公开(公告)号：EP0628524B1

公开(公告)日：1998-05-13

申请号：EP94903093.6

申请日：1993-12-28

Applicant: TDK Corporation

Inventor： MATSUKAWA, Atsuhito ,  INOUE, Shoji

IPC: C04B35/38 ,  C04B35/26

CPC classification number: H01F1/344 ,  C04B35/2658

Abstract: The initial permeability of a manganese-zinc ferrite in the high-frequency zone of 10-500 Khz is improved by mixing a manganese-zinc ferrite comprising 50-56 mole % of Fe2O3, 22-39 mole % of Mno and 8-25 mole % of Zno with at most 800 ppm (in terms of Bi2O3) of bismuth oxide component and at most 1,200 ppm (in terms of MoO3) of molybdenum oxide component and firing the mixture. The mean crystal grain diameter is adjusted to 5-50 mu m or less.

公开(公告)号：EP0707323A1

公开(公告)日：1996-04-17

申请号：EP94914565.0

申请日：1994-04-27

Applicant: TDK Corporation

Inventor： YASUHARA, Katsushi ,  ITO, Takashi ,  TAKEDA, Osamu ,  INOUE, Shoji

IPC: H01F1/34 ,  C01G49/00 ,  C04B35/38

CPC classification number: H01F1/344 ,  C01G49/009 ,  C01P2002/32 ,  C01P2002/52 ,  C01P2004/02 ,  C01P2004/61 ,  C01P2006/42 ,  C04B35/2658

Abstract: A ferrite having low power losses, high ΔB = Bm - Br at high frequency, and improved µa-B properties is provided as well as a core for a power supply using the same. The ferrite contains 30-41 mol% of MnO, 6-16 mol% of ZnO, and the balance of Fe₂O₃ as main components and 50-250 ppm of SiO₂, 200-1500 ppm of CaO, up to 4000 ppm of SnO₂, up to 3000 ppm of TiO₂, at least 300 ppm of SnO₂ + TiO₂, from more than 0 to 500 ppm of Nb₂O₅, and from more than 0 to 400 ppm of ZrO₂ as subordinate components.

Abstract translation: 提供具有低功率损耗，高频率高ΔB= Bm-Br和提高的μa-B特性的铁氧体以及使用该铁氧体的电源的核心。 该铁氧体含有30-41摩尔％的MnO，6-16摩尔％的ZnO和余量的Fe 2 O 3作为主要成分和50-250ppm的SiO 2，200-1500ppm的CaO，最高达4000ppm的SnO 2， 至3000ppm的TiO 2，至少300ppm的SnO 2 + TiO 2，大于0至500ppm的Nb 2 O 5和大于0至400ppm的ZrO 2作为次要组分。

公开(公告)号：EP0628524A4

公开(公告)日：1995-09-13

申请号：EP94903093

申请日：1993-12-28

Applicant: TDK CORP

Inventor： MATSUKAWA ATSUHITO ,  INOUE SHOJI

IPC: C01G49/00 ,  C04B35/26 ,  C04B35/38 ,  H01F1/34

CPC classification number: H01F1/344 ,  C04B35/2658

Abstract: The initial permeability of a manganese-zinc ferrite in the high-frequency zone of 10-500 Khz is improved by mixing a manganese-zinc ferrite comprising 50-56 mole % of Fe2O3, 22-39 mole % of Mno and 8-25 mole % of Zno with at most 800 ppm (in terms of Bi2O3) of bismuth oxide component and at most 1,200 ppm (in terms of MoO3) of molybdenum oxide component and firing the mixture. The mean crystal grain diameter is adjusted to 5-50 mu m or less.

公开(公告)号：EP0201132B1

公开(公告)日：1991-08-14

申请号：EP86200754.9

申请日：1986-05-02

Applicant: North American Philips Corporation

Inventor： Wank, Larry Alan ,  Braitling, Joseph George ,  Kaczenski, Marie

IPC: C04B35/00 ,  C04B35/26 ,  C04B35/46 ,  C04B35/38 ,  C04B35/30

CPC classification number: C04B35/645 ,  C04B35/26 ,  C04B35/265 ,  C04B35/2658 ,  C04B35/465

公开(公告)号：EP0182406A1

公开(公告)日：1986-05-28

申请号：EP85201695.5

申请日：1985-10-16

Applicant: Philips Electronics N.V.

Inventor： Roelofsma, Johannus Josephus ,  Stijntjes, Theodorus Gerhardus Wilhelmus

IPC: C04B35/38

CPC classification number: C04B35/2658 ,  C04B35/265

Abstract: A ferromagnetic titanium-containing and cobalt-containing manganese-zinc-ferrite core which shows low power losses at high drive in a wide temperature range, characterized in that its composition essentially corresponds to the molecular formula

With V c = cation vacancy concentration

0.65 ≤ a ≤ 0.80
0.10 ≤ b ≤ 0.25
0.07 ≤ c ≤ 0.10
0.005 ≤ d ≤ 0.007
0.02 ≤ e ≤ 0.04
0.003≤x≤0.010
1.92 ≤f≤1.98
a+b+c+d-e+3x = 1; f+2e-2x = 2.

公开(公告)号：EP0071036A3

公开(公告)日：1983-12-14

申请号：EP82105907

申请日：1982-07-02

Applicant: GENERAL ELECTRIC COMPANY

Inventor： Gigl, Paul Donald

IPC: B01J03/06 ,  C04B35/38

CPC classification number: E21B10/5676 ,  B01J3/062 ,  B01J2203/062 ,  B01J2203/0645 ,  B01J2203/0655 ,  B01J2203/066 ,  B01J2203/0685 ,  C04B35/5831

Abstract: The improved process for making diamond and cubic boron nitride compacts comprises embedding within the mass of abrasive crystals (18) at least one partition strip (20) subdividing the abrasive crystal mass (18), which partition strip (20) is characterized by maintaining segregation between the separate portions of the abrasive crystal mass during step A and being sufficiently pliable no to resist the compaction of the abrasive crystal masses; subjecting a mass of abrasive crystals (18) selected from the group consisting of diamond, cubic boron nitride and mixtures thereof, which mass is in contact with a source of catalyst/ solvent for recrystallization of the abrasive crystals, to conditions of temperature, pressures and time which result in a compact having intercrystal bonding between adjacent crystal grains; recovering the compact produced; and removing substantially all of the metallic phase from the compact of step B.

公开(公告)号：EP4365149A1

公开(公告)日：2024-05-08

申请号：EP22897218.8

申请日：2022-08-04

Applicant: Hengdian Group DMEGC Magnetics Co., Ltd.

Inventor： ZHANG, Xiaohang ,  LV, Feiyu

IPC: C04B35/38 ,  C04B35/26 ,  C04B35/622 ,  H01F1/34 ,  H01F41/02

Abstract: A wide-temperature low-loss high-strength MnZn power ferrite, and a preparation method therefor and the use thereof. The wide-temperature low-loss high-strength MnZn power ferrite is comprised of a main component and an auxiliary component, wherein the mass of the auxiliary component is 0.165-0.61 wt% of the main component; the main component comprises iron oxide, manganese oxide and zinc oxide; and the auxiliary component comprises a first auxiliary component and a second auxiliary component, the first auxiliary component being cobalt oxide, and the second auxiliary component comprising at least three of calcium carbonate, niobium oxide, vanadium oxide and molybdenum oxide. By means of adding the auxiliary component, especially adding cobalt oxide with a specific mass, the cooperative adjustment of the specific ratio of Fe2+ to Co2+ is achieved, and power consumption is ensured to be effectively reduced without being influenced by temperature changes, such that the prepared wide-temperature low-loss high-strength MnZn power ferrite can have, at 25-120°C, the characteristics of low loss, a high magnetic flux density and an increase in strength by 10% or more.

公开(公告)号：EP2383241B1

公开(公告)日：2017-08-16

申请号：EP10735968.9

申请日：2010-01-29

Applicant: JFE Chemical Corporation

Inventor： YOSHIDA, Hirofumi ,  NAKAMURA, Yukiko ,  GOTO, Satoshi

IPC: C04B35/38 ,  C01G49/00 ,  H01F1/34 ,  H01F41/02

CPC classification number: H01F41/0246 ,  C01G49/0072 ,  C01G49/009 ,  C01P2002/52 ,  C01P2004/03 ,  C01P2004/61 ,  C01P2006/12 ,  C01P2006/40 ,  C01P2006/42 ,  C04B35/265 ,  C04B35/62695 ,  C04B2235/3208 ,  C04B2235/3244 ,  C04B2235/3251 ,  C04B2235/3262 ,  C04B2235/3275 ,  C04B2235/3284 ,  C04B2235/3418 ,  C04B2235/5409 ,  C04B2235/72 ,  C04B2235/724 ,  C04B2235/726 ,  C04B2235/727 ,  C04B2235/786 ,  C04B2235/96 ,  H01F1/344 ,  H01F1/36

公开(公告)号：EP3187475A1

公开(公告)日：2017-07-05

申请号：EP15835796.2

申请日：2015-08-31

Applicant: Hitachi Metals, Ltd.

Inventor： TADA, Tomoyuki ,  MIYOSHI, Yasuharu ,  KOYUHARA, Norikazu

IPC: C04B35/38 ,  H01F1/34

Abstract: Provided are: a MnZn-based ferrite which allows to have a low magnetic core loss and to suppress a time-dependent change of magnetic property under a high-temperature environment by a control of ambient oxygen concentration and an increase of the magnetic core loss, and a method for manufacturing the same. The MnZn-based ferrite is characterized in that Fe ranges from 53.25 mol% or more to 54.00 mol% or less on the basis of Fe 2 O 3 , Zn ranges from 2.50 mol% or more to 8.50 mol% or less on the basis of ZnO and Mn is the remainder on the basis of MnO, Si ranges from more than 0.001 mass% to less than 0.02 mass% on the basis of SiO 2 , Ca ranges from more than 0.04 mass% to less than 0.4 mass% on the basis of CaCO 3 , Co is less than 0.5 mass% on the basis of Co 3 O 4 , Bi is less than 0.05 mass% on the basis of Bi 2 O 3 , Ta is less than 0.05 mass% on the basis of Ta 2 O 5 , Nb is less than 0.05 mass% on the basis of Nb 2 O 5 , Ti is less than 0.3 mass% on the basis of TiO 2 , and Sn is less than 0.3 mass% on the basis of SnO 2 , and note that the converted total amount of Ta 2 O 5 and Nb 2 O 5 is less than 0.05 mass% and the converted total amount of TiO 2 and SnO 2 is less than 0.3 mass%.

Abstract translation: 本发明提供一种MnZn系铁氧体，其通过控制周围的氧浓度和磁芯损耗的增加，能够降低磁芯损耗，抑制高温环境下的磁特性随时间的变化， 及其制造方法。 MnZn系铁氧体的特征在于，Fe以Fe 2 O 3计为53.25摩尔％以上且54.00摩尔％以下，Zn以ZnO计为2.50摩尔％以上且8.50摩尔％以下 是以MnO为基准的余量，以SiO 2为基准计，Si的含量大于0.001质量％且小于0.02质量％，Ca以CaCO 3，Co为基准大于0.04质量％且小于0.4质​​量％ 以Co 3 O 4计低于0.5质量％，以Bi 2 O 3计，Bi低于0.05质量％，以Ta 2 O 5计低于0.05质量％，Nb以Nb 2 O 5计低于0.05质量％ ，基于TiO 2，Ti小于0.3质量％，以SnO 2计，Sn小于0.3质量％，并且注意到转化的Ta 2 O 5和Nb 2 O 5的总量小于0.05质量％，并且转化的总量 的TiO2和SnO2小于0.3质量％。

公开(公告)号：EP2383242A1

公开(公告)日：2011-11-02

申请号：EP10735969.7

申请日：2010-01-29

Applicant: JFE Chemical Corporation

Inventor： YOSHIDA, Hirofumi ,  NAKAMURA, Yukiko ,  GOTO, Satoshi

IPC: C04B35/38 ,  H01F1/34 ,  H01F3/08 ,  H01F41/02

CPC classification number: H01F41/0246 ,  C01G49/0072 ,  C04B35/2658 ,  C04B35/6262 ,  C04B35/62645 ,  C04B35/62655 ,  C04B35/62695 ,  C04B35/64 ,  C04B2235/3208 ,  C04B2235/3244 ,  C04B2235/3251 ,  C04B2235/3275 ,  C04B2235/3418 ,  C04B2235/604 ,  C04B2235/6567 ,  C04B2235/72 ,  C04B2235/724 ,  C04B2235/726 ,  C04B2235/727 ,  C04B2235/78 ,  C04B2235/786 ,  C04B2235/94 ,  C04B2235/945 ,  C04B2235/963 ,  C04B2235/9638 ,  H01F1/344 ,  H01F1/36 ,  H01F3/08

Abstract: A Mn-Zn ferrite core includes a basic component, sub-components, and unavoidable impurities, wherein, as the sub-components, silicon oxide (in terms of SiO 2 ): 50 to 400 mass ppm and calcium oxide (in terms of CaO): 50 to 4000 mass ppm are added to the basic component consisting of iron oxide (in terms of Fe 2 O 3 ): 51.0 to 54.5 mol%, zinc oxide (in terms of ZnO): 8.0 to 12.0 mol%, and manganese oxide (in terms of MnO): balance; amounts of phosphorus, boron, sulfur, and chlorine in the unavoidable impurities are reduced as follows, phosphorus: less than 3 mass ppm, boron: less than 3 mass ppm, sulfur: less than 5 mass ppm, and chlorine: less than 10 mass ppm; and a ratio of a measured specific surface of the Mn-Zn ferrite core to an ideal specific surface of the Mn-Zn ferrite core satisfies formula (1) below Measured specific surface / ideal specific surface 1500
where the measured specific surface represents a specific surface (m 2 /g) determined by a BET method (multipoint method) in JIS Z 8830 (2001); and the ideal specific surface represents a specific surface (m 2 /g) calculated from size and mass of the core on an assumption that the core is in an ideal state of having no cavities.
This Mn-Zn ferrite core has a higher incremental permeability µΔ at a high temperature and in a high magnetic field than existing Mn-Zn ferrite cores. The Mn-Zn ferrite core has excellent characteristics in which, under the application of a direct-current magnetic field of 80 A/m, the incremental permeability µΔ is continuously 400 or more in a wide temperature range of 0 to 85°C and the incremental permeability µΔ at 65°C is 700 or more.

Abstract translation: Mn-Zn铁氧体磁芯包括碱性组分，亚组分和不可避免的杂质，其中作为副组分，氧化硅（以SiO 2计）：50-400ppmppm和氧化钙（以CaO计） ）：由氧化铁（以Fe 2 O 3计）构成的碱性成分中添加50〜4000质量ppm：51.0〜54.5摩尔％，氧化锌（ZnO换算）：8.0〜12.0摩尔％，锰 氧化物（以MnO计）：平衡; 不可避免的杂质中的磷，硼，硫和氯的量如下降低：磷：小于3质量ppm，硼：小于3质量ppm，硫：小于5质量ppm，氯：小于10质量 PPM; 并且Mn-Zn铁氧体磁心的测定的比表面与Mn-Zn铁氧体磁心的理想比表面的比例满足下述式（1）。测定的比表面积/理想比表面<1500，其中测得的比表面积为 JIS Z 8830（2001）中通过BET法（多点法）测定的表面（m 2 / g） 而理想的比表面则表示从芯的大小和质量计算的比表面积（m 2 / g），假设芯处于没有空腔的理想状态。 该Mn-Zn铁氧体磁心在高温和高磁场下具有比现有Mn-Zn铁氧体磁芯更高的增量磁导率μ“。 Mn-Zn铁氧体磁芯具有优异的特性，其中在80A / m的直流磁场的应用下，增量磁导率μ“在0〜85℃的宽温度范围内连续地为400以上， 65℃下的增量磁导率μ“为700以上。