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    Method of purifying single wall carbon nanotubes
    3.
    发明授权
    Method of purifying single wall carbon nanotubes 失效

    公开(公告)号：US07135158B2

    公开(公告)日：2006-11-14

    申请号：US10166386

    申请日：2002-06-11

    申请人： Hajime Goto ,  Terumi Furuta ,  Yoshiya Fujiwara ,  Toshiyuki Ohashi

    发明人： Hajime Goto ,  Terumi Furuta ,  Yoshiya Fujiwara ,  Toshiyuki Ohashi

    IPC分类号： D01F9/12

    CPC分类号： B82Y30/00 ,  D01F9/12 ,  Y10S977/844

    摘要： There is provided a method of purifying single wall carbon nanotubes so as to be able to remove impurities such as a metal catalyst to obtain the single wall carbon nanotubes with high purity. The method includes the first oxidizing step of oxidizing the single wall carbon nanotubes soot 1 containing an impurity with a metal catalyst 2, the first refluxing step of refluxing the single wall carbon nanotubes soot 1 obtained by the first oxidizing step in an acid solution, the second oxidizing step of oxidizing the single wall carbon nanotubes soot 1 obtained by the first refluxing step, and the second refluxing step of refluxing the single wall carbon nanotubes obtained soot 1 by the second oxidizing step in an acid solution. The single wall nanotubes 1 are synthesized by an arc discharge with a carbon electrode containing a metal catalyst 2. The carbon electrode contains a metal catalyst which consists of Ni, Y, and Ti. The first oxidizing step is performed by heating at a temperature between 350 and 600° C. or by a wet-oxidization in hydrogen peroxide solution. The first refluxing step is performed by refluxing in nitric acid. The second oxidizing step is performed by wet-oxidizing in hydrogen peroxide. The second refluxing step is performed by refluxing in hydrochloric acid.

    Purification of carbon filaments and their use in storing hydrogen
    4.
    发明授权
    Purification of carbon filaments and their use in storing hydrogen 失效
    碳丝的净化及其在储存氢气中的应用

    公开(公告)号：US06869583B2

    公开(公告)日：2005-03-22

    申请号：US10120827

    申请日：2002-04-12

    申请人： Avetik Harutyunyan ,  Bhabendra Pradhan ,  Peter C. Eklund ,  Yoshiya Fujiwara ,  Hajime Goto

    发明人： Avetik Harutyunyan ,  Bhabendra Pradhan ,  Peter C. Eklund ,  Yoshiya Fujiwara ,  Hajime Goto

    IPC分类号： C01B3/00 ,  C01B31/02 ,  D01F9/12 ,  D01F9/127

    CPC分类号： B82Y30/00 ,  B82Y40/00 ,  C01B3/001 ,  C01B3/0021 ,  C01B32/17 ,  C01B2202/02 ,  D01F9/12 ,  Y02E60/325 ,  Y02E60/327 ,  Y10S977/848

    摘要： Carbon structures, e.g. carbon nano-fibers, suitable for absorbing hydrogen at low pressures and low temperatures are produced by a selective oxidation and/or acid reflux process. The process includes heating an impure mixture containing a crystalline form of carbon in the presence of an oxidizing gas at a temperature and time sufficient to selectively oxidize and remove a substantial amount of any amorphous carbon impurities from the mixture. Metal containing impurities can be removed from the mixture by exposing the desired carbon and accompanying impurities to an acid to produce a carbon fiber that is substantially free of both non-fiber carbon impurities and metal impurities. Another aspect of the present invention includes purified carbon structures that can store hydrogen at low pressures and temperatures.

    摘要翻译： 碳结构，例如 通过选择性氧化和/或酸回流过程产生适合于在低压和低温下吸收氢的碳纳米纤维。 该方法包括在氧化气体存在下加热含有结晶形式的不纯的混合物，该温度和时间足以选择性氧化和从混合物中除去大量的任何无定形碳杂质。 通过将所需的碳和伴随的杂质暴露于酸中以产生基本上不含非纤维碳杂质和金属杂质的碳纤维，可以从混合物中除去含金属杂质。 本发明的另一方面包括可以在低压和低温下储存氢的纯化碳结构。

    High strength and high ductility tial-based intermetallic compound and process for producing the same
    5.
    发明授权
    High strength and high ductility tial-based intermetallic compound and process for producing the same 失效
    高强度和高延展性的金属间化合物及其制备方法

    公开(公告)号：US5514333A

    公开(公告)日：1996-05-07

    申请号：US273536

    申请日：1994-07-11

    申请人： Yoshiya Fujiwara ,  Toshio Tokune

    发明人： Yoshiya Fujiwara ,  Toshio Tokune

    IPC分类号： C22C14/00

    CPC分类号： C22C14/00

    摘要： A high strength and high ductility TiAl-based intermetallic compound includes a content of aluminum in a range represented by 42.0 atom %.ltoreq.Al.ltoreq.50.0 atom %, a content of vanadium in a range represented by 1.0 atom %.ltoreq.V.ltoreq.3.0 atom %, a content of niobium in a range represented by 1.0 atom %.ltoreq.Nb.ltoreq.10.0 atom %, a content of boron in a range represented by 0.03 atom %.ltoreq.B.ltoreq.2.2 atom %, and the balance of titanium and unavoidable impurities. A product of the TiAl-based intermetallic compound is formed by only casting or casting followed by a homogenizing thermal treatment.

    摘要翻译： 高强度和高延展性的TiAl基金属间化合物包括由42.0原子％Al≤50.0原子％表示的范围内的铝含量，以1.0原子％表示的范围内的钒的含量< V <3.0原子％，以1.0原子％表示的范围内的铌的含量<10.0原子％，以0.03原子％表示的范围内的硼的含量

    TiAl-based intermetallic compound with excellent high temperature strength
    6.
    发明授权
    TiAl-based intermetallic compound with excellent high temperature strength 失效
    TiAl基金属间化合物具有优异的高温强度

    公开(公告)号：US5431754A

    公开(公告)日：1995-07-11

    申请号：US131884

    申请日：1993-10-05

    申请人： Yoshiya Fujiwara ,  Toshio Tokune

    发明人： Yoshiya Fujiwara ,  Toshio Tokune

    IPC分类号： C22C14/00 ,  C22F1/00 ,  C22F1/18

    CPC分类号： C22F1/183

    摘要： A TiAl-based intermetallic compound has a metallographic structure which includes a region A having fine .beta.-phases dispersed in a .gamma.-phase. The volume fraction Vf of the .beta.-phases in the region A is set equal to or more than 0.1% (Vf.gtoreq.0.1%). Thus, the .beta.-phases can exhibit a pinning effect to prevent a transgranular pseudo cleavage fracture in the .gamma.-phase, thereby providing an enhanced high-temperature strength of the TiAl-based intermetallic compound.

    摘要翻译： TiAl基金属间化合物具有金相组织，其包括具有分散在γ相中的微细β-相的区域A. 区域A中β相的体积分数Vf设定为等于或大于0.1％（Vf> / = 0.1％）。 因此，β相可以表现出钉扎效应，以防止在γ相中的晶粒间裂纹断裂，从而提供TiAl基金属间化合物的增强的高温强度。