公开(公告)号：US08357222B2

公开(公告)日：2013-01-22

申请号：US12952273

申请日：2010-11-23

申请人： Takayuki Yoshida ,  Masatoshi Nakayama ,  Ryota Igarashi

发明人： Takayuki Yoshida ,  Masatoshi Nakayama ,  Ryota Igarashi

IPC分类号： B22F9/16 ,  H01F1/14

CPC分类号： H01F1/065 ,  G11B5/70615 ,  G11B5/70621 ,  G11B5/714 ,  H01F1/0054 ,  H01F1/061 ,  H01F1/09 ,  Y10T428/2991

摘要： A metal magnetic powder for a magnetic recording medium is provided whose particles have a metal magnetic phase, composed mainly of Fe or Fe plus Co, and an oxide layer, wherein the average major axis length of the powder particles is 10-50 nm, the average particle volume including the oxide layer is 5,000 nm3 or less, the atomic ratio (R+Al+Si)/(Fe+Co) calculated using the content values (at. %) of the elements contained in the powder particles is 20% or less, where R is rare earth element (Y being treated as a rare earth element). The metal magnetic powder is obtained by using a complexing agent and a reducing agent to elute nonmagnetic constituents after firing. The metal magnetic powder exhibits a large saturation magnetization as for its particle volume while maintaining weatherability comparable to the conventional level and is suitable for a coated-type magnetic recording medium.

摘要翻译： 提供一种用于磁记录介质的金属磁粉，其颗粒具有主要由Fe或Fe + Co组成的金属磁性相和氧化物层，其中粉末颗粒的平均长轴长度为10-50nm， 包含氧化物层的平均粒子体积为5000nm 3以下，使用粉末颗粒中所含的成分的含量值（at。％）计算出的原子比（R + Al + Si）/（Fe + Co）为20％ 或更少，其中R是稀土元素（Y被当作稀土元素处理）。 通过使用络合剂和还原剂在烧制后洗脱非磁性成分得到金属磁性粉末。 金属磁性粉末对于其颗粒体积表现出大的饱和磁化强度，同时保持与常规水平相当的耐候性，并且适用于涂覆型磁记录介质。

公开(公告)号：US20110061496A1

公开(公告)日：2011-03-17

申请号：US12952273

申请日：2010-11-23

申请人： Takayuki YOSHIDA ,  Masatoshi NAKAYAMA ,  Ryota IGARASHI

发明人： Takayuki YOSHIDA ,  Masatoshi NAKAYAMA ,  Ryota IGARASHI

IPC分类号： B22F9/16

CPC分类号： H01F1/065 ,  G11B5/70615 ,  G11B5/70621 ,  G11B5/714 ,  H01F1/0054 ,  H01F1/061 ,  H01F1/09 ,  Y10T428/2991

摘要： A metal magnetic powder for a magnetic recording medium is provided whose particles have a metal magnetic phase, composed mainly of Fe or Fe plus Co, and an oxide layer, wherein the average major axis length of the powder particles is 10-50 nm, the average particle volume including the oxide layer is 5,000 nm3 or less, the atomic ratio (R+Al+Si)/(Fe+Co) calculated using the content values (at. %) of the elements contained in the powder particles is 20% or less, where R is rare earth element (Y being treated as a rare earth element). The metal magnetic powder is obtained by using a complexing agent and a reducing agent to elute nonmagnetic constituents after firing. The metal magnetic powder exhibits a large saturation magnetization as for its particle volume while maintaining weatherability comparable to the conventional level and is suitable for a coated-type magnetic recording medium.

摘要翻译： 提供一种用于磁记录介质的金属磁粉，其颗粒具有主要由Fe或Fe + Co组成的金属磁性相和氧化物层，其中粉末颗粒的平均长轴长度为10-50nm， 包含氧化物层的平均粒子体积为5000nm 3以下，使用粉末颗粒中所含的成分的含量值（at。％）计算出的原子比（R + Al + Si）/（Fe + Co）为20％ 或更少，其中R是稀土元素（Y被当作稀土元素处理）。 通过使用络合剂和还原剂在烧制后洗脱非磁性成分得到金属磁性粉末。 金属磁性粉末对于其颗粒体积表现出大的饱和磁化强度，同时保持与常规水平相当的耐候性，并且适用于涂覆型磁记录介质。

公开(公告)号：US07854807B2

公开(公告)日：2010-12-21

申请号：US11727482

申请日：2007-03-27

申请人： Takayuki Yoshida ,  Masatoshi Nakayama ,  Ryota Igarashi

发明人： Takayuki Yoshida ,  Masatoshi Nakayama ,  Ryota Igarashi

IPC分类号： H01F1/147 ,  H01F1/20

CPC分类号： H01F1/065 ,  G11B5/70615 ,  G11B5/70621 ,  G11B5/714 ,  H01F1/0054 ,  H01F1/061 ,  H01F1/09 ,  Y10T428/2991

摘要： A metal magnetic powder for a magnetic recording medium is provided whose particles have a metal magnetic phase, composed mainly of Fe or Fe plus Co, and an oxide layer, wherein the average major axis length of the powder particles is 10-50 nm, the average particle volume including the oxide layer is 5,000 nm3 or less, the atomic ratio (R+Al+Si)/(Fe+Co) calculated using the content values (at. %) of the elements contained in the powder particles is 20% or less, where R is rare earth element (Y being treated as a rare earth element). The metal magnetic powder is obtained by using a complexing agent and a reducing agent to elute nonmagnetic constituents after firing. The metal magnetic powder exhibits a large saturation magnetization σs for its particle volume while maintaining weatherability comparable to the conventional level and is suitable for a coated-type magnetic recording medium.

摘要翻译： 提供一种用于磁记录介质的金属磁粉，其颗粒具有主要由Fe或Fe + Co组成的金属磁性相和氧化物层，其中粉末颗粒的平均长轴长度为10-50nm， 包含氧化物层的平均粒子体积为5000nm 3以下，使用粉末颗粒中所含的成分的含量值（at。％）计算出的原子比（R + Al + Si）/（Fe + Co）为20％ 或更少，其中R是稀土元素（Y被当作稀土元素处理）。 通过使用络合剂和还原剂在烧制后洗脱非磁性成分得到金属磁性粉末。 金属磁性粉末对于其颗粒体积具有大的饱和磁化强度，同时保持与常规水平相当的耐候性，并且适用于涂覆型磁记录介质。

公开(公告)号：US20070227302A1

公开(公告)日：2007-10-04

申请号：US11727482

申请日：2007-03-27

申请人： Takayuki Yoshida ,  Masatoshi Nakayama ,  Ryota Igarashi

发明人： Takayuki Yoshida ,  Masatoshi Nakayama ,  Ryota Igarashi

IPC分类号： B22F9/18

CPC分类号： H01F1/065 ,  G11B5/70615 ,  G11B5/70621 ,  G11B5/714 ,  H01F1/0054 ,  H01F1/061 ,  H01F1/09 ,  Y10T428/2991

摘要： A metal magnetic powder for a magnetic recording medium is provided whose particles have a metal magnetic phase, composed mainly of Fe or Fe plus Co, and an oxide layer, wherein the average major axis length of the powder particles is 10-50 nm, the average particle volume including the oxide layer is 5,000 nm3 or less, the atomic ratio (R+Al+Si)/(Fe+Co) calculated using the content values (at. %) of the elements contained in the powder particles is 20% or less, where R is rare earth element (Y being treated as a rare earth element). The metal magnetic powder is obtained by using a complexing agent and a reducing agent to elute nonmagnetic constituents after firing. The metal magnetic powder exhibits a large saturation magnetization σs for its particle volume while maintaining weatherability comparable to the conventional level and is suitable for a coated-type magnetic recording medium.

摘要翻译： 提供一种用于磁记录介质的金属磁粉，其颗粒具有主要由Fe或Fe + Co组成的金属磁性相和氧化物层，其中粉末颗粒的平均长轴长度为10-50nm， 包括氧化物层的平均粒子体积为5000nm 3以下，使用元素的含量值（at。％）计算的原子比（R + Al + Si）/（Fe + Co） 粉末颗粒中的含量为20％以下，其中R为稀土元素（Y为稀土元素处理）。 通过使用络合剂和还原剂在烧制后洗脱非磁性成分得到金属磁性粉末。 金属磁性粉末对于其颗粒体积显示出大的饱和磁化强度，同时保持与常规水平相当的耐候性，并且适用于涂覆型磁记录介质。