CN104591744A - Method for improving magnetic properties of permanent magnetic ferrite by adding combined dispersing agent - Google Patents
Method for improving magnetic properties of permanent magnetic ferrite by adding combined dispersing agent Download PDFInfo
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- CN104591744A CN104591744A CN201410826450.6A CN201410826450A CN104591744A CN 104591744 A CN104591744 A CN 104591744A CN 201410826450 A CN201410826450 A CN 201410826450A CN 104591744 A CN104591744 A CN 104591744A
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Abstract
The invention provides a method for improving magnetic properties of a permanent magnetic ferrite by adding a combined dispersing agent. During preparation of the permanent magnetic ferrite, multiple additives are needed to be added in a secondary technology, the additives mainly comprise calcium carbonate, silicon dioxide, aluminium oxide, chromium oxide, kaolin, lanthanum oxide and cobalt oxide, and the additives have different influences on the magnetic properties, such as residual magnetism and coercive force of magnets. The method is characterized in that the combined dispersing agent besides one or more than one of calcium carbonate, silicon dioxide, aluminium oxide, chromium oxide, kaolin, lanthanum oxide and cobalt oxide is added in a secondary technology of a permanent magnetic strontium ferrite preparation process, and the combined dispersing agent comprises 0.1-0.15% of boric acid (calculated by weight percentage of magnetic powder) and 0.3-0.6% of calcium gluconate (calculated by the weight percentage of the magnetic powder). By adding the combined dispersing agent, the residual magnetism can be increased by 30-100(Gs), and the coercive force (Hcj) can be improved by 100-200(Oe).
Description
Technical field
The invention belongs to permanent-magnet ferrite preparing technical field, particularly relate to a kind of method adding combined dispersant raising permanent-magnet ferrite magnetic property.
Background technology
Permanent-magnet ferrite mainly contains strontium ferrites and barium ferrite, and its magnetic property technical indicator mainly contains remanent magnetism, coercive force, magnetic energy product.These three technical indicators are that more high magnetic characteristics is better.
The production of permanent-magnet ferrite mainly contains two-step sintering technique and once sintered secondary bonding process.Two-step sintering technique refers to, first sintering chemical combination forms Ferrite Material, then makes ferrimagnet through secondary processes sintering.Once sintered secondary bonding process is, first sintering chemical combination forms Ferrite Material, then makes ferrimagnet through secondary processes knot.Two-step sintering technique according to the difference of the moulding process in second time technique, have again dry-pressing formed and Wet-pressing molding point.The magnetic property of the ferrimagnet that Wet-pressing molding is made, far above the magnetic property of dry-pressing formed ferrimagnet.In Wet-pressing molding process, the orientation degree of magnetic particle in magnetic field is larger, and the anisotropy degree of alignment of magnetic particle in magnet is higher, and the magnetic property of magnet is stronger.The orientation degree of magnetic particle in magnetic field depends primarily on the magnetic property particularly size of remanent magnetism, the pattern of magnetic particle and the dispersity thereof of magneticstrength, magnetic particle, also has comparatively Important Relations with the water ratio of magnetic simultaneously.The present invention improves the orientation degree of magnetic particle in magnetic field by adding combined dispersant in secondary processes, under the condition that other conditions are identical, the magnetic property of magnet is improved significantly.
In invention is held
The object of the invention is to improve the orientation degree of magnetic particle in magnetic field by adding combined dispersant in secondary processes, under the condition that other conditions are identical, the magnetic property of magnet being improved significantly.
The invention provides a kind of method adding combined dispersant raising permanent-magnet ferrite magnetic property.Preparing in permanent-magnet ferrite production, in secondary processes, all multiple additives will be added.Mainly contain calcium carbonate, silicon-dioxide, aluminum oxide, chromic oxide, kaolin, lanthanum trioxide, cobalt oxide.These additives have different influence powers to the magnetic property remanent magnetism of magnet, coercive force.To the invention is characterized in the secondary processes preparing permanent-magnet ferrite except the 1-7 kind added in calcium carbonate, silicon-dioxide, aluminum oxide, chromic oxide, kaolin, lanthanum trioxide, cobalt oxide, add combined dispersant of the present invention, it consists of: boric acid (calculating by magnetic weight percent) 0.1 ~ 0.15%+ calglucon (calculating by magnetic weight percent) 0.3 ~ 0.6%.
In secondary processes wet-milling, add dispersion agent, be conducive to improving magnetic dispersion of particles degree.Boric acid is as additive, both double sintering can be reduced, also certain dispersion agent effect is had, if but the weight percent of add-on more than 0.3%, will obviously make magnet more responsive to double sintering temperature, sintering warm area narrows, sintering temperature controlling extent strengthens, make product easily occur underburnt or burning, magnet also can be made in addition to become fragile and reduce hardness, and cause yield rate in magnet grinding process flow process to reduce.Calglucon is as dispersion agent, if the weight percent of add-on more than 0.6%, can cause absorbing water during Wet-pressing molding difficulty, the press time be extended, even causes running pulp.And if add-on is lower than the weight percent of 0.6%, dispersion effect is not obvious.Other conditions are identical in secondary processes, add combined dispersant of the present invention: boric acid (calculating by magnetic weight percent) 0.1 ~ 0.15%+ calglucon (calculating by magnetic weight percent) 0.3 ~ 0.6%.Magnetic dispersion of particles degree when can improve secondary ball milling, thus the orientation degree of magnetic particle in magnetic field when improving Wet-pressing molding, improve magnet magnetic property, remanent magnetism can improve 30 ~ 100 (Gs), coercive force (Hcj) can improve 100 ~ 200 (Oe), can overcome again and add single dispersion agent too much or not enough and defect that is that produce.
Accompanying drawing explanation
Fig. 1 is twice process flow sheet prepared by permanent-magnet ferrite.Wherein, once sintered 1, dry grinding broken 2, add additive and dispersion agent batching 3, wet method fine grinding 4, precipitates into slip 5, wet pressing (magnetic field) shaping 6, double sintering 7, and mill processing 8, magnetizes 9, detects magnetic property 10.
Embodiment
The technical process of example is: the once sintered ball material → dry grinder fragmentation (less than 6 microns) of strontium ferrites → add additive and dispersion agent batching (secondary processes formula) → dress ball mill add water wet-milling → discharging precipitation → magnetic field Wet-pressing molding → double sintering → cut processing → detection magnetic property.
Embodiment one, the once sintered ball material using our company to produce is raw material, and secondary processes formula is:
A, calcium carbonate 1.2wt%, silicon-dioxide 0.2wt%.
B, calcium carbonate 1.2wt%, silicon-dioxide 0.2wt%, boric acid 0.15wt%.
C, calcium carbonate 1.2wt%, silicon-dioxide 0.2wt%, calglucon 0.6wt%.
D, calcium carbonate 1.2wt%, silicon-dioxide 0.2wt%, combined dispersant 0.6wt% of the present invention (wherein: boric acid 0.1wt%+ calglucon 0.5wt%).
Under the condition that other techniques are identical, obtained magnet magnetic property shows, adds the remanent magnetism after combined dispersant of the present invention and coercive force is all significantly improved.Table 1 is the comparing result of A, B, C, D.
Table 1 is the comparing result of A, B, C, D
| Classification | B(Gr) | Hbj(Oe) | Hcj(Oe) | (BH) m(MGOe) |
| A | 4120 | 2790 | 2860 | 4.02 |
| B | 4170 | 2730 | 2850 | 4.05 |
| C | 4160 | 2810 | 2900 | 4.04 |
| D | 4230 | 2980 | 3090 | 4.28 |
Embodiment two, the once sintered ball material using our company to produce is raw material, and secondary processes formula is:
E, calcium carbonate 1.35wt%, silicon-dioxide 0.2wt%, aluminum oxide 0.35wt%, lanthanum trioxide 1.0wt%, cobalt oxide 0.3wt%.
F, calcium carbonate 1.35wt%, silicon-dioxide 0.2wt%, aluminum oxide 0.35wt%, lanthanum trioxide 1.0wt%, cobalt oxide 0.3wt%, boric acid 0.15wt%.
G, calcium carbonate 1.35wt%, silicon-dioxide 0.2wt%, aluminum oxide 0.35wt%, lanthanum trioxide 1.0wt%, cobalt oxide 0.3wt%, calglucon 0.6wt%.
H, calcium carbonate 1.35wt%, silicon-dioxide 0.2wt%, aluminum oxide 0.35wt%, lanthanum trioxide 1.0wt%, cobalt oxide 0.3wt%, combined dispersant 0.6wt% of the present invention (wherein: boric acid 0.1wt%+ calglucon 0.5wt%).
Under the condition that other techniques are identical, obtained magnet magnetic property shows, adds the remanent magnetism after combined dispersant of the present invention and coercive force is all significantly improved.Table 2 is comparing results of E, F, G, H.
Table 1 is the comparing result of E, F, G, H
| Classification | B(Gr) | Hbj(Oe) | Hcj(Oe) | (BH) m(MGOe) |
| E | 4030 | 3020 | 3220 | 4.01 |
| F | 4180 | 2970 | 3110 | 4.15 |
| G | 4170 | 2940 | 3190 | 4.12 |
| H | 4220 | 3140 | 3370 | 4.27 |
According to the comparing result of example above, add combined additive of the present invention, remanent magnetism can improve 30 ~ 100 (Gs), and coercive force (Hcj) can improve 100 ~ 200 (Oe), can also overcome and add single dispersion agent too much or not enough and defect that is that produce.
Claims (1)
1. one kind adds the method that combined dispersant improves permanent-magnet ferrite magnetic property, it is characterized in that, in the secondary processes preparing permanent-magnet ferrite except adding other additives, add combined dispersant of the present invention, consisting of of described combined dispersant: boric acid 0.1 ~ 0.15wt%+ calglucon 0.3 ~ 0.6wt%.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108585821A (en) * | 2018-05-24 | 2018-09-28 | 成都锦钛精工科技有限公司 | Solid solution structure additive and preparation method and the application in ferrite permanent-magnet materials preparation |
| CN110372362A (en) * | 2019-07-15 | 2019-10-25 | 横店集团东磁股份有限公司 | A kind of preparation method and permanent-magnet ferrite material of permanent-magnet ferrite material |
| CN110828091A (en) * | 2019-11-21 | 2020-02-21 | 广东华南半导体光电研究院有限公司 | Preparation method of environment-friendly magnet |
| CN112500148A (en) * | 2020-11-27 | 2021-03-16 | 天长市中德电子有限公司 | Preparation method of high-coercivity strontium ferrite magnetic material |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101996722A (en) * | 2009-08-25 | 2011-03-30 | 佛山市顺德区江粉霸菱磁材有限公司 | Preparation method of permanent ferrite |
| CN103232232A (en) * | 2013-05-13 | 2013-08-07 | 南京梅山冶金发展有限公司 | Permanent magnetic ferrite preparation method |
| 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 |
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2014
- 2014-12-19 CN CN201410826450.6A patent/CN104591744A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101996722A (en) * | 2009-08-25 | 2011-03-30 | 佛山市顺德区江粉霸菱磁材有限公司 | Preparation method of permanent ferrite |
| CN103232232A (en) * | 2013-05-13 | 2013-08-07 | 南京梅山冶金发展有限公司 | Permanent magnetic ferrite preparation method |
| 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 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108585821A (en) * | 2018-05-24 | 2018-09-28 | 成都锦钛精工科技有限公司 | Solid solution structure additive and preparation method and the application in ferrite permanent-magnet materials preparation |
| CN108585821B (en) * | 2018-05-24 | 2020-08-04 | 成都锦钛精工科技有限公司 | Solid solution structure additive, preparation method and application in preparation of ferrite permanent magnet material |
| CN110372362A (en) * | 2019-07-15 | 2019-10-25 | 横店集团东磁股份有限公司 | A kind of preparation method and permanent-magnet ferrite material of permanent-magnet ferrite material |
| CN110828091A (en) * | 2019-11-21 | 2020-02-21 | 广东华南半导体光电研究院有限公司 | Preparation method of environment-friendly magnet |
| CN112500148A (en) * | 2020-11-27 | 2021-03-16 | 天长市中德电子有限公司 | Preparation method of high-coercivity strontium ferrite magnetic material |
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