CN1861545A - Mn-Zn ferrite material and its production tech. - Google Patents
Mn-Zn ferrite material and its production tech. Download PDFInfo
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- CN1861545A CN1861545A CN 200510060363 CN200510060363A CN1861545A CN 1861545 A CN1861545 A CN 1861545A CN 200510060363 CN200510060363 CN 200510060363 CN 200510060363 A CN200510060363 A CN 200510060363A CN 1861545 A CN1861545 A CN 1861545A
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Abstract
A Mn-Zn ferrite with low power consumption and high saturated magnetic flux density is prepared from iron oxide, zinc oxide, manganese oxide, calcium oxide, niobium oxide and titanium oxide through proportional mixing, ball grinding, vibration grinding, pre-calcining, sand grinding, granulating, shaping, sintering and grinding.
Description
Technical field
The present invention relates to the Ferrite Material technical field, relate in particular to the Mn-Zn Ferrite Material and the production technique thereof of a kind of reduce power consumption, high saturated magnetic induction.
Background technology
Along with scientific technological advance, people's life class improves, automobile and computer use more and more frequent, have car family also in rapid rising, core material demand as automobile car transformer loop product is very big, require simultaneously also to improve gradually,, just require under hot conditions, also will keep very high saturation magnetic flux density in order to make it under severe temperatures conditions such as extraneous temperature Change and engine room heating, also to work.Equally, in order under the height heating temperature condition of liquid-crystal display, to use, also require under hot conditions, also will keep very high saturation magnetic flux density.And if the used loop product of common electrical and electronic product uses the core material with high saturation magnetic flux density, the decline of the saturation magnetic flux density that causes because of conditions such as spontaneous heatings of may command too, and can realize the miniaturization Design of coil.This type of developing material has been noted by top in recent years company.As the Japanese FDK announcement newest fruits 4H45 of company in 2003, just has this type of good characteristic.
It is crucial that the trace element that the MnZn ferrite is suitable mixes.Have in the prior art repeatedly the introduction of doped with trace elements in the MnZn ferrite is reported, as the MnZn Ferrite Material of being narrated in the Chinese patent application 00126065.0, though the power consumption under 100 ℃ can drop to 300kW/m
3Below, but in manufacturing process, increased desulfurization process.So just increased production cost and more strict to raw-material requirement.And in ancillary component, added SiO
2The MnZn Ferrite Material that Chinese patent application 03115906.0 is narrated, the Bs under 25 ℃ reaches 520mT, but 100 ℃ Pcv is at 370kW/m
3About, the power consumption numerical value under 45～55 ℃ not.In addition, owing to added SiO
2As ancillary component.The MnZn Ferrite Material of being narrated in the Chinese patent application 02137639.5, Pcv≤400kW/m
3Such power consumption still is higher.In addition, also added SiO
2As ancillary component.The MnZn Ferrite Material that Chinese patent application 03125523.x narrated, the Pcv under 100 ℃ is at 280kW/m
3About, but undeclared Bs and μ
iEtc. the characteristic of magnetic parameter, only be low Pcv, can't satisfy the requirement of miniaturization of devices.Miniaturization of devices requires the Bs height, and Pcv is low, and both satisfy simultaneously.In addition, also added SiO
2, HfO
2As ancillary component.The material that Chinese patent application 01112082.7 is narrated is though Pcv can be at 230～260kW/m
3Between, but Bs and μ are not described
ICharacteristic etc. the magnetic parameter.Only the reduction of a Pcv, and do not consider Bs and μ
IEtc. the magnetic parameter miniaturization of devices and high-level efficiency there is not too big help.In addition, in this patent interpolation SiO has been described also
2As minor component.The MnZn power ferrite material of being narrated in the patent of Chinese patent application 00126353.6 is the lower material of loss under a kind of wide temperature, at position, valley point Pcv＜350kW/m
3. for such loss value, this patent has also been added SiO in ferrite
2As minor component.MnZn Ferrite Material among the Chinese patent application 99101345.x, Pcv≤260kW/m of its 50 ℃～70 ℃
3, also added SiO in the ferrite
2As minor component.
Chinese patent application 93114870.7 has been narrated by a kind of sintered compact has been finish grinded the method that magnetic parameters such as making magnetic permeability and Bs improves, but fail to reach the ideal index eventually, and, reduced production efficiency owing to finish grind to such an extent that the time has also increased production cost than long.The MnZn ferrite that Chinese patent application 02138280.8 is narrated is though under 100 ℃ of conditions, Pcv drops to 240～260kW/m
3, 100 ℃ Bs reaches 410～430mT, but in this invention owing to added nano level Nb
2O
5, Ta
2O
5, ZrO
2, SnO
2, TiO
2, ancillary component such as CaO and increased whole cost.This causes realizing that large-scale industrial production becomes difficulty, and this ferritic use generalization of restriction.Though the flat 2003-306376A of Japanese patent application TOHKEMY discloses forming constituent class seemingly with the present invention on the moiety, wherein contains the ZnO of higher proportion, cause this ferritic high temperature to use character not satisfy the demand.
Therefore at present still need to seek a kind of new stable power output that under the pyritous environment, keeps, and have the MnZn ferrite that the character of low watt consumption and high saturation magnetic flux density needs.
Summary of the invention
The present invention is by to after adulterated trace element carries out the screening of various combination in the ferrite, finds that principal constituent in ferrite in certain proportional range, avoids adding SiO unexpectedly
2As adulterated ancillary component, obtained unforeseeable effect after the specific selection of the ferrite ancillary component that selection is commonly used and the cooperation.Realize under the pyritous environment power output that keeps stable, and had the MnZn ferrite that the character of low watt consumption and high saturation magnetic flux density needs.
The invention provides a kind of MnZn ferrite, its principal phase is a spinel structure, comprises principal constituent and minor component, and described principal constituent and content are calculated as with oxide compound:
Fe
2O
3Be 50～60mol%,
ZnO is 5.0～15.0mol%,
All the other are MnO;
Described minor component is by CaO, Nb
2O
5And TiO
2Form, its weight percent content is expressed as follows with oxide form: CaO:300～900ppm, Nb
2O
5: 50～500ppm, TiO
2: 50～2500ppm.Principal constituent and content are calculated as with oxide compound preferably:
Fe
2O
3Be 53～55mol%,
ZnO is 5.0～7.0mol%,
All the other are MnO;
Described minor component weight percent content is expressed as follows with oxide form: CaO:500～700ppm, Nb
2O
5: 100～300ppm, TiO
2: 100～2000ppm.Better principal constituent and content are calculated as with oxide compound:
Fe
2O
3Be 53.66～53.8mol%,
ZnO is 6.0～6.1mol%,
MnO is 40.10～40.34mol%;
Described minor component weight percent content is expressed as follows with oxide form: CaO:500～700ppm, Nb
2O
5200ppm, TiO
2400～1500ppm.
The present invention specifically provides a kind of Mn-Zn Ferrite Material, and principal constituent and content are calculated as with oxide compound:
Fe
2O
3Be 53.8mol%,
ZnO is 6.10mol%,
MnO is 40.10mol%;
The minor component weight percent content is expressed as follows with oxide form: CaO:500ppm, Nb
2O
5200ppm, TiO
2400ppm.
The present invention also specifically provides a kind of Mn-Zn Ferrite Material, and principal constituent and content are calculated as with oxide compound:
Fe
2O
3Be 53.66mol%,
ZnO is 6.0mol%,
MnO is 40.34mol%;
The minor component weight percent content is expressed as follows with oxide form: CaO700ppm, Nb
2O
5200ppm, TiO
21500ppm; In the prior art usually SiO
2As the ancillary component that generally contains in the MnZn ferrite, ferritic character is played an important role, in ferrite, all exist usually as a kind of main ancillary component.The inventor finds when avoiding adding SiO
2Be ancillary component, and adjust the kind of other ancillary components and the selection of consumption, can realize that the ferrite that has in certain principal constituent proportional range has extraordinary character---under normal temperature and high temperature, all have high Bs and stable power output, and under high frequency, have more low-loss soft magnetic ferrite, adapted to of the requirement of different operating environment material; Do not add SiO2 in the present invention in addition, for satisfying 100 ℃ of Bs and 100 ℃ of this situations of Pcv simultaneously, the SiO2 of Tian Jiaing can not reduce Pcv in addition, but causes the discontinuous growth of crystal grain on the contrary easily, causes Pcv to raise.
Selecting suitable main formula also quite crucial, too high ZnO content can cause Bs to descend, and particularly 100 ℃ of BS declines are more obvious, and low excessively ZnO content but is difficult to guarantee 100 ℃ of low Pcv.
Therefore, the present invention does not add the important key element that the main formula of extra SiO2 and selection is the realization of this kind of assurance material property.
Therefore Mn-Zn Ferrite Material provided by the present invention, magnetic permeability is that 2000 ± 25%, 25 ℃ of Bs can reach 535mT, and 100 ℃ of Bs can reach 450mT, and it is at 100kHz, and 25 ℃ of Pcv values are less than 750mw/cm during 200mT
3, 60 ℃ less than 520mw/cm
3, 80 ℃ less than 470mw/cm
3, 100 ℃ less than 450mw/cm
3, 120 ℃ less than 650mw/cm
3, its Curie temperature can reach 280 ℃ simultaneously.This novel Mn-Zn ferrite has possessed reduce power consumption, this good performance of high saturated magnetic induction, and the device power consumption of its preparation is little, volume is little, also can keep stable power output under hot environment.
The application provides a kind of production technique of Mn-Zn Ferrite Material on the other hand, it is characterized in that the processing step that adopts is: batching, ball milling, vibration, pre-burning, sand milling, granulation, moulding, sintering, mill processing, in burn in step, adopt air kiln directly powder to be carried out pre-burning, temperature is 950-1050 ℃, and the time is 1～3h; Adopt sintering oven to carry out in sintering step, and use nitrogen protective sintering, sintering temperature is 1280-1360 ℃, and sintering time is 3～5h, cools off in balanced atmosphere then.The concrete production craft step of the Mn-Zn Ferrite Material of preferred described reduce power consumption, high saturated magnetic induction is as follows:
(1) ball milling: mix by force with V-arrangement blender dry type, the time of batch mixing is 0.5～1h;
(2) vibration: adopt the vibrating ball mill vibration, the vibration time is 0.5～0.7h;
(3) pre-burning: adopt air kiln directly powder to be carried out pre-burning, temperature is 950-1050 ℃, and the time is 1～3 hour;
(4) sand milling: the powder mean particle size behind sand milling is 1.0～1.2 μ m;
(5) granulation: adopt tablets press to carry out granulation, 270 ℃ of temperature ins, 130 ℃ of temperature outs;
(6) moulding: green density is controlled at 3.0g/cm
3
(7) sintering: adopt sintering oven to carry out, and use N
2Gas shiled sintering, sintering temperature are 1280～1360 ℃: sintering time is 3～5h, cools off in balanced atmosphere then;
(8) mill processing: surfaceness reaches Ra=0.2～1.4 μ m.
Because each component of Mn-Zn Ferrite Material of reduce power consumption of the present invention, high saturated magnetic induction is reasonable in the weight percentage ranges of oxide compound, and adopt the production technique of batching, ball milling, vibration, pre-burning, sand milling, granulation, moulding, sintering, mill processing and packing, be fit to industrialized mass production, its production cost is low, process stabilizing, product have the magnetic permeability height, high saturated magnetic induction, high curie point, specific hysteresis losses coefficient are low, more less than temperature factor, etc. characteristics.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described; But the present invention is not limited to these
Embodiment
Embodiment 1
(1) batching: ferric oxide (Fe
2O
3) be 53.80mol%, manganese oxide (MnO) is 40.10mol%, zinc oxide (ZnO) is 6.10mol%.Minor component adds following oxide compound: CaO:500ppm, Nb by weight percentage
2O
5: 200ppm, TiO
2: 400ppm.
(2) ball milling: mix by force with V-arrangement blender dry type, the time of batch mixing is 0.7h;
(3) vibration: adopt the vibrating ball mill vibration, the vibration time is 0.6h;
(4) pre-burning: adopt air kiln directly powder to be carried out pre-burning, temperature is 950 ℃, and the time is 2.5h;
(5) sand milling: adopt circulating sand mill to carry out sand milling, the sand milling time is 2.5h; Material: ball: water=1: 1: 0.60; Powder mean particle size behind sand milling is 1.0～1.2 μ m;
(6) granulation: adopt tablets press to carry out granulation, 270 ℃ of temperature ins, 130 ℃ of temperature outs;
(7) moulding: adopt the full-automatic dry press to carry out, φ 25 sample ring green density are controlled at 3.0g/cm
3, tolerance of dimension is controlled at ± 0.1mm;
(8) sintering: adopt sintering oven to carry out, and use N
2Gas shiled sintering, sintering temperature are 1280～1360 ℃: sintering time is 3～5h, cools off in balanced atmosphere then.
Preparation is not added magnetic permeability, the Curie temperature of the sample ring of SiO2, the saturation induction density Bs of MATS-2000 test material, the Pcv of SY-8232 test material with the HP4291A test material.The test result of its magnetic permeability, power consumption Pcv, saturation induction density Bs, Curie temperature is as shown in the table:
Table 1
| μ i | Bs 25℃ | Bs 100℃ | Tc ℃ | Pcv(kW/m 3)100kHz 200mT | |||||
| 25℃ | 60℃ | 80℃ | 100℃ | 120℃ | |||||
| 1 | 2138 | 535 | 451 | 282 | 739 | 430 | 323 | 365 | 648 |
Can see that from table 1 the magnetic permeability height can reach 2138, normal temperature Bs can reach 535mT, and high temperature Bs can reach 451mT, and it is at 100kHz, 25 ℃ of 739mw/cm of Pcv value during 200mT
3, 60 ℃ of 439mw/cm
3, 80 ℃ of 323mw/cm
3, 100 ℃ of 365mw/cm
3, 120 ℃ of 648mw/cm
3, Curie temperature can reach 282 ℃, illustrates that this material has characteristics such as reduce power consumption, high saturated magnetic induction, high curie point.
Sintering adds the sample ring batching of 200ppmSiO2 simultaneously: ferric oxide (Fe
2O
3) be 53.80mol%, manganese oxide (MnO) is 40.10mol%, zinc oxide (ZnO) is 6.10mol%.Minor component adds following oxide compound: CaO:500ppm, Nb by weight percentage
2O
5: 200ppm, TiO
2: 400ppm, SiO2:200ppm.
Preparation is added magnetic permeability, the Curie temperature of the sample ring of 200ppm SiO2, the saturation induction density Bs of MATS-2000 test material, the Pcv of SY-8232 test material with the HP4291A test material.The test result of its magnetic permeability, power consumption Pcv, saturation induction density Bs, Curie temperature is as shown in the table:
Table 2
| μ i | Bs 25℃ | Bs 100℃ | Tc ℃ | Pcv(kW/m 3)100kHz 200mT | |||||
| 25℃ | 60℃ | 80℃ | 100℃ | 120℃ | |||||
| 1 | 1988 | 528 | 447 | 281 | 1052 | 723 | 557 | 672 | 921 |
From table data as can be seen, though added Bs behind the 200ppm SiO2, Tc changes little, the Pcv of each temperature spot increases considerably, and μ
iDescend to some extent, this moment, material did not possess low in power consumption yet.
Embodiment 2
(1) batching: ferric oxide (Fe
2O
3) be 53.66mol%, manganese oxide (MnO) is 40.34mol%, zinc oxide (ZnO) is 6.0mol%.Minor component adds following oxide compound: CaO:700ppm, Nb by weight percentage
2O
5: 200ppm, TiO
2: 1500ppm.
(2) ball milling: mix by force with V-arrangement blender dry type, the time of batch mixing is 0.7h;
(3) vibration: adopt the vibrating ball mill vibration, the vibration time is 0.6h;
(4) pre-burning: adopt air kiln directly powder to be carried out pre-burning, temperature is 950 ℃, and the time is 2.5h;
(5) sand milling: adopt circulating sand mill to carry out sand milling, the sand milling time is 2.5h; Material: ball: water=1: 1: 0.60; Powder mean particle size behind sand milling is 1.0～1.2 μ m;
(6) granulation: adopt tablets press to carry out granulation, 270 ℃ of temperature ins, 130 ℃ of temperature outs;
(7) moulding: adopt the full-automatic dry press to carry out, φ 25 sample ring green density are controlled at 3.0g/cm
3, tolerance of dimension is controlled at ± 0.1mm;
(8) sintering: adopt sintering oven to carry out, and use N
2Gas shiled sintering, sintering temperature are 1280～1360 ℃: sintering time is 3～5h, cools off in balanced atmosphere then.
With the sample ring for preparing magnetic permeability, Curie temperature, the saturation induction density Bs of MATS-2000 test material, the Pcv of SY-8232 test material with the HP4291A test material.The test result of its magnetic permeability, power consumption Pcv, saturation induction density Bs, Curie temperature is as shown in table 3 below:
Table 3
| μ i | Bs 25℃ | Bs 100℃ | Tc ℃ | Pcv(kW/m 3)100kHz 200mT | |||||
| 25℃ | 60℃ | 80℃ | 100℃ | 120℃ | |||||
| 1 | 2025 | 532 | 452 | 281 | 741 | 430 | 308 | 362 | 635 |
Can see that from table 3 magnetic permeability can reach 2025, normal temperature Bs can reach 532mT, high temperature Bs can reach 452mT, and it is at 100kHz, 25 ℃ of 741mw/cm of Pcv value during 200mT
3, 60 ℃ of 430mw/cm
3, 80 ℃ of 308mw/cm
3, 100 ℃ of 362mw/cm
3, 635 ℃ of 635mw/cm
3, Curie temperature can reach 281 ℃, illustrates that this material has characteristics such as reduce power consumption, high saturated magnetic induction, high curie point.
The sintering ZnO content is the sample ring batching of 16mol% simultaneously: ferric oxide (Fe
2O
3) be 52.86mol%, manganese oxide (MnO) is 31.14mol%, zinc oxide (ZnO) is 16.0mol%.Minor component adds following oxide compound: CaO:700ppm, Nb by weight percentage
2O
5: 200ppm, TiO
2: 1500ppm
With the sample ring of preparation magnetic permeability, Curie temperature, the saturation induction density Bs of MATS-2000 test material, the Pcv of SY-8232 test material with the HP4291A test material.The test result of its magnetic permeability, power consumption Pcv, saturation induction density Bs, Curie temperature is as shown in table 4 below:
Table 4
| μ i | Bs 25℃ | Bs 100℃ | Tc ℃ | Pcv(kW/m 3)100kHz 200mT | |||||
| 25℃ | 60℃ | 80℃ | 100℃ | 120℃ | |||||
| 1 | 2422 | 522 | 412 | 222 | 583 | 398 | 304 | 311 | 398 |
From table 4 data as can be seen, though when main formula drop on of the present invention extraneous the time Pcv of each temperature spot decline is all arranged, and μ
iAlso rise to some extent, but Bs, particularly 100 ℃ descend religion obviously, and Tc also reduces.This moment, material did not possess the characteristics of high saturated magnetic induction, high curie point.
The sintering ZnO content is the sample ring batching of 3mol% simultaneously in addition: ferric oxide (Fe
2O
3) be 54.02mol%, manganese oxide (MnO) is 42.98mol%, zinc oxide (ZnO) is 3mol%.Minor component adds following oxide compound: CaO:700ppm, Nb by weight percentage
2O
5: 200ppm, TiO
2: 1500ppm.
With the sample ring of preparation magnetic permeability, Curie temperature, the saturation induction density Bs of MATS-2000 test material, the Pcv of SY-8232 test material with the HP4291A test material.The test result of its magnetic permeability, power consumption Pcv, saturation induction density Bs, Curie temperature is as shown in table 5 below:
Table 5
| μ i | Bs 25℃ | Bs 100℃ | Tc ℃ | Pcv(kW/m 3)100kHz 200mT | |||||
| 25℃ | 60℃ | 80℃ | 100℃ | 120℃ | |||||
| 1 | 1722 | 508 | 452 | 298 | 1078 | 672 | 422 | 534 | 784 |
From table 5 data as can be seen, the Pcv that drops on each temperature spot of extraneous when time of the present invention when main formula has rising, and μ
iAlso descend to some extent, 25 ℃ of Bs descend, and 100 ℃ of BS are constant substantially, and Tc rises to some extent.This moment, material did not possess low in power consumption.
Claims (11)
1. Mn-Zn Ferrite Material, its principal phase is a spinel structure, comprises principal constituent and minor component, described principal constituent and content are calculated as with oxide compound:
Fe
2O
3Be 50～60mol%,
ZnO is 5.0～15.0mol%,
All the other are MnO;
Described minor component is by CaO, Nb
2O
5And TiO
2Form, its weight percent content is expressed as follows with oxide form: CaO:300～900ppm, Nb
2O
5: 50～500ppm, TiO
2: 50～2500ppm.
2. a kind of Mn-Zn Ferrite Material according to claim 1, it is characterized in that: described principal constituent and content are calculated as with oxide compound:
Fe
2O
3Be 53～55mol%,
ZnO is 5.0～7.0mol%,
All the other are MnO;
Described minor component weight percent content is expressed as follows with oxide form: CaO:500～700ppm, Nb
2O
5: 100～300ppm, TiO
2: 100～2000ppm.
3. a kind of Mn-Zn Ferrite Material according to claim 1, it is characterized in that: described principal constituent and content are calculated as with oxide compound:
Fe
2O
3Be 53.66～53.8mol%,
ZnO is 6.0～6.1mol%,
MnO is 40.10～40.34mol%;
Described minor component weight percent content is expressed as follows with oxide form: CaO:500～700ppm, Nb
2O
5200ppm, TiO
2400～1500ppm.
4. a kind of Mn-Zn Ferrite Material according to claim 3, it is characterized in that: described principal constituent and content are calculated as with oxide compound:
Fe
2O
3Be 53.8mol%,
ZnO is 6.10mol%,
MnO is 40.10mol%;
Described minor component weight percent content is expressed as follows with oxide form: CaO:500ppm, Nb
2O
5200ppm, TiO
2400ppm.
5. a kind of Mn-Zn Ferrite Material according to claim 3, it is characterized in that: described principal constituent and content are calculated as with oxide compound:
Fe
2O
3Be 53.66mol%,
ZnO is 6.0mol%,
MnO is 40.34mol%;
Described minor component weight percent content is expressed as follows with oxide form: CaO700ppm, Nb
2O
5200ppm, TiO
21500ppm.
6. production technique as a kind of Mn-Zn Ferrite Material as described among the claim 1-5 any, it is characterized in that the processing step that adopts is: batching, ball milling, vibration, pre-burning, sand milling, granulation, moulding, sintering, mill processing, in burn in step, adopt air kiln directly powder to be carried out pre-burning, temperature is 950-1050 ℃, and the time is 1～3h; Adopt sintering oven to carry out in sintering step, and use nitrogen protective sintering, sintering temperature is 1280-1360 ℃, and sintering time is 3～5h, cools off in balanced atmosphere then.
7. a kind of Mn-Zn ferrite material material manufacturing technique according to claim 6 is characterized in that ball milling mixes by force with V-arrangement blender dry type in the described step, and the time of batch mixing is 0.5～1h.
8. a kind of Mn-Zn ferrite material material manufacturing technique according to claim 6 is characterized in that the vibrating ball mill vibration is adopted in vibration in the described step, and the vibration time is 0.5～0.7h.
9. a kind of Mn-Zn ferrite material material manufacturing technique according to claim 6 is characterized in that the powder mean particle size after the sand milling operation is 1.0～1.2 μ m in the described step.
10. a kind of Mn-Zn ferrite material material manufacturing technique according to claim 6 is characterized in that in the described step that green density is controlled at 3.0g/cm after the moulding
3
11. a kind of Mn-Zn ferrite material material manufacturing technique according to claim 6 is characterized in that mill processing adopts grinding machine to process in the described step, surfaceness reaches Ra=0.2～1.4 μ m.
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| CN101231902B (en) * | 2007-09-25 | 2010-06-16 | 横店集团东磁股份有限公司 | Mn-Zn ferrite magnetic material with high magnetoconductivity and high impedance and method for making the same |
| CN101404197B (en) * | 2008-07-14 | 2011-12-07 | 广东风华高新科技股份有限公司 | Manganese zinc soft magnetic ferrite and production method for its magnetic core |
| CN102531637A (en) * | 2010-12-22 | 2012-07-04 | 上海宝钢磁业有限公司 | Dry process for manufacturing high performance soft ferrite powder |
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| JPH07142224A (en) * | 1993-11-16 | 1995-06-02 | Kawasaki Steel Corp | Low-iron-loss mn-zn soft ferrite |
| EP0707323B1 (en) * | 1994-04-27 | 2001-10-10 | TDK Corporation | Ferrite and ferrite core for switching power source |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101231902B (en) * | 2007-09-25 | 2010-06-16 | 横店集团东磁股份有限公司 | Mn-Zn ferrite magnetic material with high magnetoconductivity and high impedance and method for making the same |
| CN101404197B (en) * | 2008-07-14 | 2011-12-07 | 广东风华高新科技股份有限公司 | Manganese zinc soft magnetic ferrite and production method for its magnetic core |
| CN102531637A (en) * | 2010-12-22 | 2012-07-04 | 上海宝钢磁业有限公司 | Dry process for manufacturing high performance soft ferrite powder |
| CN102531637B (en) * | 2010-12-22 | 2015-05-20 | 上海宝钢磁业有限公司 | Dry process for manufacturing high performance soft ferrite powder |
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