CN117275928A - Grain boundary diffusion method for repeated weight increment and repeated diffusion - Google Patents
Grain boundary diffusion method for repeated weight increment and repeated diffusion Download PDFInfo
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- 238000009792 diffusion process Methods 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005324 grain boundary diffusion Methods 0.000 title claims abstract description 20
- 238000000576 coating method Methods 0.000 claims abstract description 103
- 239000011248 coating agent Substances 0.000 claims abstract description 97
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 28
- 229910001172 neodymium magnet Inorganic materials 0.000 claims abstract description 20
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims description 77
- 239000007888 film coating Substances 0.000 claims description 13
- 238000009501 film coating Methods 0.000 claims description 13
- 229910052771 Terbium Inorganic materials 0.000 claims description 11
- GZCRRIHWUXGPOV-UHFFFAOYSA-N terbium atom Chemical compound [Tb] GZCRRIHWUXGPOV-UHFFFAOYSA-N 0.000 claims description 11
- 230000004584 weight gain Effects 0.000 claims description 9
- 235000019786 weight gain Nutrition 0.000 claims description 9
- 229910052772 Samarium Inorganic materials 0.000 claims description 8
- 238000005240 physical vapour deposition Methods 0.000 claims description 8
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 claims description 8
- 238000007650 screen-printing Methods 0.000 claims description 5
- 238000001771 vacuum deposition Methods 0.000 claims description 5
- -1 firstly Substances 0.000 claims description 2
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 abstract description 8
- 238000004140 cleaning Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000006698 induction Effects 0.000 abstract description 2
- 239000012466 permeate Substances 0.000 abstract description 2
- 238000003754 machining Methods 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 239000000047 product Substances 0.000 description 23
- 238000005496 tempering Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- 238000001755 magnetron sputter deposition Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
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- 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
- H01F41/0293—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 diffusion of rare earth elements, e.g. Tb, Dy or Ho, into permanent magnets
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- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Hard Magnetic Materials (AREA)
Abstract
The invention relates to the field of grain boundary diffusion, in particular to a grain boundary diffusion method for multiple weight increment and multiple diffusion. The manufacturing method comprises the following steps of feeding raw materials to produce a neodymium iron boron blank, machining the blank into a black sheet with a certain size and shape, and cleaning the surface of the black sheet; under the condition that the total weight of heavy rare earth in a diffusion source material is unchanged, the coercive force and the residual magnetic induction intensity of a magnet are improved more, the utilization efficiency of heavy rare earth resources is improved, rare earth elements in a diffusion source can better permeate into the material and form an ideal microstructure, the magnetic performance of a neodymium-iron-boron magnet is enhanced after the diffusion of the coating, and even though the neodymium-iron-boron magnet has larger thickness, the neodymium-iron-boron magnet still has better magnet consistency after the coating.
Description
Technical Field
The invention relates to the field of grain boundary diffusion, in particular to a grain boundary diffusion method for multiple weight increment and multiple diffusion.
Background
At present, the development of neodymium iron boron grain boundary diffusion is rapid, the grain boundary diffusion mode mainly comprises PVD (vapor plating, magnetron sputtering, multi-arc ion plating, single or combination) and coating (painting, spraying, dip coating, screen printing), the PVD mode has the advantages of good film binding force and the like, but the insufficient diffusion depth (generally within 10 mm) is always a great disadvantage of the technical method, and the grain boundary diffusion method is limited to be used in a plurality of application fields.
The PVD method is a current method for independently coating or independently coating, is generally suitable for products with the thickness of 6-8mm, has large internal and external differences after diffusion for products with the thickness of more than 10mm, and has poor magnet consistency.
Disclosure of Invention
The invention discloses a grain boundary diffusion method for multiple weight increment and multiple diffusion, which aims to solve the problems in the prior art.
In order to solve the technical problems, the invention adopts a technical scheme that: a grain boundary diffusion method for multiple weight increment and multiple diffusion comprises the following steps:
s1: the NdFeB material is fed and processed into a blank, the surface of the blank is processed into a black sheet state, and the surface of the black sheet is cleaned after the black sheet is processed into a certain specification;
s2: placing the black sheet into a coating machine for coating, firstly, coating the upper surface of the black sheet for the first time, turning over the black sheet after a certain value is added to the weight of the black sheet, coating the lower surface of the black sheet and a certain value is added to the weight of the black sheet, and performing heat treatment for diffusion for a certain time;
s3, coating the upper surface of the black sheet for the second time after the diffusion source is replaced, turning over the black sheet after the weight of the black sheet is increased by a certain value, coating the lower surface of the black sheet, and performing heat treatment for the second time after the weight of the black sheet is increased by a certain value;
s4: after the second heat treatment is finished, replacing the diffusion source with the diffusion source of the first film coating, repeating the operations of S2 and S3 on the upper surface and the lower surface of the black sheet for the third film coating, and carrying out heat treatment diffusion again for a certain time;
s5: and standing the black sheet subjected to three times of coating and heat treatment diffusion, and completely condensing a surface diffusion source on the surface of the black sheet to obtain a finished product.
Preferably, the blank is processed into a black sheet after production, with Br greater than 14.4KGs and Hcj greater than 14KOE.
Preferably, the weight of the first coating on the upper surface of the black sheet is increased by 0.2%, the weight of the second coating on the upper surface of the black sheet is increased by 0.1%, and the weight of the third coating on the upper surface of the black sheet is increased by 0.2%.
Preferably, the weight of the first coating on the lower surface of the black sheet is increased by 0.2%, the weight of the second coating on the lower surface of the black sheet is increased by 0.1%, and the weight of the third coating on the lower surface of the black sheet is increased by 0.2%.
Preferably, the first coating is a rotary target for a PVD device of a vacuum coating machine, or a coating or screen printing coating method, the second coating is a coating method using a rotary target for a PVD device of a vacuum coating machine, and the third coating is a rotary target for a PVD device of a vacuum coating machine, or a coating or screen printing coating method.
Preferably, the first heat treatment diffusion, the second heat treatment diffusion and the third heat treatment diffusion are all heated to 890-930 ℃, and the heating time of the first heat treatment diffusion, the second heat treatment diffusion and the third heat treatment diffusion is 8-12h in total.
Preferably, the diffusion sources of the first coating on the upper surface and the lower surface of the black sheet are heavy rare earth terbium, the total weight is increased by 0.4%, and the heat treatment is carried out for 3.2-4 hours.
Preferably, the diffusion sources of the second coating on the upper surface and the lower surface of the black sheet are light rare earth elements samarium, the total weight is increased by 0.2%, and the heat treatment is carried out for 1.6-2 hours.
The diffusion source is light rare earth element samarium, so that on one hand, the cost is reduced, and on the other hand, the diffusion capability of the black sheet is improved.
Preferably, the diffusion sources of the third coating on the upper surface and the lower surface of the black sheet are heavy rare earth terbium, the total weight is increased by 0.4%, and the heat treatment is carried out for 3.2-4 hours.
The invention has the beneficial effects that: under the condition that the total weight of heavy rare earth in a diffusion source material is unchanged, the coercive force and the residual magnetic induction intensity of a magnet are improved more, the utilization efficiency of heavy rare earth resources is improved, rare earth elements in a diffusion source can better permeate into the material and form an ideal microstructure, the magnetic performance of a neodymium-iron-boron magnet is enhanced after the diffusion of the coating, and even though the neodymium-iron-boron magnet has larger thickness, the neodymium-iron-boron magnet still has better magnet consistency after the coating.
Detailed Description
The invention provides a technical scheme that:
embodiment one: producing neodymium iron boron into blanks, processing the blanks into black sheets with the specification of 35x20x10mm after production, wherein the magnetic property of the blanks is Br more than 14.4KGs, hcj is more than 14KOe, placing the black sheets into a coating machine for coating after surface cleaning, firstly, coating the upper surfaces of the black sheets for the first time, wherein a diffusion source is terbium which is a heavy rare earth element, turning over the black sheets after the weight of the black sheets is increased by 0.2%, coating the lower surfaces of the black sheets and increasing the weight by 0.2%, performing first heat treatment diffusion, and heating to 920 ℃ for 4 hours; changing a diffusion source to make the diffusion source be light rare earth element samarium, coating the upper surface of the black sheet for the second time, turning over the black sheet after the weight of the black sheet is increased by 0.1%, coating the lower surface of the black sheet and increasing the weight by 0.1%, performing the second heat treatment diffusion, and heating to 920 ℃ for 2 hours; after the second heat treatment is finished, replacing the diffusion source with the diffusion source of the first film coating, repeating the operation on the upper surface and the lower surface of the black sheet for the third film coating, enabling the total weight of the black sheet to be increased by 0.4% after the film coating on the upper surface and the lower surface of the black sheet, performing heat treatment diffusion again, and heating to 920 ℃ for 4 hours; and standing the black sheet subjected to three times of coating and heat treatment diffusion, and performing a normal tempering process to ensure that a surface diffusion source of the black sheet is completely condensed on the surface of the black sheet to obtain a finished product, wherein the average magnetic property Br of the finished product is more than 14.25KGs, the Hcj is more than 24.5KOe, and the diffusion unilateral depth is 3.1mm.
Embodiment two: producing neodymium iron boron into a blank, processing the blank into a black sheet state with the specification of 35x20x10mm, wherein the magnetic property is Br more than 14.4KGs, hcj is more than 14KOe, placing the black sheet into a coating machine for coating after cleaning the surface of the black sheet, firstly, coating the upper surface of the black sheet for the first time, wherein a diffusion source is terbium which is a heavy rare earth element, turning over the black sheet after the weight of the black sheet is increased by 0.2%, coating the lower surface of the black sheet and increasing the weight by 0.2%, performing first heat treatment diffusion, and heating to 890 ℃ for 4 hours; changing a diffusion source to make the diffusion source be light rare earth element samarium, coating the upper surface of the black sheet for the second time, turning over the black sheet after the weight of the black sheet is increased by 0.1%, coating the lower surface of the black sheet and increasing the weight by 0.1%, performing the second heat treatment diffusion, and heating to 890 ℃ for 2 hours; after the second heat treatment is finished, replacing the diffusion source with the diffusion source of the first film coating, repeating the operation on the upper surface and the lower surface of the black sheet for the third film coating, enabling the total weight of the black sheet to be increased by 0.4% after the film coating on the upper surface and the lower surface of the black sheet, performing heat treatment diffusion again, and heating to 890 ℃ for 4 hours; and standing the black sheet subjected to three coating and heat treatment diffusion, and performing a normal tempering process to enable a surface diffusion source to be completely condensed on the surface of the black sheet to obtain a finished product, wherein the average magnetic property Br of the finished product is more than 14.3KGs, the Hcj is more than 23KOe, and the diffusion unilateral diameter is 2.9mm.
Embodiment III: producing neodymium iron boron into a blank, processing the blank into a black sheet state with the specification of 35x20x10mm, wherein the magnetic property is Br more than 14.4KGs, hcj is more than 14KOe, placing the black sheet into a coating machine for coating after cleaning the surface of the black sheet, firstly, coating the upper surface of the black sheet for the first time, wherein a diffusion source is terbium which is a heavy rare earth element, turning over the black sheet after the weight of the black sheet is increased by 0.2%, coating the lower surface of the black sheet and increasing the weight by 0.2%, performing first heat treatment diffusion, and heating to 920 ℃ for 6 hours; changing a diffusion source to make the diffusion source be light rare earth element samarium, coating the upper surface of the black sheet for the second time, turning over the black sheet after the weight of the black sheet is increased by 0.1%, coating the lower surface of the black sheet and increasing the weight by 0.1%, performing the second heat treatment diffusion, and heating to 920 ℃ for 6 hours; after the second heat treatment is finished, replacing the diffusion source with the diffusion source of the first film coating, repeating the operation on the upper surface and the lower surface of the black sheet for the third film coating, enabling the total weight of the black sheet to be increased by 0.4% after the film coating on the upper surface and the lower surface of the black sheet, performing heat treatment diffusion again, and heating to 920 ℃ for 6 hours; and standing the black sheet subjected to three times of coating and heat treatment diffusion, and performing a normal tempering process to ensure that a surface diffusion source of the black sheet is completely condensed on the surface of the black sheet to obtain a finished product, wherein the average magnetic property Br of the finished product is more than 14.15KGs, the Hcj is more than 25.5KOe, and the diffusion unilateral diameter is 3.4mm.
Comparative example one: producing neodymium iron boron into blanks, processing the blanks into black sheets with the specification of 35x20x10mm after the blanks are produced, wherein the magnetic property is Br which is more than 14.4KGs, hcj is more than 14KOe, placing the black sheets into a coating machine for coating after the surfaces of the black sheets are cleaned, firstly, coating the upper surfaces of the black sheets with a heavy rare earth element terbium for the first time, coating the upper surfaces and the lower surfaces of the black sheets with a heavy rare earth element terbium for the third time after the weight of the black sheets is increased by 0.2%, coating the lower surfaces of the black sheets with a light rare earth element samarium for the second time after the weight of the black sheets is increased by 0.1%, coating the lower surfaces of the black sheets with a film which is increased by 0.1%, and repeating the operations of coating the upper surfaces and the lower surfaces of the black sheets for the third time, wherein the total weight of the black sheets is increased by 0.4%, and the weight of the black sheets is increased by 0.890 ℃ for the second time, or heating the black sheets to 10h; and standing the black sheet subjected to three coating and heat treatment diffusion, and performing normal tempering to obtain a finished product, wherein the average magnetic property of the finished product is measured to be Br more than 14.27KGs, hcj is measured to be Hcj more than 20.5KOe, and the diffusion depth is 2mm on one side.
Comparative example two: producing neodymium iron boron into a blank, processing the blank into a black sheet state with the specification of 35x20x10mm, wherein the magnetic property is Br more than 14.4KGs, hcj is more than 14KOe, placing the black sheet into a coating machine for coating after cleaning the surface of the black sheet, firstly, coating the upper surface of the black sheet for the first time, wherein a diffusion source is terbium which is a heavy rare earth element, turning over the black sheet after the weight of the black sheet is increased by 0.2%, coating the lower surface of the black sheet and increasing the weight by 0.2%, performing first heat treatment diffusion, and heating to 920 ℃ for 5 hours; coating the upper surface of the black sheet for the second time, wherein the diffusion source is light rare earth element samarium, turning over the black sheet after the weight of the black sheet is increased by 0.2%, coating the lower surface of the black sheet and increasing the weight by 0.2%, performing heat treatment diffusion for the second time, and heating to 920 ℃ for 5 hours; after the second heat treatment is completed, a normal tempering process is carried out, so that the surface diffusion source is completely condensed on the surface of the black sheet to obtain a finished product, and the average magnetic property Br of the finished product is more than 14.2KGs, the Hcj is more than 19.5KOe, and the diffusion unilateral depth is 3.5mm.
Comparative example three: the manufacturing method comprises the steps of manufacturing a blank from neodymium iron boron, manufacturing the blank into a black sheet with the specification of 35x20x10mm, enabling the black sheet to be a temperature-resistant series magnet, enabling the magnetic property of the black sheet to be larger than 14.4KGs, enabling Hcj to be larger than 14KOe, placing the black sheet into a coating machine for coating after surface cleaning, firstly coating the upper surface of the black sheet, enabling a diffusion source to be heavy rare earth terbium, enabling the black sheet to be turned over after the weight of the black sheet is increased by 0.4%, enabling the lower surface of the black sheet to be coated and the weight of the black sheet to be increased by 0.4%, conducting heat treatment diffusion, heating to 920 ℃ for 10 hours, conducting normal tempering, enabling the surface diffusion source of the black sheet to be completely condensed on the surface of the black sheet, and obtaining a finished product, enabling the average magnetic property of the Br of the finished product to be larger than 14.15KGs, enabling the Hcj to be larger than 17.9KOe, and enabling the diffusion depth to be 2.3mm.
In summary, according to the first embodiment and the second embodiment, when coating heavy rare earth elements and multiple diffusion sources, the coating times and the heat treatment time are completely consistent, and compared with the finished product with the heat treatment temperature of 890 ℃, the finished product with the heat treatment temperature of 920 ℃ has lower remanence Br, but has higher intrinsic coercivity Hcj and diffusion unilateral depth;
and comparing with the first comparative example, the finished product of three times of coating and heat treatment is obtained on the premise that the total coating material amount, the total heat treatment time and the heat treatment temperature are consistent, and the intrinsic coercivity Hcj and the diffusion unilateral depth of the finished product are always higher than those of the finished product of one time of coating and heat treatment;
according to the first embodiment and the third embodiment, it can be seen that, on the premise that the total amount of the coating material, the heat treatment temperature, the number of times of coating and the number of times of heat treatment are consistent, the longer the total heat treatment time is, the smaller the drop amplitude of the remanence Br is, the larger the weight gain amplitude of the intrinsic coercivity Hcj is, and the single-side diffusion depth is also higher;
as can be seen from the third comparison example and the second comparison example, when a single heavy rare earth diffusion source is coated, on the premise that the total amount of the coated film, the heat treatment temperature and the total heat treatment time are consistent, the residual magnetic strength Br, the intrinsic coercivity Hcj and the diffusion unilateral depth of the finished product which is coated and heat treated twice are all higher than those of the finished product which is coated and heat treated once;
in summary, when coating a film on a neodymium-iron-boron magnet, heavy rare earth elements are diffused to the surface of the neodymium-iron-boron magnet for multiple times, and after each diffusion is completed, the neodymium-iron-boron magnet is subjected to one-time heat treatment, so that the heat treatment times of the neodymium-iron-boron magnet are the same as the coating times, and the performance of a finished product can be better improved.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the invention (including the claims) is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the invention, the steps may be implemented in any order and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
The present invention is intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. of the present invention should be included in the scope of the present invention.
Claims (9)
1. A grain boundary diffusion method for multiple weight increment and multiple diffusion is characterized in that: the method comprises the following steps:
s1: the NdFeB material is fed and processed into a blank, the surface of the blank is processed into a black sheet state, and the surface of the black sheet is cleaned after the black sheet is processed into a certain specification;
s2: placing the black sheet into a coating machine for coating, firstly, coating the upper surface of the black sheet for the first time, turning over the black sheet after a certain value is added to the weight of the black sheet, coating the lower surface of the black sheet and a certain value is added to the weight of the black sheet, and performing heat treatment for diffusion for a certain time;
s3, coating the upper surface of the black sheet for the second time after the diffusion source is replaced, turning over the black sheet after the weight of the black sheet is increased by a certain value, coating the lower surface of the black sheet, and performing heat treatment for the second time after the weight of the black sheet is increased by a certain value;
s4: after the second heat treatment is finished, replacing the diffusion source with the diffusion source of the first film coating, repeating the operations of S2 and S3 on the upper surface and the lower surface of the black sheet for the third film coating, and carrying out heat treatment diffusion again for a certain time;
s5: and standing the black sheet subjected to three times of coating and heat treatment diffusion, and completely condensing a surface diffusion source on the surface of the black sheet to obtain a finished product.
2. The multiple weight gain multiple diffusion grain boundary diffusion method according to claim 1, wherein: after the blank is produced, the blank is processed into a black sheet state, wherein Br is more than 14.4KGs, and Hcj is more than 14KOE.
3. The multiple weight gain multiple diffusion grain boundary diffusion method according to claim 1, wherein: the weight of the first coating on the upper surface of the black sheet is increased by 0.2%, the weight of the second coating on the upper surface of the black sheet is increased by 0.1%, and the weight of the third coating on the upper surface of the black sheet is increased by 0.2%.
4. The multiple weight gain multiple diffusion grain boundary diffusion method according to claim 1, wherein: the weight of the first coating on the lower surface of the black sheet is increased by 0.2%, the weight of the second coating on the lower surface of the black sheet is increased by 0.1%, and the weight of the third coating on the lower surface of the black sheet is increased by 0.2%.
5. The multiple weight gain multiple diffusion grain boundary diffusion method according to claim 1, wherein: the first coating is a rotary target for a PVD device of a vacuum coating machine, or a coating or screen printing coating method, the second coating is a coating method for coating by using the rotary target for the PVD device of the vacuum coating machine, and the third coating is a coating method for coating or screen printing.
6. The multiple weight gain multiple diffusion grain boundary diffusion method according to claim 1, wherein: the first heat treatment diffusion, the second heat treatment diffusion and the third heat treatment diffusion are heated to 890-930 ℃, and the heating time of the first heat treatment diffusion, the second heat treatment diffusion and the third heat treatment diffusion is 8-12h.
7. The multiple weight gain multiple diffusion grain boundary diffusion method according to claim 1, wherein: the diffusion sources of the first coating on the upper surface and the lower surface of the black sheet are heavy rare earth terbium, the total weight is increased by 0.4%, and the heat treatment is carried out for 3.2-4 hours.
8. The multiple weight gain multiple diffusion grain boundary diffusion method according to claim 1, wherein: the diffusion sources of the second coating on the upper surface and the lower surface of the black sheet are light rare earth elements samarium, the total weight is increased by 0.2%, and the heat treatment is carried out for 1.6-2 hours.
9. The multiple weight gain multiple diffusion grain boundary diffusion method according to claim 1, wherein: and the diffusion sources of the third coating on the upper and lower surfaces of the black sheet are heavy rare earth terbium, the total weight is increased by 0.4%, and the heat treatment is carried out for 3.2-4 hours.
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| CN114974776A (en) * | 2022-05-31 | 2022-08-30 | 烟台东星磁性材料股份有限公司 | Neodymium-iron-boron rare earth magnet and preparation method thereof |
| CN115172034A (en) * | 2022-06-28 | 2022-10-11 | 山西师范大学 | Step-by-step grain boundary diffusion process for high-performance sintered neodymium-iron-boron magnet |
| US20230070437A1 (en) * | 2021-08-27 | 2023-03-09 | Hangzhou Magmax Technology Co., Ltd. | Preparation method of neodymium iron boron products and neodymium iron boron product prepared by using the same |
| US20230207165A1 (en) * | 2020-05-27 | 2023-06-29 | Yantai Zhenghai Magnetic Material Co., Ltd. | Neodymium-iron-boron magnet, preparation method and use thereof |
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- 2023-11-23 CN CN202311566831.0A patent/CN117275928A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230207165A1 (en) * | 2020-05-27 | 2023-06-29 | Yantai Zhenghai Magnetic Material Co., Ltd. | Neodymium-iron-boron magnet, preparation method and use thereof |
| US20230070437A1 (en) * | 2021-08-27 | 2023-03-09 | Hangzhou Magmax Technology Co., Ltd. | Preparation method of neodymium iron boron products and neodymium iron boron product prepared by using the same |
| CN114974776A (en) * | 2022-05-31 | 2022-08-30 | 烟台东星磁性材料股份有限公司 | Neodymium-iron-boron rare earth magnet and preparation method thereof |
| CN115172034A (en) * | 2022-06-28 | 2022-10-11 | 山西师范大学 | Step-by-step grain boundary diffusion process for high-performance sintered neodymium-iron-boron magnet |
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