公开(公告)号：US07241501B2

公开(公告)日：2007-07-10

申请号：US10991511

申请日：2004-11-19

申请人： Kenji Masada ,  Takafumi Amino ,  Akira Nagatomi

发明人： Kenji Masada ,  Takafumi Amino ,  Akira Nagatomi

IPC分类号： B32B5/16

CPC分类号： C01B21/0622 ,  B82Y30/00 ,  C01P2004/64 ,  C01P2006/37 ,  C01P2006/42 ,  G11B5/70626 ,  H01F1/065 ,  Y10T428/12181 ,  Y10T428/2982 ,  Y10T428/2991 ,  Y10T428/2993 ,  Y10T428/2995

摘要： An iron nitride magnetic powder comprised primarily of Fe16N2 phase is characterized in that its coercive force Hc is 200 KA/m or greater and bulk switching field distribution BSDF is 2 or less. The magnetic powder can be produced by allowing a nitriding reaction of Fe particles with a nitrogen-containing gas for producing nitrided particles of primarily Fe16N2 phase to proceed under an increased pressure of 0.1 MPa or greater. The enhanced properties of the iron nitride magnetic powder make it suitable as a magnetic material for high-density magnetic recording media.

摘要翻译： 主要由Fe 11 N 2 N 2相组成的氮化铁磁粉的特征在于其矫顽力Hc为200KA / m以上，体积切换场分布BSDF为2 或更少。 可以通过使Fe颗粒与含氮气体进行氮化反应来制造主要为Fe 16 N 2 N 2相的氮化颗粒来制造磁粉，以在增加的 压力为0.1MPa以上。 氮化铁磁粉的增强性能使其适合用作高密度磁记录介质的磁性材料。

公开(公告)号：US20050208320A1

公开(公告)日：2005-09-22

申请号：US11064939

申请日：2005-02-25

申请人： Kenji Masada ,  Takafumi Amino ,  Akira Nagatomi

发明人： Kenji Masada ,  Takafumi Amino ,  Akira Nagatomi

IPC分类号： G11B5/706 ,  C01B21/06 ,  H01F1/04 ,  H01F1/047 ,  H01F1/06 ,  H01F1/20 ,  B32B5/16

CPC分类号： H01F1/065 ,  G11B5/70626 ,  Y10T428/12181 ,  Y10T428/2982

摘要： An iron nitride magnetic powder consisting primarily of Fe16N2 phase whose average particle diameter determined by particle size measurement using a TEM micrograph is 20 nm or less and whose geometric standard deviation of the particle diameter is 1.4 or less. The iron nitride magnetic powder can be obtained by a method of producing an iron nitride magnetic powder consisting primarily of Fe16N2 phase includes a step of, at the time of producing an iron nitride magnetic powder consisting primarily of Fe16N2 phase by subjecting a reduced powder obtained by reduction of iron oxide to ammonia treatment, using goethite containing Al in solid solution as the iron oxide.

摘要翻译： 主要由通过TEM显微照片测定的平均粒径为Fe 2 N 3 N 2 N相的氮化铁磁粉为20nm以下，几何标准偏差 的粒径为1.4以下。 氮化铁磁粉可以通过生产主要由Fe 16 N 2 N 2 N相组成的氮化铁磁粉的方法获得，包括在制备时的步骤 通过将通过还原氧化铁获得的还原粉末进行氨处理，使用含有固体溶液中的Al的针铁矿作为主要由Fe 11 N 2 N 2相组成的氮化铁磁粉， 氧化铁。

公开(公告)号：US20050123754A1

公开(公告)日：2005-06-09

申请号：US10991511

申请日：2004-11-19

申请人： Kenji Masada ,  Takafumi Amino ,  Akira Nagatomi

发明人： Kenji Masada ,  Takafumi Amino ,  Akira Nagatomi

IPC分类号： H01F1/01 ,  B22F9/00 ,  C01B21/06 ,  C22C29/16 ,  G11B5/706 ,  H01F1/047 ,  H01F1/053 ,  H01F1/06 ,  C01G49/02

CPC分类号： C01B21/0622 ,  B82Y30/00 ,  C01P2004/64 ,  C01P2006/37 ,  C01P2006/42 ,  G11B5/70626 ,  H01F1/065 ,  Y10T428/12181 ,  Y10T428/2982 ,  Y10T428/2991 ,  Y10T428/2993 ,  Y10T428/2995

摘要： An iron nitride magnetic powder comprised primarily of Fe16N2 phase is characterized in that its coercive force Hc is 200 KA/m or greater and bulk switching field distribution BSDF is 2 or less. The magnetic powder can be produced by allowing a nitriding reaction of Fe particles with a nitrogen-containing gas for producing nitrided particles of primarily Fe16N2 phase to proceed under an increased pressure of 0.1 MPa or greater. The enhanced properties of the iron nitride magnetic powder make it suitable as a magnetic material for high-density magnetic recording media.

摘要翻译： 主要由Fe 11 N 2 N 2相组成的氮化铁磁粉的特征在于其矫顽力Hc为200KA / m以上，体积切换场分布BSDF为2 或更少。 可以通过使Fe颗粒与含氮气体进行氮化反应来制造主要为Fe 16 N 2 N 2相的氮化颗粒来制造磁粉，以在增加的 压力为0.1MPa以上。 氮化铁磁粉的增强性能使其适合用作高密度磁记录介质的磁性材料。

公开(公告)号：US07332220B2

公开(公告)日：2008-02-19

申请号：US11064939

申请日：2005-02-25

申请人： Kenji Masada ,  Takafumi Amino ,  Akira Nagatomi

发明人： Kenji Masada ,  Takafumi Amino ,  Akira Nagatomi

IPC分类号： B32B5/16

CPC分类号： H01F1/065 ,  G11B5/70626 ,  Y10T428/12181 ,  Y10T428/2982

摘要： An iron nitride magnetic powder consisting primarily of Fe16N2 phase whose average particle diameter determined by particle size measurement using a TEM micrograph is 20 nm or less and whose geometric standard deviation of the particle diameter is 1.4 or less. The iron nitride magnetic powder can be obtained by a method of producing an iron nitride magnetic powder consisting primarily of Fe16N2 phase includes a step of, at the time of producing an iron nitride magnetic powder consisting primarily of Fe16N2 phase by subjecting a reduced powder obtained by reduction of iron oxide to ammonia treatment, using goethite containing Al in solid solution as the iron oxide.

摘要翻译： 主要由通过TEM显微照片测定的平均粒径为Fe 2 N 3 N 2 N相的氮化铁磁粉为20nm以下，几何标准偏差 的粒径为1.4以下。 氮化铁磁粉可以通过生产主要由Fe 16 N 2 N 2 N相组成的氮化铁磁粉的方法获得，包括在制备时的步骤 通过将通过还原氧化铁获得的还原粉末进行氨处理，使用含有固体溶液中的Al的针铁矿作为主要由Fe 11 N 2 N 2相组成的氮化铁磁粉， 氧化铁。

公开(公告)号：US20060131537A1

公开(公告)日：2006-06-22

申请号：US11311281

申请日：2005-12-20

申请人： Kenji Masada ,  Hiroshi Kimura ,  Takafumi Amino

发明人： Kenji Masada ,  Hiroshi Kimura ,  Takafumi Amino

IPC分类号： H01F1/00

CPC分类号： H01F1/061 ,  G11B5/70626 ,  Y10T428/25 ,  Y10T428/2982 ,  Y10T428/2991

摘要： An iron nitride system magnetic powder comprising of particles comprised primarily of Fe16N2 (having an average particle diameter of up to 25 nm, for example) is provided, to which one or more elements selected from Si, P and Ti is adhered. The powder has a C/Fe atomic ratio of 0.5 to 30%, preferably a (Si+P+Ti)/Fe atomic ratio of 0.1 to 10%. With ΔHc defined (Hc0−Hc1)/Hc0×100, the powder has a ΔHc of up to 5%, and with Δσs defined as (σs0−σs1)/σs0×100, a Δσs of up to 20%. The powder can provide an ignition temperature of 140° C. or above, and a tap density of 1.0 g/cm3 or above. Hc0 and σs0 are the coercive force (kA/m) and saturation magnetization (Am2/kg), respectively, of the iron nitride system magnetic powder after adhesion, and Hc1 and σs1 are the coercive force (kA/m) and saturation magnetization (Am2/kg), respectively, of the powder after it has been stored in a thermo-hygrostat for one week at a temperature of 60° C. and a relative humidity of 90%.

摘要翻译： 提供了由主要由Fe 16 N 2（例如平均粒径高达25nm）组成的粒子构成的氮化铁系磁铁粉末，其中选自Si，P 并附着Ti。 该粉末的C / Fe原子比为0.5〜30％，优选为（Si + P + Ti）/ Fe原子比为0.1〜10％。 通过定义的DeltaHc（Hc Hc 1）/ Hc x100，粉末的DeltaHc高达5％，并且具有Deltasigmas 定义为（sigmas _{0 -sigmas ）/ sigmas x100，最大为20％的Deltasigmas。 该粉末可以提供140℃以上的点火温度和1.0g / cm 3以上的振实密度。 Hc <0>和Sigmas <0>分别是铁的矫顽力（kA / m）和饱和磁化强度（Am 2 SUP / kg） 氮化物系磁性粉末粘合后，矫顽力（kA / m）和饱和磁化强度（Am 2 / kg），分别在温度为60℃，相对湿度为90％的温度恒温箱中保存一周后，粉末分散。}

公开(公告)号：US20060024501A1

公开(公告)日：2006-02-02

申请号：US11192178

申请日：2005-07-29

申请人： Kenji Masada ,  Takayuki Yoshida ,  Takafumi Amino

发明人： Kenji Masada ,  Takayuki Yoshida ,  Takafumi Amino

IPC分类号： C01G53/00 ,  B32B5/16

CPC分类号： H01F1/061 ,  Y10T428/2982 ,  Y10T428/2991 ,  Y10T428/2993

摘要： A high-reliability iron nitride-based magnetic powder with markedly improved weatherability with respect to deterioration over time of the magnetic properties in fine particles smaller than 25 nm is formed by adhering one or more of the elements Si and P to the surface of an iron nitride-based magnetic powder constituted primarily of Fe16N2 with an average grain size of 25 nm or less, where the total content of Si and P in the magnetic powder may be 0.1% or greater as an atomic ratio with respect to Fe. In particular, the invention provides an iron nitride-based magnetic powder such that the value ΔHc as defined by Equation (1) below is 5% or less and the value Δσs as defined by Equation (2) below is 20% or less. ΔHc=(Hc0−Hc1)/Hc0100  (1) Δσs=(σs0−σs1)/σs0100  (2) Here, Hc1 and σs1 are the coercivity and saturation magnetization, respectively, of the magnetic powder after being kept for one week at a constant temperature and constant humidity of 60° C. and 90% RH. Hc0 and σs0 are the coercivity and saturation magnetization of the magnetic powder before being kept at constant temperature and constant humidity.

摘要翻译： 通过将一个或多个元素Si和P粘附到铁的表面上，形成相对于小于25nm的细小颗粒中的磁特性随着时间的劣化而具有显着改善的耐候性的高可靠性的氮化铁基磁性粉末 主要由平均粒径为25nm以下的平均粒径为25nm以下的氮化物系磁性粉末构成，其中磁性粉末中Si和P的总含量可以 相对于Fe为原子比为0.1％以上。 特别地，本发明提供了一种基于氮化铁的磁性粉末，使得如下面等式（1）所定义的值ΔH3 C 5％或更小，并且值Deltasigma >如下式（2）所定义，为20％以下。 <？in-line-formula description =“In-line Formulas”end =“lead”？> DeltaH =（H c0 < （1）<？in-line-formula description =“In-line Formulas”end =“tail”？> <？in-line-formula description =“In 线公式“end =”lead“？> Deltasigma =（sigma sigma＆lt; s1＆gt;）sigma＆ SUB> 100（2）<？in-line-formula description =“In-line Formulas”end =“tail”？>这里，H＆gt; c1＆sigma＆sigma＆lt; s1＆lt; 分别在60℃，90％RH的恒温恒湿下保持1周后的磁性粉末的矫顽力和饱和磁化强度。 在保持在恒定温度和恒定湿度之前，磁粉的矫顽力和饱和磁化强度是高斯和高斯。

公开(公告)号：US07371458B2

公开(公告)日：2008-05-13

申请号：US11192178

申请日：2005-07-29

申请人： Kenji Masada ,  Takayuki Yoshida ,  Takafumi Amino

发明人： Kenji Masada ,  Takayuki Yoshida ,  Takafumi Amino

IPC分类号： B32B5/16 ,  B05D3/02

CPC分类号： H01F1/061 ,  Y10T428/2982 ,  Y10T428/2991 ,  Y10T428/2993

摘要： A high-reliability iron nitride-based magnetic powder with markedly improved weatherability with respect to deterioration over time of the magnetic properties in fine particles smaller than 25 nm is formed by adhering one or more of the elements Si and P to the surface of an iron nitride-based magnetic powder constituted primarily of Fe16N2 with an average grain size of 25 nm or less, where the total content of Si and P in the magnetic powder may be 0.1% or greater as an atomic ratio with respect to Fe. In particular, the invention provides an iron nitride-based magnetic powder such that the value ΔHc as defined by Equation (1) below is 5% or less and the value Δσs as defined by Equation (2) below is 20% or less. ΔHc=(Hc0−Hc1)/Hc0100  (1) Δσs=(σs0−σs1)/σs0100  (2) Here, Hc1 and σs1 are the coercivity and saturation magnetization, respectively, of the magnetic powder after being kept for one week at a constant temperature and constant humidity of 60° C. and 90% RH. Hc0 and σs0 are the coercivity and saturation magnetization of the magnetic powder before being kept at constant temperature and constant humidity.

摘要翻译： 通过将一个或多个元素Si和P粘附到铁的表面上，形成相对于小于25nm的细小颗粒中的磁特性随着时间的劣化而具有显着改善的耐候性的高可靠性的氮化铁基磁性粉末 主要由平均粒径为25nm以下的平均粒径为25nm以下的氮化物系磁性粉末构成，其中磁性粉末中Si和P的总含量可以 相对于Fe为原子比为0.1％以上。 特别地，本发明提供了一种基于氮化铁的磁性粉末，使得如下面等式（1）所定义的值ΔH3 C 5％或更小，并且值Deltasigma >如下式（2）所定义，为20％以下。 <？in-line-formula description =“In-line Formulas”end =“lead”？> DeltaH =（H c0 < （1）<？in-line-formula description =“In-line Formulas”end =“tail”？> <？in-line-formula description =“In 线公式“end =”lead“？> Deltasigma =（sigma sigma＆lt; s1＆gt;）sigma＆ SUB> 100（2）<？in-line-formula description =“In-line Formulas”end =“tail”？>这里，H＆gt; c1＆sigma＆sigma＆lt; s1＆lt; 分别在60℃，90％RH的恒温恒湿下保持1周后的磁性粉末的矫顽力和饱和磁化强度。 在保持在恒定温度和恒定湿度之前，磁粉的矫顽力和饱和磁化强度是高斯和高斯。

公开(公告)号：US07314666B2

公开(公告)日：2008-01-01

申请号：US11311281

申请日：2005-12-20

申请人： Kenji Masada ,  Hiroshi Kimura ,  Takafumi Amino

发明人： Kenji Masada ,  Hiroshi Kimura ,  Takafumi Amino

IPC分类号： B32B5/66

CPC分类号： H01F1/061 ,  G11B5/70626 ,  Y10T428/25 ,  Y10T428/2982 ,  Y10T428/2991

摘要： An iron nitride system magnetic powder comprising of particles comprised primarily of Fe16N2 (having an average particle diameter of up to 25 nm, for example) is provided, to which one or more elements selected from Si, P and Ti is adhered. The powder has a C/Fe atomic ratio of 0.5 to 30%, preferably a (Si+P+Ti)/Fe atomic ratio of 0.1 to 10%. With ΔHc defined (Hc0·Hc1)/Hc0×100, the powder has a ΔHc of up to 5%, and with Δσs defined as (σs0·σs1)/σs0×100, a Δσs of up to 20%. The powder can provide an ignition temperature of 140° C. or above, and a tap density of 1.0 g/cm3 or above. Hc0 and σs0 are the coercive force (kA/m) and saturation magnetization (Am2/kg), respectively, of the iron nitride system magnetic powder after adhesion, and Hc1 and σs1 are the coercive force (kA/m) and saturation magnetization (Am2/kg), respectively, of the powder after it has been stored in a thermo-hygrostat for one week at a temperature of 60° C. and a relative humidity of 90%.

摘要翻译： 提供了由主要由Fe 16 N 2（例如平均粒径高达25nm）组成的粒子构成的氮化铁系磁铁粉末，其中选自Si，P 并附着Ti。 该粉末的C / Fe原子比为0.5〜30％，优选为（Si + P + Ti）/ Fe原子比为0.1〜10％。 通过定义的ΔHc（Hc Hc 1 / hc x100，粉末的DeltaHc高达5％，并且具有Deltasigmas 定义为（sigmas _{0 .sigmas ）/ sigmas 0 x100，高达20％的Deltasigmas。 该粉末可以提供140℃以上的点火温度和1.0g / cm 3以上的振实密度。 Hc <0>和Sigmas <0>分别是铁的矫顽力（kA / m）和饱和磁化强度（Am 2 SUP / kg） 氮化物系磁性粉末粘合后，矫顽力（kA / m）和饱和磁化强度（Am 2 / kg），分别在温度为60℃，相对湿度为90％的温度恒温箱中保存一周后，粉末分散。}

公开(公告)号：US20070042230A1

公开(公告)日：2007-02-22

申请号：US11494550

申请日：2006-07-28

申请人： Kenji Masada ,  Yuzo Ishikawa ,  Hiroshi Kimura

发明人： Kenji Masada ,  Yuzo Ishikawa ,  Hiroshi Kimura

IPC分类号： G11B5/708 ,  H01F1/20

CPC分类号： H01F1/065 ,  G11B5/70615 ,  G11B5/70626 ,  G11B5/714

摘要： An iron system magnetic powder, and particularly an iron system magnetic powder comprised chiefly of Fe16N2, is provided that has an atomic ratio of total noble metal content to Fe of 0.01-10%. The magnetic powder can be produced by subjecting iron oxy-hydroxide or iron oxide having an atomic ratio of total noble metal content to Fe of 0.01-10% to reduction treatment. The average particle volume of the magnetic powder is preferably 4,000 nm3 or less. The magnetic powder is suitable for fabricating high recording density media of low noise, high output and high C/N ratio that are suitable for use with a GMR head or the like.

摘要翻译： 提供了一种铁系磁粉，特别是主要由Fe 16 N 2 N 2构成的铁系磁性粉末，其具有总贵金属含量与Fe的原子比 0.01-10％。 磁性粉末可以通过使具有0.01-10％的总贵金属含量的原子比的氧化铁或氧化铁进行还原处理来制造。 磁粉的平均粒子体积优选为4000nm以下3以下。 该磁性粉末适用于制造适用于GMR头等的低噪声，高输出和高C / N比的高记录密度介质。

公开(公告)号：US08801956B2

公开(公告)日：2014-08-12

申请号：US13500989

申请日：2010-01-29

申请人： Kenji Masada ,  Tomoyuki Ishiyama ,  Gousuke Iwasaki

发明人： Kenji Masada ,  Tomoyuki Ishiyama ,  Gousuke Iwasaki

IPC分类号： C01G49/00 ,  H01F1/11

CPC分类号： G11B5/70678 ,  B82Y30/00 ,  C01G49/0018 ,  C01G49/0036 ,  C01P2004/64 ,  C01P2006/12 ,  C01P2006/42 ,  C04B35/2633 ,  C04B35/2641 ,  C04B35/62665 ,  C04B35/62675 ,  C04B2235/3215 ,  C04B2235/3224 ,  C04B2235/3225 ,  C04B2235/3232 ,  C04B2235/3275 ,  C04B2235/3298 ,  C04B2235/3409 ,  C04B2235/5409 ,  C04B2235/5436 ,  C04B2235/5445 ,  C04B2235/767 ,  G11B5/714 ,  H01F1/11

摘要： A hexagonal crystal ferrite magnetic powder having high magnetic characteristics while having a small particle volume and a high specific surface area is provided, and a high-density magnetic recording medium using the powder. A method for producing a hexagonal crystal ferrite formed using a glass crystallization method includes the steps of: mixing a glass matrix with raw materials including iron, bismuth, a divalent metal (M1), a tetravalent metal (M2), any one kind (A) of barium, strontium, calcium, and lead, and at least one kind of rare earth element (represented by R) having a mole equal to or less than that of the iron; heating the mixed raw material to obtain a glass body; quenching the glass body, pulverizing the glass body, and performing a heat treatment, and washing the glass body after the heat treatment with an acid solution.

摘要翻译： 提供具有高磁特性同时具有小颗粒体积和高比表面积的六方晶体铁氧体磁粉，以及使用该粉末的高密度磁记录介质。 使用玻璃结晶法形成的六方晶系铁氧体的制造方法包括以下步骤：将玻璃基体与铁，铋，二价金属（M1），四价金属（M2），任一种（A） ），钡，锶，钙和铅的至少一种稀土元素（R表示），摩尔等于或小于铁的稀土元素; 加热混合原料以获得玻璃体; 淬火玻璃体，粉碎玻璃体，进行热处理，并在用酸溶液进行热处理后洗涤玻璃体。