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1. 发明申请

US20060131537A1 Iron nitride system magnetic powder having good storage stability 失效
标题翻译：具有良好储存稳定性的氮化铁系磁粉
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。}

2. 发明申请

US20060024501A1 High-weatherability iron nitride-based magnetic powder and method of manufacturing the powder 失效
标题翻译：高耐候性氮化铁基磁粉及其制造方法
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。

3. 发明申请

US20050208320A1 Iron nitride magnetic powder and method of producing the powder 失效
标题翻译：氮化铁磁粉及其制造方法
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。

4. 发明授权

US07241501B2 Iron nitride magnetic powder and method of producing the powder 失效
标题翻译：氮化铁磁粉及其制造方法
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。

5. 发明授权

US07371458B2 High-weatherability iron nitride-based magnetic powder and method of manufacturing the powder 失效
标题翻译：高耐候性氮化铁基磁粉及其制造方法
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。

6. 发明授权

US07332220B2 Iron nitride magnetic powder and method of producing the powder 失效
标题翻译：氮化铁磁粉及其制造方法
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。

7. 发明授权

US07314666B2 Iron nitride system magnetic powder having good storage stability 失效
标题翻译：具有良好储存稳定性的氮化铁系磁粉
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。}}

8. 发明申请

US20050123754A1 Iron nitride magnetic powder and method of producing the powder 失效
标题翻译：氮化铁磁粉及其制造方法
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。

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