CN1411008A - Low temperature sintered very high frequency laminated sheet type electrical inductance, sheet type magnetic beal material and its preparation method - Google Patents
Low temperature sintered very high frequency laminated sheet type electrical inductance, sheet type magnetic beal material and its preparation method Download PDFInfo
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- CN1411008A CN1411008A CN 02153785 CN02153785A CN1411008A CN 1411008 A CN1411008 A CN 1411008A CN 02153785 CN02153785 CN 02153785 CN 02153785 A CN02153785 A CN 02153785A CN 1411008 A CN1411008 A CN 1411008A
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- 239000000463 material Substances 0.000 title claims abstract description 43
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims description 11
- 238000005245 sintering Methods 0.000 claims abstract description 25
- 239000011324 bead Substances 0.000 claims abstract description 20
- 238000009766 low-temperature sintering Methods 0.000 claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 14
- 230000035699 permeability Effects 0.000 claims abstract description 10
- 229910000859 α-Fe Inorganic materials 0.000 claims description 22
- 239000000843 powder Substances 0.000 claims description 21
- 238000000498 ball milling Methods 0.000 claims description 16
- 230000001939 inductive effect Effects 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- 206010037660 Pyrexia Diseases 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 7
- 150000001875 compounds Chemical class 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 5
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
- 238000005469 granulation Methods 0.000 claims description 5
- 230000003179 granulation Effects 0.000 claims description 5
- 239000004615 ingredient Substances 0.000 claims description 5
- 239000012071 phase Substances 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 238000010532 solid phase synthesis reaction Methods 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 abstract 2
- WMWLMWRWZQELOS-UHFFFAOYSA-N bismuth(iii) oxide Chemical compound O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 abstract 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 abstract 1
- 229910001634 calcium fluoride Inorganic materials 0.000 abstract 1
- UBEWDCMIDFGDOO-UHFFFAOYSA-N cobalt(II,III) oxide Inorganic materials [O-2].[O-2].[O-2].[O-2].[Co+2].[Co+3].[Co+3] UBEWDCMIDFGDOO-UHFFFAOYSA-N 0.000 abstract 1
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 239000002131 composite material Substances 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 239000013078 crystal Substances 0.000 abstract 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract 1
- HTUMBQDCCIXGCV-UHFFFAOYSA-N lead oxide Chemical compound [O-2].[Pb+2] HTUMBQDCCIXGCV-UHFFFAOYSA-N 0.000 abstract 1
- YEXPOXQUZXUXJW-UHFFFAOYSA-N lead(II) oxide Inorganic materials [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910000018 strontium carbonate Inorganic materials 0.000 abstract 1
- LEDMRZGFZIAGGB-UHFFFAOYSA-L strontium carbonate Chemical compound [Sr+2].[O-]C([O-])=O LEDMRZGFZIAGGB-UHFFFAOYSA-L 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 238000001228 spectrum Methods 0.000 description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- 230000003595 spectral effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005294 ferromagnetic effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
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- Soft Magnetic Materials (AREA)
- Magnetic Ceramics (AREA)
Abstract
The VHF slice type inductance and the slice type bead material are obtained by sintering the admixture of BaSrPbZnCoCu and the sintering supporting agent being mixed according to certain weight percentage rate. Fe2O3, BaCO3, SrCO3, PbO, Co3O4 etc. are used as the main materials to prepare BaSrPbZnCoCu. The composite sintering supporting agent is prepared from Bi2O3+Al2O3+PbO+B2O3+SiO2+CaF2+LiF. The material possesses the properties of magnetic permeability 2-40, cut-off frequency 800 MHz to more than 1.8 GHz, the variety rate of specific temperature less than 10 to the power -6/deg.C and resistivity larger than 10 to the power 9 ohm.cm. The invention realizes the low temperature sintering, providing the features of high density, the even size of crystal grain and the stable performance.
Description
Technical field
The invention belongs to the inductive material preparing technical field, particularly a kind of low-temperature sintering VHF laminated inductive, chip magnetic bead material and preparation method thereof.
Background technology
The process technology key of laminated inductive class component and difficult point are the common burnings of magnetic media material and inner electrode.Consider that from conductivity, oxidative resistance and three aspects of cost electrocondution slurry is generally selected silver paste, but silver point have only 961 ℃.This just requires the ferrite soft magnetic dielectric material when having high magnetic permeability and high quality factor, and sintering temperature must be lower than 900 ℃.At present, along with development of electronic technology, the application band of electronic circuit is more and more higher, has reached the GHz level, and this just requires the frequency of utilization of corresponding electronic element also will improve thereupon.At present, the inductive material of domestic and international application mainly is the NiZnCu ferrite, but its maximum useful frequency has only 100MHz, can't be applied to VHF band.At present, be badly in need of a kind of VHF band that can be applied to and have high magnetic permeability, high quality factor, the soft magnetic material of sintering temperature and low.
Summary of the invention
The objective of the invention is to propose a kind of low-temperature sintering VHF laminated inductive, chip magnetic bead material and preparation method thereof, this kind material has the cut-off frequency height, the use frequency range is wide, has high magnetic permeability at VHF band, high quality factor, and its sintering temperature is low, it is characterized in that: it is that major ingredient is a Y-type BaSrPbZnCoCu plane hexagonal soft magnetic ferrite that the prescription of described low-temperature sintering very high frequency(VHF) chip inductor, chip magnetic bead material is formed, and auxiliary material is Bi
2O
3+ Al
2O
3+ PbO+B
2O
3+ SiO
2+ CaF
2The compound low fever's sintering agent of+LiF, the shared percentage by weight of major ingredient is 95-100% in the prescription, auxiliary material sintering agent content is 0-5%.
The preparation technology of described low-temperature sintering very high frequency(VHF) chip inductor, chip magnetic bead material comprises the steps:
1) solid phase synthesis of plane hexagonal soft magnetic ferrite powder:
1. take by weighing an amount of initial feed, wherein Fe by stoichiometric proportion
2O
3: BaCO
3: SrCO
3: Co
3O
4: ZnO:
CuO＝1∶(0～0.4)∶(0～0.4)∶(0～0.14)∶(0～0.4)∶(0～0.4)
2. the raw material ball milling being mixed 24 hours, is medium with absolute ethyl alcohol or deionized water;
3. the slurry behind the ball milling is crossed 200 mesh sieves in 70-100 ℃ of oven dry;
4. the powder after will sieving places high-temperature electric resistance furnace in 900-1100 ℃ of pre-burning, is incubated 2-6 hour, can obtain pure single-phase Y-type plane hexagonal soft magnetic ferrite powder;
2) chip inductor or magnetic bead forming materials:
1. the compound low fever's sintering agent 0～5% of auxiliary material that in gained Y-type ferrite powder, adds mixed in equal amounts
2. will go up step gained powder ball milling and mix 24 hours, be medium with absolute ethyl alcohol or deionized water;
3. with the ball milling slurry in 70-100 ℃ of oven dry, 200 orders that sieve, granulation, moulding;
4. the moulding sample that will go up the step gained in 850-920 ℃ of sintering 0.5-10 hour, promptly gets low-temperature sintering very high frequency(VHF) chip inductor, magnetic bead material that BaSrPbZnCoCu of the present invention plane hexagonal soft magnetic ferrite is formed in high-temperature electric resistance furnace.
The invention has the beneficial effects as follows that Y-type BaSrPbZnCoCu plane its prescription of hexagonal soft magnetic ferrite that adopts the low-temperature sintering method to obtain is adjustable, sintering temperature is low, firing temperature is wide, the preparation method is simple, technological parameter is controlled easily, be suitable for suitability for industrialized production, stable performance, good reliability, material performance index height.Structural anisotropy, cut-off frequency exceeds an order of magnitude than NiZnCu structural iron oxysome, and magnetic permeability is at 2-40, and the very high frequency(VHF) chip inductor of its preparation, the cut-off frequency of magnetic bead material are more than the 800MHz to 1.8GHz, to be not more than 10 than rate of temperature change
-6/ ℃, resistivity is greater than 10
9Ω cm satisfies the requirement of very high frequency(VHF) chip inductor, magnetic bead material fully, is with a wide range of applications and huge economic benefit.
Description of drawings
Fig. 1 is the magnetic spectral characteristic graph of the embodiment of the invention 1 sample;
Fig. 2 is the quality factor performance diagram of the embodiment of the invention 1 sample;
Fig. 3 is the magnetic spectral characteristic graph of the embodiment of the invention 2 samples;
Fig. 4 is the quality factor performance diagram of the embodiment of the invention 2 samples.
Embodiment
The present invention is a kind of low-temperature sintering VHF laminated inductive, chip magnetic bead material and preparation method thereof.This kind material has the cut-off frequency height, uses frequency range wide, has high magnetic permeability at VHF band, the characteristics of high quality factor, and also its sintering temperature is also lower, satisfies the requirement of high reliability very high frequency(VHF) inductive material; With Fe
2O
3, BaCO
3, SrCO
3, PbO, Co
3O
4, ZnO, CuO be that main material prepares BaSrPbZnCoCu plane hexad ferrite, with auxiliary material B i
2O
3+ Al
2O
3+ PbO+B
2O
3+ SiO
2+ CaF
2+ LiF is compound low fever's sintering agent, and the shared percentage by weight of major ingredient is 95-100%, and auxiliary material sintering agent content is 0-5%.
Its step of preparation process is as follows:
1) solid phase synthesis of plane hexagonal soft magnetic ferrite powder:
1. take by weighing an amount of initial feed, wherein Fe by stoichiometric proportion
2O
3: BaCO
3: SrCO
3: Co
3O
4: ZnO: CuO=1: (0～0.4): (0～0.4): (0～0.14): (0～0.4): (0～0.4)
2. the raw material ball milling being mixed 24 hours, is medium with absolute ethyl alcohol or deionized water;
3. the slurry behind the ball milling is crossed 200 mesh sieves in 70-100 ℃ of oven dry;
4. the powder after will sieving places high-temperature electric resistance furnace in 900-1100 ℃ of pre-burning, is incubated 2-6 hour, can obtain pure single-phase Y-type plane hexagonal soft magnetic ferrite powder;
2) chip inductor or magnetic bead forming materials:
1. the compound low fever's sintering agent 0～5% of auxiliary material that in gained Y-type ferrite powder, adds mixed in equal amounts;
2. will go up step gained powder ball milling and mix 24 hours, be medium with absolute ethyl alcohol or deionized water;
3. with the ball milling slurry in 70-100 ℃ of oven dry, cross 200 mesh sieves, granulation, moulding;
4. the moulding sample that will go up the step gained in 850-920 ℃ of sintering 0.5-10 hour, promptly gets low-temperature sintering very high frequency(VHF) chip inductor of the present invention, the magnetic bead material be made up of BaSrPbZnCoCu plane hexagonal soft magnetic ferrite in high-temperature electric resistance furnace.
Further specify the inventive method for embodiment more below.
Embodiment 1, adopts analytically pure Fe
2O
3, BaCO
3, SrCO
3, PbO, Co
3O
4, ZnO, CuO be initial feed, Fe in molar ratio
2O
3: BaCO
3: SrCO
3: PbO: Co
3O
4: ZnO: CuO=1: 0.2: 0.1: 0.09: take by weighing at 0.1: 0.24: 0.12, mixed 24 hours for the medium ball milling with the absolute ethyl alcohol, 70～100 ℃ of oven dry, cross 200 mesh sieves, 1000 ℃, 1050 ℃, 1100 ℃ pre-burnings, be incubated 6 hours, 4 hours, 2 hours, obtain pure single-phase Y-type soft ferromagnetic powder; Gained Y-type ferrite powder be Bi with the raw material
2O
3+ Al
2O
3+ PbO+B
2O
3+ SiO
2+ CaF
2Compound low fever's sintering agent of+LiF mixed in equal amounts, by mixed with the weight ratio 5%, 3%, 1% of ferrite powder weight, ball milling 24 hours, oven dry is sieved, granulation, moulding, respectively at 850 ℃, 890 ℃ and 920 ℃ of sintered heat insulatings 10 hours, 6 hours, 0.5 hour, note is made sample 1-1,1-2 and 1-3.The external diameter 20mm of annular sample, internal diameter 10mm, thickness 2.5mm, briquetting pressure 7MPa; The diameter 10mm of sheet sample, thickness 1mm, briquetting pressure 2MPa.Sheet sample upper and lower surface after burning till is measured its resistivity after by silver.Ring-type sample after burning till is measured magnetic frequency spectrum and dielectric spectra with HP4291B (1M-1.8GHz) radio-frequency (RF) impedance analyzer.Fig. 1 has provided the magnetic spectral characteristic curve of sample, and quality factor are seen shown in Figure 2.The performance parameter of the sample that obtains sees Table 1.
Table 1:
| Sample number into spectrum | Initial permeability | Resistivity (Ω cm) | Than temperature coefficient (/ ℃) | Quality factor |
| ????1-1 | ????4.8 | ????1.67×10 9 | ????1.18×X10 -7 | ????65 |
| ????1-2 | ????5.7 | ????3.67×10 9 | ????2.63×10 -7 | ????60 |
| ????1-3 | ????5.6 | ????5.10×10 9 | ????5.82×10 -7 | ????100 |
Embodiment 2, adopt analytically pure Fe
2O
3, BaCO
3, SrCO
3, PbO, Co
3O
4, ZnO, CuO be initial feed, Fe in molar ratio
2O
3: BaCO
3: SrCO
3: PbO: Co
3O
4: ZnO: CuO=1: 0.3: 0.05: 0.01: take by weighing at 0.13: 0.1: 0.22, mixed 24 hours for the medium ball milling with the absolute ethyl alcohol, oven dry, cross 200 mesh sieves, in 900 ℃, 950 ℃, 1000 ℃, 1050 ℃ pre-burnings, be incubated 6 hours, 4 hours, 3 hours, 2 hours, obtain pure single-phase Y-type soft ferromagnetic powder.The gained ferrite powder be Bi with the raw material
2O
3+ Al
2O
3+ PbO+B
2O
3+ SiO
2+ CaF
2Compound low fever's sintering agent of+LiF mixed in equal amounts, 5%, 4%, 2%, 1% mixed by with the weight ratio of ferrite powder weight, ball milling 24 hours, oven dry is sieved, granulation, moulding, respectively at 850 ℃, 870 ℃, 900 ℃ and 920 ℃ of sintered heat insulatings 10 hours, 6 hours, 4 hours, 0.5 hour, note is made sample 2-1,2-2,2-3 and 2-4.The external diameter 20mm of annular sample, internal diameter 10mm, thickness 2.5mm, briquetting pressure 7MPa; The diameter 10mm of sheet sample, thickness 1mm, briquetting pressure 2MPa.Sheet sample upper and lower surface after burning till is measured its resistivity after by silver.Ring-type sample after burning till is measured magnetic frequency spectrum and dielectric spectra with HP4291B (1M-1.8GHz) radio-frequency (RF) impedance analyzer.Fig. 1 has provided the magnetic spectral characteristic curve of sample, and quality factor are seen shown in Figure 2.The performance parameter of the sample that obtains sees Table 2.
Table 2:
| Sample number into spectrum | Initial permeability | Resistivity (Ω cm) | Than temperature coefficient (/ ℃) | Quality factor |
| ????2-1 | ????7.8 | ????5.69×10 9 | ????1.79×10 -7 | ????300 |
| ????2-2 | ????5.6 | ????5.29×10 9 | ????2.35×10 -7 | ????70 |
| ????2-3 | ????3.9 | ????4.54×10 9 | ????3.64×10 -7 | ????90 |
| ????2-4 | ????2.7 | ????2.10×10 9 | ????2.96×10 -7 | ????100 |
Above-mentioned example explanation, by the adjustment of prescription and technology, the present invention has obtained high performance low-temperature sintered VHF chip inductor and magnetic bead material.Add a small amount of sintering agent, realized low-temperature sintering, the material sintering character is good, density height, even grain size.The magnetic permeability of material more than the cut-off frequency 800MHz to 1.8GHz, is not more than 10 than rate of temperature change at 2-40
-6/ ℃, resistivity is greater than 10
9Ω cm, and experiment shows that material property of the present invention is stable, and reproducibility is good.
Claims (2)
1. a low-temperature sintering VHF laminated inductive, chip magnetic bead material, this kind material has the cut-off frequency height, the use frequency range is wide, has high magnetic permeability at VHF band, high quality factor, and its sintering temperature is low, it is characterized in that: it is that major ingredient is a BaSrPbZnCoCu plane hexagonal soft magnetic ferrite that the prescription of described low-temperature sintering very high frequency(VHF) chip inductor, chip magnetic bead material is formed, and auxiliary material is Bi
2O
3+ Al
2O
3+ PbO+B
2O
3+ SiO
2+ CaF
2The compound low fever's sintering agent of+LiF; The shared percentage by weight of major ingredient is 95-100% in the prescription, and auxiliary material sintering agent content is 0-5%.
2. a low-temperature sintering VHF laminated inductive, chip magnetic bead preparation methods, it is characterized in that: the preparation technology of described low-temperature sintering very high frequency(VHF) chip inductor, chip magnetic bead material comprises the steps:
1) solid phase synthesis of plane hexagonal soft magnetic ferrite powder:
1. take by weighing an amount of initial feed, wherein Fe by stoichiometric proportion
2O
3: BaCO
3: SrCO
3: Co
3O
4: ZnO: CuO=1: (0～0.4): (0～0.4): (0～0.14): (0～0.4): (0～0.4)
2. the raw material ball milling being mixed 24 hours, is medium with absolute ethyl alcohol or deionized water;
3. the slurry behind the ball milling is crossed 200 mesh sieves in 70-100 ℃ of oven dry;
4. the powder after will sieving places high-temperature electric resistance furnace in 900-1100 ℃ of pre-burning, is incubated 2-6 hour, can obtain pure single-phase Y-type plane hexagonal soft magnetic ferrite powder;
2) chip inductor or magnetic bead forming materials:
1. the compound low fever's sintering agent 0～5% of auxiliary material that in gained Y-type ferrite powder, adds mixed in equal amounts
2. will go up step gained powder ball milling and mix 24 hours, be medium with absolute ethyl alcohol or deionized water;
3. with the ball milling slurry in 70-100 ℃ of oven dry, 200 orders that sieve, granulation, moulding;
4. the moulding sample that will go up the step gained in 850-920 ℃ of sintering 0.5-10 hour, promptly gets low-temperature sintering very high frequency(VHF) chip inductor, magnetic bead material that BaSrPbZnCoCu of the present invention plane hexagonal soft magnetic ferrite is formed in high-temperature electric resistance furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021537852A CN1191594C (en) | 2002-12-06 | 2002-12-06 | Low temperature sintered very high frequency laminated sheet type electrical inductance, sheet type magnetic beal material and its preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021537852A CN1191594C (en) | 2002-12-06 | 2002-12-06 | Low temperature sintered very high frequency laminated sheet type electrical inductance, sheet type magnetic beal material and its preparation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1411008A true CN1411008A (en) | 2003-04-16 |
| CN1191594C CN1191594C (en) | 2005-03-02 |
Family
ID=4752362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021537852A Expired - Fee Related CN1191594C (en) | 2002-12-06 | 2002-12-06 | Low temperature sintered very high frequency laminated sheet type electrical inductance, sheet type magnetic beal material and its preparation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1191594C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102082019A (en) * | 2010-12-01 | 2011-06-01 | 深圳市麦捷微电子科技股份有限公司 | Power inductor and manufacturing method thereof |
| CN102682953A (en) * | 2012-05-28 | 2012-09-19 | 深圳顺络电子股份有限公司 | Common mode filter |
| CN101998934B (en) * | 2008-10-02 | 2013-01-23 | 首尔大学校产学协力团 | Multiferroic material and method of manufacturing the same |
| CN112645614A (en) * | 2020-12-23 | 2021-04-13 | 钢铁研究总院 | Glass welding method for sintered samarium-cobalt permanent magnet |
| CN113248245A (en) * | 2021-06-05 | 2021-08-13 | 合泰盟方电子（深圳）股份有限公司 | Material for very high frequency laminated inductor and preparation method thereof |
| CN114874005A (en) * | 2022-06-10 | 2022-08-09 | 安徽理工大学 | Temperature-stable magnesium titanate base microwave dielectric composite ceramic and preparation method thereof |
-
2002
- 2002-12-06 CN CNB021537852A patent/CN1191594C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101998934B (en) * | 2008-10-02 | 2013-01-23 | 首尔大学校产学协力团 | Multiferroic material and method of manufacturing the same |
| US8597533B2 (en) | 2008-10-02 | 2013-12-03 | Snu R&Db Foundation | Multiferroic material and method of manufacturing the same |
| CN102082019A (en) * | 2010-12-01 | 2011-06-01 | 深圳市麦捷微电子科技股份有限公司 | Power inductor and manufacturing method thereof |
| CN102682953A (en) * | 2012-05-28 | 2012-09-19 | 深圳顺络电子股份有限公司 | Common mode filter |
| CN112645614A (en) * | 2020-12-23 | 2021-04-13 | 钢铁研究总院 | Glass welding method for sintered samarium-cobalt permanent magnet |
| CN113248245A (en) * | 2021-06-05 | 2021-08-13 | 合泰盟方电子（深圳）股份有限公司 | Material for very high frequency laminated inductor and preparation method thereof |
| CN114874005A (en) * | 2022-06-10 | 2022-08-09 | 安徽理工大学 | Temperature-stable magnesium titanate base microwave dielectric composite ceramic and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1191594C (en) | 2005-03-02 |
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