CN102976767A - Method for selecting dry-pressed strontium permanent ferrite binding agent without loss of coercive force - Google Patents
Method for selecting dry-pressed strontium permanent ferrite binding agent without loss of coercive force Download PDFInfo
- Publication number
- CN102976767A CN102976767A CN2012105470108A CN201210547010A CN102976767A CN 102976767 A CN102976767 A CN 102976767A CN 2012105470108 A CN2012105470108 A CN 2012105470108A CN 201210547010 A CN201210547010 A CN 201210547010A CN 102976767 A CN102976767 A CN 102976767A
- Authority
- CN
- China
- Prior art keywords
- fine grinding
- binding agent
- magnetic
- magnesium stearate
- dry
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Hard Magnetic Materials (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
The invention discloses a method for selecting a dry-pressed strontium permanent ferrite binding agent without loss of coercive force. The method comprises the following steps of coarse grinding, preliminary fine grinding, secondary formulation, secondary fine grinding, discharging and draining, drymagnetic shaping and sintering of a finished product. According to the method, magnesium stearate is adopted for replacing calcium stearate to be used as the dry-pressed permanent ferrite binding agent, the good lubricating and binding effects can be realized, and the coercive force of a magnet is almost not reduced.
Description
Technical field
The present invention relates to a kind of addition means of binding agent, what be specifically related to is not lose coercitive dry method compacting strontium permanent-magnet ferrite binding agent selecting method.
Background technology
In permanent magnetic ferrite magnetic powder dry-pressing pressing process, in order to make magnetic particle favorable orientation in magnetic field, perfect condition is that each single domain magnetic particle can both be orientated along outer magnetic field direction, friction resistance is little between the requirement particulate, each particle can both freely rotate, and namely particle has certain dispersiveness and oilness, but cohesion is stronger between the single domain particulate, dispersed, oilness is relatively poor, so that particle orientations difficulty in magnetic field.On the other hand, in order to make the permanent-magnet ferrite pressed compact have certain physical strength, require to have certain viscosifying power between the powder, can strike up partnership under pressure to meet the requirements of density and intensity, make the unlikely appearance cracking of product, aliquation, fall the problems such as piece, unfilled corner, but simple permanent magnetic ferrite magnetic powder does not have cohesiveness, so permanent-magnet ferrite must add orientation and moulding that binding agent utilizes its dispersiveness, oilness and cohesiveness realization magnet in dry method compression moulding process.Usually the binding agent that adopts has camphor and calcium stearate.It is relatively more difficult that a kind of binding agent will have good dispersiveness, oilness and binding property simultaneously.What add in the general industry production is the mixture of camphor and calcium stearate.However, we find that in test and production practice the interpolation of calcium stearate tends to cause coercitive rapid reduction.In the motor application of reality, suppress the demagnetizing effect that causes because of reverse electromagnetic field that temperature variation and heavy current impact cause thereby require permanent-magnet ferrite to have high magnetic strength coercive force and HCJ.Therefore coercitive reduction meeting causes restriction to the application of permanent-magnet ferrite.
Summary of the invention
Goal of the invention: the objective of the invention is in order to remedy the deficiencies in the prior art, purpose is to provide the selecting method that does not lose coercitive dry method compacting strontium permanent-magnet ferrite binding agent.
The technical solution used in the present invention: a kind of coercitive dry method compacting strontium permanent-magnet ferrite binding agent selecting method that do not lose may further comprise the steps:
(1) corase grind: adopt dry ball that the strontium permanent ferrite prefiring material is roughly ground 2 ~ 3hr, 100 mesh sieves are crossed in discharging, and granularity of magnet powder is distributed as 3 ~ 5 μ m;
(2) preliminary fine grinding: the magnetic after the corase grind is added hydromining carry out preliminary fine grinding 4hr with ball mill;
(3) secondary prescription: the magnesium stearate that adds in the magnetic after preliminary fine grinding;
(4) secondary fine grinding: will be mixed with further fine grinding 4 ~ 6 hr of preliminary fine grinding magnetic of magnesium stearate binding agent, the camphor that adds again 1-2wt% continues ball milling 30-40min;
(5) discharging drainage: with secondary fine grinding slurry dewatering to water content at 30 ~ 40wt%;
(6) drymagnetic shaping: add the compression moulding of alignment magnetic field 0.5T dry method, make green compact;
(7) finished product sintering: green compact are placed on sintering on the pushed bat kiln, and sintering temperature is 1230 ~ 1260 ℃, is incubated 100 ~ 150 minutes.
As preferably, in the described step (3), the addition of Magnesium Stearate is 0.2-0.6 wt%.
As preferably, in the described step (4), the magnetic mean particle size after the secondary fine grinding is 0.7-0.8 μ m.
Beneficial effect: the present invention is compared with existing technology, and adopts magnesium stearate to replace calcium stearate as the binding agent of dry-pressing permanent-magnet ferrite, not only plays the effect of good lubricated and bonding, and reduces hardly the coercive force of magnet.
Embodiment
A kind of direct-current machine audible noise removing method of magnetic shoe may further comprise the steps:
Embodiment 1:
A kind of coercitive dry method compacting strontium permanent-magnet ferrite binding agent selecting method that do not lose may further comprise the steps:
(1) corase grind: adopt dry ball that the strontium permanent ferrite prefiring material is roughly ground 2hr, 100 mesh sieves are crossed in discharging, and granularity of magnet powder is distributed as 3 μ m;
(2) preliminary fine grinding: the magnetic after the corase grind is added hydromining carry out preliminary fine grinding 4hr with ball mill;
(3) secondary prescription: add magnesium stearate in the magnetic after preliminary fine grinding;
(4) secondary fine grinding: will be mixed with further fine grinding 4 hr of preliminary fine grinding magnetic of magnesium stearate binding agent, the camphor that adds again 1wt% continues ball milling 30min;
(5) discharging drainage: with secondary fine grinding slurry dewatering to water content at 30wt%;
(6) drymagnetic shaping: add the compression moulding of alignment magnetic field 0.5T dry method, make green compact;
(7) finished product sintering: green compact are placed on sintering on the pushed bat kiln, and sintering temperature is 1230 ℃, is incubated 100 minutes.
In the described step (3), the addition of Magnesium Stearate is 0.2 wt%.
In the described step (4), the magnetic mean particle size after the secondary fine grinding is 0.7 μ m.
Through mill processing, it is as shown in table 1 to test its magnetic parameter, and the present invention is compared with existing technology, and adopts magnesium stearate to replace calcium stearate as the binding agent of dry-pressing permanent-magnet ferrite, not only play the effect of good lubricated and bonding, and reduce hardly the coercive force of magnet.
Embodiment 2:
A kind of coercitive dry method compacting strontium permanent-magnet ferrite binding agent selecting method that do not lose may further comprise the steps:
(1) corase grind: adopt dry ball that the strontium permanent ferrite prefiring material is roughly ground 3hr, 100 mesh sieves are crossed in discharging, and granularity of magnet powder is distributed as 5 μ m;
(2) preliminary fine grinding: the magnetic after the corase grind is added hydromining carry out preliminary fine grinding 4hr with ball mill;
(3) secondary prescription: the magnesium stearate that adds in the magnetic after preliminary fine grinding;
(4) secondary fine grinding: will be mixed with further fine grinding 6 hr of preliminary fine grinding magnetic of magnesium stearate binding agent, the camphor that adds again 2wt% continues ball milling 40min;
(5) discharging drainage: with secondary fine grinding slurry dewatering to water content at 40wt%;
(6) drymagnetic shaping: add the compression moulding of alignment magnetic field 0.5T dry method, make green compact;
(7) finished product sintering: green compact are placed on sintering on the pushed bat kiln, and sintering temperature is 1260 ℃, is incubated 150 minutes.
In the described step (3), the addition of Magnesium Stearate is 0.6 wt%.
In the described step (4), the magnetic mean particle size after the secondary fine grinding is 0.8 μ m.
Through mill processing, it is as shown in table 1 to test its magnetic parameter, and the present invention is compared with existing technology, and adopts magnesium stearate to replace calcium stearate as the binding agent of dry-pressing permanent-magnet ferrite, not only play the effect of good lubricated and bonding, and reduce hardly the coercive force of magnet.
Embodiment 3:
A kind of coercitive dry method compacting strontium permanent-magnet ferrite binding agent selecting method that do not lose may further comprise the steps:
(1) corase grind: adopt dry ball that the strontium permanent ferrite prefiring material is roughly ground 2.5hr, 100 mesh sieves are crossed in discharging, and granularity of magnet powder is distributed as 4 μ m;
(2) preliminary fine grinding: the magnetic after the corase grind is added hydromining carry out preliminary fine grinding 4hr with ball mill;
(3) secondary prescription: the magnesium stearate that adds in the magnetic after preliminary fine grinding;
(4) secondary fine grinding: will be mixed with further fine grinding 5 hr of preliminary fine grinding magnetic of magnesium stearate binding agent, the camphor that adds again 1.5wt% continues ball milling 35min;
(5) discharging drainage: with secondary fine grinding slurry dewatering to water content at 35wt%;
(6) drymagnetic shaping: add the compression moulding of alignment magnetic field 0.5T dry method, make green compact;
(7) finished product sintering: green compact are placed on sintering on the pushed bat kiln, and sintering temperature is 1250 ℃, is incubated 130 minutes.
In the step (3), the addition of Magnesium Stearate is 0.4 wt%.In the step (4), the magnetic mean particle size after the secondary fine grinding is 0.75 μ m.
Through mill processing, it is as shown in table 1 to test its magnetic parameter, and the present invention is compared with existing technology, and adopts magnesium stearate to replace calcium stearate as the binding agent of dry-pressing permanent-magnet ferrite, not only play the effect of good lubricated and bonding, and reduce hardly the coercive force of magnet.
Table 1
According to above embodiment, the addition of calcium stearate increases, and incident is HCJ H
CJThe reduction of value, when the calcium stearate addition is 0.6wt%, HCJ H
CJDescending is about 103Oe, but smaller on the impact of remanent magnetism Br; The interpolation of magnesium stearate is then to HCJ H
CJValue is not impact almost, but but causes remanent magnetism Br value but significantly to reduce, and when the addition of magnesium stearate was 0.6wt%, remanent magnetism Br value reduced about 70Gs.Although the interpolation of magnesium stearate can reduce the remanent magnetism of magnet to a certain extent, affect the power stage of motor, this point can solve by suitably increasing magnet volume.
This implementation embodiment is not only applicable to the tile-type magnet steel, and to the ring-shaped sintered magnet steel of utmost point anisotropy, has same effect yet.
Claims (3)
1. one kind is not lost coercitive dry method compacting strontium permanent-magnet ferrite binding agent selecting method, it is characterized in that: may further comprise the steps:
Corase grind: adopt dry ball that the strontium permanent ferrite prefiring material is roughly ground 2 ~ 3hr, 100 mesh sieves are crossed in discharging, and granularity of magnet powder is distributed as 3 ~ 5 μ m;
Preliminary fine grinding: the magnetic after the corase grind is added hydromining carry out preliminary fine grinding 4hr with ball mill;
Secondary prescription: the magnesium stearate that adds in the magnetic after preliminary fine grinding;
The secondary fine grinding: will be mixed with further fine grinding 4 ~ 6 hr of preliminary fine grinding magnetic of magnesium stearate binding agent, the camphor that adds again 1-2wt% continues ball milling 30-40min;
The discharging drainage: with secondary fine grinding slurry dewatering to water content at 30 ~ 40wt%;
Drymagnetic shaping: add the compression moulding of alignment magnetic field 0.5T dry method, make green compact;
The finished product sintering: green compact are placed on sintering on the pushed bat kiln, and sintering temperature is 1230 ~ 1260 ℃, is incubated 100 ~ 150 minutes.
2. the coercitive dry method compacting strontium permanent-magnet ferrite binding agent selecting method that do not lose as claimed in claim 1, it is characterized in that: in the described step (3), the addition of Magnesium Stearate is 0.2-0.6 wt%.
3. the coercitive dry method compacting strontium permanent-magnet ferrite binding agent selecting method that do not lose as claimed in claim 1, it is characterized in that: in the described step (4), the magnetic mean particle size after the secondary fine grinding is 0.7-0.8 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210547010.8A CN102976767B (en) | 2012-12-17 | 2012-12-17 | Method for selecting dry-pressed strontium permanent ferrite binding agent without loss of coercive force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210547010.8A CN102976767B (en) | 2012-12-17 | 2012-12-17 | Method for selecting dry-pressed strontium permanent ferrite binding agent without loss of coercive force |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102976767A true CN102976767A (en) | 2013-03-20 |
| CN102976767B CN102976767B (en) | 2014-08-06 |
Family
ID=47851176
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210547010.8A Active CN102976767B (en) | 2012-12-17 | 2012-12-17 | Method for selecting dry-pressed strontium permanent ferrite binding agent without loss of coercive force |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102976767B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103304229A (en) * | 2013-06-14 | 2013-09-18 | 南通飞来福磁铁有限公司 | Process for forming high-orientation dry-press permanent magnetic ferrite |
| CN104496452A (en) * | 2014-12-31 | 2015-04-08 | 北矿磁材科技股份有限公司 | Ferrite preparation method and prepared ferrite thereby |
| CN106830093A (en) * | 2017-02-23 | 2017-06-13 | 海安县巨力磁材有限责任公司 | The preparation method of high-performance permanent-magnet ferrite |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101205137A (en) * | 2007-01-18 | 2008-06-25 | 横店集团东磁股份有限公司 | Method for manufacturing dry-pressing formed sintered permanent ferrite |
| CN101364467A (en) * | 2008-06-12 | 2009-02-11 | 青岛科技大学 | Preparation of ferrite magnetic spliced magnet having great processability |
| CN102136332A (en) * | 2010-12-13 | 2011-07-27 | 北矿磁材科技股份有限公司 | Permanent magnet ferrite material for injection molding and manufacture method thereof |
| CN102173768A (en) * | 2011-01-21 | 2011-09-07 | 海安县巨力磁材有限责任公司 | Preparation method of high-performance radially isotropic dry pressing permanent magnetic ferrite |
-
2012
- 2012-12-17 CN CN201210547010.8A patent/CN102976767B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101205137A (en) * | 2007-01-18 | 2008-06-25 | 横店集团东磁股份有限公司 | Method for manufacturing dry-pressing formed sintered permanent ferrite |
| CN101364467A (en) * | 2008-06-12 | 2009-02-11 | 青岛科技大学 | Preparation of ferrite magnetic spliced magnet having great processability |
| CN102136332A (en) * | 2010-12-13 | 2011-07-27 | 北矿磁材科技股份有限公司 | Permanent magnet ferrite material for injection molding and manufacture method thereof |
| CN102173768A (en) * | 2011-01-21 | 2011-09-07 | 海安县巨力磁材有限责任公司 | Preparation method of high-performance radially isotropic dry pressing permanent magnetic ferrite |
Non-Patent Citations (1)
| Title |
|---|
| 刘先松 等: "高性能各向异性干压永磁铁氧体的研制", 《磁性材料及器件》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103304229A (en) * | 2013-06-14 | 2013-09-18 | 南通飞来福磁铁有限公司 | Process for forming high-orientation dry-press permanent magnetic ferrite |
| CN103304229B (en) * | 2013-06-14 | 2015-01-21 | 南通飞来福磁铁有限公司 | Process for forming high-orientation dry-press permanent magnetic ferrite |
| CN104496452A (en) * | 2014-12-31 | 2015-04-08 | 北矿磁材科技股份有限公司 | Ferrite preparation method and prepared ferrite thereby |
| CN106830093A (en) * | 2017-02-23 | 2017-06-13 | 海安县巨力磁材有限责任公司 | The preparation method of high-performance permanent-magnet ferrite |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102976767B (en) | 2014-08-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101599333B (en) | Method for manufacturing anisotropic multi-pole magnetic ring through dry-press forming | |
| CN102690108B (en) | Permanent magnetic ferrite production method and magnetic body thereof | |
| CN105622082B (en) | A kind of preparation method of permanent-magnet ferrite anisotropic dry press-powder material | |
| CN103065787A (en) | Method for preparing sintered neodymium-iron-boron magnet | |
| CN102976767B (en) | Method for selecting dry-pressed strontium permanent ferrite binding agent without loss of coercive force | |
| CN100481281C (en) | Process for clinkering anisotropic permanent ferrite through polymer bonding and modeling | |
| CN102050619A (en) | Method for preparing permanent magnet oxysome material | |
| CN104496452A (en) | Ferrite preparation method and prepared ferrite thereby | |
| CN104496458A (en) | Manufacturing method of dry-pressed anisotropic ferrite magnetic powder | |
| CN106365626A (en) | Manufacturing method of dry-press anisotropic ferrite | |
| CN104446519A (en) | Dispersant and method for improving magnetic property of permanent magnetic ferrite | |
| CN103065760A (en) | Integral type anisotropic multipolar ferrite bead and preparation method thereof | |
| CN109836147B (en) | Permanent magnetic ferrite and preparation method thereof | |
| CN109102977B (en) | High-density dry-pressed anisotropic ferrite magnet and manufacturing method thereof | |
| CN105418062A (en) | Permanent ferrite and preparation method thereof | |
| CN111423226B (en) | Permanent magnetic ferrite and preparation method and application thereof | |
| CN106145917A (en) | A kind of coercitive secondary of permanently magnetic strontium ferrite that improves is combined adding method | |
| CN102173768B (en) | Preparation method of high-performance radially isotropic dry pressing permanent magnetic ferrite | |
| CN113651608A (en) | Dry-pressing permanent magnetic ferrite and preparation method and application thereof | |
| CN104446418B (en) | A kind of method improving permanent magnetic ferrite residual magnetization and HCJ | |
| CN114014644A (en) | Calcium permanent magnetic ferrite material and preparation method thereof | |
| CN111943660B (en) | Strontium permanent magnetic ferrite, preparation method and dispersing agent used by preparation method | |
| CN106587974B (en) | Method for improving remanence of dry-pressing powder molding permanent magnetic ferrite | |
| CN108285348A (en) | A kind of manufacturing method of dry-pressing opposite sex permanent-magnet ferrite magnetic powder | |
| CN112321294A (en) | Ferrite permanent magnetic material and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |