another embodiment of the present invention is: a plurality of rubber blocks 20 are fixedly connected around the bottom surface of the stirring paddle 6, a vertical rod 21 is fixedly connected to the bottom surface of the rubber block 20, and a sharp corner is provided at the bottom end of the vertical rod 21; when working, the stirring paddle 6 stirs the alloy powder inside the tank body 3, and the alloy powder at the bottom of the stirring paddle 6 is relatively still, so that the mixing degree of the alloy powder in this part is poor; the vertical rod 21 is acted upon by centrifugal force, so that the vertical rod 21 rotates and expands toward the outer circle, so that the vertical rod 21 stirs the alloy powder at the bottom of the stirring paddle 6, reducing the probability of alloy powder deposition at the bottom of the stirring paddle 6.

[0074] During operation: the main phase alloy and the auxiliary phase alloy are prepared respectively by induction melting and rapid solidification strip spinning process; the main phase alloy and the auxiliary phase alloy are subjected to hydrogen crushing process and air flow grinding process to prepare main phase alloy powder and auxiliary phase alloy powder; the main phase alloy powder and the auxiliary phase alloy powder are added into the interior of the tank body 3, the sealing cover 4 is fastened, the air inside the tank body 3 is evacuated, and argon gas is filled in;

[0075] The motor 2 drives the main shaft 5 to rotate through the belt drive, driving the stirring paddle 6 to stir the alloy powder inside the tank body 3; the centrifugal force generated by the rotation of the stirring paddle 6 causes the elastic slide 11 to slide out from the inside of the sleeve rod 10, causing the elastic rope 12 to stretch, thereby expanding the stirring diameter of the stirring paddle 6; at the same time, the elastic slide 11 drives the ball head 13 to hit the inner wall of the tank body 3, thereby lifting the alloy powder accumulated on the outer circle of the tank body 3;

[0076] At the same time, the main shaft 5 drives the fan blades 8 to rotate, generating an upward airflow inside the suction cylinder 7, and the stirring paddle 6 stirs the alloy powder at the bottom of the suction cylinder 7. The airflow inside the suction cylinder 7 sucks up the alloy powder at the bottom of the suction cylinder 7, so that a depression is generated at the bottom of the suction cylinder 7, so that the alloy powder in the outer circle approaches the depression, and the alloy powder moves upward along the suction cylinder 7 along with the airflow. The airflow is blocked and guided by the spoiler 17, so that the airflow rotates inside the suction cylinder 7, so that the alloy powder floating with the airflow collides and mixes with each other, and the alloy powder is fully mixed. The alloy powder is sprayed from the reflux pipe 9 to the bottom of the tank body 3, and the high-speed sprayed alloy powder blows the alloy powder accumulated in the outer circle of the bottom of the tank body 3 to collapse and move to the bottom of the suction cylinder 7. On the basis of being stirred and mixed by the stirring paddle 6, the alloy powder is floated and mixed inside the suction cylinder 7, thereby improving the uniformity and mixing efficiency of the alloy powder mixing;

[0077] When the stirring is completed, the motor 2 is turned off, the upward airflow inside the suction cylinder 7 disappears, and the alloy powder inside the suction cylinder 7 falls downward. The rotation speed of the main shaft 5 gradually decreases until it stops, so that the rotation speed of the flexible rod 18 gradually decreases. The end of the flexible rod 18 is bent downward under the weight of the steel ball 19, so that the steel ball 19 hits the spoiler 17, shaking off the alloy powder on the surface of the spoiler 17, thereby improving the cleanliness of the spoiler 17 and reducing the loss of alloy powder.

[0078] The uniformly mixed alloy powder is compacted in a magnetic field and then cold isostatically pressed to form a green body; the green body is sintered under vacuum conditions and then tempered to produce a high-abundance rare earth permanent magnet.

[0079] The above-mentioned front, back, left, right, up and down are all based on the Figure 1 As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0080] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0081] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a high-abundance rare earth permanent magnet material, characterized in that: The rare earth permanent magnet material is composed of the following raw materials in parts by weight: Main phase alloy 90-100 parts 1-5 parts of auxiliary phase alloy; The main phase alloy is composed of the following raw materials in parts by weight: 20-40 parts of rare earth elements 70-80 parts of iron 1-2 parts of Boron Other elements 0.2-2 parts; The auxiliary phase alloy is composed of the following raw materials in parts by weight: 50-60 parts of rare earth elements 40-50 parts of iron; The rare earth elements include lanthanum, cerium, praseodymium and neodymium; the other elements are one or more of cobalt, nickel, molybdenum, gallium, aluminum, copper, zirconium and niobium; The preparation method comprises the following steps: A1: The main phase alloy and auxiliary phase alloy are prepared by induction melting and rapid solidification strip spinning process respectively; A2: The main phase alloy and the auxiliary phase alloy are subjected to a hydrogen crushing process and a jet milling process to prepare a main phase alloy powder and an auxiliary phase alloy powder; A3: Use a stirring device to mix and stir the main phase alloy powder and the auxiliary phase alloy powder in an argon protective atmosphere; A4: The uniformly mixed alloy powder is compacted in a magnetic field and then cold isostatically pressed to form a green body; A5: The green body is sintered under vacuum conditions and then tempered to produce a high-abundance rare earth permanent magnet; The stirring and mixing method of the stirring device described in A3 comprises the following steps: B1: Add the main phase alloy powder and the auxiliary phase alloy powder into the interior of the tank body (3), fasten the sealing cover (4), extract the air inside the tank body (3), and fill it with argon gas; B2: Start the motor (2), drive the main shaft (5) to drive the stirring paddle 6 to stir the alloy powder inside the tank body 3, and at the same time, drive the fan blade (8) to rotate, generate an upward airflow inside the suction cylinder (7), suck up the alloy powder at the bottom of the suction cylinder (7), and the alloy powder is fully mixed inside the suction cylinder (7) along with the airflow; B3: Alloy powder is sprayed from the reflux pipe (9) to the bottom of the tank body (3). The high-speed sprayed alloy powder blows the alloy powder accumulated on the outer circle of the bottom of the tank body (3) to collapse and move to the bottom of the suction tube (7), so that the alloy powder is stirred and mixed, and the air flow is circulated to mix the alloy powder, so that the alloy powder is mixed evenly.

2. The method for preparing a high-abundance rare earth permanent magnet material according to claim 1, wherein: The stirring device comprises a support (1), a motor (2), a tank body (3), a sealing cover (4), a main shaft (5), a stirring paddle (6), a suction cylinder (7), a fan blade (8) and a return pipe (9); a support arm (1) is provided on one side of the tank body (3); the top surface of the support arm (1) is fixedly connected to the motor (2); the top surface of the tank body (3) is bolted to the sealing cover (4); the top and bottom surfaces of the support arm (1) are fixedly connected to the top surface of the sealing cover (4); the bottom surface of the sealing cover (4) is rotatably mounted with the main shaft (5); the motor (2) and the main shaft (5) are connected to each other. ) are connected by belt drive, the bottom surface of the sealing cover (4) is fixed with a suction cylinder (7), the inner ring of the suction cylinder (7) is sleeved on the outer ring of the main shaft (5), the bottom end of the main shaft (5) is fixed with a stirring paddle (6), the stirring paddle (6) is located below the suction cylinder (7), the middle outer ring of the main shaft (5) is fixed with a fan blade (8), the inner ring of the suction cylinder (7) is sleeved on the outer ring of the fan blade (8), the top side of the suction cylinder (7) is connected with a return pipe (9), the outlet of the return pipe (9) points to the bottom of the tank body (3) away from the stirring paddle (6).

3. The method for preparing a high-abundance rare earth permanent magnet material according to claim 2, wherein: A plurality of sleeve rods (10) are fixedly connected around the outer wall of the middle portion of the stirring paddle (6), an elastic slide rod (11) is slidably mounted inside the sleeve rod (10), an elastic rope (12) is fixedly connected between an end of the sleeve rod (10) close to the center of the stirring paddle (6) and an end of the elastic slide rod (11) close to the inside of the sleeve rod (10), and a ball head (13) is fixedly connected to an end of the elastic slide rod (11) away from the sleeve rod (10).

4. The method for preparing a high-abundance rare earth permanent magnet material according to claim 3, wherein: A plurality of balls (14) are rollingly mounted on the outer ring of one end of the elastic sliding rod (11) close to the sleeve rod (10), and the outer wall of the balls (14) is in sliding engagement with the inner wall of the sleeve rod (10).

5. The method for preparing a high-abundance rare earth permanent magnetic material according to claim 4, characterized in that: The end of the sleeve rod (10) is fixedly connected to a conical rubber sleeve (15), the inner ring of the conical rubber sleeve (15) is slidably matched with the outer ring of the elastic sliding rod (11), and an elastic ring (16) is slidably mounted inside the conical rubber sleeve (15).

6. The method for preparing a high-abundance rare earth permanent magnet material according to claim 2, wherein: A plurality of groups of spoilers (17) are fixedly connected to the interior of the suction cylinder (7), and each group of spoilers (17) is fixedly connected to the inner wall of the suction cylinder (7), and the spoilers (17) are at an oblique angle to the main shaft (5).

7. The method for preparing a high-abundance rare earth permanent magnetic material according to claim 6, characterized in that: Multiple groups of flexible rods (18) are fixedly connected to the outer wall of the main shaft (5), and steel balls (19) are fixedly connected to the ends of the flexible rods (18). Each group of flexible rods (18) is located above the spoiler (17).

8. The method for preparing a high-abundance rare earth permanent magnetic material according to claim 2, characterized in that: A plurality of rubber blocks (20) are fixedly connected around the bottom surface of the stirring paddle (6), a vertical rod (21) is fixedly connected to the bottom surface of the rubber block (20), and a sharp corner is provided at the bottom end of the vertical rod (21).

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