公开(公告)号：US20090082191A1

公开(公告)日：2009-03-26

申请号：US12209851

申请日：2008-09-12

申请人： Ken Hirota ,  Yoshihiro Nakayama ,  Shingo Nakane

发明人： Ken Hirota ,  Yoshihiro Nakayama ,  Shingo Nakane

IPC分类号： C04B35/563

CPC分类号： C04B35/563 ,  C04B35/62685 ,  C04B35/645 ,  C04B2235/3217 ,  C04B2235/421 ,  C04B2235/422 ,  C04B2235/5248 ,  C04B2235/526 ,  C04B2235/5264 ,  C04B2235/5268 ,  C04B2235/5445 ,  C04B2235/604 ,  C04B2235/6562 ,  C04B2235/6565 ,  C04B2235/6567 ,  C04B2235/6581 ,  C04B2235/666 ,  C04B2235/77 ,  C04B2235/80 ,  C04B2235/96

摘要： Boron carbide ceramics produced by spark sintering methods have more desirable mechanical properties than conventionally produced carbides. The boron carbide ceramics include amorphous boron, amorphous carbon, and Al2O3 powder as a sintering aid. The boron carbides may also contain a carbon nano fiber in a nearly homogeneously dispersed state. The sintered compact has a relative density of a boron carbide ceramic of approximately not less than 99%. The boron carbide ceramics are prepared preferably by subjecting a mixed powder of the starting raw materials and the carbon nano fiber to simultaneous synthesis and sintering using the spark plasma sintering method.

摘要翻译： 通过火花烧结法生产的碳化硼陶瓷具有比常规生产的碳化物更理想的机械性能。 碳化硼陶瓷包括无定形硼，无定形碳和作为烧结助剂的Al 2 O 3粉末。 碳化硼也可以含有几乎均匀分散状态的碳纳米纤维。 烧结体的碳化硼陶瓷的相对密度约为99％以上。 优选通过使用放电等离子体烧结法使起始原料和碳纳米纤维的混合粉末同时进行合成和烧结来制备碳化硼陶瓷。

公开(公告)号：US07893000B2

公开(公告)日：2011-02-22

申请号：US12857283

申请日：2010-08-16

申请人： Ken Hirota ,  Yoshihiro Nakayama ,  Shingo Nakane

发明人： Ken Hirota ,  Yoshihiro Nakayama ,  Shingo Nakane

IPC分类号： C04B35/563 ,  C04B35/80

CPC分类号： C04B35/563 ,  C04B35/62685 ,  C04B35/645 ,  C04B2235/3217 ,  C04B2235/421 ,  C04B2235/422 ,  C04B2235/5248 ,  C04B2235/526 ,  C04B2235/5264 ,  C04B2235/5268 ,  C04B2235/5445 ,  C04B2235/604 ,  C04B2235/6562 ,  C04B2235/6565 ,  C04B2235/6567 ,  C04B2235/6581 ,  C04B2235/666 ,  C04B2235/77 ,  C04B2235/80 ,  C04B2235/96

摘要： Boron carbide ceramics produced by spark sintering methods have more desirable mechanical properties than conventionally produced carbides. The boron carbide ceramics include amorphous boron, amorphous carbon, and Al2O3 powder as a sintering aid. The boron carbides may also contain a carbon nano fiber in a nearly homogeneously dispersed state. The sintered compact has a relative density of a boron carbide ceramic of approximately not less than 99%. The boron carbide ceramics are prepared preferably by subjecting a mixed powder of the starting raw materials and the carbon nano fiber to simultaneous synthesis and sintering using the spark plasma sintering method.

摘要翻译： 通过火花烧结法生产的碳化硼陶瓷具有比常规生产的碳化物更理想的机械性能。 碳化硼陶瓷包括无定形硼，无定形碳和作为烧结助剂的Al 2 O 3粉末。 碳化硼也可以含有几乎均匀分散状态的碳纳米纤维。 烧结体的碳化硼陶瓷的相对密度约为99％以上。 优选通过使用放电等离子体烧结法使起始原料和碳纳米纤维的混合粉末同时进行合成和烧结来制备碳化硼陶瓷。

公开(公告)号：US07799715B2

公开(公告)日：2010-09-21

申请号：US12209851

申请日：2008-09-12

申请人： Ken Hirota ,  Yoshihiro Nakayama ,  Shingo Nakane

发明人： Ken Hirota ,  Yoshihiro Nakayama ,  Shingo Nakane

IPC分类号： C04B35/563 ,  C04B35/80

CPC分类号： C04B35/563 ,  C04B35/62685 ,  C04B35/645 ,  C04B2235/3217 ,  C04B2235/421 ,  C04B2235/422 ,  C04B2235/5248 ,  C04B2235/526 ,  C04B2235/5264 ,  C04B2235/5268 ,  C04B2235/5445 ,  C04B2235/604 ,  C04B2235/6562 ,  C04B2235/6565 ,  C04B2235/6567 ,  C04B2235/6581 ,  C04B2235/666 ,  C04B2235/77 ,  C04B2235/80 ,  C04B2235/96

摘要： Boron carbide ceramics produced by spark sintering methods have more desirable mechanical properties than conventionally produced carbides. The boron carbide ceramics include amorphous boron, amorphous carbon, and Al2O3 powder as a sintering aid. The boron carbides may also contain a carbon nano fiber in a nearly homogeneously dispersed state. The sintered compact has a relative density of a boron carbide ceramic of approximately not less than 99%. The boron carbide ceramics are prepared preferably by subjecting a mixed powder of the starting raw materials and the carbon nano fiber to simultaneous synthesis and sintering using the spark plasma sintering method.

摘要翻译： 通过火花烧结法生产的碳化硼陶瓷具有比常规生产的碳化物更理想的机械性能。 碳化硼陶瓷包括无定形硼，无定形碳和作为烧结助剂的Al 2 O 3粉末。 碳化硼也可以含有几乎均匀分散状态的碳纳米纤维。 烧结体的碳化硼陶瓷的相对密度约为99％以上。 优选通过使用放电等离子体烧结法使起始原料和碳纳米纤维的混合粉末同时进行合成和烧结来制备碳化硼陶瓷。

公开(公告)号：US4901179A

公开(公告)日：1990-02-13

申请号：US161408

申请日：1988-02-23

申请人： Mitsuo Satomi ,  Ken Hirota ,  Osamu Inoue

发明人： Mitsuo Satomi ,  Ken Hirota ,  Osamu Inoue

IPC分类号： G11B5/147 ,  G11B5/21

CPC分类号： G11B5/21 ,  G11B5/1475

摘要： Tape contact surface of a magnetic head is made of magnetic substance of multi-layered structure; interface insulation material for said multi layered structure and/or gap spacer material are made of oxides, complex oxides, nitrides and carbides of transition metal elements, IIa group elements of the periodic table and Zn; and accumulation of magnetic material from magnetic tape is prevented and output of magnetic head is stabilized.

摘要翻译： 磁头的磁带接触表面由多层结构的磁性物质制成; 用于所述多层结构和/或间隙间隔材料的界面绝缘材料由过渡金属元素的氧化物，复合氧化物，氮化物和碳化物，周期表的IIa族元素和Zn组成; 并且防止磁性材料从磁带的积聚，并使磁头的输出稳定。

公开(公告)号：US5183631A

公开(公告)日：1993-02-02

申请号：US535080

申请日：1990-06-08

申请人： Koichi Kugimiya ,  Yasuhiro Sugaya ,  Osamu Inoue ,  Mitsuo Satomi ,  Ken Hirota

发明人： Koichi Kugimiya ,  Yasuhiro Sugaya ,  Osamu Inoue ,  Mitsuo Satomi ,  Ken Hirota

IPC分类号： C22C32/00 ,  B22F1/02 ,  B22F3/00 ,  B22F3/14 ,  C04B35/74 ,  C22C1/04 ,  C22C1/10 ,  C22C33/02 ,  C22C38/00 ,  H01F1/24

CPC分类号： H01F1/24 ,  B22F1/02 ,  C04B35/74 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/2991

摘要： A composite material is provided which includes a discrete phase including grains made of a first substance; and a continuous phase including a thin coating film made of a second substance and formed on the surface of each of the grains. The thin coating film has a mean thickness smaller than the mean particle size of the grains. The grains are separated substantially from each other by the thin coating film. The porosity of the composite material is 5% or less.

公开(公告)号：US5238507A

公开(公告)日：1993-08-24

申请号：US535082

申请日：1990-06-08

申请人： Koichi Kugimiya ,  Yasuhiro Sugaya ,  Osamu Inoue ,  Ken Hirota ,  Mitsuo Satomi

发明人： Koichi Kugimiya ,  Yasuhiro Sugaya ,  Osamu Inoue ,  Ken Hirota ,  Mitsuo Satomi

IPC分类号： G11B5/133 ,  G11B5/193 ,  H01F1/08 ,  H01F1/24

CPC分类号： G11B5/133 ,  G11B5/193 ,  H01F1/083 ,  H01F1/24 ,  Y10S428/90 ,  Y10T428/115 ,  Y10T428/249956 ,  Y10T428/2991

摘要： A magnetic material is provided which includes a discrete phase including grains made of a first substance which comprises a magnetic metal; and a continuous phase including a thin coating film made of a second substance which comprises a dielectric or insulating substance. The thin coating film is formed on the surface of the grains and has a mean thickness smaller than the mean particle size of the grains. The grains are separated substantially from each other by the thin coating film.

公开(公告)号：US5073214A

公开(公告)日：1991-12-17

申请号：US424728

申请日：1989-10-20

申请人： Ken Hirota ,  Mitsuo Satomi ,  Koichi Kugimiya

发明人： Ken Hirota ,  Mitsuo Satomi ,  Koichi Kugimiya

IPC分类号： C23C8/18 ,  C22C33/02 ,  C22C38/00 ,  C22C38/06 ,  G11B5/147 ,  G11B5/31 ,  H01F1/147

CPC分类号： C22C33/0278 ,  G11B5/147 ,  G11B5/31 ,  H01F1/14791

摘要： A magnetic material having an Fe-Si-Al type magnetic alloy with addition of one or more additive elements selected from a group consisting of Be, Mg, Ca, Sr, Ba, Sc, Y, Nb, Ta and Hf. The material has been subjected to an oxidation heat-treatment so as to contain a predetermined amount of oxygen.

公开(公告)号：US4521323A

公开(公告)日：1985-06-04

申请号：US625353

申请日：1984-06-27

申请人： Ken Hirota ,  Yoshiaki Fujimoto ,  Kouichi Watanabe ,  Minoru Sugimura

发明人： Ken Hirota ,  Yoshiaki Fujimoto ,  Kouichi Watanabe ,  Minoru Sugimura

IPC分类号： C04B35/26 ,  C04B35/30 ,  C04B35/38

CPC分类号： C04B35/265 ,  C04B35/2658

摘要： A polycrystalline ferrite containing Na, Zr and Ca in amounts of 0.01 to 0.5% by weight, 0.005 to 0.5% by weight and 0.01 to 0.5% by weight respectively, in Mn-Zn or Ni-Zn ferrite to thereby enhance the toughness of said ferrite. Said ferrite is suited for a magnetic head with improved mechanical strength and excellent fine workability.

摘要翻译： 在Mn-Zn或Ni-Zn铁氧体中分别含有0.01〜0.5重量％，0.005〜0.5重量％和0.01〜0.5重量％的Na，Zr和Ca的多晶铁素体，从而提高所述 铁氧体。 所述铁氧体适用于具有改进的机械强度和优异的精加工性的磁头。

公开(公告)号：US5034285A

公开(公告)日：1991-07-23

申请号：US235717

申请日：1988-08-22

申请人： Mitsuo Satomi ,  Ken Hirota ,  Osamu Inoue

发明人： Mitsuo Satomi ,  Ken Hirota ,  Osamu Inoue

IPC分类号： G11B5/10 ,  G11B5/127 ,  G11B5/147 ,  G11B5/255

CPC分类号： G11B5/147 ,  G11B5/10 ,  G11B5/1272 ,  G11B5/255 ,  Y10S428/90 ,  Y10T428/1157

摘要： A magnetic head has substrate(s) having a thermal expansion coefficient nearly equal to that of a soft magnetic film formed thereon, and the substrate has a composition consisting of .alpha.-Fe.sub.2 O.sub.3, or a ceramic composition containing 57-96 mol % of MgO, 2-41 mol % of NiO and 2-41 mol % of TiO.sub.2, and the soft magnetic film is an amorphous alloy film.

摘要翻译： 磁头具有几乎等于形成在其上的软磁膜的热膨胀系数的衬底，并且衬底具有由α-Fe2O3组成的组成或包含57-96mol％的MgO的陶瓷组合物， 2-41mol％的NiO和2-41mol％的TiO 2，软磁膜是非晶合金膜。

公开(公告)号：US4900393A

公开(公告)日：1990-02-13

申请号：US361774

申请日：1989-05-26

申请人： Koichi Kugimiya ,  Ken Hirota ,  Keiichi Matsuyama

发明人： Koichi Kugimiya ,  Ken Hirota ,  Keiichi Matsuyama

IPC分类号： C30B1/02 ,  C30B29/22

CPC分类号： C30B1/026 ,  C30B1/02 ,  C30B29/22

摘要： The invention provides a process for causing growth of single crystal from the junction of a single crystal/polycrystal joined body by a low-temperature heat treatment by making use of the solid-phase growth of crystal. The growth of single crystal can be accomplished staby, with high reliability and in a solid phase by producing a stage satisfies the conditions for abnormal grain growth only at the portion close to the junction, that is, a state in which the joined body is locally kept higher than the grain growth temperature, by making use of the temperature gradient at the junction or the corresponding concentration of the additive.

摘要翻译： 本发明提供了通过利用晶体的固相生长通过低温热处理从单晶/多晶体接合体的接合生长单晶的方法。 单晶的生长可以在高可靠性的条件下实现，并且在固相中通过仅在靠近接合处的部分即即接合体局部地产生满足异常晶粒生长的条件的阶段 通过利用连接处的温度梯度或相应的添加剂浓度，保持高于晶粒生长温度。