CN103102169A - Preparation method of fiber-enhanced permanent magnetic ferrite - Google Patents
Preparation method of fiber-enhanced permanent magnetic ferrite Download PDFInfo
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- CN103102169A CN103102169A CN2013100751557A CN201310075155A CN103102169A CN 103102169 A CN103102169 A CN 103102169A CN 2013100751557 A CN2013100751557 A CN 2013100751557A CN 201310075155 A CN201310075155 A CN 201310075155A CN 103102169 A CN103102169 A CN 103102169A
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Abstract
The invention discloses a preparation method of a fiber-enhanced permanent magnetic ferrite, relates to a preparation method of a permanent magnetic ferrite and belongs to the field of new materials and preparation methods thereof. The preparation method comprises the following steps of: rough grinding, primary fine grinding, zinc stearate adding, secondary fine grinding, discharging and draining, forming and sintering. By using the dispersion of high-strength aluminum silicate fiber in a ferrite matrix, the propagation direction is changed, or turned or branched when a fiber interface appears in a crack propagation process to ensure that the propagation is dispersed or reduced, the cleavage and the fracture of a magnet are stopped and the crack propagation resistance of the material is increased, so that the toughness of the magnet is increased, and the mechanical strength of the magnet is enhanced. In addition, the preparation method is simple in process, free of increment of production equipment and suitable for large-scale industrial production.
Description
The present invention relates to the permanent-magnet ferrite preparation method, belong to novel material and preparation field thereof.
Technical field
Magneticsubstance and element are indispensable base mateiral and kits in electronic industry, as one of magneticsubstance important branch, and permanent-magnet ferrite material mature production technology, aboundresources, cheap.In electronic industry flourish today, permanent-magnet ferrite material is with its unique good performance, and is widely used in the every field such as instrument, broadcast television, robot calculator, medical treatment device, daily living article and military affairs, hydrospace detection.This product is widely used in the high-tech areas such as automobile, motorcycle, electromobile, telecommunication, micromotor, instrument, control automatically, household electrical appliance and engineering machinery as the core parts of motor stator.
As field element, the permanent-magnet ferrite magnet is widely used in various motors.Motor is common through vibrated, impact, high low temperature changing environment at work.And permanent-magnet ferrite is firm frangible, and the mechanical property that improves permanent-magnet ferrite is very important.
Sintered permanent magnet materials production technology take the barium strontium ferrites as the basis generally adopts ceramic sintering process.In stupalith, people often pass through to adopt its fragility defective of fibre-reinforced method improvement, and then develop FRCMC, make ceramic matrix crack deflection occur to improve the mechanical property of material in breaking-down process.
Background technology
The present invention seeks to by adding aluminum silicate fiber to improving the mechanical property of sintered permanent ferrite, to satisfy its application demand in permanent-magnet ferrite.
The present invention includes following steps:
1) corase grind: adopt dry ball that the strontium permanent ferrite prefiring material is roughly ground, obtaining particle diameter is the thick magnetic powder of 3～5 μ m;
2) preliminary fine grinding: add water in the thick magnetic powder after corase grind, adopt ball mill to carry out preliminary fine grinding, obtain thin magnetic powder;
3) add Zinc Stearate, carry out the secondary fine grinding: add the Zinc Stearate that to account for thin magnetic powder total weight percent be 0.2～0.4 % in thin magnetic powder, after fine grinding 4～6 hr, then camphorate and aluminum silicate fiber, continue ball milling, obtain the slip that the magnetic mean particle size is 0.7～0.8 μ m;
4) discharging drainage: slurry dewatering to the water content of secondary fine grinding is accounted for 30～40% of slip total mass;
5) moulding: get the slip after dehydration, add alignment magnetic field 0.5T, through the dry-pressing compacting, form green compact;
6) sintering: it is to process 100～150 minutes in the sintering oven of 1230～1260 ℃ that green compact are placed on sintering temperature.
The present invention utilizes the disperse of high-intensity aluminum silicate fiber in the ferrite matrix to distribute, when making crack propagation process run into fiber interface, its propagation direction changes, or twist or bifurcated, to disperse or reduce its propagation energy, stop the cleavage fracture of magnet, improve the crack propagation drag of material, thereby increase the toughness of magnet, improve the physical strength of magnet.And technique is simple, does not increase manufacturing facilities, and is fit to large industrial production.
In addition, the L/D ratio of aluminum silicate fiber of the present invention is 1000～6000 ︰ 1.
The add-on of thin magnetic powder of the present invention accounts for 0.2～0.6% of thin magnetic powder gross weight.
The add-on of described camphor accounts for 1% of thin magnetic powder gross weight.
Embodiment
One, implement:
Example 1:
1, adopt dry ball to roughly grind 2hr to the strontium permanent ferrite prefiring material of buying, 100 mesh sieves are crossed in discharging, and obtaining the magnetic mean particle size is 4.0 μ m.
2, preliminary fine grinding: the magnetic after corase grind is added hydromining carry out preliminary fine grinding 4hr with ball mill.
3, secondary formula: the Zinc Stearate of 0.2wt% in the magnetic after preliminary fine grinding.
4, secondary fine grinding: with the further fine grinding 4hr of magnetic, then add the camphor of 1wt% and the 0.2wt% aluminum silicate fiber that average aspect ratio is 6000:1, continue ball milling about 30 minutes, 100 mesh sieves are crossed in discharging, and the magnetic mean particle size is 0.8 μ m.
5, discharging drainage: with secondary fine grinding slurry dewatering to water content at 38wt%.
6, drymagnetic shaping: the slip of dehydration is added the compression moulding of alignment magnetic field 0.5T dry method, obtain green compact.
7, finished product sintering: green compact are placed on sintering on pushed bat kiln, and sintering temperature is 1250 ℃, is incubated 120 minutes.
8, test its ultimate compression strength as shown in table 1.
Example 2:
1, adopt dry ball to roughly grind 3hr to the strontium permanent ferrite prefiring material of buying, 100 mesh sieves are crossed in discharging, and the magnetic mean particle size is 3.5 μ m.
2, preliminary fine grinding: the magnetic after corase grind is added hydromining carry out preliminary fine grinding 4hr with ball mill.
3, secondary formula: the Zinc Stearate of 0.4wt% in the magnetic after preliminary fine grinding.
4, secondary fine grinding: with the further fine grinding 4hr of magnetic, then add the camphor of 1wt% and 0.6wt% aluminum silicate fiber that average aspect ratio is 1000:1 to continue ball milling about 30 minutes, discharging 100 mesh sieves, the magnetic mean particle size is 0.8 μ m.
5, discharging drainage: with secondary fine grinding slurry dewatering to water content at 35wt%.
6, drymagnetic shaping: the slip of dehydration is added the compression moulding of alignment magnetic field 0.5T dry method, obtain green compact.
7, finished product sintering: green compact are placed on sintering on pushed bat kiln, and sintering temperature is 1250 ℃, is incubated 120 minutes.
8, test its ultimate compression strength as shown in table 1.
Two, reference examples:
1, adopt dry ball to roughly grind 2hr to the strontium permanent ferrite prefiring material of buying, 100 mesh sieves are crossed in discharging, and the magnetic mean particle size is 4.0 μ m.
2, preliminary fine grinding: the magnetic after corase grind is added hydromining carry out preliminary fine grinding 4hr with ball mill.
3, secondary formula: the Zinc Stearate of 0.2wt% in the magnetic after preliminary fine grinding.
4, secondary fine grinding: with the further fine grinding 4hr of magnetic, then add the camphor of 1wt% to continue ball milling about 30 minutes, discharging 100 mesh sieves, the magnetic mean particle size is 0.8 μ m.
5, discharging drainage: with secondary fine grinding slurry dewatering to water content at 38wt%.
6, drymagnetic shaping: the slip of dehydration is added the compression moulding of alignment magnetic field 0.5T dry method, obtain green compact.
7, finished product sintering: green compact are placed on sintering on pushed bat kiln, and sintering temperature is 1250 ℃, is incubated 120 minutes.
8, test its ultimate compression strength as shown in table 1.
Table 1 application result comparison sheet of the present invention
| Sequence number | Classification | Ultimate compression strength (MPa) |
| 1 | The reference examples sample | 853 |
| 2 | Embodiment 1 sample | 1088 |
| 3 | Embodiment 2 samples | 1205 |
Three, sum up:
According to above embodiment, adding average aspect ratio in permanent magnetic ferrite magnetic powder is the 0.2wt% aluminum silicate fiber of 6000:1, and the ultimate compression strength raising of making magnet is about 235MPa; Adding average aspect ratio is the 0.4wt% aluminum silicate fiber of 1000:1, and the ultimate compression strength raising of making magnet is about 352MPa.Can find out, the purpose that improves magnet ultimate compression strength has been played in the interpolation of aluminum silicate fiber, and this has important effect for the application performance that improves permanent-magnet ferrite.
The present invention is applicable to the production of annular and tile-type magnet steel.
Claims (4)
1. the preparation method of a fiber reinforcement type permanent-magnet ferrite is characterized in that comprising the following steps:
1) corase grind: adopt dry ball that the strontium permanent ferrite prefiring material is roughly ground, obtaining particle diameter is the thick magnetic powder of 3～5 μ m;
2) preliminary fine grinding: add water in the thick magnetic powder after corase grind, adopt ball mill to carry out preliminary fine grinding, obtain thin magnetic powder;
3) add Zinc Stearate, carry out the secondary fine grinding: add the Zinc Stearate that to account for thin magnetic powder total weight percent be 0.2～0.4 % in thin magnetic powder, after fine grinding 4～6 hr, then camphorate and aluminum silicate fiber, continue ball milling, obtain the slip that the magnetic mean particle size is 0.7～0.8 μ m;
4) discharging drainage: slurry dewatering to the water content of secondary fine grinding is accounted for 30～40% of slip total mass;
5) moulding: get the slip after dehydration, add alignment magnetic field 0.5T, through the dry-pressing compacting, form green compact;
6) sintering: it is to process 100～150 minutes in the sintering oven of 1230～1260 ℃ that green compact are placed on sintering temperature.
2. the preparation method of fiber reinforcement type permanent-magnet ferrite according to claim 1, the L/D ratio that it is characterized in that described aluminum silicate fiber is 1000～6000 ︰ 1.
3. the preparation method of described fiber reinforcement type permanent-magnet ferrite according to claim 1 and 2, is characterized in that the add-on of described thin magnetic powder accounts for 0.2～0.6% of thin magnetic powder gross weight.
4. the preparation method of fiber reinforcement type permanent-magnet ferrite according to claim 1, is characterized in that the add-on of described camphor accounts for 1% of thin magnetic powder gross weight.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023236527A1 (en) * | 2022-06-06 | 2023-12-14 | 横店集团东磁股份有限公司 | Preparation method for improving compression strength of permanent magnetic ferrite arc magnet |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101202138A (en) * | 2007-09-30 | 2008-06-18 | 常州迪迩磁性材料有限公司 | Permanent ferrite magnetic tile and preparation method thereof |
| 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 |
| CN101615464A (en) * | 2009-05-18 | 2009-12-30 | 浙江凯文磁钢有限公司 | Permanent magnet ferrite material with high breaking strength |
| 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 |
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- 2013-03-08 CN CN2013100751557A patent/CN103102169A/en active Pending
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 sintered permanent magnetic ferrite formed by dry pressing |
| CN101202138A (en) * | 2007-09-30 | 2008-06-18 | 常州迪迩磁性材料有限公司 | Permanent ferrite magnetic tile and preparation method thereof |
| CN101615464A (en) * | 2009-05-18 | 2009-12-30 | 浙江凯文磁钢有限公司 | Permanent magnet ferrite material with high breaking strength |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023236527A1 (en) * | 2022-06-06 | 2023-12-14 | 横店集团东磁股份有限公司 | Preparation method for improving compression strength of permanent magnetic ferrite arc magnet |
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Application publication date: 20130515 |