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    • 5. 发明申请
    • STRUCTURE AND METHOD FOR COMPACTION OF POWDER-LIKE MATERIALS
    • 粉末状材料的结构与方法
    • WO1998006525A2
    • 1998-02-19
    • PCT/US1997010559
    • 1997-06-19
    • IAP RESEARCH, INC.
    • IAP RESEARCH, INC.BARBER, John, P.
    • B22F00/00
    • H01L39/248B22F3/005B22F3/087B22F3/105B22F3/14B22F2203/01B22F2998/00C04B35/45C04B35/645
    • Structure and a method for producing very dense bodies of material from particulate materials. A particulate material is placed within an electrically conductive container. A solenoid or coil encompasses the electrically conductive container, and a large magnitude of electrical current is caused to flow through the solenoid or coil. As the electrical current flows through the solenoid or coil, large magnitudes of magnetic pressures are created upon the electrically conductive container, and the electrically conductive container is compressed, and the transverse dimension thereof is reduced. Thus, the particulate material within the electrically conductive container is very firmly compacted, and a rigid body of material is provided. Any one of numerous types of particulate material may be employed. For example, a body of electrical superconductive material of any desired size and shape can be produced by this method by the use of superconducting particulate material. A method and system for selecting various parameters which enable the material to be "over-pressure" and densified to densities in excess of 90 % of the material's maximum density is also illustrated in another embodiment of the invention. The various parameters include establishing a stand-off distance, a container wall density and thickness, a fill density and a compressibility value for the material. Once the various parameters are established and for a selected material, the material is magnetically compacted to over-pressure the material to a pressure level which exceeds the pressure applied by a wall of the container. This, in turn, enables the system and method to densify the material to densities in excess of 90 % of its maximum density.
    • 用于从颗粒材料生产非常致密的材料的结构和方法。 将颗粒材料放置在导电容器内。 电磁线圈或线圈包围导电容器,并且使大的电流流过螺线管或线圈。 当电流流过螺线管或线圈时,在导电容器上产生大的磁压力,并且导电容器被压缩,并且其横向尺寸减小。 因此,导电容器内的颗粒材料非常牢固地压实,并且提供了刚体材料。 可以使用多种类型的颗粒材料中的任何一种。 例如,通过使用超导颗粒材料,可以通过该方法制造任何所需尺寸和形状的电极超导材料体。 在本发明的另一个实施例中还示出了用于选择能使材料“超压”并且致密化到超过材料最大密度的90%的密度的各种参数的方法和系统。 各种参数包括确定材料的间隔距离,容器壁密度和厚度,填充密度和压缩性值。 一旦建立了各种参数并且对于所选择的材料,材料被磁力压实以将材料过压到超过由容器的壁施加的压力的压力水平。 这又使系统和方法使材料的密度达到其最大密度的90%以上。
    • 7. 发明申请
    • STRONGLY-LINKED OXIDE SUPERCONDUCTOR AND A METHOD OF ITS MANUFACTURE
    • 强连接氧化物超导体及其制造方法
    • WO1993023884A1
    • 1993-11-25
    • PCT/US1993003571
    • 1993-04-13
    • AMERICAN SUPERCONDUCTOR CORPORATION
    • AMERICAN SUPERCONDUCTOR CORPORATIONMASUR, Lawrence, J.PODTBURG, Eric, R.
    • H01L39/24
    • C04B35/65C04B35/45H01L39/2419H01L39/2477Y10S505/704Y10S505/736Y10S505/74Y10S505/742Y10S505/776Y10S505/78Y10S505/813Y10T29/49014
    • A strongly-linked polycrystalline oxide superconductor article includes an oxide superconductor selected from the group consisting of 124-type and 247-type oxide superconductors having fine, highly aligned oxide superconductor grains less than 50 mu m along a longest dimension. The oxide superconductor article has at least a 25 % retention of critical current density in a 0.1 Tesla field. A method for preparing a strongly-linked oxide superconductor includes shaping a finely divided metallic precursor of an oxide superconductor; oxidizing the finely divided metallic precursor to produce a finely divided sub-oxide species while avoiding conversion of an appreciable amount of the sub-oxide species into the oxide superconductor; annealing and deforming the article, in either order, the annealing carried out at a temperature and for a time sufficient to convert some of the sub-oxide species into fine grains of the oxide superconductor thereby forming a mixture of sub-oxide species and oxide superconductor and the deformation carried out such that the fine grains of oxide superconductor are rotated into alignment parallel to an intended current carrying direction of the article without fracturing or pulverization of the oxide superconductor grains; alternating annealing and deformation of the article until no further improvement in alignment is observed; and subjecting the aligned grains to a final anneal in order to react any remaining sub-oxide species and maximize the growth and sintering of existing aligned grains.
    • 强连接的多晶氧化物超导体制品包括选自124型和247型氧化物超导体的氧化物超导体,其具有沿着最长尺寸小于50微米的精细高度排列的氧化物超导体颗粒。 氧化物超导体制品在0.1特斯拉场中具有至少25%的临界电流密度保留。 一种制备强连接的氧化物超导体的方法包括使细分的氧化物超导体的金属前体成形; 氧化细碎的金属前体以产生细碎的亚氧化物物质,同时避免将相当数量的亚氧化物物质转化成氧化物超导体; 对制品进行退火和变形,以任何顺序进行退火,该退火在足以将一些氧化物种类转化为氧化物超导体的细晶粒的温度和时间下进行,从而形成次氧化物种类和氧化物超导体的混合物 并且进行变形,使得氧化物超导体的细晶粒在不破坏或粉碎氧化物超导体晶粒的同时使其平行于制品的预期电流方向旋转成对准; 交替退火和变形,直到观察不到进一步改善; 并使对准的晶粒进行最终退火,以使任何剩余的亚氧化物物质反应并使现有对准晶粒的生长和烧结最大化。