CN102211929A - Low-temperature sintered high-permeability NiCuZn ferrite material - Google Patents
Low-temperature sintered high-permeability NiCuZn ferrite material Download PDFInfo
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- CN102211929A CN102211929A CN2011100701756A CN201110070175A CN102211929A CN 102211929 A CN102211929 A CN 102211929A CN 2011100701756 A CN2011100701756 A CN 2011100701756A CN 201110070175 A CN201110070175 A CN 201110070175A CN 102211929 A CN102211929 A CN 102211929A
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Abstract
The invention discloses a low-temperature sintered high-permeability NiCuZn ferrite material for a wire wound chip inductor and a preparation method of the ferrite material. The ferrite material comprises the following main components based on oxide content: 40.5 to 49.6 moles percent of Fe2O3, 30 to 47 moles percent of ZnO, 5 to 20 moles percent of CuO and the balance of NiO. The preparation method comprises the following steps of: (1) mixing raw materials, (2) performing primary sanding, (3) performing primary spray drying and granulation, (4) pre-sintering, (5) adding trace elements, (6) performing secondary sanding, (7) performing secondary spray drying and granulation, (8) molding and (9) sintering. By adding auxiliary components such as NaCO3, B2O3, Ta2O5 and the like, the sintering temperature is greatly reduced, the sintering temperature is below 900 DEG C, the high-frequency electromagnetic performance of the material is greatly improved, the sintering density of the material is improved, the mechanical strength of the material is improved, and the manufacturing process requirement of the wire wound chip inductor is met; and on the other hand, energy is saved, and the producing and manufacturing costs are greatly reduced. The initial permeability of the material is 2,850; the specific loss coefficient of the material is less than 5.5*10<-6> under the test conditions of 100 kHz and 0.25mT; and the specific loss coefficient of the material is less than 25.6*10<-6> under the test conditions of 500 kHz and 0.25mT.
Description
Technical field
The present invention relates to a kind of low-temperature sintering high magnetic permeability NiCuZn ferrite material preparation method for material.
Background technology
The continuous progress of modern electronic technology, require electronics constantly to develop to miniaturization, lightweight, slimming direction, in addition for adapting to the needs of modern communication, network technology, computer, audio-visual equipment, teleworking equipment, automobile electronic system, military and aerospace electronics and electromagnetic compatibility (EMC), also obtained bigger development as the chip inductor of one of three big passive devices.
From a structural point, chip inductor has two kinds, and the one, laminated chip inductor, another kind are the wire-wound chip inductor devices.These two kinds of chip inductors respectively have its outstanding advantage: the laminated chip inductor size can be done forr a short time, but because structural reason, inductance value can not be done very greatly, and allows the rated direct current that passes through limited; The wire-wound chip inductor device then can be done inductance bigger, and the rated direct current that allows to pass through can be bigger, but size is done to such an extent that have any problem more for a short time.Therefore, these two kinds of chip inductors have different application in different occasions, and both replenish mutually, and are indispensable.
Traditional high magnetic permeability NiZn ferrite, because the sintering temperature height, and sintered density is difficult to improve, therefore, product strength is also relatively poor, is difficult to use wire-wound chip inductor device Application Areas.
Replace the NiCuZn Ferrite Material that part Ni forms by in the NiZn Ferrite Material, introducing proper C u, not only can significantly improve the sintering characteristic of material, and in certain scope also magnetic permeability, volume density and the intensity to material certain adjustment and improvement effect are all arranged.The external NiCuZn Ferrite Material that utilizes the conventional ceramic technique preparation to be used for the wire-wound chip inductor device of having developed the earliest.
The NiCuZn Ferrite Material that is used for the wire-wound chip inductor device in early days, although compare with traditional NiZn material, sintering temperature has been reduced to about 1150 ℃, but still can not satisfy the new wound-rotor type chip inductor aspect high frequency and the physical strength further to the growth requirement of miniaturization.For this reason, must on prescription and sintering process, be further improved.
In order to reduce sintering temperature, improve the performance of material, the measure of mainly taking at present mainly contains following a few class:
1, takes or invent new preparation method and replace original conventional ceramic technique.For example coprecipitation method, sol-gel method, sol-gel self-propagating combustion, hydrothermal method and spread method etc. certainly.Though these methods all each have its characteristics, some defectives of conventional ceramic technique have also been overcome to a certain extent, but manufacturing cost is too high, technology controlling and process and stable aspect are compared with conventional ceramic technique in addition, still exist many deficiencies, technology is also not mature enough, and environment is also had to a certain degree pollution.
2, add fusing assistant.In manufacture method or invention in the past, add Bi usually
2O
3, V
2O
5, MoO
3, In
2O
3And the combination of other relevant oxide compounds is as fusing assistant, though for reducing sintering temperature certain effect is arranged, along with the interpolation of fusing assistant, the loss of material increases, and makes the degradation of product; In addition, because the price of these oxide compounds is very high, increased production cost greatly; Therefore, must seek more suitable trace additives.
3, adjusting process, the refinement powder.The mean particle size of powder is reduced to submicron or Nano grade, increased the particulate specific surface area, improved the activity of powder, but the simple granularity that reduces will propose higher requirement to equipment, be unfavorable for the decline of cost, and reducing granularity by adjusting process also has certain limit merely, can not be unlimited reduce granularity, after granularity drops to a certain degree, reunite again easily.
Therefore, best bet still adopts conventional ceramic technique, by optimizing material prescription, selects more suitable trace element and determines its optimal addn, determine the optimum sintering process parameter by a large amount of technological experiments, thereby obtain to have the low-temperature sintering NiCuZn Ferrite Material of higher magnetic permcability.
Summary of the invention
The purpose of this invention is to provide a kind of low-temperature sintering high magnetic permeability NiCuZn ferrite material preparation method for material.
A kind of NiCuZn Ferrite Material provided by the invention, it is characterized in that: this material comprises principal constituent and ancillary component, principal constituent with composition calculated by content of oxides is: Fe
2O
3Be 40.5～49.6mol%; ZnO is 30～47mol%; CuO is 5～20mol%; Surplus is NiO; Described ancillary component comprises NaCO
3, B
2O
3, Ta
2O
5, described relatively principal constituent total amount, the content of ancillary component is respectively: NaCO
3: 0.08～0.65wt%, B
2O
3: 0.03～0.55wt%, Ta
2O
5: 0.05～0.45wt%.
The NiCuZn Ferrite Material of the present invention's preparation, it is characterized in that: can form at sintering below 900 ℃, the initial permeability of the material of acquisition under 25 ℃ is up to 2850, and the specific loss coefficient under the test condition of 100kHz and 0.25mT is less than 5.5 * 10
-6, the specific loss coefficient under the test condition of 500kHz and 0.25mT is less than 25.6 * 10
-6Relevant ancillary component of the present invention is as NaCO
3, B
2O
3, Ta
2O
5Deng, price is comparatively cheap, and this can reduce production costs greatly.
The step of low-temperature sintering high magnetic permeability NiCuZn ferrite material preparation method for material is:
(1) starting material mix and pre-burning: the Fe that gets 40.5～49.6mol%
2O
3, the ZnO of 30～47mol%, the CuO of 5～20mol%, surplus be NiO as starting material, mix and be ground to 1.0-5.0 μ m, carry out pre-burning after the oven dry;
(2) pre-imitation frosted glass is carried out the interpolation of ancillary component: adopt NaCO
3, B
2O
3, Ta
2O
5As additive,
Wherein: NaCO
3: 0.08～0.65wt%, B
2O
3: 0.03～0.55wt%, Ta
2O
5: 0.05～0.45wt%;
(3) sand milling or ball milling: with ferrite prefiring material and above-mentioned trace element puts into sand milling or ball mill grinds, the mean particle size that makes pre-imitation frosted glass is less than 1.0 μ m;
(4) drying-granulating and moulding: slip is carried out spray drying granulation, and the ferrite powder pellet is pressed into the ferrite blank;
(5) sintering: the ferrite blank is put into the stove sintering, and sintering temperature is 860～900 ℃, and sintering time is 10-20 hour, is incubated 2～4 hours.
Concrete starting material mix and pre-sinter process:
Starting material carry out sand milling and spray drying granulation earlier, and load weighted starting material are put into sand mill, and at the deionized water of weight such as adding in advance, sand milling is about 0.5 hour; In the starting material slip, add about 10%PVA solution (concentration is about 10%), carry out spray drying granulation one time.Then, a spray drying granulation powder is carried out pre-burning by rotary kiln, calcined temperature is 700～750 ℃.
Secondary sand milling and spray drying granulation technology:
Ferrite prefiring material and above-mentioned ancillary component are put into sand mill, and at the deionized water of weight such as adding in advance, sand milling 1～2 hour, the mean particle size that makes pre-imitation frosted glass is less than 1.0 μ m; In ferrite slurry, add about 10%PVA solution (concentration is about 10%), carry out the secondary spray drying granulation.
Moulding and sintering process:
The ferrite blank is put into the stove sintering, and sintering temperature is 860～900 ℃, and sintering time especially is 10-20 hour, is incubated 2～4 hours.
The invention has the beneficial effects as follows: the NiCuZn Ferrite Material even grain size of utilizing the present invention to prepare, crystal boundary is clear, and crystal grain is complete, excellent in high-frequency characteristics; Density and physical strength are higher, are suitable for the manufacturing of wire-wound chip inductor device.The present invention uses CuO to substitute part NiO, adds some trace elements simultaneously, for example: NaCO
3, B
2O
3, Ta
2O
5Sintering temperature is reduced significantly, the NiCuZn Ferrite Material of the present invention's preparation can form at sintering below 900 ℃, thereby improve the high-frequency electromagnetic performance of material greatly, improve the sintered density of material again, improve the physical strength of material greatly, satisfy the manufacture process requirement of wire-wound chip inductor device, the initial permeability of material under 25 ℃ that obtains is up to 2800, and the specific loss coefficient under the test condition of 100kHz and 0.25mT is less than 5.5 * 10
-6, the specific loss coefficient under the test condition of 500kHz and 0.25mT is less than 25.6 * 10
-6Relevant ancillary component of the present invention is as NaCO
3, B
2O
3, Ta
2O
5Deng, price is comparatively cheap, and this can reduce production costs greatly, simultaneously because ferrite can be at lower sintering temperature, thereby can save the energy greatly.
Embodiment
Below, embodiments of the present invention are described.
The invention provides a kind of low-temperature sintering high magnetic permeability NiCuZn Ferrite Material and preparation method thereof.By optimizing material prescription, select suitable ancillary component, and determine its optimal addn, determined the optimum sintering process parameter by a large amount of experiments, make calcined temperature be lower than 750 ℃, sintering temperature is lower than 900 ℃, improves the high-frequency electromagnetic performance of material greatly, has improved the sintered density of material, and improved the physical strength of material, satisfy the manufacture process requirement of wire-wound chip inductor device, saved the energy on the other hand again, greatly reduced manufacturing cost.The initial permeability of material is up to 2850, and the specific loss coefficient under the test condition of 100kHz and 0.25mT is less than 5.5 * 10
-6, the specific loss coefficient under the test condition of 500kHz and 0.25mT is less than 25.6 * 10
-6
Make low-temperature sintering high magnetic permeability NiCuZn Ferrite Material, selected starting material adopt commercially pure Fe2O3, ZnO, NiO and CuO.Take by weighing various starting material according to prescription and carry out wet-milling, mix grinding equipment choosing sand mill.In the wet-milling process, the deionized water of quality such as adding, sand milling made that the starting material thorough mixing is even about 0.5 hour.
Temperature range during pre-burning is 700～750 ℃, because main formula is rich Cu prescription, CuO can form CuFe2O4 with Fe2O3 near 700 ℃, make point product stone ferrite to form in very low temperature, this is very favorable for the follow-up sintering reaction of promotion, and can effectively reduce sintering temperature.
The present invention has adopted very effective trace element to add combination, adopts NaCO
3, B
2O
3The associating interpolation can effectively reduce sintering temperature as fusing assistant, makes sintering temperature be reduced to below 900 ℃, and promotes ferrite crystal grains effectively to grow, and the initial permeability that makes Ferrite Material is up to 2950.But because NaCO
3And B
2O
3To promoting the remarkable effect of ferrite liquid phase sintering, be easy to impel ferrite crystal grains misgrowth, therefore, as independent interpolation NaCO
3And B
2O
3The time, the high frequency performance of Ferrite Material is relatively poor, and the specific loss coefficient under the test condition of 500kHz and 0.25mT is greater than 250 * 10
-6
In order to obtain good high frequency performance, be necessary to introduce some oxide compound, control the misgrowth of crystal grain.The present invention finds by a large amount of tests, Ta
2O
5Can effectively control the misgrowth of ferrite crystal grains, this is because Ta
2O
5Have very high fusing point, the Ta atomic radius is bigger simultaneously, is difficult to enter ferrite crystal grains inside, thereby can effectively stops because of NaCO
3And B
2O
3The misgrowth of the caused ferrite crystal grains of adding.By to ancillary component NaCO
3, B
2O
3And Ta
2O
5The composite test of add-on, find that the add-on of ancillary component is respectively: NaCO
3: 0.08～0.65wt%, B
2O
3: 0.03～0.55wt%, Ta
2O
5: during 0.05～0.45wt%, can obtain good electromagnetic performance.Material can be at sintering below 900 ℃, and the initial permeability of acquisition is up to 2850, and the specific loss coefficient under the test condition of 100kHz and 0.25mT is less than 5.5 * 10
-6, the specific loss coefficient under the test condition of 500kHz and 0.25mT is less than 25.6 * 10
-6This is because by adding Ta
2O
5Obtained good microstructure, the Ferrite Material even grain size, crystal boundary is clear, and crystal grain is complete, excellent in high-frequency characteristics, ferrite density and physical strength obviously improve simultaneously, have satisfied the manufacture process requirement of wire-wound chip inductor device.
Initial permeability provided by the invention is that 2850 low-temperature sintering high magnetic permeability NiCuZn Ferrite Materials and preparation process specify as follows:
1, raw-material selection and main formula design: the starting material of high magnetoconductivity low temperature agglomerating NiCuZn Ferrite Material provided by the invention, select commercially pure Fe
2O
3, ZnO, NiO and CuO.The main composition and the content of Ferrite Material are calculated as with oxide compound: Fe
2O
3Be 40.5～49.6mol%; ZnO is 30～47mol%; CuO is 5～20mol%; Surplus is NiO;
(1) starting material mix: take by weighing corresponding starting material according to prescription.
(2) sand millings: load weighted starting material are put into sand mill, and at the deionized water of weight such as adding in advance, sand milling is about 0.5 hour; Mean particle size generally is controlled at 1.0-5.0 μ m.
(3) spray drying granulations: in the starting material slip, add about 10%PVA solution (concentration is about 10%), carry out spray drying granulation one time.
(4) pre-burning: a mist projection granulating powder is carried out pre-burning by rotary kiln, and calcined temperature is 700～750 ℃.
(5) interpolation of ancillary component: adopt NaCO
3, B
2O
3, Ta
2O
5As additive, wherein: NaCO
3: 0.08～0.65wt%, B
2O
3: 0.03～0.55wt%, Ta
2O
5: 0.05～0.45wt%.
(6) secondary sand milling: ferrite prefiring material and above-mentioned impurity are put into sand mill, and at the deionized water of weight such as adding in advance, sand milling 2 hours, the mean particle size that makes pre-imitation frosted glass is less than 1 μ m;
(7) secondary spray drying granulation: in ferrite slurry, add about 10%PVA solution (concentration is about 10%), carry out the secondary spray drying granulation.
(8) moulding: secondary spray drying granulation ferrite powder is pressed into the ferrite blank.
(9) sintering: the ferrite blank is put into the stove sintering, and sintering temperature is 860～900 ℃, and sintering time is 10-20 hour, is incubated 2～4 hours.Sintering carries out in air, need not protective atmosphere, and agglomerating plant can be box-type furnace, bell jar stove or full-automatic pushed bat kiln.
NiCuZn Ferrite Material by the inventive method preparation can be implemented in sintering in 900 ℃ of following scopes, and initial magnetic magnetic permeability is 2850,, the specific loss coefficient under the test condition of 100kHz and 0.25mT is less than 5.5 * 10
-6, the specific loss coefficient under the test condition of 500kHz and 0.25mT is less than 25.6 * 10
-6The invention provides a kind of low-temperature sintering high magnetic permeability NiCuZn Ferrite Material and preparation method thereof.By optimizing material prescription, select suitable ancillary component, and determine its optimal addn, determined the optimum sintering process parameter by a large amount of experiments, make calcined temperature be lower than 750 ℃, sintering temperature is lower than 900 ℃, improves the high-frequency electromagnetic performance of material greatly, has improved the sintered density of material, and improved the physical strength of material, satisfy the manufacture process requirement of wire-wound chip inductor device, saved the energy on the other hand again, greatly reduced manufacturing cost.Below be that specific embodiment is to further specify effect of the present invention.
Embodiment 1:
(1) raw-material selection: the starting material of the low sintering NiCuZn Ferrite Material that provides are selected commercially pure Fe
2O
3, ZnO, NiO, CuO.
(2) composition design and weighing: according to principal constituent Fe
2O
3For 49.2mol%, ZnO are that 37mol%, CuO are that 10mol%, NiO are 3.8mol%, take by weighing the Fe of corresponding weight
2O
3, ZnO, CuO and NiO.
(3) raw-material mixing: the starting material that weigh up are put into sand mill, the deionized water of weight such as adding, sand milling 0.5 hour.
(4) spray drying granulations:
In the starting material slip, add about 10%PVA solution (concentration is about 10%), carry out spray drying granulation one time.
(5) pre-burning:
A spray drying granulation powder is carried out pre-burning by rotary kiln, and calcined temperature is 750 ℃.
(6) ancillary component adds:
NaCO
3：0.60wt％、B
2O
3：0.08wt％、Ta
2O
5：0.25wt％。
(7) secondary sand milling:
Ferrite prefiring material and above-mentioned ancillary component are put into sand mill, and at the deionized water of weight such as adding in advance, sand milling 2 hours, the mean particle size that makes pre-imitation frosted glass is less than 1.0 μ m;
(8) secondary spray drying granulation:
In ferrite slurry, add about 10%PVA solution (concentration is about 10%), carry out the secondary spray drying granulation.
(9) moulding:
Secondary spray drying granulation ferrite powder is pressed into ferrite sample ring blank.
(10) sintering:
The ferrite blank is put into the box-type furnace sintering, and sintering temperature is 890 ℃, is incubated 3 hours, and sintering carries out in air, need not protective atmosphere, and furnace cooling is to room temperature.
The magnetism testing of the sample ring for preparing carries out on the HP4284A electric impedance analyzer, and the density of sample adopts buoyancy method to measure.The magnetic property of sample and density measurement result are as shown in table 1:
Table 1: the magnetic property of sintered sample and the test result of density:
Embodiment 2:
(1) selection of material: the starting material of the low sintering NiCuZn Ferrite Material that provides are selected commercially pure Fe
2O
3, ZnO, NiO and CuO.
(2) composition design and weighing: according to Fe
2O
3For 46mol%, ZnO are that 32mol%, CuO are that 15mol%, NiO are the Fe that 7mol% takes by weighing corresponding weight
2O
3, ZnO, CuO and NiO.
(3) raw-material mixing: the starting material that weigh up are put into sand mill, the deionized water of weight such as adding, sand milling 0.5 hour.
(4) spray drying granulations:
In the starting material slip, add about 10%PVA solution (concentration is about 10%), carry out spray drying granulation one time.
(5) pre-burning:
A spray drying granulation powder is carried out pre-burning by rotary kiln, and calcined temperature is 730 ℃.
(6) ancillary component adds:
NaCO
3：0.25wt％、B
2O
3：0.20wt％、Ta
2O
5：0.18wt％。
(7) secondary sand milling:
Ferrite prefiring material and above-mentioned impurity are put into sand mill, and at the deionized water of weight such as adding in advance, sand milling 1.5 hours, the mean particle size that makes pre-imitation frosted glass is less than 1.0 μ m;
(8) secondary spray drying granulation:
In ferrite slurry, add about 10%PVA solution (concentration is about 10%), carry out the secondary spray drying granulation.
(9) moulding:
Secondary spray drying granulation ferrite powder is pressed into ferrite sample ring blank.
(10) sintering:
The ferrite blank is put into the box-type furnace sintering, and sintering temperature is 870 ℃, is incubated 3 hours, and sintering carries out in air, need not protective atmosphere, and furnace cooling is to room temperature.
The magnetism testing of the sample ring for preparing carries out on the cloudy anti-analyser of HP4284A, and the density of sample adopts buoyancy method to measure.The magnetic property of sample and density measurement result are as shown in table 2:
Table 2: the magnetic property of sintered sample and the test result of density:
Embodiment 3:
(1) selection of material: the starting material of the low sintering NiCuZn Ferrite Material that provides are selected commercially pure Fe
2O
3, ZnO, NiO and CuO.
(2) composition design and weighing: according to prescription Fe
2O
3For 41mol%, ZnO are that 30mol%, CuO are that 19mol%, NiO are 10mol%, take by weighing the Fe of corresponding weight
2O
3, ZnO, CuO and NiO.
(3) raw-material mixing: the starting material that weigh up are put into sand mill, the deionized water of weight such as adding, sand milling 0.5 hour.
(4) spray drying granulations:
In the starting material slip, add about 10%PVA solution (concentration is about 10%), carry out spray drying granulation one time.
(5) pre-burning:
A spray drying granulation powder is carried out pre-burning by rotary kiln, and calcined temperature is 710 ℃.
(6) ancillary component adds:
NaCO
3：0.10wt％、B
2O
3：0.35wt％、Ta
2O
5：0.08wt％。
(7) secondary sand milling:
Ferrite prefiring material and above-mentioned impurity are put into sand mill, and at the deionized water of weight such as adding in advance, sand milling 2.0 hours, the mean particle size that makes pre-imitation frosted glass is less than 1.0 μ m;
(8) secondary spray drying granulation:
In ferrite slurry, add about 10%PVA solution (concentration is about 10%), carry out the secondary spray drying granulation.
(9) moulding:
Secondary spray drying granulation ferrite powder is pressed into ferrite sample ring blank.
(10) sintering:
The ferrite blank is put into the box-type furnace sintering, and sintering temperature is 860 ℃, is incubated 3 hours, and sintering carries out in air, need not protective atmosphere, and furnace cooling is to room temperature.
The magnetism testing of the sample ring for preparing carries out on the cloudy anti-analyser of HP4284A, and the density of sample adopts buoyancy method to measure.The magnetic property of sample and density measurement result are as shown in table 3:
Table 3: the magnetic property of sintered sample and the test result of density:
Claims (2)
1. low-temperature sintering high magnetic permeability NiCuZn Ferrite Material, it is characterized in that: this material is a kind of NiCuZn Ferrite Material, comprises principal constituent and ancillary component, and principal constituent with composition calculated by content of oxides is: Fe
2O
3Be 40.5～49.6mol%; ZnO is 30～47mol%; CuO is 5～20mol%; Surplus is NiO; Described ancillary component comprises NaCO
3, B
2O
3, Ta
2O
5, described relatively principal constituent total amount, NaCO
3, B
2O
3, Ta
2O
5Total content be 0.16wt%～1.65wt%.
The NiCuZn Ferrite Material of the present invention's preparation, it is characterized in that: this material can form at sintering below 900 ℃, the initial permeability of material under 25 ℃ that obtains is up to 2850, and the specific loss coefficient under the test condition of 100kHz and 0.25mT is less than 5.5 * 10
-6, the specific loss coefficient under the test condition of 500kHz and 0.25mT is less than 25.6 * 10
-6
2. low-temperature sintering high magnetic permeability NiCuZn Ferrite Material according to claim 1, it is characterized in that: described ancillary component with respect to the content of principal constituent is respectively: NaCO
3: 0.08～0.65wt%, B
2O
3: 0.03～0.55wt%, Ta
2O
5: 0.05～0.45wt%.
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| CN104446421A (en) * | 2014-12-19 | 2015-03-25 | 宝鸡烽火诺信科技有限公司 | High-magnetic conductivity nickel and zinc soft magnetic ferrite material and preparation method |
| WO2015043347A1 (en) | 2013-09-25 | 2015-04-02 | Byd Company Limited | Wave absorbing material and method of preparing the same |
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| CN105601262A (en) * | 2015-12-23 | 2016-05-25 | 苏州冠达磁业有限公司 | Preparation method of ferrite magnetic material for multilayer chip inductor |
| CN108774056A (en) * | 2018-06-14 | 2018-11-09 | 横店集团东磁股份有限公司 | A kind of NiZn ferrites magnetic sheet and its preparation method and application |
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| CN105036722A (en) * | 2015-06-25 | 2015-11-11 | 深圳振华富电子有限公司 | Nicuzn ferrite and preparation method thereof |
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| CN105198396A (en) * | 2015-10-14 | 2015-12-30 | 广东成电华瓷电子科技有限公司 | NiCuZn ferrite material and manufacturing method thereof |
| CN105198396B (en) * | 2015-10-14 | 2019-05-28 | 广东成电华瓷电子科技有限公司 | A kind of NiCuZn ferrite material and its manufacturing method |
| CN105601262A (en) * | 2015-12-23 | 2016-05-25 | 苏州冠达磁业有限公司 | Preparation method of ferrite magnetic material for multilayer chip inductor |
| CN108774056A (en) * | 2018-06-14 | 2018-11-09 | 横店集团东磁股份有限公司 | A kind of NiZn ferrites magnetic sheet and its preparation method and application |
| CN108774056B (en) * | 2018-06-14 | 2021-04-20 | 横店集团东磁股份有限公司 | NiZn ferrite magnetic sheet and preparation method and application thereof |
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