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    Superplastic forming of YBa.sub.2 Cu.sub.3 O.sub.7-x ceramic superconductors with or without silver addition
    3.
    发明授权
    Superplastic forming of YBa.sub.2 Cu.sub.3 O.sub.7-x ceramic superconductors with or without silver addition 失效
    具有或不含银添加的YBa2Cu3O7-x陶瓷超导体的超塑性成型

    公开(公告)号：US5284823A

    公开(公告)日：1994-02-08

    申请号：US753914

    申请日：1991-09-03

    申请人： Ye T. Chou ,  Martin P. Harmer ,  Jondo Yun

    发明人： Ye T. Chou ,  Martin P. Harmer ,  Jondo Yun

    IPC分类号： C04B35/45 ,  C04B35/622 ,  H01L39/24 ,  H01L39/12

    CPC分类号： H01L39/2419 ,  C04B35/4508 ,  C04B35/622 ,  Y10S505/739 ,  Y10S505/78

    摘要： A process for superplastically forming and shaping a solid object including 123 superconductor, including preparing a solid object having grains of 123 superconductor that have an average grain size of less than 10 microns, and superplastically deforming the prepared solid object by heating the solid object to between 500.degree. and 1015.degree. C. while simultaneously applying to said solid object stress which is less than the fracture strength of the solid object, thereby producing a strain rate in the solid object. The solid object may be a composite including silver or gold.

    摘要翻译： 一种用于超塑性地形成和成形包括123超导体的固体物体的方法，包括制备具有平均粒径小于10微米的123超导体颗粒的固体物体，并且通过将固体物体加热至 500度和1015摄氏度，同时施加到小于固体物体的断裂强度的所述固体物体应力，从而在固体物体中产生应变率。 固体物质可以是包含银或金的复合物。

    Single crystal conversion process
    4.
    发明申请
    Single crystal conversion process 审中-公开
    单晶转换工艺

    公开(公告)号：US20090211514A1

    公开(公告)日：2009-08-27

    申请号：US12072355

    申请日：2008-02-26

    申请人： Shen J. Dillon ,  Martin P. Harmer

    发明人： Shen J. Dillon ,  Martin P. Harmer

    IPC分类号： C30B1/02

    CPC分类号： C30B29/20 ,  C30B1/04

    摘要： A solid state method for converting polycrystalline alumina components to single crystal or sapphire. The single crystal conversion method includes sintering a pre-fired polycrystalline alumina component doped with a magnesia sintering aid in an atmosphere containing a gas mixture of hydrogen and an inert gas, such as nitrogen in one embodiment. A sintering temperature is selected that preferably depends on the percentage of hydrogen selected. The component is held at the sintering temperature for a time sufficient to convert the polycrystalline component into a component formed of a single crystal. In one embodiment, the sintering temperature may be between at least about 1600° C. and less than 2050° C., and the amount of hydrogen in the sintering atmosphere may be between about 4% to about 10%. The method forms a wetting type intergranular film associated with the nucleation and growth of a single abnormal grain in the polycrystalline alumina component.

    摘要翻译： 用于将多晶氧化铝组分转化为单晶或蓝宝石的固态方法。 单晶转化方法包括在一个实施方案中，在包含氢气和惰性气体（例如氮气）的气体混合物的气氛中烧结掺有氧化镁烧结助剂的预焙烧多晶氧化铝组分。 选择优选取决于所选择的氢的百分比的烧结温度。 将组分在烧结温度下保持足以将多晶组分转化为由单晶形成的组分的时间。 在一个实施方案中，烧结温度可以在至少约1600℃至小于2050℃之间，并且烧结气氛中的氢的量可以在约4％至约10％之间。 该方法形成与多晶氧化铝组分中单个异常晶粒的成核和生长相关的润湿型晶间膜。

    Methods for decontamination of powders
    5.
    发明授权
    Methods for decontamination of powders 有权
    粉末去污方法

    公开(公告)号：US08440584B1

    公开(公告)日：2013-05-14

    申请号：US13334829

    申请日：2011-12-22

    申请人： Animesh Kundu ,  Martin P. Harmer

    发明人： Animesh Kundu ,  Martin P. Harmer

    IPC分类号： C04B41/00

    CPC分类号： F41H5/0407 ,  C01B13/16 ,  C01F7/162 ,  C01P2006/60 ,  C01P2006/80 ,  C04B35/443 ,  C04B35/6268 ,  C04B35/645 ,  C04B2235/72 ,  C04B2235/724 ,  C04B2235/726 ,  C04B2235/727 ,  C04B2235/9653

    摘要： Provided herein are methods and apparatus to remove unwanted elements in commercial powders, and particularly in commercial powders that include one or more of a crystalline ceramic oxide. The methods involve treating powders in reduced pressure atmosphere, such as a vacuum, with or without heating, for a period of time sufficient to remove impurities. Impurities and contaminants, including anionic species, are removed from the powders without any undesirable changes in the physical characteristics of the starting material, such as particle size and particle size distribution, surface area, and volume, for example. The resulting purified powder starting material can be consolidated without the need for any sintering aids such as LiF to produce nearly colorless, extremely transparent polycrystalline articles that approach identical properties and performance of single crystal spinels.

    摘要翻译： 本文提供了去除商业粉末中的不需要的元素的方法和装置，特别是在包括结晶陶瓷氧化物中的一种或多种的商业粉末中。 所述方法包括在减压或低温气氛中处理粉末，例如真空，加热或不加热，持续一段足以除去杂质的时间。 杂质和污染物（包括阴离子物质）从粉末中除去，例如，起始材料的物理特性如颗粒尺寸和粒度分布，表面积和体积没有任何不期望的变化。 所得到的纯化粉末起始材料可以被固结，而不需要诸如LiF的任何烧结助剂，以产生接近单晶尖晶石相同特性和性能的几乎无色，极透明的多晶制品。