CN113562769A - Dispersing agent and method for improving magnetic property of bonded permanent magnetic ferrite material - Google Patents
Dispersing agent and method for improving magnetic property of bonded permanent magnetic ferrite material Download PDFInfo
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- CN113562769A CN113562769A CN202110634054.3A CN202110634054A CN113562769A CN 113562769 A CN113562769 A CN 113562769A CN 202110634054 A CN202110634054 A CN 202110634054A CN 113562769 A CN113562769 A CN 113562769A
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- dispersing agent
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- bonded permanent
- magnetic ferrite
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- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 61
- 239000002270 dispersing agent Substances 0.000 title claims abstract description 51
- 239000000463 material Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000000227 grinding Methods 0.000 claims abstract description 49
- 229960004494 calcium gluconate Drugs 0.000 claims abstract description 18
- 235000013927 calcium gluconate Nutrition 0.000 claims abstract description 18
- 239000004227 calcium gluconate Substances 0.000 claims abstract description 18
- NEEHYRZPVYRGPP-UHFFFAOYSA-L calcium;2,3,4,5,6-pentahydroxyhexanoate Chemical compound [Ca+2].OCC(O)C(O)C(O)C(O)C([O-])=O.OCC(O)C(O)C(O)C(O)C([O-])=O NEEHYRZPVYRGPP-UHFFFAOYSA-L 0.000 claims abstract description 18
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims abstract description 14
- 239000002002 slurry Substances 0.000 claims abstract description 14
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims abstract description 14
- 239000002245 particle Substances 0.000 claims abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 9
- 238000000498 ball milling Methods 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 8
- 238000005496 tempering Methods 0.000 claims description 8
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 6
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 238000005245 sintering Methods 0.000 claims description 2
- 239000000243 solution Substances 0.000 abstract description 6
- 239000006185 dispersion Substances 0.000 abstract description 4
- 230000007062 hydrolysis Effects 0.000 abstract description 3
- 238000006460 hydrolysis reaction Methods 0.000 abstract description 3
- 239000006247 magnetic powder Substances 0.000 abstract description 3
- 230000009471 action Effects 0.000 abstract description 2
- 239000007864 aqueous solution Substances 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 abstract description 2
- 230000001737 promoting effect Effects 0.000 abstract description 2
- 238000005054 agglomeration Methods 0.000 abstract 1
- 230000002776 aggregation Effects 0.000 abstract 1
- 239000000696 magnetic material Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005662 electromechanics Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000005405 multipole Effects 0.000 description 1
- 239000011882 ultra-fine particle Substances 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/0018—Mixed oxides or hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
-
- 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
- H01F1/0302—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity characterised by unspecified or heterogeneous hardness or specially adapted for magnetic hardness transitions
- H01F1/0311—Compounds
- H01F1/0313—Oxidic compounds
- H01F1/0315—Ferrites
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/42—Magnetic properties
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Power Engineering (AREA)
- Food Science & Technology (AREA)
- Inorganic Chemistry (AREA)
- Magnetic Ceramics (AREA)
Abstract
The invention discloses a dispersant and a method for improving the magnetic property of a bonded permanent magnetic ferrite material, wherein the combined action of sodium polyacrylate and calcium gluconate is favorable for promoting the dispersion of ferrite particles and preventing the particle agglomeration, the aqueous solution of sodium polyacrylate is alkaline, the hydrolysis of the dispersant is prevented by adjusting the pH value of the solution, the Zeta potential between powders is improved, stronger electrostatic repulsion between particles can be obtained due to the improvement of the Zeta potential, the dispersion degree of magnetic powder particles is improved, the orientation degree of the permanent magnetic ferrite and the stability of slurry are improved, so that the aim of improving the magnetic property of the bonded permanent magnetic ferrite is fulfilled, the magnetic property of the bonded permanent magnetic ferrite prepared by the method is obviously improved, compared with the method of adding the combined dispersant in an alkaline grinding medium or adding the dispersant singly, can obviously improve the magnetic performance of the permanent magnetic ferrite.
Description
Technical Field
The invention relates to the technical field of industrial production, in particular to a dispersing agent and a method for improving the magnetic property of a bonded permanent magnetic ferrite material.
Background
The ferrite permanent magnetic material is a permanent magnetic material with the largest demand in the current industrial production, and is widely applied to the information and electromechanical industry, the permanent magnetic material can be divided into a bonded permanent magnetic ferrite and a sintered permanent magnetic ferrite according to different molding processes, and in the fields of electromechanics, sensors and the like, the sintered ferrite occupies most of the permanent magnetic ferrite market at present due to the characteristics of high magnetic performance, good temperature stability, low price and the like, but the ferrite permanent magnetic material also has the following characteristics: low size precision, low impact strength, difficult multi-pole magnetizing and the like. In contrast, the bonded permanent magnetic ferrite has the advantages of relatively simple molding process, easiness in manufacturing products with higher dimensional accuracy, smaller relative density and the like, and is increasingly applied to the fields of medical treatment, electronic appliances, instruments and the like in recent high and new technical fields, but the bonded permanent magnetic ferrite has relatively lower magnetic performance, and along with the production and application of high and new technical equipment, higher requirements are provided for the magnetic performance of the bonded permanent magnetic ferrite.
Therefore, we propose a dispersant and a method for improving the magnetic property of the bonded permanent magnetic ferrite material to solve the above problems.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a dispersing agent and a method for improving the magnetic property of a bonded permanent magnetic ferrite material.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for improving the magnetic property of a bonded permanent magnetic ferrite material by using a dispersing agent comprises the following steps:
s01: adding a dispersing agent into 1L of water, and uniformly stirring to ensure that the dispersing agent can be fully dissolved in the water to be used as a grinding medium, wherein the weight of calcium gluconate is 0.4 percent of that of the pre-sintered material ball, and the ratio of sodium polyacrylate to calcium gluconate is 3: 1;
s02: adding 0.6kg of material balls and grinding media into a ball milling tank in sequence for grinding;
s03: grinding the ball milling slurry in the step S2 to 1.15um in granularity;
s04: and (5) washing, tempering, drying and powdering the ferrite ball-milling slurry obtained in the step (S3) to obtain bonded permanent magnetic ferrite powder.
Preferably, the method further comprises the following steps:
s11: adding a dispersing agent into 1L of water, and uniformly stirring to ensure that the dispersing agent can be fully dissolved in the water to be used as a grinding medium, wherein the weight of calcium gluconate is 0.4 percent of that of the pre-sintered material ball, and the ratio of sodium polyacrylate to calcium gluconate is 3: 1;
s12: adjusting the pH value of the grinding medium by using ammonia water to enable the pH value to reach 9.5;
s13: adding 0.6kg of material balls and grinding media into a ball milling tank in sequence for grinding;
s14: grinding the ball milling slurry in the step S13 to 1.15um in granularity;
s15: and (5) washing, tempering, drying and powdering the ferrite ball-milling slurry obtained in the step (S14) to obtain bonded permanent magnetic ferrite powder.
Preferably, in the step S01, the mass ratio of the sodium polyacrylate to the calcium gluconate is 2-5: 1;
preferably, in step S02, the grinding medium: adding the dispersing agent into water, and stirring uniformly to enable the dispersing agent to be capable of fully dissolving in the water.
Preferably, the pH value of the grinding medium can be adjusted by ammonia water, so that the pH value of the solution is controlled to be 8-12;
preferably, in step S03, the bonded permanent magnetic ferrite pre-sintered balls and the grinding medium are added into a ball mill, and the ball mill is started to grind.
Preferably, the mass of the pre-sintering material balls is the following mass of grinding media: 0.5-0.75; the granularity is controlled to be 1.1-1.2 um;
preferably, the tempering temperature is controlled to be about 920 ℃.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the dispersing agent for improving the magnetic property of the bonded permanent magnetic ferrite material, sodium polyacrylate and calcium gluconate are selected as the dispersing agent, the pH value of a grinding medium is adjusted through ammonia water, the magnetic property of the bonded permanent magnetic ferrite is obviously improved, the magnetic property of a product is obviously improved, the common action of the sodium polyacrylate and the calcium gluconate is favorable for promoting the dispersion of ferrite particles and preventing the particles from agglomerating, and the hydrolysis of the dispersing agent is prevented and the Zeta potential between the powder particles is improved due to the fact that the aqueous solution of the sodium polyacrylate is alkaline and the pH value of the solution is adjusted.
2. The invention relates to a dispersing agent for improving the magnetic property of a bonded permanent magnetic ferrite material, which can obtain stronger electrostatic repulsion among particles due to the improvement of Zeta potential, improve the dispersion degree of magnetic powder particles, and improve the orientation degree of the permanent magnetic ferrite and the stability of slurry, thereby achieving the purpose of improving the magnetic property of the bonded permanent magnetic ferrite.
Drawings
FIG. 1 is a diagram of the method steps of a dispersant for improving the magnetic property of a bonded permanent magnetic ferrite material according to the present invention;
FIG. 2 is a diagram of another method for improving the magnetic property of the bonded permanent magnetic ferrite material.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1
Referring to fig. 1, a method of improving a dispersant for binding magnetic properties of a permanent magnetic ferrite material includes the steps of:
s01: adding a dispersing agent into 1L of water, and uniformly stirring to ensure that the dispersing agent can be fully dissolved in the water to be used as a grinding medium, wherein the weight of calcium gluconate is 0.4 percent of that of the pre-sintered material ball, and the ratio of sodium polyacrylate to calcium gluconate is 3: 1;
s02: adding 0.6kg of material balls and grinding media into a ball milling tank in sequence for grinding;
s03: grinding the ball milling slurry in the step S2 to 1.15um in granularity;
s04: and (4) washing the ferrite ball-milling slurry obtained in the step (S3), tempering (920 ℃), drying and powdering to obtain the bonded permanent magnetic ferrite powder.
The following table shows the process parameters and the magnetic performance test results of the permanent magnetic ferrite:
from the above table, when the PH value of the grinding medium is controlled to be 7.5, by adding the combined dispersing agents with different proportions, the magnetic performance of the permanent magnetic ferrite is better, the remanence reaches 168mT, and the intrinsic coercive force reaches 313kA/m compared with the case that only one dispersing agent is added or not added.
Example 2
Referring to fig. 2, a method of improving the magnetic property of the bonded permanent magnetic ferrite material further includes the following steps:
s11: adding a dispersing agent into 1L of water, and uniformly stirring to ensure that the dispersing agent can be fully dissolved in the water to be used as a grinding medium, wherein the weight of calcium gluconate is 0.4 percent of that of the pre-sintered material ball, and the ratio of sodium polyacrylate to calcium gluconate is 3: 1;
s12: adjusting the pH value of the grinding medium by using ammonia water to enable the pH value to reach 9.5;
s13: adding 0.6kg of material balls and grinding media into a ball milling tank in sequence for grinding;
s14: grinding the ball milling slurry in the step S13 to 1.15um in granularity;
s15: and (5) washing, tempering, drying and powdering the ferrite ball-milling slurry obtained in the step (S14) to obtain bonded permanent magnetic ferrite powder.
The following table shows the process parameters and the magnetic performance test results of the permanent magnetic ferrite:
from the above table, when the PH of the grinding medium is controlled to be 9.5, by adding the combined dispersing agents with different proportions, the magnetic performance of the permanent magnetic ferrite is better, the remanence reaches 173mT, and the intrinsic coercivity reaches 318kA/m compared with the case that only one dispersing agent is added or not added.
As can be seen from the results of comparing the tables of example 1 and example 2, the magnetic performance of the permanent magnetic ferrite is better by adding the dispersant in different proportions compared with the case of adding no dispersant or only one dispersant. And when the grinding medium solution is alkaline, the hydrolysis of the dispersing agent can be more inhibited, the Zeta potential of the powder inspection is improved, the solution viscosity is reduced, the fine grinding is promoted, and the proportion of the ultrafine particles in the magnetic powder is reduced, so that the bonded permanent magnetic ferrite has more excellent magnetic performance.
In summary, the combined dispersing agent sodium polyacrylate and the calcium gluconate are added, the mass ratio of the combined dispersing agent is controlled to be 2-5: 1, the pH value of the grinding medium is adjusted, and the pH value of the grinding medium is controlled to be 8-12. The dispersing agent and the method for improving the magnetic property of the bonded permanent magnetic ferrite material can effectively improve the magnetic property of the bonded permanent magnetic ferrite.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
In the description of the present invention, it is to be understood that the terms indicating an orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Claims (8)
1. A method for improving the magnetic property of a bonded permanent magnetic ferrite material is characterized by comprising the following steps: the method comprises the following steps:
s01: adding a dispersing agent into 1L of water, and uniformly stirring to ensure that the dispersing agent can be fully dissolved in the water to be used as a grinding medium, wherein the weight of calcium gluconate is 0.4 percent of that of the pre-sintered material ball, and the ratio of sodium polyacrylate to calcium gluconate is 3: 1;
s02: adding 0.6kg of material balls and grinding media into a ball milling tank in sequence for grinding;
s03: grinding the ball milling slurry in the step S2 to 1.15um in granularity;
s04: and (5) washing, tempering, drying and powdering the ferrite ball-milling slurry obtained in the step (S3) to obtain bonded permanent magnetic ferrite powder.
2. A method for improving the magnetic property of a bonded permanent magnetic ferrite material is characterized by comprising the following steps: further comprising the steps of:
s11: adding a dispersing agent into 1L of water, and uniformly stirring to ensure that the dispersing agent can be fully dissolved in the water to be used as a grinding medium, wherein the weight of calcium gluconate is 0.4 percent of that of the pre-sintered material ball, and the ratio of sodium polyacrylate to calcium gluconate is 3: 1;
s12: adjusting the pH value of the grinding medium by using ammonia water to enable the pH value to reach 9.5;
s13: adding 0.6kg of material balls and grinding media into a ball milling tank in sequence for grinding;
s14: grinding the ball milling slurry in the step S13 to 1.15um in granularity;
s15: and (5) washing, tempering, drying and powdering the ferrite ball-milling slurry obtained in the step (S14) to obtain bonded permanent magnetic ferrite powder.
3. The dispersing agent for improving the magnetic property of the bonded permanent magnetic ferrite material according to claim 1, wherein the dispersing agent comprises: in the step S01, the mass ratio of the sodium polyacrylate to the calcium gluconate is 2-5: 1.
4. The dispersing agent for improving the magnetic property of the bonded permanent magnetic ferrite material according to claim 1, wherein the dispersing agent comprises: in step S02, the grinding medium: adding the dispersing agent into water, and stirring uniformly to enable the dispersing agent to be capable of fully dissolving in the water.
5. The dispersing agent for improving the magnetic property of the bonded permanent magnetic ferrite material according to claim 4, characterized in that: the pH of the grinding medium can be adjusted by ammonia water to control the pH of the solution at 8-12.
6. The dispersing agent for improving the magnetic property of the bonded permanent magnetic ferrite material according to claim 1, which is characterized in that: in step S03, the bonded permanent magnetic ferrite pre-sintered material balls and the grinding medium are added into a ball mill, and the ball mill is started to grind.
7. The dispersing agent for improving the magnetic property of the bonded permanent magnetic ferrite material according to claim 1, which is characterized in that: the mass of the pre-sintering material ball is the mass of the grinding medium: 0.5-0.75; the particle size is controlled to be 1.1-1.2 um.
8. The dispersing agent for improving the magnetic property of the bonded permanent magnetic ferrite material according to claim 1, which is characterized in that: the tempering temperature is controlled to be about 920 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110634054.3A CN113562769A (en) | 2021-06-07 | 2021-06-07 | Dispersing agent and method for improving magnetic property of bonded permanent magnetic ferrite material |
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| CN202110634054.3A CN113562769A (en) | 2021-06-07 | 2021-06-07 | Dispersing agent and method for improving magnetic property of bonded permanent magnetic ferrite material |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09266110A (en) * | 1996-03-27 | 1997-10-07 | Nippon Zeon Co Ltd | Dispersant for hard ferrite material powdered metal oxide |
| CN101354939A (en) * | 2008-05-04 | 2009-01-28 | 横店集团东磁股份有限公司 | Method for preparing superfine permanent ferrite forming slurry |
| CN102898127A (en) * | 2012-10-18 | 2013-01-30 | 北矿磁材科技股份有限公司 | Sintered permanent magnetic ferrite and manufacture method thereof |
| CN103803960A (en) * | 2013-12-31 | 2014-05-21 | 北矿磁材科技股份有限公司 | Preparation method of permanent magnetic ferrite material |
| CN104446519A (en) * | 2014-12-16 | 2015-03-25 | 湖南航天磁电有限责任公司 | Dispersant and method for improving magnetic property of permanent magnetic ferrite |
| CN112341181A (en) * | 2020-11-17 | 2021-02-09 | 湖南航天磁电有限责任公司 | Method for improving magnetic property of permanent magnetic ferrite |
-
2021
- 2021-06-07 CN CN202110634054.3A patent/CN113562769A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09266110A (en) * | 1996-03-27 | 1997-10-07 | Nippon Zeon Co Ltd | Dispersant for hard ferrite material powdered metal oxide |
| CN101354939A (en) * | 2008-05-04 | 2009-01-28 | 横店集团东磁股份有限公司 | Method for preparing superfine permanent ferrite forming slurry |
| CN102898127A (en) * | 2012-10-18 | 2013-01-30 | 北矿磁材科技股份有限公司 | Sintered permanent magnetic ferrite and manufacture method thereof |
| CN103803960A (en) * | 2013-12-31 | 2014-05-21 | 北矿磁材科技股份有限公司 | Preparation method of permanent magnetic ferrite material |
| CN104446519A (en) * | 2014-12-16 | 2015-03-25 | 湖南航天磁电有限责任公司 | Dispersant and method for improving magnetic property of permanent magnetic ferrite |
| CN112341181A (en) * | 2020-11-17 | 2021-02-09 | 湖南航天磁电有限责任公司 | Method for improving magnetic property of permanent magnetic ferrite |
Non-Patent Citations (2)
| Title |
|---|
| 王玉英等: "葡萄糖酸钙对锶铁氧体球磨效率和磁性能的影响", 《磁性材料及器件》 * |
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Application publication date: 20211029 |