CN112071545B - Surface treatment method for improving coercive force of neodymium iron boron substrate - Google Patents
Surface treatment method for improving coercive force of neodymium iron boron substrate Download PDFInfo
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- CN112071545B CN112071545B CN202010904377.5A CN202010904377A CN112071545B CN 112071545 B CN112071545 B CN 112071545B CN 202010904377 A CN202010904377 A CN 202010904377A CN 112071545 B CN112071545 B CN 112071545B
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- 229910001172 neodymium magnet Inorganic materials 0.000 title claims abstract description 54
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 239000000758 substrate Substances 0.000 title claims abstract description 15
- 238000004381 surface treatment Methods 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000009792 diffusion process Methods 0.000 claims abstract description 54
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 15
- 239000000956 alloy Substances 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 239000011259 mixed solution Substances 0.000 claims abstract description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000000243 solution Substances 0.000 claims abstract description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims abstract description 9
- 238000007738 vacuum evaporation Methods 0.000 claims abstract description 6
- 239000002253 acid Substances 0.000 claims abstract description 4
- 230000004913 activation Effects 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims abstract description 4
- 238000001035 drying Methods 0.000 claims abstract description 4
- 238000001704 evaporation Methods 0.000 claims abstract description 4
- 238000004544 sputter deposition Methods 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims abstract description 4
- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 4
- 238000005406 washing Methods 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 18
- 238000005485 electric heating Methods 0.000 claims description 17
- 239000011229 interlayer Substances 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 238000000605 extraction Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 239000000696 magnetic material Substances 0.000 claims description 4
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 3
- HVUMOYIDDBPOLL-XWVZOOPGSA-N Sorbitan monostearate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O HVUMOYIDDBPOLL-XWVZOOPGSA-N 0.000 claims description 3
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 3
- 230000003044 adaptive effect Effects 0.000 claims 1
- 238000002156 mixing Methods 0.000 claims 1
- 229910052761 rare earth metal Inorganic materials 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- 150000002910 rare earth metals Chemical class 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000002344 surface layer Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001755 magnetron sputter deposition Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000005662 electromechanics Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Hard Magnetic Materials (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
The invention belongs to the field of neodymium iron boron production, and particularly discloses a surface treatment method for improving coercive force of a neodymium iron boron substrate, which comprises the following specific steps: s1: oil removal, acid washing and activation treatment are carried out on the sintered NdFeB magnet base material; s2: forming an aluminum bottom film on the surface of the processed neodymium-iron-boron magnet by using an ion sputtering instrument, and then heating and evaporating alloy under a vacuum condition by using a vacuum evaporation device to form a vacuum aluminized layer arranged on the surface of the neodymium-iron-boron magnet; s3: placing Tb 0.27Dy0.73Fe2 alloy powder into the solution, and fully stirring to form a mixed solution; s4: coating the mixed solution on the surface of a neodymium-iron-boron magnet, and performing diffusion treatment on the neodymium-iron-boron magnet by using a thermal diffusion treatment device; s5: and (5) carrying out ultrasonic treatment and then drying. The aluminum mould formed by the method has excellent corrosion resistance; the neodymium-iron-boron magnet is subjected to diffusion treatment by using the thermal diffusion treatment device, so that the coercive force of the manufactured neodymium-iron-boron magnet is obviously improved, and the utilization rate of heavy rare earth is higher.
Description
Technical Field
The invention relates to the field of neodymium iron boron production, in particular to a surface treatment method for improving coercive force of a neodymium iron boron substrate.
Background
The neodymium iron boron permanent magnet is a permanent magnet material with the best magnetic performance at present, is widely applied to the fields of electronic information, electromechanics, instruments, medical appliances and the like, and is one of the fastest growing magnetic materials. In recent years, with the accelerated development of technology, the popularization speed and application range of sintered neodymium-iron-boron magnets in high-end fields such as new energy automobiles, variable frequency compressors, wind power generation and the like are rapidly expanded. These fields all require sintered neodymium-iron-boron magnets with high comprehensive magnetic properties, in particular high remanence and high coercivity. Therefore, how to increase the coercivity of the high-neodymium-iron-boron substrate becomes a problem to be solved.
Disclosure of Invention
The invention aims to provide a surface treatment method for improving coercive force of a neodymium iron boron substrate so as to solve the problems in the background art.
In order to achieve the above purpose, the present invention provides the following technical solutions: a surface treatment method for coercive force of a high NdFeB substrate comprises the following specific steps:
s1: oil removal, acid washing and activation treatment are carried out on the sintered NdFeB magnet base material;
s2: forming an aluminum bottom film on the surface of the processed neodymium-iron-boron magnet by using an ion sputtering instrument, and then heating and evaporating alloy under a vacuum condition by using a vacuum evaporation device to form a vacuum aluminized layer arranged on the surface of the neodymium-iron-boron magnet;
S3: placing Tb 0.27Dy0.73Fe2 alloy powder into the solution, and fully stirring to form a mixed solution;
s4: coating the mixed solution on the surface of a neodymium-iron-boron magnet, and performing diffusion treatment on the neodymium-iron-boron magnet by using a thermal diffusion treatment device;
s5: and (3) placing the magnet subjected to diffusion treatment into ultrasonic equipment for ultrasonic treatment, and then drying to finish the surface treatment of the neodymium iron boron substrate.
Preferably, in the step S3, the solution is ethanol, span-60, tetraethoxysilane and silane coupling agent KH560 according to the ratio of 100-110:1.1-1.2: 6-7:30-35.
Preferably, in the step S3, the ratio of the Tb 0.27Dy0.73Fe2 alloy powder to the solution is 0.9-1.1:1.
Preferably, the thermal diffusion treatment device comprises a base, wherein the periphery of the top of the base extends upwards to form a sleeve, an diffusion treatment cover is adaptively embedded in the sleeve and is of a cylindrical structure with a closed top surface and an open bottom surface, a heating seat is arranged at the top of the diffusion treatment cover, and an electric heating pipe arranged on the heating seat is arranged in the diffusion treatment cover; the electric heating pipes are surrounded to form a cylindrical structure, a plurality of layers are arranged at intervals from inside to outside, and an diffusion interlayer cavity is formed between two adjacent layers of electric heating pipes; the bottom of the sleeve is provided with a turntable, a tray is arranged on the turntable, positioning grooves with annular inward sinking structures are arranged on the tray corresponding to the positions of the diffusion interlayer cavities, and neodymium iron boron base materials which are annularly distributed and obtained in the step S5 are placed in the positioning grooves; and two sides of the diffusion treatment cover are respectively provided with a vacuum extraction opening and a pressure gauge.
Preferably, a driving motor is arranged in the base, and the output end of the driving motor is upwards and vertically connected with the center of the turntable.
Preferably, the tray is made of a magnetic material that magnetically attracts the neodymium-iron-boron substrate.
Preferably, a rubber sealing layer is adhered to the inner wall of the sleeve, lug plates are symmetrically arranged on two sides of the diffusion treatment cover, mounting plates are symmetrically arranged on two sides of the base under the two lug plates, a hydraulic telescopic rod is respectively mounted on the two mounting plates, and output ends of the two hydraulic telescopic rods are respectively and fixedly connected with the corresponding lug plates.
Preferably, the bottom surface of the tray is provided with a plurality of positioning blocks with raised structures, and the top surface of the turntable is correspondingly provided with positioning grooves embedded by the positioning blocks.
Preferably, the base is provided with a control panel, and the control panel is respectively connected with the electric heating pipe, the driving motor and the control end of the hydraulic telescopic rod.
Compared with the prior art, the invention has the beneficial effects that:
1. According to the invention, an aluminum bottom film is formed on the surface of a magnet through magnetron sputtering, and then a vacuum aluminized layer is formed through a vacuum evaporation mode, so that the formed aluminum die has excellent corrosion resistance; according to the invention, a certain amount of Tb 0.27Dy0.73Fe2 alloy powder is dissolved to prepare a mixed solution, then the mixed solution is coated on the surface of the neodymium-iron-boron magnet, the neodymium-iron-boron magnet is subjected to diffusion treatment by utilizing a thermal diffusion treatment device, the Tb 0.27Dy0.73Fe2 alloy coated on the surface layer of the magnet can diffuse into the surface layer area of the magnet, heavy rare earth elements in the coating layer can diffuse into the interior of the magnet, the microstructure of the magnet is improved together, the boundary structure of a magnetic phase is optimized, the purpose of improving the coercive force is achieved, the coercive force of the manufactured neodymium-iron-boron magnet is obviously improved, and the utilization rate of the heavy rare earth is higher.
2. The invention provides a thermal diffusion treatment device, which utilizes a multi-layer electric heating pipe to surround a heating mode to form a plurality of diffusion interlayer cavities, can heat the inner side and the outer side of a magnet simultaneously, has uniform heat distribution, is matched with a tray for placing and treating the magnet in batches, uniformly heats the surface of the magnet under the auxiliary effect of a turntable, and has good diffusion effect.
Drawings
FIG. 1 is a schematic diagram of the thermal diffusion treatment device of the present invention;
FIG. 2 is a schematic diagram showing the distribution of the electric heating tube and the NdFeB substrate according to the present invention;
FIG. 3 is a schematic view showing a specific structure of the tray of the present invention;
fig. 4 is a schematic diagram of an assembly structure of a tray and a turntable according to the present invention.
In the figure: 1. a base; 2. a sleeve; 3. an diffusion treatment cover; 4. a heating seat; 5. an electric heating tube; 6. an diffusion interlayer cavity; 7. a turntable; 8. a driving motor; 9. a tray; 10. a positioning groove; 11. a positioning block; 12. a rubber sealing layer; 13. a vacuum extraction opening; 14. a pressure gauge; 15. ear plates; 16. a mounting plate; 17. a hydraulic telescopic rod.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the azimuth or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Example 1: the invention provides a technical scheme that: a surface treatment method for coercive force of a high NdFeB substrate comprises the following specific steps:
s1: oil removal, acid washing and activation treatment are carried out on the sintered NdFeB magnet base material;
s2: forming an aluminum bottom film on the surface of the processed neodymium-iron-boron magnet by using an ion sputtering instrument, and then heating and evaporating alloy under a vacuum condition by using a vacuum evaporation device to form a vacuum aluminized layer arranged on the surface of the neodymium-iron-boron magnet;
S3: placing Tb 0.27Dy0.73Fe2 alloy powder into the solution, and fully stirring to form a mixed solution;
s4: coating the mixed solution on the surface of a neodymium-iron-boron magnet, and performing diffusion treatment on the neodymium-iron-boron magnet by using a thermal diffusion treatment device;
s5: and (3) placing the magnet subjected to diffusion treatment into ultrasonic equipment for ultrasonic treatment, and then drying to finish the surface treatment of the neodymium iron boron substrate.
In the embodiment, in the step S3, the solution is ethanol, span-60, tetraethoxysilane and a silane coupling agent KH560 according to the ratio of 100-110:1.1-1.2: 6-7:30-35.
In the embodiment, in the step S3, the ratio of the Tb 0.27Dy0.73Fe2 alloy powder to the solution is 0.9-1.1:1.
Firstly, forming an aluminum bottom film on the surface of a magnet through magnetron sputtering, and then forming a vacuum aluminized layer through a vacuum evaporation mode, wherein the formed aluminum die has excellent corrosion resistance; according to the invention, a certain amount of Tb 0.27Dy0.73Fe2 alloy powder is dissolved to prepare a mixed solution, then the mixed solution is coated on the surface of the neodymium-iron-boron magnet, the neodymium-iron-boron magnet is subjected to diffusion treatment by utilizing a thermal diffusion treatment device, the Tb 0.27Dy0.73Fe2 alloy coated on the surface layer of the magnet can diffuse into the surface layer area of the magnet, heavy rare earth elements in the coating layer can diffuse into the interior of the magnet, the microstructure of the magnet is improved together, the boundary structure of a magnetic phase is optimized, the purpose of improving the coercive force is achieved, the coercive force of the manufactured neodymium-iron-boron magnet is obviously improved, and the utilization rate of the heavy rare earth is higher.
Example 2: referring to fig. 1-4, the thermal diffusion treatment device includes a base 1, a sleeve 2 extending upward from the top periphery of the base, a diffusion treatment cover 3 embedded in the sleeve 2, which is a cylindrical structure with a closed top surface and an open bottom surface, a heating seat 4 mounted on the top of the diffusion treatment cover 3, and an electric heating tube 5 mounted on the heating seat 4 inside the diffusion treatment cover 3; the electric heating pipes 5 are surrounded to form a cylindrical structure, a plurality of layers are arranged at intervals from inside to outside, and an diffusion interlayer cavity 6 is formed between two adjacent layers of electric heating pipes 5; the bottom of the sleeve 2 is provided with a turntable 7, a tray 9 is arranged on the turntable 7, positioning grooves 10 with annular inward sinking structures are arranged on the tray 9 corresponding to the positions of the diffusion interlayer cavities 6, and neodymium iron boron base materials which are annularly distributed and obtained in the step S5 are placed in the positioning grooves 10; the two sides of the diffusion treatment cover 3 are respectively provided with a vacuum extraction opening 13 and a pressure gauge 14.
In this embodiment, a driving motor 8 is installed in the base 1, and an output end of the driving motor is vertically connected with the center of the turntable 7.
In this embodiment, the tray 9 is made of a magnetic material, which magnetically attracts the nd-fe-b substrate.
In this embodiment, a layer of rubber sealing layer 12 is adhered to the inner wall of the sleeve 2, ear plates 15 are symmetrically arranged on two sides of the diffusion treatment cover 3, mounting plates 16 are symmetrically arranged on two sides of the base 1 under the two ear plates 15, a hydraulic telescopic rod 17 is respectively mounted on the two mounting plates 16, and output ends of the two hydraulic telescopic rods 17 are respectively and fixedly connected with the corresponding ear plates 15.
In this embodiment, the bottom surface of the tray 9 is provided with a plurality of positioning blocks 11 with a convex structure, and the top surface of the turntable 7 is correspondingly provided with positioning grooves in which the positioning blocks 11 are embedded.
In this embodiment, a control panel is mounted on the base 1, and the control panel is respectively connected with the electric heating tube 5, the driving motor 8, and the control end of the hydraulic telescopic rod 17.
Working principle: during diffusion treatment, all the electrical equipment is connected to an external power supply.
In the initial state, the diffusion treatment cover 3 is lifted and arranged above the sleeve 2, and the rotary disk 7 is in an exposed state; firstly, mounting a tray 9 on a turntable 7, embedding a positioning block 11 at the bottom of the tray into a positioning groove of the tray 7, and then vertically placing the processed neodymium-iron-boron magnet along an annular positioning groove 10 of the tray 9 to form a plurality of rings distributed inside and outside; starting a hydraulic telescopic rod 17, downwards moving the diffusion treatment cover 3 into the sleeve 2 to form a sealing structure, and covering each layer of electric heating pipes 5 just outside each annularly distributed neodymium-iron-boron magnet to form an enclosing structure; vacuumizing the inside of the diffusion treatment cover 3 through a vacuum extraction opening 13 by utilizing a vacuum pump, and observing the vacuum degree in the inside of the diffusion treatment cover through a pressure gauge 14; after the vacuum state is formed in the diffusion treatment cover 3, the power supply of the electric heating pipe 5 is turned on to heat, and meanwhile, the driving motor 8 is started to drive the tray 9 to rotate, so that the surface of the magnet is uniformly heated.
After the heat treatment is finished, the hydraulic telescopic rod 17 is started, the diffusion treatment cover 3 is lifted to the initial position, the tray 9 is taken down, and batch treatment of the NdFeB magnets is facilitated.
Notably, are: the whole device controls the realization of the device through the control buttons on the control panel, and because the equipment matched with the control buttons is common equipment, the device belongs to the prior art, and the electrical connection relation and the specific circuit structure of the device are not repeated here.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. The surface treatment method for improving the coercive force of the NdFeB substrate is characterized by comprising the following specific steps of:
s1: oil removal, acid washing and activation treatment are carried out on the sintered NdFeB magnet base material;
s2: forming an aluminum bottom film on the surface of the processed neodymium-iron-boron magnet by using an ion sputtering instrument, and then heating and evaporating alloy under a vacuum condition by using a vacuum evaporation device to form a vacuum aluminized layer arranged on the surface of the neodymium-iron-boron magnet;
S3: placing Tb 0.27Dy0.73Fe2 alloy powder into the solution, and fully stirring to form a mixed solution;
s4: coating the mixed solution on the surface of a neodymium-iron-boron magnet, and performing diffusion treatment on the neodymium-iron-boron magnet by using a thermal diffusion treatment device;
s5: putting the magnet subjected to diffusion treatment into ultrasonic equipment for ultrasonic treatment, and then drying to finish the surface treatment of the neodymium-iron-boron base material;
In the step S3, the solution is ethanol, span-60, tetraethoxysilane and a silane coupling agent KH560 according to the proportion of 100-110:1.1-1.2: mixed solution prepared by mixing 6-7:30-35;
In the step S3, the proportion of the Tb 0.27Dy0.73Fe2 alloy powder to the solution is 0.9-1.1:1, a step of;
The thermal diffusion treatment device comprises a base (1), wherein the periphery of the top of the base extends upwards to form a sleeve (2), an diffusion treatment cover (3) is embedded in the sleeve (2) in an adaptive manner, the sleeve is of a cylindrical structure with a closed top surface and an open bottom surface, a heating seat (4) is arranged at the top of the diffusion treatment cover (3), and an electric heating pipe (5) arranged on the heating seat (4) is arranged in the diffusion treatment cover (3); the electric heating pipes (5) are surrounded to form a cylindrical structure, a plurality of layers are arranged at intervals from inside to outside, and an diffusion interlayer cavity (6) is formed between two adjacent layers of electric heating pipes (5); the bottom of the sleeve (2) is provided with a turntable (7), a tray (9) is arranged on the turntable, positioning grooves (10) with annular inward sinking structures are arranged on the tray (9) corresponding to the positions of the diffusion interlayer cavities (6), and neodymium iron boron substrates which are processed in the step S5 and distributed annularly are placed in the positioning grooves (10); two sides of the diffusion treatment cover (3) are respectively provided with a vacuum extraction opening (13) and a pressure gauge (14);
a driving motor (8) is arranged in the base (1), and the output end of the driving motor is upwards and vertically connected with the center of the turntable (7);
The tray (9) is made of a magnetic material and is magnetically attracted with the NdFeB base material;
A rubber sealing layer (12) is adhered to the inner wall of the sleeve (2), ear plates (15) are symmetrically arranged on two sides of the diffusion treatment cover (3), mounting plates (16) are symmetrically arranged on two sides of the base (1) under the two ear plates (15), a hydraulic telescopic rod (17) is respectively arranged on the two mounting plates (16), and the output ends of the two hydraulic telescopic rods (17) are respectively fixedly connected with the corresponding ear plates (15) upwards;
The bottom surface of the tray (9) is provided with a plurality of positioning blocks (11) with raised structures, and the top surface of the turntable (7) is correspondingly provided with positioning grooves in which the positioning blocks (11) are embedded;
The base (1) is provided with a control panel which is respectively connected with the control ends of the electric heating pipe (5), the driving motor (8) and the hydraulic telescopic rod (17).
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