CN109485403A - A kind of high BsLow loss soft magnetic ferrite material and preparation method thereof - Google Patents
A kind of high BsLow loss soft magnetic ferrite material and preparation method thereof Download PDFInfo
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- CN109485403A CN109485403A CN201811259313.3A CN201811259313A CN109485403A CN 109485403 A CN109485403 A CN 109485403A CN 201811259313 A CN201811259313 A CN 201811259313A CN 109485403 A CN109485403 A CN 109485403A
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- soft magnetic
- magnetic ferrite
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- 239000000463 material Substances 0.000 title claims abstract description 43
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 24
- ZKATWMILCYLAPD-UHFFFAOYSA-N niobium pentoxide Chemical compound O=[Nb](=O)O[Nb](=O)=O ZKATWMILCYLAPD-UHFFFAOYSA-N 0.000 claims abstract description 17
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 16
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000004576 sand Substances 0.000 claims abstract description 16
- 239000004615 ingredient Substances 0.000 claims abstract description 15
- 238000003801 milling Methods 0.000 claims abstract description 11
- 239000002019 doping agent Substances 0.000 claims abstract description 9
- PBCFLUZVCVVTBY-UHFFFAOYSA-N tantalum pentoxide Inorganic materials O=[Ta](=O)O[Ta](=O)=O PBCFLUZVCVVTBY-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 8
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 5
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 5
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 5
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 5
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 4
- 238000005245 sintering Methods 0.000 claims description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 238000000280 densification Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 5
- 235000020985 whole grains Nutrition 0.000 claims description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- 238000000748 compression moulding Methods 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000011236 particulate material Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 238000000465 moulding Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 13
- 230000004907 flux Effects 0.000 description 6
- 230000035699 permeability Effects 0.000 description 6
- 239000000047 product Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
- C04B35/2608—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead
- C04B35/2633—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead containing barium, strontium or calcium
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
- H01F1/36—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites in the form of particles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
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Abstract
The present invention provides a kind of high BsLow loss soft magnetic ferrite material, each major ingredient of soft magnetic ferrite includes: Fe2O3: 58.0~62.0mol%, ZnO:12.0~14.0mol%, NiO:1.0~4.0mol%, surplus MnO.By weight percentage, it and using the major ingredient after pre-burning as reference data, is calculated with oxide, dopant includes SiO2: 0.00~0.01wt%, CaCO3: 0.01~0.12wt%, ZrO2: 0.01~0.05wt%, Nb2O5: 0.01~0.03wt%, Ta2O5: 0.005~0.02wt%；Then formula, primary sand milling, pre-burning, doping, secondary sand milling, molding are passed sequentially through and is sintered to get the magnet ring sample.Material has high BsLow loss characteristic is able to satisfy the requirement of power transformer miniaturization and high efficiency.
Description
Technical field
The invention belongs to soft magnetic ferrite technical fields, and in particular to a kind of high BsLow loss soft magnetic ferrite material
And preparation method thereof.
Background technique
With the extensive use of mancarried electronic aid, electronic product develops that have become must towards light, thin, short, small direction
Right trend promotes power-supply system to develop to light, thin, small and high efficiency direction, it is desirable that power transformer carries bigger power
Density requires the saturation flux density for further increasing core material, reduces loss.For the requirement of corresponding power transformer,
Develop corresponding high BsLow loss soft magnetic ferrite material is very necessary.
Oneself has some high B of correlation at homesThe patent of low loss soft magnetic ferrite material and preparation method thereof, specifically such as
Under:
(1) in patent CN1294099A, a kind of high B of high temperature is disclosed disclosed in the ChinasPower ferrite material leads to
Cross the B that NiO replaces MnO to improve materials, but its 100 DEG C, the B under 1194A/msOnly 440mT；
(2) in patent CN101429016A, a kind of MnZn power ferrite material, Curie's temperature are disclosed disclosed in the China
Degree is 280 DEG C, 100 DEG C, the B under 1194A/msIt is T in current material for 460mTcAnd BsHigher material has relatively strong
The market competitiveness；
(3) in patent CN1890197A, a kind of high temperature superelevation B is disclosed disclosed in the Chinas MnZn power ferrite material
Material, main formula are as follows: Fe2O3: 63-80mol%, ZnO:3-15mol%, Yu Wei MnO, auxiliary element include CaO, Si02,
8 hours are kept the temperature at 1175 DEG C.The Ferrite Material performance of acquisition are as follows: at 100 DEG C, BsFor 520mT, but its loss is too high,
Loss under 50kHz, 150mT is up to 1100kW/m3；
(4) in patent CN103214233A, a kind of high T is disclosed disclosed in the Chinac, wide warm superelevation BsMnZn ferrite material
Material and preparation method, belong to Ferrite Material preparation technical field.Ferrite Material of the invention is made of major ingredient and dopant,
It is characterized in that, major ingredient includes: 58.0~62.0mol% Fe2O3, 10.0~15.0mol%ZnO, 4.0~6.0mol%NiO are remaining
Amount is MnO;By weight percentage, it and using the major ingredient after pre-burning as reference data, is calculated with oxide, dopant includes:
Mo03: 0.001~0.30wt%, Bi203: 0.01~0.40wt%, Sn02: 0.001~0.05wt%, Nb205: 0.001~
0.05wt%、Ta2O5: 0.001~0.20wt%.The present invention has high-curie temperature (Tc>=320 DEG C), the wide high B of temperatures(25 DEG C, Bs
≥600mT;100 DEG C, Bs>=490mT) and compared with low-loss (100 DEG C, 100kHz 200mT, PL≤800kW/m3) etc. characteristics.
Summary of the invention
For the requirement of power transformer miniaturization and high efficiency, the object of the present invention is to provide a kind of high BsLow-loss
Soft magnetic ferrite.
In order to achieve the above object, the present invention takes technical solution below: a kind of high BsLow loss soft magnetic ferrite material
Material, each major ingredient of soft magnetic ferrite includes: Fe2O3: 58.0~62.0mol%, ZnO:12.0~14.0mol%,
NiO:1.0~4.0mol%, surplus MnO.
By weight percentage, it and using the major ingredient after pre-burning as reference data, is calculated with oxide, dopant includes SiO2:
0.00~0.01wt%, CaCO3: 0.01~0.12wt%, ZrO2: 0.01~0.05wt%, Nb2O5: 0.01~0.03wt%, Ta2O5:
0.005~0.02wt%.
As a preference, the preferred Fe of ingredient2O3: 60.0mol%, ZnO:13.0mol%, NiO:3.0mol%,
MnO:24.0 mol%.The preferred SiO of dopant2: 0.005wt%, CaCO3: 0.09wt%, ZrO2: 0.04wt%, Nb2O5:
0.02wt%, Ta2O5: 0.01wt%.
The preparation method of above-mentioned formula includes following steps: formula, primary sands milling, pre-burning, doping, secondary sand milling, at
Type and sintering, in which:
(1) it is formulated: matching Fe by following principal component2O3: 58.0~62.0mol%, ZnO:12.0~14.0mol%, NiO:1.0
~4.0mol%, surplus MnO；
(2) primary to be sanded: to use deionized water to carry out wet-mixing as solvent, each raw material of step (1) are made with sand mill
It is sufficiently mixed uniformly, 10~30min of time is sanded；
(3) pre-burning: will be sanded material drying obtained by step (2), and 760~1000 DEG C pre-burning 1~3 hour；
(4) it adulterates: following accessory ingredient dopant, SiO will be added by weight in the Preburning material of step (3) production2: 0.00~
0.01wt%、CaCO3: 0.01~0.12wt%, ZrO2: 0.01~0.05wt%, Nb2O5: 0.01~0.03wt%, Ta2O5: 0.005
~0.02wt%；
(5) secondary sand milling: powder obtained by step (4) is then sanded 70~140 minutes with sand mill, partial size D50:0.50 is controlled
~1.60 μm；
(6) it forms: step (5) resulting slurry being subjected to spraying or mechanical equipment and is granulated, 0.01~0.02wt% of addition is stearic
Particulate material press compression moulding is corresponding product blank by sour zinc whole grain；
(7) it is sintered: step (6) products obtained therefrom blank being put into sintering in atmosphere furnace, in warming-up section, controls partial pressure of oxygen <
1.0vol% carries out N2Gas shielded dumping densification sintering, and keep the temperature 4~8 hours at 1345~1400 DEG C, oxygen when heat preservation
Partial pressure is 0.2~5vol%, is balanced atmosphere sintering in temperature descending section.
Preferably, the primary sand milling time 15min, 930 DEG C pre-burning 3 hours, the secondary sand milling time be 100 minutes,
Control partial size D50:1.30 μm, add 0.015wt% zinc stearate whole grain.In warming-up section, controls partial pressure of oxygen 0.2vol% and carry out N2
Gas shielded dumping densification sintering, and keep the temperature 6 hours at 1390 DEG C, partial pressure of oxygen when heat preservation is 2.6vol%, in temperature descending section
It is balanced atmosphere sintering.
The magnet ring sample (T18 × 8 × 5) is made by the above process.
The present invention uses reasonable main formula, by adjusting Fe2O3The B of material is improved with NiO contents；By adjusting
SiO2、CaCO3、ZrO2、Nb2O5、Ta2O5Content refines crystal grain, reduces stomata, the microstructure for improving material realizes material
Low-loss；By adjusting calcined temperature, grinding time and use N2Gas shielded dumping densification sintering technique is burnt to improve
At density dbWith the initial permeability μ for improving materiali, obtain fine and close crystalline state.The material has preferable electromagnetic performance,
Adapt to the requirement of power transformer.
The performance indicator of material is as follows:
Initial permeability μi: 2000 ± 25%；
Power loss density PV350 kW/m of (25kHz, 200mT): <3(100) DEG C；
Saturation flux density Bs(1kHz, 1194A/m): >=490 mT (100) DEG C；
Density db: > 4.9 × 103kg/m3。
Detailed description of the invention
(a) is the micro-structure diagram of embodiment 1 in Fig. 1；It (b) is the micro-structure diagram of comparative example 1.
Specific embodiment
Below with reference to all attached drawings, the invention will be further described, referring to attached drawing 1, illustrates below according to specific embodiment
The present invention, but the present invention is not limited to these embodiments.
High B of the inventionsLow loss soft magnetic ferrite material is manufactured using conventional ceramic technique, and specific steps are successively as follows:
(1) it is formulated: being matched by table 1 (embodiment and comparative example) ingredient；
(2) primary to be sanded: use deionized water to carry out wet-mixing as solvent, each raw material being formulated above are sufficiently mixed
It closes uniformly, 10~30min of time is sanded；
(3) pre-burning: will be sanded material drying obtained by step (2), and 760~1000 DEG C pre-burning 1~3 hour；
(4) it adulterates: following accessory ingredient dopant, SiO will be added by weight in the Preburning material of step (3) production2: 0.00~
0.01wt%、CaCO3: 0.01~0.12wt%, ZrO2: 0.01~0.05wt%, Nb2O5: 0.01~0.03wt%, Ta2O5: 0.005
~0.02wt%；
(5) secondary sand milling: powder obtained by step (4) is then sanded 70~140 minutes with sand mill, partial size D50 is controlled:
0.50~1.60 μm；
(6) it forms: step (5) resulting slurry being subjected to spraying or mechanical equipment and is granulated, 0.01~0.02wt% of addition is stearic
Particulate material press compression moulding is corresponding product blank by sour zinc whole grain；
(7) it is sintered: step (6) products obtained therefrom blank being put into sintering in atmosphere furnace, in warming-up section, controls partial pressure of oxygen <
1.0vol% carries out N2Gas shielded dumping densification sintering, and keep the temperature 4~8 hours at 1345~1400 DEG C, oxygen when heat preservation
Partial pressure is 0.2~5vol%, is balanced atmosphere sintering in temperature descending section.
In a preferred embodiment, the primary sand milling time 15min, 930 DEG C pre-burning 3 hours, the secondary sand milling time
It is 100 minutes, controls partial size D50:1.30 μm, add 0.015wt% zinc stearate whole grain.In warming-up section, partial pressure of oxygen is controlled
0.2vol% carries out N2Gas shielded dumping densification sintering, and keep the temperature 6 hours at 1390 DEG C, partial pressure of oxygen when heat preservation are
2.6vol% is balanced atmosphere sintering in temperature descending section.
The magnet ring sample (T18 × 8 × 5) is made by the above process.
Sintered magnet ring is tested and evaluated.Under the conditions of the number of turns N=20Ts, surveyed with HP4284A LCR tester
Try the initial permeability μ of magnet ring samplei；Cooperate PHH-101 high-temperature test chamber, uses SY-8218 type B-H analyzer test sample
Power loss density PVWith saturation flux density Bs；With the density d of drainage test materialb。
The composition proportion of 1 embodiment and comparative example of table
The magnetic property of 2 embodiment and comparative example of table
Note: more than additional " ※ " of upper specification limit, more than additional " * " of lower specification limit.
Table 1 is the composition proportion of embodiment and comparative example, and table 2 lists the performance and evaluation of embodiment and comparative example.It is real
1~5 principal component of example and accessory ingredient are applied within the scope of the present invention limits, material performance index is completely up to standard.It is main in comparative example 1
If due to principal component Fe2O3Content is on the low side to cause superexchange interaction to weaken, and leads to saturation flux density BsIt is relatively low, originate magnetic conductance
Rate superelevation.Mainly due to principal component Fe in comparative example 22O3Content is on the high side, leads to Fe2+And Fe3+Between electron transition probability
Increase, resistivity reduces, and power loss density is bigger than normal.Again due to excessive Fe2+Ion pair K1Overcompensation is carried out, its increase is led
Cause initial permeability relatively low.Mainly since principal component NiO content is on the low side in comparative example 3, since the atomic weight of Ni is greater than Mn,
Deteriorate it can be seen that Ni very few in principal component replaces Mn that the density of material can be made to reduce overall performance.In comparative example 4 mainly due to
Principal component NiO content is on the high side, since NiO has biggish negative value magnetocrystalline anisotropy constant, power consumption valley point can be inhibited to low temperature
Direction is mobile, reduces the loss under high temperature.Again due to the relatively high high temperature that can also improve material of the Curie temperature of Ni ferrite
Bs, but adding excessive NiO can make two peaks mobile toward high temperature direction, cause initial permeability relatively low.In comparative example 5 mainly
Since principal component ZnO content is on the high side, Curie temperature reduction can be made to lead to saturation flux density BsIt is relatively low.
From Table 2, it can be seen that the embodiment of the present invention compares with comparative example, the present invention effectively improves material
Initial permeability μi, saturation flux density BsAnd firing density db, while also reducing power loss density PV.Such as Fig. 1 institute
Show, the crystallite dimension of embodiment 1 is 10~30 μm, stomata is less;The crystallite dimension of comparative example 1 is 40~60 μm, stomata is more.
Crystallite dimension refinement and the reduction of stomata are the one of the major reasons that material property improves.Material of the invention should be able to meet
Requirement of the power transformer to soft magnetic materials.
Specific embodiment described in the invention be only the present invention is given an example, the expert of correlative technology field or
Technical staff can make different degrees of modification to described specific embodiment, supplement or substituted with similar mode, but
Without departing from the spirit of the invention or going beyond the scope defined by the appended claims.
Claims (2)
1. a kind of high BsLow loss soft magnetic ferrite material, it is characterised in that:
Each major ingredient of soft magnetic ferrite includes: Fe2O3: 58.0~62.0mol%, ZnO:12.0~14.0mol%,
NiO:1.0~4.0mol%, surplus MnO；
By weight percentage, it and using the major ingredient after pre-burning as reference data, is calculated with oxide, dopant includes SiO2: 0.00~
0.01wt%, CaCO3: 0.01~0.12wt%, ZrO2: 0.01~0.05wt%, Nb2O5: 0.01~0.03wt%, Ta2O5: 0.005
~0.02wt%.
2. a kind of prepare high B as described in claim 1sThe method of low loss soft magnetic ferrite material, which is characterized in that including
Following steps:
(1) it is formulated: matching 58.0~62.0mol%Fe by following principal component2O3, 12.0~14.0mol%ZnO, 1.0~
The NiO of 4.0mol%, surplus MnO；
(2) primary to be sanded: to use deionized water to carry out wet-mixing as solvent, each raw material of step (1) are made with sand mill
It is sufficiently mixed uniformly, 10~30min of time is sanded；
(3) pre-burning: will be sanded material drying obtained by step (2), and 760~1000 DEG C pre-burning 1~3 hour；
(4) it adulterates: following accessory ingredient dopant, SiO will be added by weight in the Preburning material of step (3) production2: 0.00~
0.01wt%、CaCO3: 0.01~0.12wt%, ZrO2: 0.01~0.05wt%, Nb2O5: 0.01~0.03wt%, Ta2O5: 0.005
~0.02wt%；
(5) secondary sand milling: powder obtained by step (4) is then sanded 70~140 minutes with sand mill, partial size D50:0.50 is controlled
~1.60 μm；
(6) it forms: step (5) resulting slurry being subjected to spraying or mechanical equipment and is granulated, 0.01~0.02wt% of addition is stearic
Particulate material press compression moulding is corresponding product blank by sour zinc whole grain；
(7) it is sintered: step (6) products obtained therefrom blank being put into sintering in atmosphere furnace, in warming-up section, controls partial pressure of oxygen <
1.0vol% carries out N2Gas shielded dumping densification sintering, and keep the temperature 4~8 hours at 1345~1400 DEG C, oxygen when heat preservation
Partial pressure is 0.2~5vol%, is balanced atmosphere sintering in temperature descending section.
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| CN110171964A (en) * | 2019-04-23 | 2019-08-27 | 横店集团东磁股份有限公司 | A kind of high Bs high intensity MnZn ferrite material and preparation method thereof |
| CN111689770A (en) * | 2020-05-19 | 2020-09-22 | 天通控股股份有限公司 | High-temperature high-BsLow-loss soft magnetic ferrite material and preparation method thereof |
| WO2021128477A1 (en) * | 2019-12-26 | 2021-07-01 | 天通控股股份有限公司 | Manganese-zinc ferrite material having super-high saturation magnetic flux density and preparation method therefor |
| CN113480302A (en) * | 2021-09-03 | 2021-10-08 | 天通控股股份有限公司 | Wide-temperature-range high-permeability manganese-zinc soft magnetic ferrite for automotive electronics and preparation method thereof |
| CN113563062A (en) * | 2021-09-24 | 2021-10-29 | 天通控股股份有限公司 | Ultrahigh-frequency high-permeability low-loss manganese-zinc soft magnetic ferrite and preparation method thereof |
| CN113735574A (en) * | 2021-09-30 | 2021-12-03 | 海宁辉恒磁业有限公司 | Ultrahigh BsLow-loss manganese-zinc ferrite material and preparation method thereof |
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| WO2021128477A1 (en) * | 2019-12-26 | 2021-07-01 | 天通控股股份有限公司 | Manganese-zinc ferrite material having super-high saturation magnetic flux density and preparation method therefor |
| CN111689770A (en) * | 2020-05-19 | 2020-09-22 | 天通控股股份有限公司 | High-temperature high-BsLow-loss soft magnetic ferrite material and preparation method thereof |
| CN113480302A (en) * | 2021-09-03 | 2021-10-08 | 天通控股股份有限公司 | Wide-temperature-range high-permeability manganese-zinc soft magnetic ferrite for automotive electronics and preparation method thereof |
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| CN113735574A (en) * | 2021-09-30 | 2021-12-03 | 海宁辉恒磁业有限公司 | Ultrahigh BsLow-loss manganese-zinc ferrite material and preparation method thereof |
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