公开(公告)号：US5219500A

公开(公告)日：1993-06-15

申请号：US446598

申请日：1989-12-06

申请人： Makoto Yoshida ,  Masahiro Sato ,  Kazunori Koga ,  Kazumi Osamura ,  Shoji Kousaka ,  Tatsumi Maeda ,  Kiyoshi Yokoyama ,  Masafumi Matsunaka

发明人： Makoto Yoshida ,  Masahiro Sato ,  Kazunori Koga ,  Kazumi Osamura ,  Shoji Kousaka ,  Tatsumi Maeda ,  Kiyoshi Yokoyama ,  Masafumi Matsunaka

IPC分类号： C04B35/593

CPC分类号： C04B35/5935

摘要： Disclosed is a silicon nitride sintered body comprising 85 to 99 mole % of .beta.-Si.sub.3 N.sub.4, 1 to 5 mole % as the oxide (M.sub.2 O.sub.3) of at least one compound of an element (M) selected from the group consisting of Sc, Vb, Er, Ho and Dy and less than 10 mole % of excessive oxygen (O.sub.2) based on the three components, wherein the excessive oxygen/M.sub.2 O.sub.3 molar ratio is lower than 2.

摘要翻译： 公开了一种氮化硅烧结体，其包含85至99摩尔％的β-Si 3 N 4，1至5摩尔％的至少一种元素（M）的化合物的氧化物（M 2 O 3），其选自Sc，Vb， Er，Ho和Dy，并且基于三种组分小于10摩尔％的过量氧（O 2），其中过量的氧/ M 2 O 3摩尔比低于2。

公开(公告)号：US4920085A

公开(公告)日：1990-04-24

申请号：US176605

申请日：1988-04-01

申请人： Makoto Yoshida ,  Masahiro Sato ,  Kazunori Koga ,  Kazumi Osamura ,  Shoji Kousaka ,  Tatsumi Maeda ,  Kiyoshi Yokoyama ,  Masafumi Matsunaka

发明人： Makoto Yoshida ,  Masahiro Sato ,  Kazunori Koga ,  Kazumi Osamura ,  Shoji Kousaka ,  Tatsumi Maeda ,  Kiyoshi Yokoyama ,  Masafumi Matsunaka

IPC分类号： C04B35/593

CPC分类号： C04B35/5935

摘要： Disclosed is a silicon nitride sintered body comprising 85 to 99 mol % of .beta.-Si.sub.3 N.sub.4, 1 to 5 mol % as the oxide (M.sub.2 O.sub.3) of at least one compound of an element (M) selected from the group consisting of Sc, Vb, Er, Ho and Dy and less than 10 mol % of excessive oxygen (O.sub.2) based on the three components, wherein the excessive oxygen/M.sub.2 O.sub.3 molar ratio is lower than 2.

摘要翻译： 公开了一种氮化硅烧结体，其包含85至99mol％的β-Si 3 N 4，1至5mol％的至少一种元素（M）的化合物的氧化物（M 2 O 3），其选自Sc，Vb， Er，Ho和Dy，并且基于三种组分小于10mol％的过量氧（O 2），其中过量的氧/ M 2 O 3摩尔比低于2。

公开(公告)号：US4699771A

公开(公告)日：1987-10-13

申请号：US716120

申请日：1985-03-26

申请人： Hirotaka Yokoyama ,  Tadashi Ido ,  Tatsumi Maeda ,  Shunji Kurisu

发明人： Hirotaka Yokoyama ,  Tadashi Ido ,  Tatsumi Maeda ,  Shunji Kurisu

IPC分类号： G11B5/706 ,  C01F11/46 ,  C01G49/02 ,  C04B35/26

CPC分类号： G11B5/70678 ,  Y10S428/90 ,  Y10T428/2982

摘要： A matnetic recording powder comprising a hexagonal barium ferrite substituted with a coercive force control element. This magnetic powder is preliminarily treated with sulfate ion-containing water so as to convert any free barium ions in the magnetic powder to a water insoluble compound such as BaSO.sub.4 or BaS.sub.2 O.sub.7. There is also proposed a magnetic recording medium having a magnetic layer containing such a magnetic powder as mentioned above.

摘要翻译： 一种包含被矫顽力控制元件取代的六方晶系钡铁氧体的生物记录粉末。 该磁性粉末用含硫酸根离子的水预先处理，以将磁性粉末中的任何游离的钡离子转化为不溶于水的化合物如BaSO 4或BaS 2 O 7。 还提出了具有如上所述的含有这种磁性粉末的磁性层的磁记录介质。

公开(公告)号：US5766763A

公开(公告)日：1998-06-16

申请号：US701403

申请日：1996-08-22

申请人： Shunji Kurisu ,  Osamu Kubo ,  Tatsumi Maeda ,  Etsuji Ogawa

发明人： Shunji Kurisu ,  Osamu Kubo ,  Tatsumi Maeda ,  Etsuji Ogawa

IPC分类号： C01G49/00 ,  G11B5/706 ,  G11B5/84 ,  H01F1/11 ,  H01F1/113 ,  G11B5/66 ,  G11B5/70

CPC分类号： C01G49/009 ,  C01G49/00 ,  G11B5/70678 ,  G11B5/84 ,  H01F1/11 ,  H01F1/113 ,  C01P2002/76 ,  C01P2004/52 ,  C01P2006/10 ,  C01P2006/12 ,  C01P2006/42 ,  Y10S428/90 ,  Y10T428/2991

摘要： A magnetic powder is disclosed which is characterized by possessing a powder compression characteristic such that the magnetic powder, after being packed in a closed container, pressed at a load of 400 kgf/cm.sup.3, and relieved of the load, exhibits a packing density in the range of 2.5 to 3.5 g/cm.sup.3 and a geometric standard deviation of not more than 1.5 in the particle diameter distribution. A magnetic recording medium using the magnetic powder mentioned above has high packing and, consequently, secures high output, and has ample diminution of noise.

摘要翻译： 公开了一种磁粉，其特征在于具有粉末压缩特性，使得磁粉在被包装在密闭容器中之后，以400kgf / cm 3的负荷压下并释放负载，表现出在 范围为2.5〜3.5g / cm3，粒径分布的几何标准偏差为1.5以下。 使用上述磁粉的磁记录介质具有高填充性，因此确保高输出，并且噪声大大降低。

公开(公告)号：US4493874A

公开(公告)日：1985-01-15

申请号：US473200

申请日：1983-03-08

申请人： Osamu Kubo ,  Tadashi Ido ,  Tutomu Nomura ,  Tatsumi Maeda

发明人： Osamu Kubo ,  Tadashi Ido ,  Tutomu Nomura ,  Tatsumi Maeda

IPC分类号： C01G49/00 ,  C01G51/00 ,  C03C10/00 ,  G11B5/706 ,  G11B5/712 ,  H01F1/11 ,  C04B35/26

CPC分类号： B82Y30/00 ,  C01G49/0036 ,  C01G49/009 ,  C01G51/006 ,  C03C10/0081 ,  G11B5/70678 ,  G11B5/712 ,  H01F1/11 ,  C01P2002/54 ,  C01P2004/54 ,  C01P2004/62 ,  C01P2004/64 ,  C01P2006/12 ,  C01P2006/42 ,  C01P2006/80 ,  Y10S428/90 ,  Y10T428/2991 ,  Y10T428/2996

摘要： A hexagonal ferrite magnetic powder for high density magnetic recording, having an improved dispersibility in a binder or paint is obtained by melting a mixture of hexagonal ferrite-forming components and a glass-forming component, and rapidly cooling the resultant molten mixture to obtain an amorphous material. The amorphous material is thermally treated to precipitate fine particles of the hexagonal ferrite therein. The amorphous material containing the precipitated fine particles is dissolved such that the glass-forming component remains on each of said fine particles in an amount of 0.01 to 0.3% by weight based on the weight of the particles.

摘要翻译： 通过熔融六方晶系铁氧体形成组分和玻璃形成组分的混合物，可以获得在粘合剂或涂料中具有改进的分散性的用于高密度磁记录的六角铁氧体磁粉，并快速冷却所得到的熔融混合物以获得无定形 材料。 将无定形材料进行热处理以使其中的六方晶系铁氧体的细颗粒析出。 含有沉淀的细颗粒的无定形材料被溶解，使得玻璃形成组分基于颗粒的重量以0.01至0.3重量％的量残留在每个所述细颗粒上。

公开(公告)号：US5576114A

公开(公告)日：1996-11-19

申请号：US190927

申请日：1994-02-03

申请人： Shunji Kurisu ,  Osamu Kubo ,  Tatsumi Maeda ,  Etsuji Ogawa

发明人： Shunji Kurisu ,  Osamu Kubo ,  Tatsumi Maeda ,  Etsuji Ogawa

IPC分类号： C01G49/00 ,  G11B5/706 ,  G11B5/84 ,  H01F1/11 ,  H01F1/113 ,  G11B5/66 ,  G11B5/70

CPC分类号： C01G49/009 ,  C01G49/00 ,  G11B5/70678 ,  G11B5/84 ,  H01F1/11 ,  H01F1/113 ,  C01P2002/76 ,  C01P2004/52 ,  C01P2006/10 ,  C01P2006/12 ,  C01P2006/42 ,  Y10S428/90 ,  Y10T428/2991

摘要： A magnetic powder is disclosed which is characterized by possessing a powder compression characteristic such that the magnetic powder, after being packed in a closed container, pressed at a load of 400 kgf/cm.sup.3 and relieved of the load, exhibits a packing density in the range of 2.5 to 3.5 g/cm.sup.3 and a geometric standard deviation of not more than 1.5 in the particle diameter distribution. A magnetic recording medium using the magnetic powder mentioned above has high packing and, consequently, secures high output, and has ample diminution of noise.

摘要翻译： 公开了一种磁粉，其特征在于具有粉末压缩特性，使得磁粉在被包装在密闭容器中，以400kgf / cm 3的负荷压载并释放负载后，表现出在该范围内的堆积密度 为2.5〜3.5g / cm3，粒径分布的几何标准偏差为1.5以下。 使用上述磁粉的磁记录介质具有高填充性，因此确保高输出，并且噪声大大降低。

公开(公告)号：US5132072A

公开(公告)日：1992-07-21

申请号：US647284

申请日：1991-01-29

申请人： Osamu Fukuoka ,  Tatsumi Maeda ,  Toshiyuki Akamatsu ,  Kazuto Matsukami

发明人： Osamu Fukuoka ,  Tatsumi Maeda ,  Toshiyuki Akamatsu ,  Kazuto Matsukami

IPC分类号： C04B35/632

CPC分类号： C04B35/632

摘要： A molding method of ceramic body comprising the following steps of:preparing a ceramic slurry by adding, to ceramic raw material powders, a solvent, organic dispersant and caking agent and mixing them altogether; casting said ceramic slurry into a mold; cooling it to a temperature lower than the melting point of said caking agent; and taking it out of the mold.This molding method is capable of dissolving cracking generation during releasing the ceramic body from a mold, facilitating machining, decreasing the binder amount of organic compounds, diminishing a firing shrinkage and obtaining a higher dimension accuracy.

摘要翻译： 一种陶瓷体的成型方法，包括以下步骤：通过向陶瓷原料粉末中加入溶剂，有机分散剂和结块剂并共混而制备陶瓷浆料; 将所述陶瓷浆料浇​​铸成模具; 将其冷却至低于所述结块剂熔点的温度; 并将其从模具中取出。 该成型方法能够将模具中的陶瓷体脱模时的裂纹发生溶解，促进机械加工，降低有机化合物的粘合剂量，降低烧成收缩率，获得更高的尺寸精度。

公开(公告)号：US4578313A

公开(公告)日：1986-03-25

申请号：US536855

申请日：1983-09-28

申请人： Takeo Ito ,  Tadashi Ido ,  Hajime Takeuchi ,  Minoru Hashimoto ,  Tatsumi Maeda ,  Masashi Awa

发明人： Takeo Ito ,  Tadashi Ido ,  Hajime Takeuchi ,  Minoru Hashimoto ,  Tatsumi Maeda ,  Masashi Awa

IPC分类号： C01G49/00 ,  C09D5/23 ,  C09D7/12 ,  G11B5/706 ,  G11B5/712 ,  H01F1/11 ,  B32B19/02

CPC分类号： G11B5/712 ,  G11B5/70678 ,  Y10S428/90 ,  Y10T428/2991 ,  Y10T428/2998 ,  Y10T428/30 ,  Y10T428/31786

摘要： A powder for a magnetic recording medium comprising a plurality of magnetic particles and a coating covering the surfaces of the magnetic particles. The coating is a residue resulting from the thermal decomposition of an organic material. The powder is manufactured by applying one or more organic materials to the surfaces of a plurality of magnetic particles by dispersing the magnetic particles in a solution containing the organic material. The magnetic particles, having the organic material as a coating, are separated from the solution, and the magnetic particles are heated to a temperature at which the organic material decomposes.

摘要翻译： 一种用于磁记录介质的粉末，包括多个磁性颗粒和覆盖磁性颗粒表面的涂层。 涂层是由有机材料的热分解产生的残留物。 通过将磁性颗粒分散在含有有机材料的溶液中，将一种或多种有机材料施加到多个磁性颗粒的表面来制造粉末。 将具有有机材料作为涂层的磁性颗粒与溶液分离，并将磁性颗粒加热至有机材料分解的温度。

公开(公告)号：US5698336A

公开(公告)日：1997-12-16

申请号：US629766

申请日：1996-04-09

申请人： Minoru Hashimoto ,  Tatsumi Maeda ,  Masahiro Fukasawa ,  Kazutaka Akiyama ,  Tsutomu Tanaka

发明人： Minoru Hashimoto ,  Tatsumi Maeda ,  Masahiro Fukasawa ,  Kazutaka Akiyama ,  Tsutomu Tanaka

IPC分类号： G11B5/706 ,  G11B5/66

CPC分类号： G11B5/70678 ,  Y10S428/90

摘要： A magnetic recording medium is disclosed, which has a magnetic layer containing a hexagonal ferrite powder dispersed in a resin binder, the magnetic layer being formed on a nonmagnetic supporting substrate, wherein the hexagonal ferrite powder is a compound represented by the following chemical formula AO.2 (M.sup.1 0).Fe.sub.16-x M.sup.2.sub.x 0.sub.24 where A is at least one element selected from the group consisting of Ba, Sr, Ca, and Pb; M.sup.1 is at least one element selected from the group consisting of Zn, Ni and Co; M.sup.2 is one combination selected from the group consisting of a combination of two elements of Co and Ti, a combination of two elements of Ti and Zn, and a combination of three elements of Co, Ti and Zn; and x designates a number in the range from 0.6 to 3.0, the hexagonal ferrite powder having an average diameter/thickness ratio in the range from 2.0 to 5.0; the magnetic recording medium of the present invention has both resistance to the temporary variation of coercive force caused by a fluctuation of environmental temperatures and resistance to the permanent variation of the coercive force resulting from a long time storage and operation.

摘要翻译： 公开了一种磁记录介质，其具有包含分散在树脂粘合剂中的六方铁氧体粉末的磁性层，所述磁性层形成在非磁性支撑基板上，其中所述六方晶系铁氧体粉末是由以下化学式AO.2表示的化合物 （M10）Fe16-xM2x024其中A是选自Ba，Sr，Ca和Pb中的至少一种元素; M1是选自Zn，Ni和Co中的至少一种元素; M2是选自Co和Ti的两种元素的组合，Ti和Zn的两种元素的组合以及Co，Ti和Zn的三种元素的组合的组合的组合; x表示0.6〜3.0的数值，平均直径/厚度比在2.0〜5.0的六角铁氧体粉末; 本发明的磁记录介质既具有由于环境温度变动引起的矫顽力的暂时变化的抵抗性，并且耐长时间保存和操作导致的矫顽力的永久性变化。

公开(公告)号：US5494749A

公开(公告)日：1996-02-27

申请号：US307284

申请日：1994-09-16

申请人： Osamu Kubo ,  Tatsumi Maeda ,  Tutomu Nomura ,  Shunji Kurisu ,  Etsuji Ogawa

发明人： Osamu Kubo ,  Tatsumi Maeda ,  Tutomu Nomura ,  Shunji Kurisu ,  Etsuji Ogawa

IPC分类号： G11B5/706 ,  B32B5/16

CPC分类号： G11B5/70678 ,  Y10S428/90 ,  Y10T428/2982

摘要： A magnetic powder for magnetic recording is disclosed which comprises composite magnetic particles (A), each of which contains hexagonal ferrite and spinel structure ferrite, and single phase magnetic particles of hexagonal ferrite (B). When the mixing ratio [(A):(B)] of (A) and (B) in the range from 5:95 to 95:5, remarkable effect can be obtained. Especially, when the mixing ratio of (A) and (B) is in the range from 5:95 to 30:70, the dispersion property is improved due to disturbance of magnetic stacking. Thus, the magnetic powder in this mixing ratio is particularly suitable for magnetic recording in a short wavelength range. When the mixing ratio of (A) and (B) is in the range from 70:30 to 95:5, the reproduction output is improved due to activation of (A). Thus, the magnetic powder in this mixing ratio is specifically suitable for magnetic recording in a long wavelength range. By containing the magnetic powder described above, a perpendicular magnetic recording medium with high electromagnetic characteristics, particularly a high S/N ratio and a low noise can be obtained.

摘要翻译： 公开了一种用于磁记录的磁粉，其包含复合磁性颗粒（A），每个复合磁性颗粒包含六方晶系铁氧体和尖晶石结构铁氧体，以及六方晶系铁氧体的单相磁性颗粒（B）。 当（A）和（B）的混合比[（A）：（B）]在5:95至95:5的范围内时，可以获得显着的效果。 特别是，当（A）和（B）的混合比在5:95至30:70的范围内时，由于磁性堆叠的干扰，分散性能得到改善。 因此，这种混合比的磁粉特别适用于短波长范围内的磁记录。 当（A）和（B）的混合比在70:30至95:5的范围内时，由于（A）的激活，再现输出被改善。 因此，该混合比例的磁粉特别适用于长波长范围的磁记录。 通过含有上述磁粉，可以获得具有高电磁特性，特别是高S / N比和低噪声的垂直磁记录介质。