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    • 14. 发明授权
    • Method of making high T.sub.c superconductor material, and article
produced by the method
    • 制造高Tc超导体材料的方法,以及通过该方法制备的制品
    • US5244868A
    • 1993-09-14
    • US780555
    • 1991-10-15
    • Sungho JinShohei NakaharaThomas H. Tiefel
    • Sungho JinShohei NakaharaThomas H. Tiefel
    • C04B35/45H01L39/14H01L39/24
    • C04B35/4508H01L39/143H01L39/2477Y10S505/725Y10S505/78
    • The disclosed method can produce high T.sub.c superconductor material e.g., YBa.sub.2 Cu.sub.3 O.sub.7) of substantially increased intra-grain critical current density (J'.sub.c), as compared to conventionally produced bulk material of analogous composition. Exemplarily, YBa.sub.2 Cu.sub.3 O.sub.7 pellets produced according to the invention had J'.sub.c of about 10.sup.5 A/cm.sup.2 at 77 K. in an applied magnetic field of 0.9 Telsa. The inventive method comprises providing a precursor material whose composition differs from that of the desired superconductor with respect to at least one of the metal constituents of the desired superconductor. It further comprises heating the precursor material above the decomposition temperature (T.sub.d) of the precursor material such that a multiphase material results. The multiphase material comprises, in addition to a majority first phase, a dispersed precipitate phase. The method further comprises cooling the multiphase material to a temperature below T.sub.d at a rate such that at least a major portion of the precipitate phase is retained. The first phase differs from the desired superconductor at most with regard to oxygen content, and the heat treatment of the multiphase material is carried out such that the desired superconductor results. Exemplarily, the desired superconductor is YBa.sub.2 Cu.sub.3 O.sub.7, the precursor material has average composition YBa.sub.2 Cu.sub.4 O.sub.z (z.about.8), the precipitate phase comprises one or more copper oxides, T.sub.d is about 860.degree. C., and the multiphase material is produced at 920.degree. C.
    • 与常规制备的类似组合物的本体材料相比,所公开的方法可以产生显着增加的晶粒内临界电流密度(J'c)的高Tc超导体材料,例如YBa2Cu3O7)。 示例性地,根据本发明制备的YBa2Cu3O7颗粒在0.9Telsa的施加磁场中在77K下具有约105A / cm 2的J'c。 本发明的方法包括提供与期望的超导体的至少一种金属组分的组成不同于所需超导体的组成的前体材料。 其还包括将前体材料加热到高于前体材料的分解温度(Td),从而得到多相材料。 多相材料除了大多数第一相之外还包含分散的沉淀相。 该方法还包括以使得至少大部分沉淀相被保留的速率将多相材料冷却至低于Td的温度。 第一阶段相对于氧含量最多不同于期望的超导体,并且进行多相材料的热处理,使得期望的超导体结果。 示例性地,期望的超导体是YBa2Cu3O7,前体材料具有平均组成YBa2Cu4Oz(z DIFFERENCE 8),沉淀相包含一种或多种氧化铜,Td约为860℃,多相材料在920℃下生产。
    • 18. 发明授权
    • Method for making a high remanence Fe-Mo-Ni magnetic element
    • 制造高残留Fe-Mo-Ni磁性元件的方法
    • US4415380A
    • 1983-11-15
    • US364624
    • 1982-04-01
    • Sungho JinThomas H. Tiefel
    • Sungho JinThomas H. Tiefel
    • C21D8/12C22C38/08C22C38/12H01F1/04H01F1/02
    • H01F1/04C21D8/1244C22C38/08C22C38/12C21D8/1233
    • Magnetically actuated devices such as, e.g., switches and synchronizers typically comprise a magnetically semihard component having a square B-H hysteresis loop and high remanent induction. Among alloys having such properties are Co-Fe-V, Co-Fe-Nb, and Co-Fe-Ni-Al-Ti alloys which, however, contain undesirably large amounts of cobalt.According to the invention, devices are equipped with a magnetically semihard, high-remanence Fe-Mo-Ni alloy which comprises Mo in a preferred amount in the range of 2-26 weight percent and Ni in a preferred amount in the range of 0.5-15 weight percent.Magnets made from alloys of the invention may be shaped, e.g., by cold drawing, rolling, bending, or flattening and may be used in devices such as, e.g., electrical contact switches, hysteresis motors, and other magnetically actuated devices.Preparation of alloys of the invention may be by a treatment of annealing and aging or deformation and aging.
    • 诸如开关和同步器的磁致动器件通常包括具有平方B-H磁滞回线和高剩磁感应的磁半硬件部件。 在具有这种性能的合金中,Co-Fe-V,Co-Fe-Nb和Co-Fe-Ni-Al-Ti合金,然而,其含有不期望的大量的钴。 根据本发明,装置配备有磁半硬,高剩余的Fe-Mo-Ni合金,其包含优选量在2-26重量%范围内的Mo和0.5重量%的优选量的Mo, 15重量%。 由本发明的合金制成的磁体可以例如通过冷拉伸,轧制,弯曲或平坦化成形,并且可以用于例如电接触开关,磁滞电动机和其它磁致动装置的装置中。 本发明的合金的制备可以通过处理退火和老化或变形和老化。
    • 19. 发明授权
    • Isotropic and nearly isotropic permanent magnet alloys
    • 各向同性和几何各向同性永磁合金
    • US4340435A
    • 1982-07-20
    • US197970
    • 1980-10-17
    • Sungho JinThomas H. Tiefel
    • Sungho JinThomas H. Tiefel
    • C22C38/00C22C38/12H01F1/04C04B35/00
    • C22C38/12H01F1/04
    • To provide for an inexpensive magnet alloy, isotropic and nearly isotropic permanent magnet properties are developed in Fe-Mo-Ni alloys. Manufacture may be by a method which comprises steps of annealing, optional deforming by a limited amount, and aging.Typical magnetic properties of alloys of the invention are a coercive force in the range of 50-500 oersted, a magnetic remanence in the range of 7000-14,000 gauss, and a magnetic squareness ratio of less than 0.9. Alloys of the invention are highly ductile even after plastic deformation, they are readily bonded to aluminum supports (as used, e.g., in the manufacture of twistor memories), and they are readily etched by etchants which leave aluminum unaffected.
    • 为了提供廉价的磁体合金,在Fe-Mo-Ni合金中开发出各向同性和几乎各向同性的永磁体性能。 制造可以通过包括退火步骤,任选的有限量的变形和老化的方法。 本发明的合金的典型磁性是50-500奥斯特的矫顽力,7000-14000高斯范围内的磁剩磁,磁矩比小于0.9。 本发明的合金即使在塑性变形之后也具有高延展性,它们易于粘合到铝支架上(例如用于制造二极管存储器),并且它们容易地被不会影响铝的蚀刻剂蚀刻。