CN102674821A - Method for preparing Mn-Zn soft magnetic power ferrite core material - Google Patents
Method for preparing Mn-Zn soft magnetic power ferrite core material Download PDFInfo
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Abstract
The invention relates to a method for preparing a Mn-Zn soft magnetic power ferrite core material. The method comprises the following specific implementation process flows of: weighing, mixing, tableting, presintering, crushing, sanding, pulping, spray granulation, pressing and sintering. Compared with the prior art, the method for preparing the Mn-Zn soft magnetic power ferrite core material has the advantages that the heat productivity is reduced, and miniaturization and thinning are realized. Moreover, the Mn-Zn soft magnetic power ferrite core material has high saturation flux density (Bs) and low power loss.
Description
Technical field
The invention belongs to the oxidate magnetic material technical field, especially relate to the method that a kind of making has the MnZn soft magnetism power ferrite magnetic core of high saturated magnetic induction (Bs), low-power consumption.
Background technology
In recent years, digital household appliances is universal day by day, and complete machine develops to miniaturized, lightweight direction fast, and especially flat panel TV framework slimming trend is more remarkable.In this case, the essential miniaturized of power source circuit part, slimming.As one of its solution, give full play to had develop a whole set of technology of application project from starting material, develop novel transformer, realized miniaturized, the slimming of power transformer product.And power ferrite is a kind of soft magnetic materials that early is used for supply transformer; Complete electronic set is frivolous to switch power supply in order to adapt to, the requirement of miniaturized; Material should develop to the high-frequency low-consumption direction, and device should be to small-sized, light weight, efficient and surface mounting technique development.Simultaneously; Along with consumer product develops to digitizing and high-performance; The magneticsubstance product is had higher requirement; Like power source circuit, switch power supply, notebook computer adapter and the CCFL LCD back lighting of high-resolution, digital color TV, flat panel TV, just power loss, magnetic permeability, the frequency of utilization to soft magnetic ferrite proposed the requirement higher than analog machine.In addition; Digital camera-recorder, stereo set, convertible frequency air-conditioner; And the high speed development in field such as domestic computingmachine, office automation product, communication equipment; For element rush of demands such as switch power supply, X-former, wave filter, power choke coil, anti-EMI, wide band transformer, pulse transformers, these all are the important applied field of high-grade soft magnetic ferrite.This year, international transregional company was attracted by the huge market of China, tried to be the first to get into China, and supporting localization requires strongly for components and parts, and this has also brought great demand for China's soft magnetic ferrite industry.Ferrite renowned companies such as present Japanese TDK, FDK, Tokyo ferrite, Kawasaki Steel, Siemens, Dutch Philip begun to produce in enormous quantities the third generations such as PC40, PC44, PC47, four generation high-frequency power ferrite material, its frequency of utilization generally can reach hundreds of KHz-1MHz.But and domesticly have only the small serial production PC40 of minority enterprise material, the product of PC44, the PC47 trade mark is not domesticly also produced in batches.For miniaturized and the microminiaturized development trend of complying with electron device; And the product specification of company brought up to level more; Realize scale prodn, enlarge the occupation rate of product, increase foreign exchange earnings from exports in the world market; Improve the foundation economic benefit, the requirement of magnetic product is very important to adapt to market.
The present invention adopts unique processing technology routine and atmosphere sintering control techniques; Through adjustment material prescription and doping, be applicable to the soft magnetic MnZn ferrite materials such as power source circuit, switch power supply, notebook computer adapter and CCFL LCD back lighting of flat panel TV.
Summary of the invention
The object of the invention is exactly the method that the MnZn soft magnetism power ferrite core material of a kind of making high saturated magnetic induction (Bs), low-power consumption is provided for the defective that overcomes above-mentioned prior art existence.
The object of the invention can be realized through following technical scheme:
A kind of method of making MnZn soft magnetism power ferrite core material may further comprise the steps:
(1) mixed: accurately take by weighing the raw material of main composition by proportioning, adopt that strong to mix machine mixed, the mixed time of control is 2 hours, and the powder particle size after mixed is controlled at 0.8 ~ 1.0 μ m, makes raw material evenly mixed, when being beneficial to pre-burning at the beginning of single-step solid phase reaction complete;
(2) compressing tablet: the powder after will mixing drops into the powder tabletting machine, is pressed into the scutellate particle powder of certain intensity;
(3) pre-burning: above-mentioned scutellate particle powder is dropped into the rotary kiln pre-burning; Calcined temperature is at 700 ~ 800 ℃; The pre-burning time is 80 ~ 120 minutes, and the mixed powder flow of control is 4 ~ 6 kg/minute, and the rotary kiln rotating speed is 5 ~ 20 rev/mins; Make red mixed powder that solid state reaction tentatively take place, be transformed into black by redness;
(4) coarse reduction: the miscellany of above-mentioned black is carried out coarse reduction, adopt vibromill, the pulverizing time is 60 ~ 120 minutes, makes particle size dispersion even, and radius is littler, crosses 200 eye mesh screen percent of pass with water jetting and is controlled at more than 95%;
(5) sand milling: will carry out sand milling through the miscellany of the black of coarse reduction; Obtain the black powder of fine powder after broken, the whole sand milling time is 100 ~ 180 minutes, and blended stock relies on steel ball and powder particle in sand mill; Friction between powder particle and the powder particle; Percussion further reduces the particulate median size, dwindles the distribution range of its particle diameter, and the control size distribution is controlled at 0.8 ~ 1.0 μ m;
(6) slurrying: when sand grinding process finishes; Stirring more stirred its slip in 1-2 hour in the slurrying bucket, dropped into the solution and the skimmer of glue Z 150PH again, and total add-on of glue and skimmer is the miscellany 0.5 ~ 1wt% of black; The effect of glue is that it has very strong viscosity; Be convenient to the compression moulding of soft ferromagnetic powder, the foam that stirs generation when adding glue is eliminated in acting as of skimmer, prevents that the particle powder is hollow;
(7) spraying drying: through the slurry after the slurrying; The control inlet temperature is at 290 ℃ ~ 350 ℃; Temperature out under 80 ℃ ~ 110 ℃ through the mist projection granulating tower be sprayed into surface drying, middle moistening, have good fluidity and dispersed particle, be MnZn soft magnetism power ferrite core material.
Main composition described in the step (1) comprises following component and mole percent level: the zinc oxide of 55 ~ 60%mol red stone, 3 ~ 8%mol, the manganese oxide of 32 ~ 42%mol.
Main composition described in the step (1) again to wherein adding additive, is selected from Bi after mixing
2O
3, K
2CO
3, CaCO
3Or among the NiO three kinds or four kinds.
Total add-on of described additive is 400 ~ 10000ppm, and the addition of every kind of component is: 100 ~ 2500ppm.
Scutellate particle powder described in the step (3) again to wherein adding micro-additive, is selected from Nb after the process pre-burning
2O
5, NiO, Bi
2O
3, K
2CO
3Or CaCO
3In four kinds or five kinds.
Total add-on of described micro-additive is 500 ~ 5000ppm, and the addition of every kind of component is 100 ~ 1000ppm.
Sand milling can adopt wet pulverization, utilizes pure water as medium.In sand mill, drop into black powder, doping, pure water and the dispersion agent of the main composition of coarse reduction by a certain percentage.Dispersion agent black powder in company with the main composition of pre-burning when sand milling begins adds, and effect is to prevent that powder from reuniting, and is beneficial to improve sand milling efficient.The input ratio is: the black powder 50 ~ 70%wt of main composition, and pure water 30 ~ 50wt%, dispersion agent 0.5 ~ 1wt%, 0.5 ~ 1.0wt% mixes.
Compared with prior art, the present invention has the following advantages:
The first, reduce thermal value.Compare with general material, material of the present invention reduces loss 170kW/m approximately
2, only need to change magnetic core and can reduce temperature.To the very strictness of temperature rise regulation, long-term excessively intensification can make the metal generation of welded joint part aging to flat panel TV, causes performance to receive very big influence with power supply.The measure of this reduction heating can improve reliability of products, can also reduce CO2 emissions;
The second, realize miniaturized.Core loss has reduced by 40%, thus use magnetic core than traditional magneticflux-density high about 20%, its heating also can be controlled in equal or below.Pass through to enlarge the use range of magneticflux-density like this, but reduced cross-sectional is long-pending.For example, the weight ratio of EER35 and EER30 ~ EER32 can reduce 40%, reduces the wire rod usage quantity simultaneously.So both can save resource greatly, can also reduce copper loss simultaneously, in other words just improve power-efficient;
The 3rd, realize slimming.As previously mentioned, can reduced cross-sectional long-pending, mean under erection space and identical in the past situation, reduce the height of this part, realized the soft magnetic MnZn ferrite material of slimming.
Embodiment
Below in conjunction with specific embodiment the present invention is elaborated.
The practical implementation technical process is:
Weighing---mixes---compressing tablet---pre-burning---fragmentation---sand milling---slurrying---mist projection granulating---compacting---sintering
Embodiment 1
(1) mixed: principal constituent proportioning: 55-60%mol red stone (Fe
2O
3), the zinc oxide (ZnO) of 3-8%mol, 32-42%mol manganese oxide (MnO) accurately takes by weighing the raw material of above-mentioned main composition, is that radix adds micro-additive 1000ppm Bi by main composition gross weight then
2O
3, 200ppm K
2CO
3, 2500ppm NiO adopts that strong to mix machine evenly mixed, total mixed time is 2 hours.Powder particle size after mixed is controlled at about 0.8 ~ 1.0 μ m.
(2) compressing tablet:, be pressed into the scutellate particle of certain intensity with the special powder tabletting machine of powder input of above-mentioned mixed main composition.
(3) pre-burning: above-mentioned mixed powder is dropped into the rotary kiln pre-burning; Calcined temperature is at 700 ~ 800 ℃; The pre-burning time is 80 ~ 120 minutes, the mixed powder flow of control is about 5kg/minute, the rotary kiln rotating speed is 5 ~ 20 rev/mins; Make red mixed powder that solid state reaction tentatively take place, and make mixed powder be transformed into black by redness.
(4) coarse reduction: the black miscellany that pre-burning is obtained adopts vibromill to carry out coarse reduction, and the pulverizing time is 60 ~ 120 minutes, makes particle size dispersion even, and radius is littler, crosses 200 eye mesh screen percent of pass with water jetting and is controlled at more than 95%;
(5) sand milling: will carry out sand milling through the miscellany of coarse reduction, and obtain the black paste of fine powder after broken, the whole sand milling time is 100 ~ 180 minutes.The distribution of general particle diameter is controlled between 0.8 ~ 1.0 μ m.
In disintegrator, drop into black powder, pure water, dispersion agent and the micro-additive of meal; The input ratio is: black powder 50 ~ 70%wt, pure water 30 ~ 50%wt, dispersion agent 0.5 ~ 1%wt; Trace additive 0.05 ~ 0.5%wt, wherein micro-additive is respectively: 120ppm Nb
2O
5, 1000ppm NiO, 100ppm Bi
2O
3, 200ppmK
2CO
3, 500ppm CaCO
3
(6) slurrying: when sand grinding process finished, stirring more stirred its slip in 1-2 hour in the slurrying bucket, dropped into glue (solution of Z 150PH) and skimmer again, total add-on 0.5 ~ 1%wt of glue and skimmer;
(7) spraying drying: through the slurry after the slurrying, the control inlet temperature is at 290 ℃ ~ 350 ℃, temperature out under 80 ℃ ~ 110 ℃ through the mist projection granulating tower be sprayed into surface drying, middle moistening, have good fluidity and a dispersed particle.
(8) compacting: get and spray good particulate material and add a little Zinic stearas (particulate material: Zinic stearas=1:3), be pressed into ring blank sintering in the bell jar stove of φ 22 * 14 * 8 that stirs.
Embodiment 2 ~ 12
With step and the preparation method of embodiment 1, select for use the proportioning of different principal constituents and the addition of micro-additive (specifically as shown in table 1) to prepare sample respectively.
Comparative Examples 1 ~ 3
With step and the preparation method of embodiment 1, select the present invention to fill a prescription 1 ~ 12 respectively, conventional high B
SLow-loss comparative formula 1 ~ 3, the addition of concrete principal constituent proportioning and micro-additive is as shown in table 1, prepares sample respectively.
The proportioning and the micro-additive addition of principal constituent in table 1 embodiment 1 ~ 12 and the Comparative Examples 1 ~ 3
Be to test saturation induction density (Bs) and power loss value PCV under 25 ℃, 100 ℃ the condition in the test environment temperature.Adopt MATS-2010SP under the 1194A/m magnetic field condition, to test saturation induction density (Bs); Adopt JP2581 power consumption appearance in the 100KHz frequency, measured power loss value PCV (KW/m3) under the 200mT magnetic field condition adopts the LCZ1601 table to survey Tc, adopts drainage to survey density.Measured value table 2 is as showing:
Table 2 embodiment 1 ~ 12 contrasts with the key technical indexes of Comparative Examples 1 ~ 3
Embodiment 13
A kind of method of making MnZn soft magnetism power ferrite core material may further comprise the steps:
(1) mixed: prepare main composition, the zinc oxide of 55%mol red stone, 3%mol, the manganese oxide of 42%mol accurately takes by weighing the raw material of main composition by proportioning, adopts that strong to mix machine mixed, and the mixed time of control is 2 hours, then to wherein adding Bi
2O
3, K
2CO
3, CaCO
3, total add-on is 400ppm, the add-on of each component is respectively 100ppm, 100ppm, 200ppm, the powder particle size after mixed is controlled at 0.8 μ m, makes raw material evenly mixed, when being beneficial to pre-burning at the beginning of single-step solid phase reaction complete;
(2) compressing tablet: the powder after will mixing drops into the powder tabletting machine, is pressed into the scutellate particle powder of certain intensity;
(3) pre-burning: above-mentioned scutellate particle powder is dropped into the rotary kiln pre-burning; Calcined temperature is at 700 ℃, and the pre-burning time is 80 minutes, and the mixed powder flow of control is 4 kg/minute; The rotary kiln rotating speed is 5 rev/mins; Make red mixed powder that solid state reaction tentatively take place, be transformed into black by redness, and then to Nb wherein
2O
5, NiO, Bi
2O
3, K
2CO
3, total add-on is 500ppm, the addition of every kind of component is respectively 100ppm, 100ppm, 150ppm, 150ppm;
(4) coarse reduction: the miscellany of above-mentioned black is carried out coarse reduction, adopt vibromill, the pulverizing time is 60 minutes, makes particle size dispersion even, and radius is littler, crosses 200 eye mesh screen percent of pass with water jetting and is controlled at more than 95%;
(5) sand milling: will carry out sand milling through the miscellany of the black of coarse reduction, and obtain the black powder of fine powder after broken, the whole sand milling time is 100 minutes; Blended stock relies on steel ball and powder particle in sand mill, the friction between powder particle and the powder particle, and percussion further reduces the particulate median size; Dwindle the distribution range of its particle diameter, the control size distribution is controlled at 0.8 μ m, wherein; Sand milling can adopt wet pulverization, utilizes pure water as medium.Press black powder 50wt%, pure water 50wt%, dispersion agent 0.5wt%, doping 0.5wt%, black powder, doping, pure water and the dispersion agent of the main composition of input coarse reduction in sand mill.Dispersion agent black powder in company with the main composition of pre-burning when sand milling begins adds, and effect is to prevent that powder from reuniting, and is beneficial to improve sand milling efficient;
(6) slurrying: when sand grinding process finishes; Stirring more stirred its slip in 1 hour in the slurrying bucket, dropped into the solution and the skimmer of glue Z 150PH again, and total add-on of glue and skimmer is the miscellany 0.5wt% of black; The effect of glue is that it has very strong viscosity; Be convenient to the compression moulding of soft ferromagnetic powder, the foam that stirs generation when adding glue is eliminated in acting as of skimmer, prevents that the particle powder is hollow;
(7) spraying drying: through the slurry after the slurrying; The control inlet temperature is at 290 ℃; Temperature out under 80 ℃ through the mist projection granulating tower be sprayed into surface drying, middle moistening, have good fluidity and dispersed particle, be MnZn soft magnetism power ferrite core material.
Embodiment 14
A kind of method of making MnZn soft magnetism power ferrite core material may further comprise the steps:
(1) mixed: prepare main composition, the zinc oxide of 60%mol red stone, 8%mol, the manganese oxide of 32%mol accurately takes by weighing the raw material of main composition by proportioning, adopts that strong to mix machine mixed, and the mixed time of control is 2 hours, then to wherein adding Bi
2O
3, K
2CO
3, CaCO
3, NiO, total add-on is 10000ppm, the add-on of each component is 2500ppm, the powder particle size after mixed is controlled at 1 μ m, makes raw material evenly mixed, when being beneficial to pre-burning at the beginning of single-step solid phase reaction complete;
(2) compressing tablet: the powder after will mixing drops into the powder tabletting machine, is pressed into the scutellate particle powder of certain intensity;
(3) pre-burning: above-mentioned scutellate particle powder is dropped into the rotary kiln pre-burning; Calcined temperature is at 800 ℃, and the pre-burning time is 120 minutes, and the mixed powder flow of control is 6 kg/minute; The rotary kiln rotating speed is 20 rev/mins; Make red mixed powder that solid state reaction tentatively take place, be transformed into black by redness, and then to Nb wherein
2O
5, NiO, Bi
2O
3, K
2CO
3, CaCO
3, total add-on is 5000ppm, the addition of every kind of component is 1000ppm;
(4) coarse reduction: the miscellany of above-mentioned black is carried out coarse reduction, adopt vibromill, the pulverizing time is 120 minutes, makes particle size dispersion even, and radius is littler, crosses 200 eye mesh screen percent of pass with water jetting and is controlled at more than 95%;
(5) sand milling: will carry out sand milling through the miscellany of the black of coarse reduction, and obtain the black powder of fine powder after broken, the whole sand milling time is 180 minutes; Blended stock relies on steel ball and powder particle in sand mill, the friction between powder particle and the powder particle, and percussion further reduces the particulate median size; Dwindle the distribution range of its particle diameter, the control size distribution is controlled at 1 μ m, wherein; Sand milling can adopt wet pulverization, utilizes pure water as medium.Press black powder 70wt%, pure water 30wt%, dispersion agent 1wt%, doping 1wt%, black powder, doping, pure water and the dispersion agent of the main composition of input coarse reduction in sand mill.Dispersion agent black powder in company with the main composition of pre-burning when sand milling begins adds, and effect is to prevent that powder from reuniting, and is beneficial to improve sand milling efficient;
(6) slurrying: when sand grinding process finishes; Stirring more stirred its slip in 2 hours in the slurrying bucket, dropped into the solution and the skimmer of glue Z 150PH again, and total add-on of glue and skimmer is the miscellany 1wt% of black; The effect of glue is that it has very strong viscosity; Be convenient to the compression moulding of soft ferromagnetic powder, the foam that stirs generation when adding glue is eliminated in acting as of skimmer, prevents that the particle powder is hollow;
(7) spraying drying: through the slurry after the slurrying; The control inlet temperature is at 350 ℃; Temperature out under 110 ℃ through the mist projection granulating tower be sprayed into surface drying, middle moistening, have good fluidity and dispersed particle, be MnZn soft magnetism power ferrite core material.
Claims (7)
1. method of making MnZn soft magnetism power ferrite core material is characterized in that this method may further comprise the steps:
(1) mixed: accurately take by weighing the raw material of main composition by proportioning, adopt that strong to mix machine mixed, the mixed time of control is 2 hours, and the powder particle size after mixed is controlled at 0.8～1.0 μ m;
(2) compressing tablet: the powder after will mixing drops into the powder tabletting machine, is pressed into the scutellate particle powder of certain intensity;
(3) pre-burning: above-mentioned scutellate particle powder is dropped into the rotary kiln pre-burning; Calcined temperature is at 700～800 ℃; The pre-burning time is 80～120 minutes, and the mixed powder flow of control is 4～6 kg/minute, and the rotary kiln rotating speed is 5～20 rev/mins; Make red mixed powder that solid state reaction tentatively take place, be transformed into black by redness;
(4) coarse reduction: the miscellany of above-mentioned black is carried out coarse reduction, adopt vibromill, the pulverizing time is 60～120 minutes, makes particle size dispersion even, crosses 200 eye mesh screens with water jetting;
(5) sand milling: will carry out sand milling through the miscellany of the black of coarse reduction, and obtain the black powder of fine powder after broken, the whole sand milling time is 100～180 minutes, and the control size distribution is controlled at 0.8～1.0 μ m;
(6) slurrying: when sand grinding process finished, stirring more stirred its slip in 1-2 hour in the slurrying bucket, dropped into glue and skimmer again, and total add-on of glue and skimmer is the miscellany 0.5～1wt% of black;
(7) spraying drying: through the slurry after the slurrying; The control inlet temperature is at 290 ℃～350 ℃; Temperature out under 80 ℃～110 ℃ through the mist projection granulating tower be sprayed into surface drying, middle moistening, have good fluidity and dispersed particle, be MnZn soft magnetism power ferrite core material.
2. a kind of method of making MnZn soft magnetism power ferrite core material according to claim 1; It is characterized in that; Main composition described in the step (1) comprises following component and mole percent level: the zinc oxide of 55～60%mol red stone, 3～8%mol, the manganese oxide of 32～42%mol.
3. a kind of method of making MnZn soft magnetism power ferrite core material according to claim 1 is characterized in that the main composition described in the step (1) again to wherein adding additive, is selected from Bi after mixing
2O
3, K
2CO
3, CaCO
3Or among the NiO three kinds or four kinds.
4. a kind of method of making MnZn soft magnetism power ferrite core material according to claim 3 is characterized in that total add-on of described additive is 400～10000ppm, and the addition of every kind of component is: 100～2500ppm.
5. a kind of method of making MnZn soft magnetism power ferrite core material according to claim 1 is characterized in that, the scutellate particle powder described in the step (3) again to wherein adding micro-additive, is selected from Nb after the process pre-burning
2O
5, NiO, Bi
2O
3, K
2CO
3Or CaCO
3In four kinds or five kinds.
6. a kind of method of making MnZn soft magnetism power ferrite core material according to claim 5 is characterized in that total add-on of described micro-additive is 500～5000ppm, and the addition of every kind of component is 100～1000ppm.
7. a kind of method of making MnZn soft magnetism power ferrite core material according to claim 1 is characterized in that the glue described in the step (6) is polyvinyl alcohol solution.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104557001A (en) * | 2015-01-15 | 2015-04-29 | 安徽龙磁科技股份有限公司 | Low-magnetic loss ferrite magnetic core material |
| CN106328335A (en) * | 2015-06-30 | 2017-01-11 | 上海康顺磁性元件厂有限公司 | Soft magnetic manganese-zinc ferrite material with ultrahigh magnetic permeability and preparation method thereof |
| CN108292555A (en) * | 2015-11-24 | 2018-07-17 | 摩达伊诺琴股份有限公司 | Power inductor |
| CN109071263A (en) * | 2016-05-06 | 2018-12-21 | 保德科技股份有限公司 | Ferrite powder, resin combination and formed body |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101996725A (en) * | 2009-08-27 | 2011-03-30 | 上海康顺磁性元件厂有限公司 | Soft magnetic mangan zinc ferrite material capable of reducing heat productivity and preparation method thereof |
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2011
- 2011-12-01 CN CN2011103941840A patent/CN102674821A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101996725A (en) * | 2009-08-27 | 2011-03-30 | 上海康顺磁性元件厂有限公司 | Soft magnetic mangan zinc ferrite material capable of reducing heat productivity and preparation method thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104557001A (en) * | 2015-01-15 | 2015-04-29 | 安徽龙磁科技股份有限公司 | Low-magnetic loss ferrite magnetic core material |
| CN106328335A (en) * | 2015-06-30 | 2017-01-11 | 上海康顺磁性元件厂有限公司 | Soft magnetic manganese-zinc ferrite material with ultrahigh magnetic permeability and preparation method thereof |
| CN108292555A (en) * | 2015-11-24 | 2018-07-17 | 摩达伊诺琴股份有限公司 | Power inductor |
| US11139094B2 (en) | 2015-11-24 | 2021-10-05 | Moda-Innochips Co., Ltd. | Power inductor |
| CN109071263A (en) * | 2016-05-06 | 2018-12-21 | 保德科技股份有限公司 | Ferrite powder, resin combination and formed body |
| CN109071263B (en) * | 2016-05-06 | 2021-03-12 | 保德科技股份有限公司 | Ferrite powder, resin composition and molded body |
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Application publication date: 20120919 |