CN102976767B - 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
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- CN102976767B CN102976767B CN201210547010.8A CN201210547010A CN102976767B CN 102976767 B CN102976767 B CN 102976767B CN 201210547010 A CN201210547010 A CN 201210547010A CN 102976767 B CN102976767 B CN 102976767B
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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 be orientated along outer magnetic field direction, between requirement particulate, friction resistance is little, each particle can freely rotate, and particle has certain dispersiveness and oilness, but between single domain particulate, cohesion is stronger, dispersed, oilness is poor, makes particle orientations difficulty in magnetic field.On the other hand, in order to make permanent-magnet ferrite pressed compact there is certain physical strength, require to there is certain viscosifying power between 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 problem such as piece, unfilled corner, but simple permanent magnetic ferrite magnetic powder does not have cohesiveness, therefore permanent-magnet ferrite must add binding agent and utilizes its dispersiveness, oilness and cohesiveness to realize orientation and the moulding of magnet in dry method compression moulding process.Conventionally the binding agent adopting has camphor and calcium stearate.It is more difficult that a kind of binding agent will have good dispersiveness, oilness and binding property simultaneously.What general industry added in producing 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 sharply reduction.In actual motor application, suppress thereby require permanent-magnet ferrite to there is high magnetic strength coercive force and HCJ the demagnetizing effect causing because of the reverse electromagnetic field that temperature variation and heavy current impact cause.Therefore coercitive reduction meeting causes restriction to the application of permanent-magnet ferrite.
Summary of the invention
Goal of the invention: the object of the invention is in order to make up the deficiencies in the prior art, object 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: one is not lost coercitive dry method compacting strontium permanent-magnet ferrite binding agent selecting method, comprises the following steps:
(1) corase grind: adopt dry ball to roughly grind 2 ~ 3hr to strontium permanent ferrite prefiring material, 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 corase grind is added water and adopts ball mill to carry out preliminary fine grinding 4hr;
(3) secondary formula: the magnesium stearate adding in the magnetic after preliminary fine grinding;
(4) secondary fine grinding: by further the preliminary fine grinding magnetic that is mixed with magnesium stearate binding agent fine grinding 4 ~ 6 hr, then add the camphor of 1-2wt% to continue ball milling 30-40min;
(5) discharging drainage: by secondary fine grinding slurry dewatering to water content at 30 ~ 40wt%;
(6) drymagnetic shaping: the compression moulding of additional alignment magnetic field 0.5T dry method, make green compact;
(7) finished product sintering: green compact are placed on to sintering on pushed bat kiln, and sintering temperature is 1230 ~ 1260 DEG C, is incubated 100 ~ 150 minutes.
As preferably, in described step (3), the addition of Magnesium Stearate is 0.2-0.6 wt%.
As preferably, in described step (4), the magnetic mean particle size after secondary fine grinding is 0.7-0.8 μ m.
Beneficial effect: compared to the prior art the present invention, adopts magnesium stearate to replace the binding agent of calcium stearate as dry-pressing permanent-magnet ferrite, not only plays the effect of good lubricated and bonding, and reduce hardly the coercive force of magnet.
Embodiment
An audible noise removing method for magnetic shoe for direct-current machine, comprises the following steps:
Embodiment 1:
One is not lost coercitive dry method compacting strontium permanent-magnet ferrite binding agent selecting method, comprises the following steps:
(1) corase grind: adopt dry ball to roughly grind 2hr to strontium permanent ferrite prefiring material, 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 corase grind is added water and adopts ball mill to carry out preliminary fine grinding 4hr;
(3) secondary formula: add magnesium stearate in the magnetic after preliminary fine grinding;
(4) secondary fine grinding: by further the preliminary fine grinding magnetic that is mixed with magnesium stearate binding agent fine grinding 4 hr, then add the camphor of 1wt% to continue ball milling 30min;
(5) discharging drainage: by secondary fine grinding slurry dewatering to water content at 30wt%;
(6) drymagnetic shaping: the compression moulding of additional alignment magnetic field 0.5T dry method, make green compact;
(7) finished product sintering: green compact are placed on to sintering on pushed bat kiln, and sintering temperature is 1230 DEG C, is incubated 100 minutes.
In described step (3), the addition of Magnesium Stearate is 0.2 wt%.
In described step (4), the magnetic mean particle size after secondary fine grinding is 0.7 μ m.
Through mill processing, test its magnetic parameter as shown in table 1, compared to the prior art the present invention, adopts magnesium stearate to replace the binding agent of calcium stearate as 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:
One is not lost coercitive dry method compacting strontium permanent-magnet ferrite binding agent selecting method, comprises the following steps:
(1) corase grind: adopt dry ball to roughly grind 3hr to strontium permanent ferrite prefiring material, 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 corase grind is added water and adopts ball mill to carry out preliminary fine grinding 4hr;
(3) secondary formula: the magnesium stearate adding in the magnetic after preliminary fine grinding;
(4) secondary fine grinding: by further the preliminary fine grinding magnetic that is mixed with magnesium stearate binding agent fine grinding 6 hr, then add the camphor of 2wt% to continue ball milling 40min;
(5) discharging drainage: by secondary fine grinding slurry dewatering to water content at 40wt%;
(6) drymagnetic shaping: the compression moulding of additional alignment magnetic field 0.5T dry method, make green compact;
(7) finished product sintering: green compact are placed on to sintering on pushed bat kiln, and sintering temperature is 1260 DEG C, is incubated 150 minutes.
In described step (3), the addition of Magnesium Stearate is 0.6 wt%.
In described step (4), the magnetic mean particle size after secondary fine grinding is 0.8 μ m.
Through mill processing, test its magnetic parameter as shown in table 1, compared to the prior art the present invention, adopts magnesium stearate to replace the binding agent of calcium stearate as 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:
One is not lost coercitive dry method compacting strontium permanent-magnet ferrite binding agent selecting method, comprises the following steps:
(1) corase grind: adopt dry ball to roughly grind 2.5hr to strontium permanent ferrite prefiring material, 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 corase grind is added water and adopts ball mill to carry out preliminary fine grinding 4hr;
(3) secondary formula: the magnesium stearate adding in the magnetic after preliminary fine grinding;
(4) secondary fine grinding: by further the preliminary fine grinding magnetic that is mixed with magnesium stearate binding agent fine grinding 5 hr, then add the camphor of 1.5wt% to continue ball milling 35min;
(5) discharging drainage: by secondary fine grinding slurry dewatering to water content at 35wt%;
(6) drymagnetic shaping: the compression moulding of additional alignment magnetic field 0.5T dry method, make green compact;
(7) finished product sintering: green compact are placed on to sintering on pushed bat kiln, and sintering temperature is 1250 DEG C, is incubated 130 minutes.
In step (3), the addition of Magnesium Stearate is 0.4 wt%.In step (4), the magnetic mean particle size after secondary fine grinding is 0.75 μ m.
Through mill processing, test its magnetic parameter as shown in table 1, compared to the prior art the present invention, adopts magnesium stearate to replace the binding agent of calcium stearate as 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, in the time that calcium stearate addition is 0.6wt%, HCJ H
cJdecline and be about 103Oe, but smaller on the impact of remanent magnetism Br; The interpolation of magnesium stearate is to HCJ H
cJvalue does not almost affect, but but causes remanent magnetism Br value but significantly to reduce, and in the time that the addition of magnesium stearate is 0.6wt%, remanent magnetism Br value reduces 70Gs left and right.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 concrete embodiment of implementing is not only applicable to tile-type magnet steel, and to the ring-shaped sintered magnet steel of utmost point anisotropy, has same effect yet.
Claims (1)
1. do not lose a coercitive dry method compacting strontium permanent-magnet ferrite binding agent selecting method, it is characterized in that, described method concrete steps are:
(1) corase grind: adopt dry ball to roughly grind 3hr to strontium permanent ferrite prefiring material, 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 corase grind is added water and adopts ball mill to carry out preliminary fine grinding 4hr;
(3) secondary formula: the magnesium stearate adding in the magnetic after preliminary fine grinding, the addition of Magnesium Stearate is 0.6wt%;
(4) secondary fine grinding: will be mixed with the further fine grinding 6hr of preliminary fine grinding magnetic of magnesium stearate binding agent, then add the camphor of 2wt% to continue ball milling 40min, the magnetic mean particle size after secondary fine grinding is 0.8 μ m;
(5) discharging drainage: by secondary fine grinding slurry dewatering to water content at 40wt%;
(6) drymagnetic shaping: the compression moulding of additional alignment magnetic field 0.5T dry method, make green compact;
(7) finished product sintering: green compact are placed on to sintering on pushed bat kiln, and sintering temperature is 1260 DEG C, is incubated 150 minutes.
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| 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 |
| CN104496452B (en) * | 2014-12-31 | 2017-07-18 | 北矿磁材科技股份有限公司 | A kind of ferrite preparation method and its prepared ferrite |
| 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 |
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| CN101205137A (en) * | 2007-01-18 | 2008-06-25 | 横店集团东磁股份有限公司 | Method for manufacturing sintered permanent magnetic ferrite formed by dry pressing |
| 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 |
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| CN101205137A (en) * | 2007-01-18 | 2008-06-25 | 横店集团东磁股份有限公司 | Method for manufacturing sintered permanent magnetic ferrite formed by dry pressing |
| 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 |
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| 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》.2009,第40卷(第2期),38-40，60. |
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