公开(公告)号：US20110227679A1

公开(公告)日：2011-09-22

申请号：US13046307

申请日：2011-03-11

申请人： Masahito KOEDA ,  Tomofumi KURODA ,  Tomokazu ISHIKURA ,  Akihiro HARADA ,  Hiroyuki ONO ,  Osamu KIDO ,  Satoko UEDA

发明人： Masahito KOEDA ,  Tomofumi KURODA ,  Tomokazu ISHIKURA ,  Akihiro HARADA ,  Hiroyuki ONO ,  Osamu KIDO ,  Satoko UEDA

IPC分类号： H01F3/08 ,  B22F1/00

CPC分类号： H01F3/08 ,  B22F1/0003 ,  B22F2301/35 ,  B22F2303/01 ,  B22F2304/10 ,  H01F1/26 ,  H01F41/0246

摘要： The present invention provides a powder magnetic core low in the loss and high in the saturation magnetic flux density and a method for manufacturing the same. More specifically, the present invention provides a powder magnetic core that comprises a soft magnetic metal powder having an average particle size (D50) of 0.5 to 5 μm, a half width of diffraction peak in a direction of α-Fe as measured by X-ray powder diffraction of 0.2 to 5.0°, and an Fe content of 97.0% by mass or more, the core having an oxygen content of 2.0% by mass or more.

摘要翻译： 本发明提供一种低损耗，高饱和磁通密度的粉末磁芯及其制造方法。 更具体地，本发明提供一种粉末磁芯，其包含平均粒径（D50）为0.5〜5μm的软磁性金属粉末，测定的α-Fe的<110℃方向的衍射峰的半值宽度 核的氧含量为2.0质量％以上，X射线粉末衍射为0.2〜5.0°，Fe含量为97.0质量％以上。

公开(公告)号：US20120229354A1

公开(公告)日：2012-09-13

申请号：US13351722

申请日：2012-01-17

申请人： Tomokazu ISHIKURA ,  Michihiro MURAMOTO ,  Akihiro HARADA ,  Katsumi KAWASAKI ,  Tomofumi KURODA

发明人： Tomokazu ISHIKURA ,  Michihiro MURAMOTO ,  Akihiro HARADA ,  Katsumi KAWASAKI ,  Tomofumi KURODA

IPC分类号： H01Q1/00

CPC分类号： H01F1/10 ,  C04B35/2633 ,  C04B35/2641 ,  C04B35/2683 ,  C04B35/62685 ,  C04B38/00 ,  C04B2111/00844 ,  C04B2235/3206 ,  C04B2235/3208 ,  C04B2235/3213 ,  C04B2235/3215 ,  C04B2235/3217 ,  C04B2235/3224 ,  C04B2235/3232 ,  C04B2235/3241 ,  C04B2235/3244 ,  C04B2235/3263 ,  C04B2235/3272 ,  C04B2235/3275 ,  C04B2235/3279 ,  C04B2235/3281 ,  C04B2235/3284 ,  C04B2235/3286 ,  C04B2235/3293 ,  C04B2235/3298 ,  C04B2235/3418 ,  C04B2235/767 ,  C04B2235/786 ,  H01Q1/243 ,  H01Q1/364 ,  H01Q5/00 ,  H01Q9/42 ,  C04B35/26

摘要： A magnetic material for antennas including: an M-type hexagonal ferrite represented by the following general formula (1) as a main phase, MA.Fe12-x.MBx.O19 (wherein MA is at least one kind selected from the group consisting of Sr and Ba, MB is MC or MD, MC is at least one kind selected from the group consisting of Al, Cr, Sc and In, MD is an equivalent mixture of at least one kind selected from the group consisting of Ti, Sn and Zr and at least one kind selected from the group consisting of Ni, Zn, Mn, Mg, Cu and Co, X is a number from 1 to 5), and an average crystal particle diameter is equal to or greater than 5 μm.

摘要翻译： 一种用于天线的磁性材料，包括：作为主相的由以下通式（1）表示的M型六方晶系铁氧体：MA.Fe12-x.MBx.O19（其中MA是选自以下的至少一种： Sr和Ba，MB是MC或MD，MC是选自Al，Cr，Sc和In中的至少一种，MD是选自Ti，Sn和 Zr和选自Ni，Zn，Mn，Mg，Cu和Co中的至少一种，X为1至5的数），平均晶体粒径等于或大于5μm。

公开(公告)号：US20110101262A1

公开(公告)日：2011-05-05

申请号：US12896252

申请日：2010-10-01

申请人： Tomofumi KURODA ,  Masahito KOEDA

发明人： Tomofumi KURODA ,  Masahito KOEDA

IPC分类号： H01F1/06 ,  H01F1/26

CPC分类号： H01F3/08 ,  B22F1/0085 ,  B22F1/0088 ,  B22F1/0096 ,  B22F1/02 ,  H01F1/24 ,  H01F1/26 ,  H01F41/0246

摘要： The invention provides surface-treated reduced iron powder from which a powder magnetic core can be produced so that the powder magnetic core has small core loss and small frequency-dependence of the core loss and exhibits small core loss even when driven at high frequencies of 1 MHz or more. The surface-treated reduced iron powder is obtained by at least surface-treating reduced iron powder prepared by a reduction and slow oxidation method, and contains secondary particles formed through agglomeration of primary particles, the primary particles having an average particle diameter of 0.01-5 μm. The secondary particles have a D90% particle diameter of 20 μm or less, the surface of the primary particles is at least in part coated with an insulating layer containing iron phosphate, and the phosphorus content is 500-10000 ppm.

摘要翻译： 本发明提供经表面处理的还原铁粉，由此可以制造粉末磁芯，使得粉末磁芯具有较小的磁芯损耗和较小的磁芯损耗的频率依赖性，并且即使在高频率1 MHz以上。 表面处理的还原铁粉末通过至少对通过还原和缓慢氧化法制备的还原铁粉进行表面处理而获得，并且包含通过初级颗粒附聚形成的二次颗粒，一次颗粒的平均粒径为0.01-5 μm。 二次粒子的D90％粒径为20μm以下，一次粒子的表面至少部分地涂覆有含有磷酸铁的绝缘层，磷含量为500〜100ppm。

公开(公告)号：US20080236706A1

公开(公告)日：2008-10-02

申请号：US12053082

申请日：2008-03-21

申请人： Shenglei CHE ,  Kentaro MORI ,  Masahiko WATANABE ,  Takuya AOKI ,  Tomofumi KURODA

发明人： Shenglei CHE ,  Kentaro MORI ,  Masahiko WATANABE ,  Takuya AOKI ,  Tomofumi KURODA

IPC分类号： C21D6/00

CPC分类号： H01F1/344 ,  C01G49/0018 ,  C01G49/009 ,  C01G53/006 ,  C01P2002/52 ,  C01P2006/80 ,  C04B35/265 ,  C04B35/6262 ,  C04B35/62695 ,  C04B2235/3203 ,  C04B2235/3208 ,  C04B2235/3239 ,  C04B2235/3244 ,  C04B2235/3251 ,  C04B2235/3262 ,  C04B2235/3279 ,  C04B2235/3284 ,  C04B2235/3298 ,  C04B2235/3418 ,  C04B2235/5427 ,  C04B2235/656 ,  C04B2235/6562 ,  C04B2235/6565 ,  C04B2235/6584

摘要： Firing is carried out such that for operation of a partial pressure of oxygen and temperature at the high-temperature holding operation phase and cooling operation phase, the following equilibrium relation equation (1) indicative of an equilibrium relation of a partial pressure of oxygen (PO2 in %) to a temperature (T in absolute temperature K) is used to set the values of a and b at given values of a=a* and b=b*, respectively, Log(PO2)=a−b/T   Eq. (1) and Log(PO2)=a*−b*/T that is a basic relation equation for operation of the partial pressure oxygen (PO2) and temperature (T) is fixed as an basic equation for operation; the partial pressure of oxygen (PO2) at the high-temperature holding operation phase is operated at a partial pressure of oxygen p2 that is higher than the value of an equilibrium partial pressure of oxygen PO2=p1 determined from an equilibrium relation to temperature based on the basic equation for operation Log(PO2)=a*−b*/T: p2>p1; and the partial pressure of oxygen (PO2) at the cooling operation phase is operated at an equilibrium partial pressure of oxygen determined from an equilibrium relation to temperature based on the basic equation Log(PO2)=a*−b*/T. It is thus possible to obtain a MnZn-base ferrite having well-balanced properties: high saturation flux density and low core loss.

摘要翻译： 进行烧结，使得在高温保持运转阶段和冷却运转阶段运行氧气和温度的运转，指示氧分压（PO）的平衡关系的以下平衡关系式（1） 使用％）至温度（绝对温度T下的T）用于将a和b的值分别设定为a = a *和b = b *的给定值< -line-formula description =“In-line Formulas”end =“lead”？> Log（PO＆lt; 2＆gt;）= ab / T Eq。 （1）<？in-line-formula description =“In-line Formulas”end =“tail”？>和Log（PO _{2 ）= a * -b * / T， 用于操作分压氧（PO 2 2）和温度（T）的关系式被定为操作的基本方程; 在高温保持操作阶段的氧气分压（PO 2 H 2）在氧气p 2的分压下操作，其比氧的平衡分压值PO p 1，从与温度的平衡关系确定的> 2 = p 1。 并且在冷却操作阶段的氧气分压（PO 2 H 2）基于从基本方程Log（PO 2）的平衡关系确定的氧平衡分压 ）= a * -b * / T。 因此，可以获得具有良好平衡特性的MnZn基铁氧体：高饱和磁通密度和低磁芯损耗。}