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    Production method of polycrystalline ceramic body
    11.
    发明申请
    Production method of polycrystalline ceramic body 失效
    多晶陶瓷体的生产方法

    公开(公告)号：US20060091588A1

    公开(公告)日：2006-05-04

    申请号：US11258356

    申请日：2005-10-25

    申请人： Masaya Nakamura ,  Toshiatsu Nagaya ,  Tatsuhiko Nonoyama ,  Hisaaki Takao ,  Yasuyoshi Saito ,  Takahiko Homma ,  Kazumasa Takatori

    发明人： Masaya Nakamura ,  Toshiatsu Nagaya ,  Tatsuhiko Nonoyama ,  Hisaaki Takao ,  Yasuyoshi Saito ,  Takahiko Homma ,  Kazumasa Takatori

    IPC分类号： C04B33/32

    CPC分类号： C04B35/495 ,  C04B35/6303 ,  C04B2235/3201 ,  C04B2235/3203 ,  C04B2235/3251 ,  C04B2235/3255 ,  C04B2235/3267 ,  C04B2235/3291 ,  C04B2235/3294 ,  C04B2235/3298 ,  C04B2235/5292 ,  C04B2235/5296 ,  C04B2235/5436 ,  C04B2235/5445 ,  C04B2235/6025 ,  C04B2235/6562 ,  C04B2235/6565 ,  C04B2235/768 ,  C04B2235/77 ,  C04B2235/787 ,  C04B2235/9615 ,  H01L41/1873 ,  H01L41/43

    摘要： To provide a production method of a polycrystalline ceramic body with excellent density, a preparation step, a mixing step, a forming step and a heat-treating step are performed. In the preparation step, a coarse particle ceramic powder, and a fine particle powder having an average particle diameter of ⅓ or less of the average particle diameter of the coarse particle ceramic powder are prepared. In the mixing step, the coarse particle ceramic powder and the fine particle powder are mixed to produce a raw material mixture. In the forming step, the raw material mixture is formed to a shaped body. In the heat-treating step, the shaped body is heated and thereby sintered to produce a polycrystalline ceramic body. In the heat-treating step, a temperature elevating process and a first holding process are performed and at the same time, a second holding process and/or a cooling process are performed. In the temperature elevating process, heating is started to elevate the temperature and in the first holding process, the shaped body is held at a temperature T1° C. In the second holding process, the shaped body is held at a temperature T2° C. lower than the temperature T1° C. In the cooling process, the shaped body is cooled at a temperature dropping rate of 60° C./h or less from the temperature T1° C.

    摘要翻译： 为了提供具有优异密度的多晶陶瓷体的制造方法，进行制备步骤，混合步骤，成形步骤和热处理步骤。 在制备步骤中，制备粗颗粒陶瓷粉末和平均粒径为粗颗粒陶瓷粉末的平均粒径的1/3以下的细颗粒粉末。 在混合步骤中，将粗颗粒陶瓷粉末和细颗粒粉末混合以制备原料混合物。 在成形步骤中，将原料混合物形成为成形体。 在热处理工序中，加热成形体，由此烧结而制成多晶体。 在热处理步骤中，进行升温处理和第一保持处理，同时进行第二保持处理和/或冷却处理。 在升温过程中，加热开始升温，在第一保持过程中，成形体保持在T1℃的温度。在第二保持过程中，成形体保持在T2℃的温度。 低于温度T1℃。在冷却过程中，成形体从温度T1℃以60℃/小时以下的降温速度冷却。

    Crystal-oriented ceramics, piezoelectric ceramics using the same, and methods for producing the same
    15.
    发明授权
    Crystal-oriented ceramics, piezoelectric ceramics using the same, and methods for producing the same 有权
    晶体取向陶瓷，使用其的压电陶瓷及其制造方法

    公开(公告)号：US6093338A

    公开(公告)日：2000-07-25

    申请号：US136420

    申请日：1998-08-20

    申请人： Toshihiko Tani ,  Tsuguto Takeuchi ,  Yasuyoshi Saito

    发明人： Toshihiko Tani ,  Tsuguto Takeuchi ,  Yasuyoshi Saito

    IPC分类号： G01L1/16 ,  C04B35/00 ,  C04B35/46 ,  C04B35/462 ,  C04B35/495 ,  H01L41/187 ,  C04B35/475 ,  C04B35/491 ,  C04B35/622

    CPC分类号： C04B35/495 ,  C04B35/462 ,  H01L41/1871 ,  H01L41/1878 ,  H01L41/43

    摘要： A crystal-oriented ceramic has an isotropic or pseudoisotropic perovskite-type-structure of not smaller than 10% in Lotgering orientation degree. The ceramic may contain at least one of Bi, Sr and Ca. A host material, a raw material capable of producing a guest material and an additive having the ability of converting a host material into a guest material are mixed and roll-pressed, and sintered under heat to give the crystal-oriented ceramic as a large-sized and bulky material. This crystal-oriented ceramic has good crystal orientation-dependent characteristics including piezoelectricity, pyroelectricity, ionic conductivity, giant magneto-resistivity effect, etc. This crystal-oriented ceramic can be produced by orienting epitaxially the polycrystals of an isotropic or pseudoisotropic perovskite oxide according to the orientation of the crystal plane or axis of a host material. The ceramic can be applied to an inexpensive and large-sized device. The host material may be a magnetoplumbite-type-structured or Sr.sub.2 Nb.sub.2 O.sub.7 -type-structured material, and may be composed of morphologically-anisotropic grains.

    摘要翻译： 晶体取向陶瓷具有不等于10％的Lotogering取向度的各向同性或拟各向异性的钙钛矿型结构。 陶瓷可能含有Bi，Sr和Ca中的至少一种。 将主体材料，能够生产客体材料的原料和具有将主体材料转化为客体材料的能力的添加剂混合并辊压，并在加热下烧结，得到晶体取向陶瓷作为大尺寸陶瓷， 尺寸和体积大的材料。 这种晶体取向陶瓷具有良好的晶体取向特性，包括压电性，热电性，离子导电性，巨磁阻效应等。该晶体取向陶瓷可以通过外延取向各向同性或拟各向异性的钙钛矿氧化物的多晶根据 主体材料的晶面或轴的取向。 陶瓷可以应用于廉价和大尺寸的装置。 主体材料可以是磁铅石型结构或Sr2Nb2O7型结构材料，并且可以由形态各向异性晶粒组成。