Automatic planning machine
    22.
    发明授权
    Automatic planning machine 失效
    自动规划机

    公开(公告)号:US5174348A

    公开(公告)日:1992-12-29

    申请号:US751747

    申请日:1991-08-29

    IPC分类号: B27C1/12

    CPC分类号: B27C1/12

    摘要: An automatic planning machine has a vertical stationary stool functioning to cut a workpiece flatly and a vertical movable stool opposed to the stationary stool. The stationary stool has a plurality of feed rollers while the movable stool has a plurality of pressure rollers. A pressure force by the pressure rollers can be selectively changed over thereby to push the workpiece on the stationary stool at the time of flat work and to push the workpiece on the movable stool at the time of thickness determination work.

    Grain boundary layer dielectric ceramic compositions
    24.
    发明授权
    Grain boundary layer dielectric ceramic compositions 失效
    晶界层介电陶瓷组合物

    公开(公告)号:US4362637A

    公开(公告)日:1982-12-07

    申请号:US249885

    申请日:1981-04-01

    摘要: Grain boundary layer dielectric ceramic compositions comprising semiconductive ceramic grains having a composition of 50.23 to 49.47 mol % of SrO and CaO, 49.72 to 50.23 mol % of TiO.sub.2, 0.05 to 0.3 mol % of Nb.sub.2 O.sub.5, substantially each of said grains being surrounded by grain boundary layer dielectric materials which are formed by grain boundary diffusion of a mixture having a composition of 93.5 to 8.5 mol % of Bi.sub.2 O.sub.3, 4.5 to 45 mol % of Cu.sub.2 O, 0.5 to 4 mol % of MnO.sub.2, 1 to 8.5 mol % of B.sub.2 O.sub.3, 0.5 to 17 mol % of La.sub.2 O.sub.3, and below 17 mol % of TiO.sub.2.These ceramic compositions provide capacitors having a temperature coefficient of capacitance less than .+-.15%, an apparent dielectric constant higher than 35,000, a dielectric loss less than 0.01 and a breakdown voltage higher than 500 V/mm; or capacitors having a temperature coefficient of capacitance less than .+-.10%, an apparent dielectric constant higher than 20,000, a dielectric loss less than 0.01 and a breakdown voltage higher than 700 V/mm; or capacitors having a temperature coefficient of capacitance less than .+-.5%, an apparent dielectric constant higher than 5,000, a dielectric loss less than 0.01 and a breakdown voltage higher than 700 V/mm.

    摘要翻译: 包含组成为SrO和CaO的组成为50.23〜49.47摩尔%的二氧化铈,49.72〜50.23摩尔%的TiO 2,0.05〜0.3摩尔%的Nb 2 O 5的半导体陶瓷颗粒的晶界层介电陶瓷组合物,基本上每个所述晶粒被晶界包围 由Bi2O3为93.5〜8.5mol%,Cu2O为4.5〜45mol%,MnO2为0.5〜4mol%,B2O3为1〜8.5mol%,B2O3为0.5的混合物的晶界扩散形成的层间介电材料 至17mol%的La 2 O 3,以及低于17mol%的TiO 2。 这些陶瓷组合物提供具有小于+/- 15%的电容温度系数,高于35,000的表观介电常数,小于0.01的介电损耗和高于500V / mm的击穿电压的电容器; 或具有小于+/- 10%的电容温度系数的电容器,高于20,000的表观介电常数,小于0.01的介电损耗和高于700V / mm的击穿电压; 或具有小于+/- 5%的电容温度系数的电容器,高于5,000的表观介电常数,小于0.01的介质损耗和高于700V / mm的击穿电压。