Transversely reinforced piezoelectric composites
    1.
    发明授权
    Transversely reinforced piezoelectric composites 失效
    横向增强压电复合材料

    公开(公告)号:US4613784A

    公开(公告)日:1986-09-23

    申请号:US684529

    申请日:1984-12-21

    IPC分类号: H01L41/18 H01L41/08

    摘要: Piezoelectric PZT-polymer composites of 1-3 and 1-3-0 connectivity are trversely reinforced with glass fibers to increase the hydrostatic piezoelectric charge and voltage coefficients (d.sub.h and g.sub.h) for possible use in hydrophone applications. These composites consisted of a foamed (with porosity) or non-foamed (no porosity) polymer matrix with PZT rods aligned parallel to the poling direction and glass fibers in the remaining two transverse directions. Because of the small percentage of PZT required, these composites have densities near that of water, and much lower dielectric constants than solid PZT, resulting in large increases in the hydrostatic piezoelectric voltage coefficient g.sub.h. By increasing the d.sub.h and g.sub.h coefficients, the d.sub.h g.sub.h product, used as the figure of merit, is greatly enhanced.

    摘要翻译: 使用1-3和1-3-0连接的压电PZT聚合物复合材料用玻璃纤维横向增强,以增加液压压电充电和电压系数(&upbar&dh和&upbar&gh),可用于水听器应用。 这些复合材料由具有平行于极化方向排列的PZT棒的发泡(具有孔隙)或非发泡(无孔隙)聚合物基质组成,而玻璃纤维在剩余的两个横向方向上组成。 由于所需的PZT的百分比很小,这些复合材料的密度接近于水,而且固体PZT的介电常数要低得多,导致静压压电压系数和上限的增大。 通过增加&upbar&dh和&upbar&gh系数,用作品质因数的&upbar&dh&upbar&gh产品大大增强。

    Perforated PZT polymer composites
    2.
    发明授权
    Perforated PZT polymer composites 失效
    穿孔PZT聚合物复合材料

    公开(公告)号:US4422003A

    公开(公告)日:1983-12-20

    申请号:US408320

    申请日:1982-08-16

    IPC分类号: H01L41/18 H01L41/08

    摘要: Composites of lead zirconate titanate (PZT) and inactive polymers with 3-1 and 3-2 patterns and a method of fabrication thereof are described. Fabrication is accomplished by drilling holes in sintered PZT blocks and filling the holes with epoxy or some other inactive polymer. The influence of hole size and volume fraction PZT on the hydrostatic properties of the composite is evaluated. By decoupling the piezoelectric coefficients d.sub.33 and d.sub.31 in the composite, the hydrostatic coefficients are greatly enhanced.

    摘要翻译: 描述了锆钛酸铅(PZT)和具有3-1和3-2图案的无活性聚合物的复合材料及其制造方法。 通过在烧结的PZT块中钻孔并用环氧树脂或一些其它无活性聚合物填充孔来实现加工。 评估孔尺寸和体积分数PZT对复合材料静液压性能的影响。 通过对复合材料中的压电系数d33和d31进行解耦,静水系数大大提高。

    Process for preparing a thallium-containing superconductor
    5.
    发明授权
    Process for preparing a thallium-containing superconductor 失效
    制备含铊超导体的方法

    公开(公告)号:US5385882A

    公开(公告)日:1995-01-31

    申请号:US966019

    申请日:1992-12-09

    IPC分类号: C01G3/00 H01B12/00 H01L39/12

    摘要: There is disclosed a process for preparing a thallium-containing superconductive composition. In the first step of the process, a mixture of an inorganic salt (such as potassium chloride) and a powder compositon is provided; the powder composition contains at least three separate compounds which, in combination, correspond to the stoichiometry of the super-conductor to be produced. This mixture is then charged to a closed container, raised to a temperature of from 800-959 degrees Centigrade, and heated for from about 1 to about 12 hours; thereafter, it is cooled to a temperature of 600 degrees Centigrade at a rate of at least 300 degrees Celsius per hour.

    摘要翻译: 公开了一种制备含铊的超导组合物的方法。 在该方法的第一步中,提供无机盐(如氯化钾)和粉末组合物的混合物; 粉末组合物含有至少三种分开的化合物,其组合对应于待生产的超导体的化学计量。 然后将该混合物装入密封容器中,升温至800-959摄氏度的温度,并加热约1至约12小时; 然后以至少300摄氏度/小时的速度将其冷却至600摄氏度的温度。