A method for preparing high coercivity rare earth permanent magnet material

Abstract

The present invention belongs to the technical field of permanent magnet material preparation, and specifically is a method for preparing a high coercive force rare earth permanent magnet material. The method comprises the following steps: S1: 46 Pr 54 ) 28 (Fe, Al) 25 B rare earth-poor alloy powder and Tb 42 (Fe, Al) 57 B rare earth alloy powder and 0.1% MgO in the remaining raw materials are fully stirred and mixed by ball milling to obtain raw material one; the sealing cavity is sealed by a sealing component, and then the sealing cavity is evacuated by a vacuum pump, so that the negative pressure inside the sealing cavity can squeeze the structural design of the sealing cover plate, thereby achieving a better sealing effect inside the sealing cavity during the sintering process of the fine embryo, and effectively solving the problem of poor sealing between the furnace body and the furnace cover during the sintering process of the fine embryo, which easily leads to poor sintering effect of the fine embryo.

Description

Technical Field

[0001] The invention belongs to the technical field of permanent magnet material preparation, in particular to a method for preparing a high coercive force rare earth permanent magnet material. Background Art

[0002] Coercive force refers to the fact that the magnetic induction intensity of a magnetic material does not return to zero when the external magnetic field returns to zero after saturation magnetization. It is an indicator of the duration of a constant material. Due to the different coercive forces of magnetic materials, magnetic materials can be divided into permanent magnetic materials and soft magnetic materials according to their coercive forces. The coercive force of permanent magnetic materials is usually greater than 1000A / m. After the material is magnetized to saturation and the external magnetic field is removed, the permanent magnetic material can still maintain a strong magnetism for a long time, so it is also called a permanent magnetic material.

[0003] A Chinese patent with publication number CN214470037U discloses a vacuum sintering furnace, which includes a furnace body, a furnace cover covering the furnace body, and a sealing ring arranged on a side of the furnace cover close to the furnace body, and the side of the sealing ring away from the furnace cover abuts against the side of the furnace body close to the furnace cover. The application has the effect of reducing the possibility of heat dissipation in the furnace body.

[0004] Since there is a gap between the furnace cover and the furnace body, heat leakage is likely to occur during the sintering process of the permanent magnetic material, making the heat inside the furnace body relatively uneven, resulting in defects in the sintering process of the permanent magnetic material, resulting in poor quality of the finished permanent magnetic material, and may even cause cracks in the prepared permanent magnetic material, making the permanent magnetic material unusable.

[0005] To this end, the present invention provides a method for preparing a high coercive force rare earth permanent magnet material. 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 method for preparing a high coercive force rare earth permanent magnet material according to the present invention, the steps of the method are as follows:

[0008] S1: 46 Pr 54 ) 28 (Fe, Al) 25 B rare earth-poor alloy powder and Tb 42 (Fe, Al) 57 The rare earth-rich alloy powder B and the remaining raw materials with a proportion of 0.1% MgO are fully stirred and mixed by ball milling to obtain raw material 1;

[0009] S2: Add DyH3 powder having a ratio of 4 wt% to the raw material 1 to the raw material 1 obtained in S1, and mix them evenly to obtain raw material 2;

[0010] S3: Orienting and forming the raw material 2 obtained in S2 under an inert gas environment to prepare a rough blank;

[0011] S4: storing the rough blank in oil, and then isostatically pressing the rough blank to prepare a powdery fine blank;

[0012] S5: The fine green body is put into the sintering equipment, and the fine green body is sintered. After the sintering is completed, the fine green body is tempered, and then the fine green body can be processed into a sintered magnet.

[0013] Preferably, the steps of using the sintering equipment described in S5 are as follows:

[0014] T1: After opening the sealing cover, the embryo is placed into the sealed cavity, and then the vacuum pump is started to extract the air inside the sealed cavity through the air guide pipe;

[0015] T2: When the fine embryo is put into the sealing cavity, the weight of the fine embryo can press the pressure plate, so that the pressure plate squeezes the air push plate through the connecting rod, so that the air on the rodless cavity side of the sliding cavity of the air push plate enters the sliding cavity of the air push plate through the air guide channel, and then pushes the air push plate to drive the sealing cover plate to deflect, so that the sealing cover plate is closed;

[0016] T3: After the sealing cover is closed, the heater can be started to perform stage-by-stage temperature sintering on the fine embryo inside the sealing cavity;

[0017] T4: After the sintering process is completed, the finished product is cooled. After cooling is completed, the vacuum pump is turned off, and then the sealing cover is opened to take out the finished product. During the process of taking out the finished product, the waste generated by sintering will leak out through the discharge port.

[0018] Preferably, the sintering equipment in S5 includes a sintering body; a plurality of sealed cavities are provided inside the sintering body; a sealing cover plate is rotatably connected to the top of the sealed cavity by a torsion spring; a heater is installed inside the sintering body; the heater is arranged at a position corresponding to the sealed cavity; a discharge port is provided at a side position of the sealed cavity; a vacuum pump is fixedly connected to the top of the sintering body; an air duct is connected to the exhaust end of the vacuum pump, and the air duct passes through the sealing cover plate and is connected to the inside of the sealed cavity; a sealing component is provided inside the sintering body; the sealing component can seal the sealed cavity; a blocking component is provided at the position of the discharge port; the blocking component can prevent the fine embryo from leaking out of the discharge port; since there is a gap between the furnace cover and the furnace body, heat leakage is likely to occur during the sintering of the permanent magnetic material, making the heat inside the furnace body relatively uneven, resulting in defects in the sintering process of the permanent magnetic material, making the finished product quality of the permanent magnetic material poor, and may even cause cracks in the prepared permanent magnetic material, resulting in the permanent magnetic material being unusable. When the fine embryo needs to be sintered, the sealing cover plate can be opened, and then the fine embryo is added into the sealed cavity. After the fine embryo is added into the sealed cavity, the sealing cover plate can be closed and sealed by the sealing component, and then the vacuum pump can be started to extract the air in the sealed cavity, so that the sealed cavity forms a vacuum state. At the same time, the negative pressure of the vacuum can make the sealing cover plate close more tightly, and then the heater can be started to sinter the fine embryo in the sealed cavity. At the same time, the temperature of the heater can be controlled to perform stage-by-stage temperature processing on the fine embryo in the sealed cavity. After the sintering process is completed, the finished product can be taken out after cooling. Then the finished product can be taken out, and the sealed cavity can be sealed by the sealing component. Then, in the process of vacuumizing the sealed cavity by the vacuum pump, the negative pressure in the sealed cavity can squeeze the structural design of the sealing cover plate, so that the sealing effect of the sealed cavity is better in the process of sintering the fine embryo, and the problem of poor sealing between the furnace body and the furnace cover when the fine embryo is sintered is effectively solved, which easily leads to poor sintering effect of the fine embryo.

[0019] Preferably, the sealing assembly includes a pressure plate; the pressure plate is slidably connected to the inside of the sealing cavity; the pressure plate is rotatably connected to the end position of the connecting rod; a blocking block is fixedly connected to the side wall of the pressure plate; a limiting groove is provided at the rotating shaft of the connecting rod; the blocking block and the limiting groove are arranged correspondingly; the other end of the connecting rod is fixedly connected to an air push plate; a spring is fixedly connected between the bottom of the air push plate and the side wall of the sintering body; an air push plate is fixedly connected to the bottom side wall of the sealing cover plate; an air guide channel is provided on the rotating cavity of the air push plate and the rodless cavity side of the air push plate sliding cavity; a blocking groove is provided on the side wall of the sintering body, and the lower side of the pressure plate contacts the top position of the blocking groove; during work, when the fine embryo is added to the inside of the sealing cavity, the fine embryo will press the pressure plate, thereby causing the higher side of the pressure plate to press the lower side, thereby causing the lower side of the pressure plate to push the blocking plate The retaining groove allows the pressure plate to press the connecting rod, and then the connecting rod presses the push plate, so that the air inside the push plate enters the rotating chamber of the air push plate through the air guide channel, and then pushes the air push plate to deflect, so that the air push plate can drive the sealing cover plate to deflect, and then cover the top of the sealing chamber, and press the pressure plate through the fine blank, so that the pressure plate drives the push plate to press down through the connecting rod, and then the air inside the rodless chamber side of the sliding chamber of the push plate can enter the rotating chamber of the air push plate through the air guide channel, and then drive the sealing cover plate to deflect. The structural design realizes the function of placing the fine blank into the sealing chamber, and then driving the sealing cover plate to close, which can make the sealing of the sealing chamber better. At the same time, the limiting groove limits the blocking block, so that the pressure plate can be kept within a certain angle during the rotation process, effectively avoiding excessive deflection of the pressure plate, which causes an impact on the fine blank processing.

[0020] Preferably, the blocking assembly includes a material baffle plate; the material baffle plate is arranged at the position corresponding to the material discharge port; the bottom of the material baffle plate is fixedly connected to a sliding plate; the sliding plate is slidably connected to the inside of the sintering machine body; a spring is fixedly connected between the bottom of the sliding plate and the side wall of the sintering machine body; the bottom of the sliding plate is fixedly connected to a stop cross bar; the side wall of the sintering machine body is rotatably connected to a stop hook through a torsion spring; the stop hook is arranged at the position corresponding to the stop cross bar; a deflection cavity is provided around the stop cross bar at the position corresponding to the stop hook; an air guide channel is provided between one side of the rodless cavity of the sliding cavity of the sliding plate and one side of the rodless cavity of the sliding cavity of the air push plate; during work, when the air push plate is pressed down, the air inside the rodless cavity of the sliding cavity of the air push plate can enter the sliding cavity of the sliding plate through the air guide channel, The sliding plate can then be pushed to move upward, and the baffle plate can be pushed to block the discharge port, thereby effectively preventing the fine embryo from leaking out of the discharge port when it is added to the sealed chamber. In the process of the sliding plate rising upward, the stop cross bar will break free from the soft stop hook, and the sliding plate can move upward. At the same time, when the air pushing plate rises upward, the air inside the rodless cavity side of the sliding cavity of the sliding plate will be extracted through the air guide channel, and then the sliding plate will be pulled back by the negative pressure and the spring, so that the stop cross bar can push the stop hook, so that the stop hook can hook the stop cross bar, so that the baffle plate will not block the discharge port, and impurities and other waste materials generated during the sintering process can flow out of the sealed chamber through the discharge port, making the inside of the sealed chamber cleaner. At the same time, the inclined pressure plate can make the waste flow out of the sealed chamber better through the discharge port.

[0021] Preferably, an arc-shaped groove is provided on the top of the pressure plate; the arc-shaped groove is provided at the top position of the side of the pressure plate away from the discharge port; during operation, when the fine embryos are put into the sealing cavity, the arc-shaped groove can make more of the fine embryos fall into the higher side of the pressure plate, so that the pressure plate away from the discharge port is heavier, so that the effect of pressing the pressure plate is better, and at the same time the arc-shaped groove can increase the space inside the sealing cavity, so that a larger amount of fine embryos can be processed inside the sealing cavity.

[0022] Preferably, the interior of the sintering body is slidably connected with an exhaust plate; a pull rod is fixedly connected to the side wall of the exhaust plate; the end of the pull rod is fixedly connected to the pull plate; a spring is fixedly connected between the exhaust plate and the side wall of the sintering body; an air guide channel is provided on the rodless cavity side of the exhaust plate sliding cavity and the rodless cavity side of the push plate sliding cavity; a first magnetic block is fixedly connected to the side wall of the pull plate; a second magnetic block is fixedly connected to the side wall of the sintering body; the first magnetic block and the second magnetic block are arranged correspondingly; during operation, when the sealing cover plate cannot be opened due to the influence of pressure, the pull rod can be pulled, The air suction plate can then draw air on the rodless cavity side of the air push plate sliding cavity through the air guide channel, and then draw air inside the rotating cavity of the air push plate through the air guide channel between the rodless cavity side of the air push plate sliding cavity and the rotating cavity of the air push plate, thereby making it easier to open the sealing cover plate. At the same time, during the sliding of the air push plate, the pull plate is fixed by the adsorption of the first magnetic block and the second magnetic block, which can effectively prevent air from entering the sliding cavity of the air suction plate during the process of the air push plate pushing the air, thereby allowing more air to enter the rotating cavity of the air push plate and the sliding cavity of the sliding plate.

[0023] Preferably, the interior of the sealing cover plate is fixedly connected with a material blocking filter through a grid frame, and the material blocking filter is arranged at a position corresponding to the end of the air guide pipe; the interior of the sealing cover plate is rotatably connected with a plurality of wind receiving plates through a rotating shaft; the ends of the wind receiving plates are fixedly connected with knocking balls; the knocking balls are arranged at positions corresponding to the grid frame of the material blocking filter; during operation, when the vacuum pump draws air from the interior of the sealed cavity, the material blocking filter can effectively prevent the fine embryos inside the sealed cavity from entering the interior of the vacuum pump, and at the same time, when the air enters the interior of the vacuum pump through the air guide pipe, the air will drive the wind receiving plate to rotate, and then the knocking ball can knock on the grid frame of the material blocking filter, causing the interior of the grid frame to vibrate, thereby allowing the fine embryos inside the material blocking filter to be shaken off by the vibration, effectively preventing the fine embryos from blocking the material blocking filter.

[0024] Preferably, an asbestos insulation net is provided between the sealing cavity and the sliding cavity of the push plate; during operation, when the heater heats the fine embryo inside the sealing cavity, the asbestos insulation net can isolate the heat, thereby effectively preventing the heat from entering the sliding cavity of the push plate, thereby effectively preventing the heat from affecting the elastic force of the spring at the bottom of the push plate.

[0025] The beneficial effects of the present invention are as follows:

[0026] 1. The method for preparing a high coercive force rare earth permanent magnet material described in the present invention seals the sealed cavity through a sealing component, and then in the process of evacuating the sealed cavity through a vacuum pump, the negative pressure inside the sealed cavity can squeeze the structural design of the sealing cover plate, thereby achieving a better sealing effect inside the sealed cavity during the sintering process of the fine embryo, and effectively solving the problem of poor sealing between the furnace body and the furnace cover during the sintering process of the fine embryo, which easily leads to poor sintering effect of the fine embryo.

[0027] 2. The method for preparing a high coercive force rare earth permanent magnet material described in the present invention presses the pressure plate through the fine embryo, and then the pressure plate drives the push plate to be pressed down through the connecting rod, so that the air inside the rodless cavity side of the sliding cavity of the push plate can enter the rotating cavity of the air push plate through the air guide channel, and then drive the sealing cover plate to deflect the structural design, realizes the function of placing the fine embryo into the interior of the sealing cavity, and then driving the sealing cover plate to close, so that the sealing performance of the sealing cavity can be better. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] Figure 1 is a process flow chart of the preparation method of the present invention;

[0030] Figure 2 is a method flow chart of a method for using the sintering equipment in the present invention;

[0031] Figure 3 It is a three-dimensional schematic diagram of the sintering machine body in the present invention;

[0032] Figure 4 It is a front cross-sectional view of the sintering machine body in the present invention;

[0033] Figure 5 yes Figure 4 A partial enlarged view of the middle A;

[0034] Figure 6 yes Figure 5 A partial enlarged view of point B in the middle;

[0035] Figure 7 yes Figure 5 A partial enlarged view of point C in the middle;

[0036] Figure 8 It is a structural schematic diagram of the sealing cover plate in the present invention;

[0037] Fig. 9 yes Figure 5 A partial enlarged view of point D in the middle;

[0038] Fig.10 yes Figure 8 A partial enlarged view of point E in the middle;

[0039] Fig.11 It is a schematic diagram of the partial structure of the sealing cover plate in the second embodiment.

[0040] In the figure: 1, sintering body; 2, sealing chamber; 3, heater; 4, sealing cover plate; 401, air push plate; 5, vacuum pump; 6, discharge port; 7, pressure plate; 701, blocking block; 8, connecting rod; 801, limiting groove; 9, air push plate; 10, material blocking plate; 11, sliding plate; 12, stop cross bar; 13, stop hook; 14, arc groove; 15, exhaust plate; 16, pull rod; 17, pull plate; 18, first magnetic block; 19, second magnetic block; 20, material blocking filter; 21, wind receiving plate; 22, knocking ball; 23, asbestos insulation net; 24, contact convex strip. DETAILED DESCRIPTION

[0041] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0042] like Figure 1 As shown, a method for preparing a high coercivity rare earth permanent magnet material according to an embodiment of the present invention comprises the following steps:

[0043] S1: La 46 Pr 5428 Fe, Al 25 B rare earth-poor alloy powder and Tb 42 Fe, Al 57 The rare earth-rich alloy powder B and the remaining raw materials with a proportion of 0.1% MgO are fully stirred and mixed by ball milling to obtain raw material 1;

[0044] S2: Add DyH3 powder having a ratio of 4 wt% to the raw material 1 to the raw material 1 obtained in S1, and mix them evenly to obtain raw material 2;

[0045] S3: Orienting and forming the raw material 2 obtained in S2 under an inert gas environment to prepare a rough blank;

[0046] S4: storing the rough blank in oil, and then isostatically pressing the rough blank to prepare a powdery fine blank;

[0047] S5: The fine green body is put into the sintering equipment, and the fine green body is sintered. After the sintering is completed, the fine green body is tempered, and then the fine green body can be processed into a sintered magnet.

[0048] like Figure 2 As shown, the steps for using the sintering equipment described in S5 are as follows:

[0049] T1: After the sealing cover plate 4 is opened, the embryo is placed into the sealed cavity 2, and then the vacuum pump 5 is started, so that the vacuum pump 5 extracts the air in the sealed cavity 2 through the air guide pipe;

[0050] T2: When the fine embryo is put into the sealing cavity 2, the weight of the fine embryo can press the pressure plate 7, so that the pressure plate 7 squeezes the air push plate 9 through the connecting rod 8, so that the air on the rodless cavity side of the sliding cavity of the air push plate 9 enters the sliding cavity of the air push plate 401 through the air guide channel, and then pushes the air push plate 401 to drive the sealing cover plate 4 to deflect, so that the sealing cover plate 4 is closed;

[0051] T3: After the sealing cover plate 4 is closed, the heater 3 can be started to perform a staged temperature sintering process on the fine embryo inside the sealing cavity 2;

[0052] T4: After the sintering process is completed, the finished product is cooled. After the cooling is completed, the vacuum pump 5 is turned off, and then the sealing cover plate 4 is opened to take out the finished product. During the process of taking out the finished product, the waste generated by sintering will leak out through the discharge port 6.

[0053] Embodiment 1

[0054] like Figure 3 to Figure 4As shown, the sintering equipment in S5 includes a sintering body 1; a plurality of sealed cavities 2 are provided inside the sintering body 1; a sealing cover plate 4 is rotatably connected to the top of the sealed cavity 2 through a torsion spring; a heater 3 is installed inside the sintering body 1; the heater 3 is arranged at a position corresponding to the sealed cavity 2; a discharge port 6 is provided at a side position of the sealed cavity 2; a vacuum pump 5 is fixedly connected to the top of the sintering body 1; an air duct is connected to the exhaust end of the vacuum pump 5, and the air duct passes through the sealing cover plate 4 and is connected to the inside of the sealed cavity 2; a sealing component is provided inside the sintering body 1; the sealing component can seal the sealed cavity 2; a blocking component is provided at the position of the discharge port 6; the blocking component can prevent the fine embryo from leaking out of the discharge port 6; during operation, when the fine embryo needs to be sintered, the sealing cover plate 4 can be opened, and then the fine embryo can be added to the inside of the sealed cavity 2. After the fine embryo is added to the inside of the sealed cavity 2, the sealing component can be used to seal the sealed cavity 2. The cover plate 4 is sealed and closed, and then the vacuum pump 5 can be started. The air inside the sealed chamber 2 is extracted by the vacuum pump 5, so that a vacuum state is formed inside the sealed chamber 2. At the same time, the negative pressure of the vacuum can make the sealing cover plate 4 close more tightly, and then the heater 3 can be started to sinter the fine embryo inside the sealed chamber 2. At the same time, the temperature of the heater 3 can be controlled to perform staged temperature processing on the fine embryo inside the sealed chamber 2. After the sintering process is completed, the finished product can be taken out after cooling, and then the finished product can be taken out, and the sealed chamber 2 can be sealed by the sealing component. In the process of evacuating the sealed chamber 2 by the vacuum pump 5, the negative pressure inside the sealed chamber 2 can squeeze the structural design of the sealing cover plate 4, so that the sealing effect inside the sealed chamber 2 is better achieved during the sintering process of the fine embryo, and the problem of poor sealing between the furnace body and the furnace cover during the sintering process of the fine embryo is easily caused to have a poor sintering effect on the fine embryo.

[0055] like Figure 4 , Figure 5 , Figure 6 and Figure 8As shown, the sealing assembly includes a pressure plate 7; the pressure plate 7 is slidably connected to the inside of the sealing cavity 2; the pressure plate 7 is rotatably connected to the end position of the connecting rod 8; a blocking block 701 is fixedly connected to the side wall of the pressure plate 7; a limiting groove 801 is provided at the rotating shaft of the connecting rod 8; the blocking block 701 and the limiting groove 801 are arranged correspondingly; the other end of the connecting rod 8 is fixedly connected to a push plate 9; a spring is fixedly connected between the bottom of the push plate 9 and the side wall of the sintering machine body 1; An air push plate 401 is fixedly connected to the bottom side wall of the sealing cover plate 4; an air guide channel is provided on the rotating cavity of the air push plate 401 and the rodless cavity side of the sliding cavity of the air push plate 9; a blocking groove is provided on the side wall of the sintering body 1, and the lower side of the pressure plate 7 is in contact with the top position of the blocking groove; during operation, when the fine embryo is added into the inside of the sealing cavity 2, the fine embryo will press the pressure plate 7, thereby causing the higher side of the pressure plate 7 to press the lower side, thereby causing the lower side of the pressure plate 7 to push the blocking groove. The retaining groove allows the pressure plate 7 to press the connecting rod 8, and then the connecting rod 8 presses the push plate 9, so that the air inside the push plate 9 enters the rotating chamber of the air push plate 401 through the air guide channel, and then pushes the air push plate 401 to deflect, so that the air push plate 401 can drive the sealing cover plate 4 to deflect, and then cover the top of the sealing chamber 2, and press the pressure plate 7 through the fine embryo, so that the pressure plate 7 drives the push plate 9 to press down through the connecting rod 8, so that the air inside the rodless chamber side of the sliding chamber of the push plate 9 can enter the rotating chamber of the air push plate 401 through the air guide channel, and then drive the sealing cover plate 4 to deflect. The structural design realizes the function of placing the fine embryo into the interior of the sealing chamber 2, and then driving the sealing cover plate 4 to close, which can make the sealing of the sealing chamber 2 better. At the same time, the limiting groove 801 limits the blocking block 701, so that the pressure plate 7 can be kept within a certain angle during the rotation process, effectively avoiding excessive deflection of the pressure plate 7, which causes an impact on the fine embryo processing.

[0056] like Figure 7As shown, the blocking assembly includes a baffle plate 10; the baffle plate 10 is arranged at the position corresponding to the discharge port 6; the bottom of the baffle plate 10 is fixedly connected to a sliding plate 11; the sliding plate 11 is slidably connected to the inside of the sintering body 1; a spring is fixedly connected between the bottom of the sliding plate 11 and the side wall of the sintering body 1; a stop cross bar 12 is fixedly connected to the bottom of the sliding plate 11; a stop hook 13 is rotatably connected to the side wall of the sintering body 1 through a torsion spring; the stop hook 13 is arranged at the position corresponding to the stop cross bar 12; a deflection cavity is opened around the stop cross bar 12 at the position corresponding to the stop hook 13; an air guide channel is opened between the rodless cavity side of the sliding cavity of the sliding plate 11 and the rodless cavity side of the sliding cavity of the push plate 9; during work, when the push plate 9 is pressed down, the air inside the rodless cavity of the sliding cavity of the push plate 9 can enter the sliding cavity of the sliding plate 11 through the air guide channel, and enter When the air pushing plate 9 is lifted up, the air inside the rodless cavity side of the sliding cavity of the sliding plate 11 is extracted through the air guide channel, and then the sliding plate 11 is pulled back by the negative pressure and the spring, so that the stopper 12 can push the stopper 13, so that the stopper 13 can hook the stopper 12, so that the baffle plate 10 will not block the discharge port 6, so that the impurities and other waste materials generated during the sintering process can flow out of the sealed cavity 2 through the discharge port 6, making the inside of the sealed cavity 2 cleaner, and at the same time, the inclined pressure plate 7 can make the waste flow out of the sealed cavity 2 through the discharge port 6 better.

[0057] like Figure 5 As shown, an arc-shaped groove 14 is provided at the top of the pressure plate 7; the arc-shaped groove 14 is provided at the top position of the side of the pressure plate 7 away from the discharge port 6; during operation, when the fine embryos are put into the sealing cavity 2, the arc-shaped groove 14 can make more of the fine embryos fall into the higher side of the pressure plate 7, so that the weight of the pressure plate 7 away from the discharge port 6 is heavier, so that the effect of pressing the pressure plate 7 is better, and at the same time, the arc-shaped groove 14 can increase the space inside the sealing cavity 2, so that the amount of fine embryos processed inside the sealing cavity 2 can be larger.

[0058] like Figure 5 and Fig. 9As shown, the interior of the sintering body 1 is slidably connected with an exhaust plate 15; a pull rod 16 is fixedly connected to the side wall of the exhaust plate 15; a pull plate 17 is fixedly connected to the end of the pull rod 16; a spring is fixedly connected between the exhaust plate 15 and the side wall of the sintering body 1; an air guide channel is provided on the rodless cavity side of the sliding cavity of the exhaust plate 15 and the rodless cavity side of the sliding cavity of the push plate 9; a first magnetic block 18 is fixedly connected to the side wall of the pull plate 17; a second magnetic block 19 is fixedly connected to the side wall of the sintering body 1; the first magnetic block 18 and the second magnetic block 19 are arranged correspondingly; during operation, when the sealing cover plate 4 cannot be opened due to the influence of pressure, it can be opened by pulling the pull rod 1 6, so that the exhaust plate 15 can extract the air on the rodless cavity side of the sliding cavity of the air push plate 9 through the air guide channel, and then the air inside the rotating cavity of the air push plate 401 can be extracted through the air guide channel between the rodless cavity side of the sliding cavity of the air push plate 9 and the rotating cavity of the air push plate 401, so that the sealing cover plate 4 can be opened more conveniently. At the same time, during the sliding of the air push plate 9, the pull plate 17 is fixed by the adsorption of the first magnetic block 18 and the second magnetic block 19, which can effectively prevent the air from entering the sliding cavity of the exhaust plate 15 during the process of the air push plate 9 pushing the air, so that more air can enter the rotating cavity of the air push plate 401 and the sliding cavity of the sliding plate 11.

[0059] like Fig.10 As shown, the interior of the sealing cover plate 4 is fixedly connected with a material blocking filter 20 through a grid frame, and the material blocking filter 20 is arranged at a position corresponding to the end of the air guide pipe; the interior of the sealing cover plate 4 is rotatably connected with a plurality of wind receiving plates 21 through a rotating shaft; the end of the wind receiving plate 21 is fixedly connected with a knocking ball 22; the knocking ball 22 is arranged at a position corresponding to the grid frame of the material blocking filter 20; when working, when the vacuum pump 5 draws air from the interior of the sealing chamber 2, the material blocking filter 20 can effectively prevent the fine embryos inside the sealing chamber 2 from entering the interior of the vacuum pump 5, and at the same time, when the air enters the interior of the vacuum pump 5 through the air guide pipe, the air will drive the wind receiving plate 21 to rotate, and then the knocking ball 22 can knock on the grid frame of the material blocking filter 20, so that the interior of the grid frame vibrates, so that the fine embryos inside the material blocking filter 20 can be shaken off by vibration, effectively preventing the fine embryos from blocking the material blocking filter 20.

[0060] like Figure 5 As shown, an asbestos insulation net 23 is provided between the sealing cavity 2 and the sliding cavity of the air pushing plate 9; during operation, when the heater 3 heats the fine embryo inside the sealing cavity 2, the asbestos insulation net 23 can isolate the heat, thereby effectively preventing the heat from entering the sliding cavity of the air pushing plate 9, thereby effectively preventing the heat from affecting the elastic force of the spring at the bottom of the air pushing plate 9.

[0061] Embodiment 2

[0062] like Fig.11 As shown, compared with Example 1, another implementation of the present invention is that: the side wall of the sealing cover plate 4 away from the air push plate 401 is an arc-shaped setting facing the side wall of the sintering body 1; a groove at the end of the sealing cover plate 4 is provided on the side wall of the sintering body 1; the arc-shaped side wall of the sealing cover plate 4 is fixedly connected with a contact convex strip 24; a strip groove is provided on the side wall of the sintering body 1 at a position corresponding to the contact convex strip 24; during operation, when the sealing cover plate 4 blocks the sealing cavity 2, the arc-shaped side wall of the sealing cover plate 4 fits with the side wall of the sintering body 1, which can increase the fitting area between the sealing cover plate 4 and the sintering body 1, so that the sealing cover plate 4 can better seal the sintering body 1, and at the same time, the contact convex strip 24 is engaged with the strip groove, which can increase the contact area between the sealing cover plate 4 and the sintering body 1, so that the sealing cover plate 4 can better seal the sealing cavity 2.

[0063] During operation, when it is necessary to sinter the fine embryo, the sealing cover plate 4 can be opened, and then the fine embryo is added into the sealed cavity 2. After the fine embryo is added into the sealed cavity 2, the sealing cover plate 4 can be closed and sealed by the sealing component, and then the vacuum pump 5 can be started to extract the air in the sealed cavity 2, so that a vacuum state is formed in the sealed cavity 2. At the same time, the negative pressure of the vacuum can make the sealing cover plate 4 close more tightly, and then the heater 3 can be started to sinter the fine embryo in the sealed cavity 2. At the same time, the temperature of the heater 3 can be controlled to sinter the fine embryo in the sealed cavity 2. After the staged temperature processing is completed, the finished product can be taken out after cooling down. Then the finished product can be taken out, and the sealing cavity 2 is sealed by the sealing component. Then, in the process of evacuating the sealing cavity 2 by the vacuum pump 5, the negative pressure inside the sealing cavity 2 can be squeezed by the structural design of the sealing cover plate 4, so that the sealing cavity 2 can have a better sealing effect during the sintering process of the fine embryo, and the problem of poor sealing between the furnace body and the furnace cover during the sintering process of the fine embryo is effectively solved, which easily leads to poor sintering effect of the fine embryo.

[0064] When the fine embryo is added to the inside of the sealing cavity 2, the fine embryo will press the pressure plate 7, so that the higher side of the pressure plate 7 presses the lower side, so that the lower side of the pressure plate 7 pushes the blocking groove, so that the pressure plate 7 presses the connecting rod 8, and then the connecting rod 8 presses the air push plate 9, so that the air inside the air push plate 9 enters the rotating cavity of the air push plate 401 through the air guide channel, and then pushes the air push plate 401 to deflect, so that the air push plate 401 can drive the sealing cover plate 4 to deflect, and then cover the top of the sealing cavity 2, and the fine embryo presses the pressure plate 7, so that the pressure plate 7 is connected through the connecting rod 8. The rod 8 drives the air push plate 9 to be pressed downward, so that the air inside the rodless cavity side of the sliding cavity of the air push plate 9 can enter the rotating cavity of the air push plate 401 through the air guide channel, thereby driving the structural design of the sealing cover plate 4 to deflect, realizing the function of placing the fine embryo into the sealing cavity 2, thereby driving the sealing cover plate 4 to close, and making the sealing of the sealing cavity 2 better. At the same time, the limiting groove 801 limits the blocking block 701, so that the pressure plate 7 can be kept within a certain angle during the rotation process, effectively avoiding excessive deflection of the pressure plate 7, which will cause an impact on the processing of the fine embryo.

[0065] When the air pushing plate 9 is pressed down, the air inside the rodless cavity of the sliding cavity of the air pushing plate 9 can enter the sliding cavity of the sliding plate 11 through the air guiding channel, and then the sliding plate 11 can be pushed to move upward, and the material blocking plate 10 can be pushed to cover the discharge port 6, so as to effectively prevent the fine embryos from leaking from the discharge port 6 when they are added into the sealing cavity 2. In the process of the sliding plate 11 rising upward, the stop cross bar 12 will break away from the soft stop hook 13, so that the sliding plate 11 can move upward. At the same time, when the air pushing plate 9 rises upward, it will pass The air inside the rodless cavity side of the sliding cavity of the sliding plate 11 is extracted through the air guide channel, and then the sliding plate 11 is pulled back by the negative pressure and the spring, so that the stop cross bar 12 can push the stop hook 13, so that the stop hook 13 can hook the stop cross bar 12, so that the baffle plate 10 will not block the discharge port 6, so that impurities and other waste materials generated during the sintering process can flow out of the sealed cavity 2 through the discharge port 6, making the inside of the sealed cavity 2 cleaner, and at the same time, the inclined pressure plate 7 can make the waste material flow out of the sealed cavity 2 better through the discharge port 6.

[0066] When the fine embryos are put into the sealing cavity 2, the arc-shaped groove 14 can make the fine embryos fall more on the higher side of the pressure plate 7, so that the pressure plate 7 can be heavier on the side away from the discharge port 6, so that the effect of pressing the pressure plate 7 can be better. At the same time, the arc-shaped groove 14 can increase the space inside the sealing cavity 2, so that a larger amount of fine embryos can be processed inside the sealing cavity 2.

[0067] When the sealing cover plate 4 cannot be opened due to the influence of pressure, the pull rod 16 can be pulled to allow the air extraction plate 15 to extract the air on the rodless cavity side of the sliding cavity of the air pushing plate 9 through the air guide channel, and then the air inside the rotating cavity of the air pushing plate 401 can be extracted through the air guide channel between the rodless cavity side of the sliding cavity of the air pushing plate 9 and the rotating cavity of the air pushing plate 401, so that the sealing cover plate 4 can be opened more conveniently. At the same time, during the sliding of the air pushing plate 9, the pull plate 17 is fixed by the adsorption of the first magnetic block 18 and the second magnetic block 19, which can effectively prevent the air from entering the sliding cavity of the air extraction plate 15 during the process of the air pushing plate 9 pushing the air, so that more air can enter the rotating cavity of the air pushing plate 401 and the sliding cavity of the sliding plate 11.

[0068] When the vacuum pump 5 draws air from the inside of the sealed chamber 2, the material blocking filter 20 can effectively prevent the fine embryos in the sealed chamber 2 from entering the inside of the vacuum pump 5. At the same time, when the air enters the inside of the vacuum pump 5 through the air duct, the air will drive the wind receiving plate 21 to rotate, and then the knocking ball 22 can knock on the grid of the material blocking filter 20, causing the inside of the grid to vibrate, so that the fine embryos in the material blocking filter 20 can be shaken off by the vibration, effectively preventing the fine embryos from blocking the material blocking filter 20.

[0069] When the heater 3 heats the fine embryo inside the sealed cavity 2, the asbestos insulation net 23 can isolate the heat, thereby effectively preventing the heat from entering the sliding cavity of the push plate 9, thereby effectively preventing the heat from affecting the elastic force of the spring at the bottom of the push plate 9.

[0070] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. 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.

[0071] 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" and the like indicate orientations or positional relationships based on the orientations or positional relationships 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 should not be understood as limiting the scope of protection of the present invention.

[0072] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for preparing a high coercive force rare earth permanent magnet material, characterized in that: The steps of this method are as follows: S1: 46 Pr 54 ) 28 (Fe, Al) 25 B rare earth-poor alloy powder and Tb 42 (Fe, Al) 57 The rare earth-rich alloy powder B and the remaining raw materials with a proportion of 0.1% MgO are fully stirred and mixed by ball milling to obtain raw material 1; S2: Add DyH3 powder having a ratio of 4 wt% to the raw material 1 to the raw material 1 obtained in S1, and mix them evenly to obtain raw material 2; S3: Orienting and forming the raw material 2 obtained in S2 under an inert gas environment to prepare a rough blank; S4: storing the rough blank in oil, and then isostatically pressing the rough blank to prepare a powdery fine blank; S5: putting the fine green sheet into the sintering equipment, sintering the fine green sheet, and tempering the fine green sheet after sintering, so that the fine green sheet can be processed into a sintered magnet; The steps for using the sintering equipment described in S5 are as follows: T1: After the sealing cover plate (4) is opened, the embryo is placed into the sealed cavity (2), and then the vacuum pump (5) is started, so that the vacuum pump (5) extracts the air inside the sealed cavity (2) through the air guide pipe; T2: When the fine embryo is put into the sealing cavity (2), the weight of the fine embryo can press the pressure plate (7), so that the pressure plate (7) squeezes the air push plate (9) through the connecting rod (8), thereby allowing the air on the rodless cavity side of the sliding cavity of the air push plate (9) to enter the sliding cavity of the air push plate (401) through the air guide channel, thereby pushing the air push plate (401) to drive the sealing cover plate (4) to deflect, thereby closing the sealing cover plate (4); T3: After the sealing cover plate (4) is closed, the heater (3) can be started to perform a staged temperature sintering process on the fine embryo inside the sealing cavity (2); T4: After the sintering process is completed, the finished product is cooled. After the cooling is completed, the vacuum pump (5) is turned off, and then the sealing cover plate (4) is opened to take out the finished product. During the process of taking out the finished product, the waste generated by the sintering will leak out through the discharge port (6); The sintering equipment in S5 comprises a sintering machine body (1); a plurality of sealed cavities (2) are provided inside the sintering machine body (1); a sealing cover plate (4) is rotatably connected to the top of the sealed cavity (2) via a torsion spring; a heater (3) is installed inside the sintering machine body (1); the heater (3) is arranged at a position corresponding to the sealed cavity (2); a discharge port (6) is provided at a side position of the sealed cavity (2); a vacuum pump (5) is fixedly connected to the top of the sintering machine body (1); an air duct is connected to the air suction end of the vacuum pump (5), and the air duct passes through the sealing cover plate (4) and is connected to the inside of the sealed cavity (2); a sealing component is provided inside the sintering machine body (1); the sealing component can seal the sealed cavity (2); a blocking component is provided at the position of the discharge port (6); the blocking component can prevent the fine embryo from leaking out of the discharge port (6).

2. The method for preparing a high coercivity rare earth permanent magnet material according to claim 1, characterized in that: The sealing assembly comprises a pressure plate (7); the pressure plate (7) is slidably connected to the inside of the sealing cavity (2); the pressure plate (7) is rotatably connected to the end position of the connecting rod (8); a blocking block (701) is fixedly connected to the side wall of the pressure plate (7); a limiting groove (801) is provided at the rotating shaft of the connecting rod (8); the blocking block (701) and the limiting groove (801) are arranged correspondingly; the other end of the connecting rod (8) is fixedly connected to an air push plate (9); a spring is fixedly connected between the bottom of the air push plate (9) and the side wall of the sintering machine body (1); an air push plate (401) is fixedly connected to the bottom side wall of the sealing cover plate (4); an air guide channel is provided on the side of the rodless cavity of the rotating cavity of the air push plate (401) and the sliding cavity of the air push plate (9); a blocking groove is provided on the side wall of the sintering machine body (1), and the lower side of the pressure plate (7) contacts the top position of the blocking groove.

3. The method for preparing a high coercive force rare earth permanent magnet material according to claim 2, characterized in that: The blocking assembly comprises a baffle plate (10); the baffle plate (10) is arranged at a position corresponding to the discharge port (6); a sliding plate (11) is fixedly connected to the bottom of the baffle plate (10); the sliding plate (11) is slidably connected to the inside of the sintering machine body (1); a spring is fixedly connected between the bottom of the sliding plate (11) and the side wall of the sintering machine body (1); a stop cross bar (12) is fixedly connected to the bottom of the sliding plate (11); a stop hook (13) is rotatably connected to the side wall of the sintering machine body (1) through a torsion spring; the stop hook (13) is arranged at a position corresponding to the stop cross bar (12); a deflection cavity is provided around the stop cross bar (12) at a position corresponding to the stop hook (13); an air guide channel is provided between the rodless cavity side of the sliding cavity of the sliding plate (11) and the rodless cavity side of the sliding cavity of the air push plate (9).

4. The method for preparing a high coercivity rare earth permanent magnet material according to claim 3, characterized in that: An arc-shaped groove (14) is provided at the top of the pressure plate (7); the arc-shaped groove (14) is provided at a top position on a side of the pressure plate (7) away from the discharge port (6).

5. The method for preparing a high coercive force rare earth permanent magnet material according to claim 4, characterized in that: The sintering machine body (1) is internally slidably connected with an exhaust plate (15); a pull rod (16) is fixedly connected to the side wall of the exhaust plate (15); a pull plate (17) is fixedly connected to the end of the pull rod (16); a spring is fixedly connected between the exhaust plate (15) and the side wall of the sintering machine body (1); an air guide channel is provided on the rodless cavity side of the sliding cavity of the exhaust plate (15) and the rodless cavity side of the sliding cavity of the push plate (9); a first magnetic block (18) is fixedly connected to the side wall of the pull plate (17); a second magnetic block (19) is fixedly connected to the side wall of the sintering machine body (1); the first magnetic block (18) and the second magnetic block (19) are arranged correspondingly.

6. The method for preparing a high coercive force rare earth permanent magnet material according to claim 5, characterized in that: A material blocking filter (20) is fixedly connected to the interior of the sealing cover plate (4) via a mesh frame, and the material blocking filter (20) is arranged at a position corresponding to the end of the air guide pipe; a plurality of wind receiving plates (21) are rotatably connected to the interior of the sealing cover plate (4) via a rotating shaft; a knocking ball (22) is fixedly connected to the end of the wind receiving plate (21); and the knocking ball (22) is arranged at a position of the mesh frame corresponding to the material blocking filter (20).

7. The method for preparing a high coercive force rare earth permanent magnetic material according to claim 6, characterized in that: An asbestos heat insulation net (23) is provided between the sealing cavity (2) and the sliding cavity of the air pushing plate (9).

8. The method for preparing a high coercive force rare earth permanent magnet material according to claim 7, characterized in that: The side wall of the sealing cover plate (4) away from the air push plate (401) is arranged in an arc shape facing the side wall of the sintering machine body (1); a groove for the end of the sealing cover plate (4) is provided on the side wall of the sintering machine body (1); a contact convex strip (24) is fixedly connected to the arc-shaped side wall of the sealing cover plate (4); and a strip groove is provided on the side wall of the sintering machine body (1) at a position corresponding to the contact convex strip (24).

Images