Current limiting device
    23.
    发明授权
    Current limiting device 失效
    限流装置

    公开(公告)号:US5614881A

    公开(公告)日:1997-03-25

    申请号:US514076

    申请日:1995-08-11

    摘要: A current limiting device utilizing an electrically conductive composite material and an inhomogeneous distribution of resistance structure is disclosed. The inhomogeneous distribution is typically chosen so that at least one selected thin layer of the current limiting device has much higher resistance than the rest of the current limiting device. In the actual device, pressure is typically exerted on the composite material in a direction normal to the selected thin layer. During a short-circuit, it is believed that adiabatic resistive heating of this selected thin layer is followed by rapid thermal expansion which leads to either a partial or complete physical separation of the current limiting device at the selected thin layer which produces a higher over-all device resistance to electric current flow. Thus the current limiting device limits the flow of current through the short-circuited current path. When the short-circuit is cleared, the current limiting device regains its low resistance state allowing electrical current to flow normally. The current limiting of the present invention is reusable for many such short circuit conditions.

    摘要翻译: 公开了一种使用导电复合材料和电阻结构不均匀分布的限流装置。 通常选择不均匀分布,使得限流装置的至少一个选定的薄层比电流限制装置的其余部分具有高得多的电阻。 在实际的装置中,通常在垂直于所选薄层的方向上对复合材料施加压力。 在短路期间,相信该选择的薄层的绝热电阻加热之后是快速热膨胀,其导致在所选择的薄层处限流器件的部分或完全物理分离,其产生较高的过电压, 所有器件阻抗电流流动。 因此,限流装置限制了通过短路电流路径的电流流动。 当短路被清除时,限流装置恢复其低电阻状态,允许电流正常流动。 本发明的电流限制对于许多这样的短路条件是可重用的。

    Silicon-oxy-carbide glass method of preparation and articles
    27.
    发明授权
    Silicon-oxy-carbide glass method of preparation and articles 失效
    硅 - 碳化硅玻璃的制备方法和制品

    公开(公告)号:US5180694A

    公开(公告)日:1993-01-19

    申请号:US574879

    申请日:1990-08-30

    摘要: Methyl silicone resins are pyrolized in a non-oxidizing atmosphere to form a translucent glass comprised of silicon, oxygen and carbon where silicon atoms are chemically bonded to carbon and oxygen atoms, but there are essentially no chemical bonds between carbon and oxygen atoms. The translucent silicon-oxy-carbide glasses of this invention resist devitrification and decomposition in oxidizing or reducing atmospheres at temperatures of about 1250.degree. C. or greater. Methods for forming silicon-oxy-carbide glass articles are disclosed, along with specific methods for forming silicon-oxy-carbide glass fibres, composites, and cellular structures.

    摘要翻译: 甲基硅氧烷树脂在非氧化性气氛中进行热解,以形成由硅,氧和碳组成的半透明玻璃,其中硅原子与碳和氧原子化学键合,但碳和氧原子之间基本上没有化学键。 本发明的半透明硅 - 碳化碳玻璃在约1250℃或更高的温度下,在氧化或还原气氛中抗失真和分解。 公开了形成硅 - 碳化硅玻璃制品的方法以及形成硅 - 碳化硅玻璃纤维,复合材料和蜂窝结构的具体方法。

    One part heat curable organopolysiloxane compositions
    30.
    发明授权
    One part heat curable organopolysiloxane compositions 失效
    一部分可热固化的有机聚硅氧烷组合物

    公开(公告)号:US5106939A

    公开(公告)日:1992-04-21

    申请号:US627478

    申请日:1990-12-14

    IPC分类号: C08K5/00 C08L83/04

    摘要: Shelf stable heat curable mixtures of vinyl substituted organopolysiloxane fluid and siloxane hydride are provided. The one part polyorganosiloxane mixtures are catalyzed with an inclusion compound of a cyclodextrin and a complex of a cyclopentadiene, 1,5-cyclooctadiene or norbornadiene and a platinum group metal material, such as a C.sub.(1-4) alkyl substituted platinum or a rhodium halide.

    摘要翻译: 提供了乙烯基取代的有机聚硅氧烷流体和硅氧烷氢化物的稳定的稳定的可固化的混合物。 一部分聚有机硅氧烷混合物用环糊精和环戊二烯,1,5-环辛二烯或降冰片二烯的络合物和铂族金属材料如C(1-4)烷基取代的铂或铑的络合物的包合物催化 卤化物。