CN116675543A - Method for improving radial shrinkage of permanent ferrite magnet - Google Patents
Method for improving radial shrinkage of permanent ferrite magnet Download PDFInfo
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- CN116675543A CN116675543A CN202310567248.5A CN202310567248A CN116675543A CN 116675543 A CN116675543 A CN 116675543A CN 202310567248 A CN202310567248 A CN 202310567248A CN 116675543 A CN116675543 A CN 116675543A
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- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000000498 ball milling Methods 0.000 claims abstract description 121
- 239000000463 material Substances 0.000 claims abstract description 105
- 239000002994 raw material Substances 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229910001868 water Inorganic materials 0.000 claims abstract description 37
- 238000005245 sintering Methods 0.000 claims abstract description 21
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 32
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 32
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 claims description 32
- 238000005498 polishing Methods 0.000 claims description 20
- 239000004006 olive oil Substances 0.000 claims description 18
- 235000008390 olive oil Nutrition 0.000 claims description 18
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 16
- 239000000377 silicon dioxide Substances 0.000 claims description 16
- 235000012239 silicon dioxide Nutrition 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 8
- 239000008188 pellet Substances 0.000 claims 1
- 238000007493 shaping process Methods 0.000 claims 1
- 230000008602 contraction Effects 0.000 abstract description 4
- 239000011805 ball Substances 0.000 description 55
- 239000000654 additive Substances 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/6261—Milling
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- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3239—Vanadium oxides, vanadates or oxide forming salts thereof, e.g. magnesium vanadate
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- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
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Abstract
The invention relates to the technical field of permanent ferrite materials, in particular to a method for improving radial shrinkage of a permanent ferrite magnet; dividing a plurality of ball milling time periods and a continuous ball milling time period; dividing auxiliary materials into a plurality of equal parts according to the number of the ball milling time period; placing the presintered materials and balls into a ball mill for ball milling treatment, and respectively adding 1 part of auxiliary materials in each ball milling time period until the ball milling treatment of a plurality of ball milling time periods is completed, so as to obtain raw material balls; continuing ball milling treatment on the raw material balls in the continuous ball milling time period; adjusting the water content in the raw material balls, and forming in a magnetic field to obtain a material to be burned; sintering the material to be sintered to obtain a sintered material; the sintered product is polished to prepare the permanent magnetic ferrite, and finally the permanent magnetic ferrite has the characteristics of high comprehensive magnetic performance, small radial contraction, good orientation degree and high grain refinement, and the shrinkage efficiency of the radial contraction of the permanent magnetic ferrite magnet is improved through the mode.
Description
Technical Field
The invention relates to the technical field of permanent magnetic ferrite materials, in particular to a method for improving radial shrinkage of a permanent magnetic ferrite magnet.
Background
At present, in order to improve the radial shrinkage of a permanent ferrite magnet, olive oil is added into a presintered material and balls in the ball milling process of the permanent ferrite, the shrinkage ratio and the orientation degree of the magnet are changed by using the olive oil, and the blank shrinkage ratio is reduced, so that the radial shrinkage of the permanent ferrite magnet is improved; however, in the above mode, the pre-sintering material, the balls and the additives are directly ball-milled, so that the shrinkage efficiency of radial shrinkage of the permanent magnetic ferrite magnet is low.
Disclosure of Invention
The invention aims to provide a method for improving radial shrinkage of a permanent magnetic ferrite magnet, and aims to solve the technical problem of low shrinkage efficiency of radial shrinkage of the permanent magnetic ferrite magnet in the prior art.
In order to achieve the above object, the method for improving radial shrinkage of a permanent ferrite magnet according to the present invention comprises the following steps:
dividing a plurality of ball milling time periods and a continuous ball milling time period;
dividing auxiliary materials into a plurality of equal parts according to the number of the ball milling time period;
placing the presintered materials and balls into a ball mill for ball milling treatment, and respectively adding 1 part of auxiliary materials in each ball milling time period until the ball milling treatment of a plurality of ball milling time periods is completed, so as to obtain raw material balls;
continuing ball milling treatment on the raw material balls in the continuous ball milling time period;
adjusting the water content in the raw material balls, and forming in a magnetic field to obtain a material to be burned;
sintering the material to be sintered to obtain a sintered material;
and polishing the sintered product to obtain the permanent magnetic ferrite.
Wherein, in the step of dividing the plurality of ball milling time periods and the continuous ball milling time period:
each ball milling time period is 1-2 h, and the continuous ball milling time period is 9-13 h.
Wherein, in the step of dividing the auxiliary material into a plurality of equal parts according to the number of segments of the ball milling time period:
the auxiliary materials comprise water, calcium carbonate, silicon dioxide, vanadium pentoxide and olive oil.
Wherein, in the step of putting the presintered material and the balls into a ball mill for ball milling treatment, adding 1 part of auxiliary material into each ball milling time period until the ball milling treatment of a plurality of ball milling time periods is completed, and obtaining raw material balls:
the weight ratio of the presintered material, the balls, the water, the calcium carbonate, the silicon dioxide, the vanadium pentoxide and the olive oil is 1-3: 15-30: 1 to 3: 0.005-0.007: 0.001 to 0.003:0.003 to 0.005:0.001 to 0.003.
Wherein, in the step of continuing ball milling treatment of the raw material balls in the continuous ball milling time period:
and (5) finishing the addition of the auxiliary materials.
Wherein, in the steps of adjusting the water content in the raw material balls, forming in a magnetic field and preparing the material to be burned:
the water content in each auxiliary material is adjusted so as to adjust the water content in the raw material balls.
Wherein, in the step of sintering the material to be sintered to obtain a sintered material:
the sintering time is 2-4 h, and the sintering temperature is 1000-1200 ℃.
Wherein, before the step of polishing the sinter to prepare the permanent ferrite:
and cooling the sinter.
Wherein, after the step of polishing the sinter to prepare the permanent ferrite:
and polishing the sintered product according to the size requirement on the processing drawing to obtain the permanent magnetic ferrite, and storing after removing scraps on the surface of the permanent magnetic ferrite.
The invention relates to a method for improving radial shrinkage of a permanent ferrite magnet, which comprises the steps of dividing a plurality of ball milling time periods and continuous ball milling time periods; dividing auxiliary materials into a plurality of equal parts according to the number of the ball milling time period; placing the presintered materials and balls into a ball mill for ball milling treatment, and respectively adding 1 part of auxiliary materials in each ball milling time period until the ball milling treatment of a plurality of ball milling time periods is completed, so as to obtain raw material balls; continuing ball milling treatment on the raw material balls in the continuous ball milling time period; adjusting the water content in the raw material balls, and forming in a magnetic field to obtain a material to be burned; sintering the material to be sintered to obtain a sintered material; and polishing the sintered product to obtain the permanent magnetic ferrite, wherein the finally obtained permanent magnetic ferrite has the characteristics of high comprehensive magnetic property, small radial contraction, good orientation degree and high grain refinement, and the improvement of the radial contraction efficiency of the permanent magnetic ferrite magnet is realized.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of the steps of embodiment 1 of the present invention.
Fig. 2 is a flow chart of the steps of embodiment 2 of the present invention.
Fig. 3 is a flow chart of the steps of embodiment 3 of the present invention.
Detailed Description
Embodiment 1 referring to fig. 1, the present invention provides a method for improving radial shrinkage of a permanent ferrite magnet, comprising the steps of:
s11: dividing a plurality of ball milling time periods and continuous ball milling time periods, wherein each ball milling time period is 2 hours, and each continuous ball milling time period is 13 hours;
s12: dividing auxiliary materials into a plurality of equal parts according to the number of the ball milling time period, wherein the auxiliary materials comprise water, calcium carbonate, silicon dioxide, vanadium pentoxide and olive oil, and the weight ratio of the pre-sintered materials, balls, water, calcium carbonate, silicon dioxide, vanadium pentoxide and olive oil is 3:30:3:0.007:0.003:0.005:0.003;
s13: placing the presintered materials and balls into a ball mill for ball milling treatment, and respectively adding 1 part of auxiliary materials in each ball milling time period until the ball milling treatment of a plurality of ball milling time periods is completed, so as to obtain raw material balls;
s14: continuing ball milling treatment on the raw material balls in the continuous ball milling time period, and finishing the addition of the auxiliary materials;
s15: adjusting the water content in each auxiliary material, so as to adjust the water content in the raw material balls, and forming in a magnetic field to obtain a material to be burned;
s16: sintering the material to be sintered for 4 hours at 1200 ℃ to obtain a sintered material;
s17: cooling the sinter;
s18: polishing the sintered product to obtain permanent magnetic ferrite, polishing the sintered product according to the size requirement on a processing drawing to obtain permanent magnetic ferrite, removing scraps on the surface of the permanent magnetic ferrite, and storing.
In this embodiment, by first dividing a plurality of ball milling time periods each of which is 2 hours and a continuous ball milling time period of which is 13 hours, and then dividing the auxiliary material into a plurality of equal parts according to the number of the ball milling time periods, the auxiliary material includes water, calcium carbonate, silica, vanadium pentoxide and olive oil, wherein the weight ratio of the pre-sintered material, balls, water, calcium carbonate, silica, vanadium pentoxide and olive oil is 3:30:3:0.007:0.003:0.005:0.003, placing the presintered material and balls into a ball mill, performing ball milling treatment, respectively adding 1 part of auxiliary material in each ball milling time period until ball milling treatment of a plurality of ball milling time periods is completed to obtain raw material balls, continuously performing ball milling treatment on the raw material balls in the continuous ball milling time period, adjusting the water content in each auxiliary material in the ball milling process after the auxiliary material is added, adjusting the water content in the raw material balls, forming in a magnetic field to obtain a material to be sintered, sintering the material to be sintered for 4 hours, sintering at 1200 ℃ to obtain a sinter, cooling the sinter, polishing the sinter to obtain permanent magnetic ferrite according to the size requirement on a processing drawing, and storing after removing sweeps on the surface of the permanent magnetic ferrite.
Embodiment 2 referring to fig. 2, the present invention provides a method for improving radial shrinkage of a permanent ferrite magnet, comprising the steps of:
s21: dividing a plurality of ball milling time periods and a continuous ball milling time period, wherein each ball milling time period is 1.5 hours, and the continuous ball milling time period is 11 hours;
s22: dividing the auxiliary material into a plurality of equal parts according to the number of the ball milling time period, wherein the auxiliary material comprises water, calcium carbonate, silicon dioxide, vanadium pentoxide and olive oil, and the weight ratio of the pre-sintered material to the balls to the water to the calcium carbonate to the silicon dioxide to the vanadium pentoxide to the olive oil is 2:23:2:0.006:0.002:0.004:0.002;
s23: placing the presintered materials and balls into a ball mill for ball milling treatment, and respectively adding 1 part of auxiliary materials in each ball milling time period until the ball milling treatment of a plurality of ball milling time periods is completed, so as to obtain raw material balls;
s24: continuing ball milling treatment on the raw material balls in the continuous ball milling time period, and finishing the addition of the auxiliary materials;
s25: adjusting the water content in each auxiliary material, so as to adjust the water content in the raw material balls, and forming in a magnetic field to obtain a material to be burned;
s26: sintering the material to be sintered for 3 hours at 1100 ℃ to obtain a sintered material;
s27: cooling the sinter;
s28: polishing the sintered product to obtain permanent magnetic ferrite, polishing the sintered product according to the size requirement on a processing drawing to obtain permanent magnetic ferrite, removing scraps on the surface of the permanent magnetic ferrite, and storing.
In this embodiment, by first dividing a plurality of ball milling time periods, each of which is 1.5 hours, and a continuous ball milling time period, each of which is 11 hours, according to the number of the ball milling time periods, the auxiliary material is divided into a plurality of equal parts, the auxiliary material including water, calcium carbonate, silica, vanadium pentoxide and olive oil, wherein the weight ratio of the pre-sintered material, balls, water, calcium carbonate, silica, vanadium pentoxide and olive oil is 2:23:2:0.006:0.002:0.004:0.002, then placing the presintered material and balls into a ball mill for ball milling treatment, respectively adding 1 part of auxiliary material in each ball milling time period until ball milling treatment of a plurality of ball milling time periods is completed to obtain raw material balls, then continuing ball milling treatment of the raw material balls in the continuous ball milling time period, after the auxiliary material addition is completed, adjusting the water content in each auxiliary material in the ball milling process, adjusting the water content in the raw material balls, forming in a magnetic field to obtain a material to be sintered, then sintering the material to be sintered for 3 hours, wherein the sintering temperature is 1100 ℃, cooling the sinter, finally polishing the sinter to obtain permanent magnetic ferrite, polishing the sinter according to the size requirement on a processing drawing, and storing after removing scraps on the surface of the permanent magnetic ferrite, and finally obtaining the permanent magnetic ferrite which has the characteristics of high comprehensive magnetic property, good radial shrinkage, high orientation degree and high grain refinement, thereby realizing the improvement of the shrinkage efficiency of the radial shrinkage of the permanent magnetic ferrite.
Embodiment 3 referring to fig. 3, the present invention provides a method for improving radial shrinkage of a permanent ferrite magnet, comprising the steps of:
s31: dividing a plurality of ball milling time periods and continuous ball milling time periods, wherein each ball milling time period is 1h, and each continuous ball milling time period is 9h;
s32: dividing auxiliary materials into a plurality of equal parts according to the number of the ball milling time period, wherein the auxiliary materials comprise water, calcium carbonate, silicon dioxide, vanadium pentoxide and olive oil, and the weight ratio of the pre-sintered materials to the balls to the water to the calcium carbonate to the silicon dioxide to the vanadium pentoxide to the olive oil is 1:15:1:0.005:0.001:0.003:0.001;
s33: placing the presintered materials and balls into a ball mill for ball milling treatment, and respectively adding 1 part of auxiliary materials in each ball milling time period until the ball milling treatment of a plurality of ball milling time periods is completed, so as to obtain raw material balls;
s34: continuing ball milling treatment on the raw material balls in the continuous ball milling time period, and finishing the addition of the auxiliary materials;
s35: adjusting the water content in each auxiliary material, so as to adjust the water content in the raw material balls, and forming in a magnetic field to obtain a material to be burned;
s36: sintering the material to be sintered for 2 hours at the sintering temperature of 1000 ℃ to obtain a sintered material;
s37: cooling the sinter;
s38: polishing the sintered product to obtain permanent magnetic ferrite, polishing the sintered product according to the size requirement on a processing drawing to obtain permanent magnetic ferrite, removing scraps on the surface of the permanent magnetic ferrite, and storing.
In this embodiment, by first dividing a plurality of ball milling time periods, each of which is 1h, and a continuous ball milling time period, each of which is 9h, according to the number of the ball milling time periods, the auxiliary material is divided into a plurality of equal parts, the auxiliary material including water, calcium carbonate, silica, vanadium pentoxide, and olive oil, wherein the weight ratio of the pre-sintered material, balls, water, calcium carbonate, silica, vanadium pentoxide, and olive oil is 1:15:1:0.005:0.001:0.003:0.001, placing the presintered material and balls into a ball mill, performing ball milling treatment, respectively adding 1 part of auxiliary material in each ball milling time period until ball milling treatment of a plurality of ball milling time periods is completed to obtain raw material balls, continuously performing ball milling treatment on the raw material balls in the continuous ball milling time period, after the auxiliary material is added, adjusting the water content in each auxiliary material, adjusting the water content in the raw material balls, forming in a magnetic field to obtain a material to be sintered, sintering the material to be sintered for 2 hours at a sintering temperature of 1000 ℃, obtaining a sinter, cooling the sinter, polishing the sinter to obtain permanent magnetic ferrite, polishing the sinter according to the size requirement on a processing drawing, and storing after removing scraps on the surface of the permanent magnetic ferrite, wherein the obtained permanent magnetic ferrite has the characteristics of high comprehensive magnetic property, small radial shrinkage, good orientation degree and high grain refinement, and realizes the improvement of the shrinkage efficiency of the radial shrinkage of the permanent magnetic ferrite.
The above disclosure is only a preferred embodiment of the present invention, and it should be understood that the scope of the invention is not limited thereto, and those skilled in the art will appreciate that all or part of the procedures described above can be performed according to the equivalent changes of the claims, and still fall within the scope of the present invention.
Claims (9)
1. A method of improving radial shrinkage of a permanent ferrite magnet, comprising the steps of:
dividing a plurality of ball milling time periods and a continuous ball milling time period;
dividing auxiliary materials into a plurality of equal parts according to the number of the ball milling time period;
placing the presintered materials and balls into a ball mill for ball milling treatment, and respectively adding 1 part of auxiliary materials in each ball milling time period until the ball milling treatment of a plurality of ball milling time periods is completed, so as to obtain raw material balls;
continuing ball milling treatment on the raw material balls in the continuous ball milling time period;
adjusting the water content in the raw material balls, and forming in a magnetic field to obtain a material to be burned;
sintering the material to be sintered to obtain a sintered material;
and polishing the sintered product to obtain the permanent magnetic ferrite.
2. The method for improving radial shrinkage of a permanent magnet ferrite magnet according to claim 1, wherein in the step of dividing the plurality of ball milling time periods and the continuous ball milling time period:
each ball milling time period is 1-2 h, and the continuous ball milling time period is 9-13 h.
3. The method for improving radial shrinkage of a permanent magnet ferrite magnet according to claim 1, wherein in the step of dividing the auxiliary material into a plurality of equal parts according to the number of segments of the ball milling period:
the auxiliary materials comprise water, calcium carbonate, silicon dioxide, vanadium pentoxide and olive oil.
4. A method for improving radial shrinkage of a permanent magnet ferrite magnet according to claim 3, wherein, in the step of putting the presintered material and the balls into a ball mill, performing ball milling treatment, 1 part of auxiliary material is added in each ball milling period until the ball milling treatment for a plurality of ball milling periods is completed, to obtain raw material balls:
the weight ratio of the presintered material, the balls, the water, the calcium carbonate, the silicon dioxide, the vanadium pentoxide and the olive oil is 1-3: 15-30: 1 to 3: 0.005-0.007: 0.001 to 0.003:0.003 to 0.005:0.001 to 0.003.
5. The method for improving radial shrinkage of a permanent magnet ferrite magnet according to claim 1, wherein in the step of continuing the ball milling process of the raw material balls for a continuous ball milling period:
and (5) finishing the addition of the auxiliary materials.
6. A method for improving radial shrinkage of a permanent magnet ferrite magnet as defined in claim 2, wherein in the step of adjusting the moisture content of the raw material pellets and shaping in a magnetic field to produce the material to be fired:
the water content in each auxiliary material is adjusted so as to adjust the water content in the raw material balls.
7. The method for improving radial shrinkage of a permanent magnet ferrite magnet according to claim 1, wherein in the step of sintering the material to be sintered to obtain a sintered material:
the sintering time is 2-4 h, and the sintering temperature is 1000-1200 ℃.
8. The method for improving radial shrinkage of a permanent magnet ferrite magnet according to claim 1, wherein, before the step of polishing the sinter to produce the permanent ferrite:
and cooling the sinter.
9. The method for improving radial shrinkage of a permanent magnet ferrite magnet according to claim 1, wherein after the step of polishing the sintered body to obtain the permanent ferrite:
and polishing the sintered product according to the size requirement on the processing drawing to obtain the permanent magnetic ferrite, and storing after removing scraps on the surface of the permanent magnetic ferrite.
Priority Applications (1)
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0831627A (en) * | 1994-05-13 | 1996-02-02 | Tdk Corp | Hexagonal ba ferrite sintered magnet, manufacture thereof, and polar anisotropic ring magnet |
| CN104692786A (en) * | 2015-03-18 | 2015-06-10 | 马鞍山市鑫洋永磁有限责任公司 | Low-radial shrinkage ratio permanent magnetic ferrite magnet and preparation method thereof |
| CN112645719A (en) * | 2020-12-29 | 2021-04-13 | 横店集团东磁股份有限公司 | Method for improving radial shrinkage of permanent magnetic ferrite magnet |
| CN112919896A (en) * | 2020-12-28 | 2021-06-08 | 横店集团东磁股份有限公司 | Preparation method of high-density permanent magnetic ferrite material |
| CN115010477A (en) * | 2022-05-10 | 2022-09-06 | 南京溧水金洪磁性元件有限公司 | Method and device for improving radial shrinkage of permanent magnetic ferrite magnet |
-
2023
- 2023-05-19 CN CN202310567248.5A patent/CN116675543A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0831627A (en) * | 1994-05-13 | 1996-02-02 | Tdk Corp | Hexagonal ba ferrite sintered magnet, manufacture thereof, and polar anisotropic ring magnet |
| CN104692786A (en) * | 2015-03-18 | 2015-06-10 | 马鞍山市鑫洋永磁有限责任公司 | Low-radial shrinkage ratio permanent magnetic ferrite magnet and preparation method thereof |
| CN112919896A (en) * | 2020-12-28 | 2021-06-08 | 横店集团东磁股份有限公司 | Preparation method of high-density permanent magnetic ferrite material |
| CN112645719A (en) * | 2020-12-29 | 2021-04-13 | 横店集团东磁股份有限公司 | Method for improving radial shrinkage of permanent magnetic ferrite magnet |
| CN115010477A (en) * | 2022-05-10 | 2022-09-06 | 南京溧水金洪磁性元件有限公司 | Method and device for improving radial shrinkage of permanent magnetic ferrite magnet |
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