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    Silicon nitride sintered body, silicon nitride ball, silicon nitride bearing ball, ball bearing, motor having bearing, hard disk drive, and polygon scanner
    1.
    发明申请
    Silicon nitride sintered body, silicon nitride ball, silicon nitride bearing ball, ball bearing, motor having bearing, hard disk drive, and polygon scanner 审中-公开
    氮化硅烧结体，氮化硅球，氮化硅轴承球，滚珠轴承，具有轴承的电动机，硬盘驱动器和多边形扫描器

    公开(公告)号：US20020037803A1

    公开(公告)日：2002-03-28

    申请号：US09908661

    申请日：2001-07-20

    申请人： NGK SPARK PLUG CO., LTD.

    发明人： Tomonori Niwa ,  Tetsuji Yogo

    IPC分类号： C04B035/584

    CPC分类号： C04B35/584 ,  F16C33/32

    摘要： A silicon nitride sintered body, e.g., a ball, exhibiting excellent machinability is disclosed, having an X-ray diffraction profile measured on a cross section of the silicon nitride sintered body by means of a diffractometer such that Xnull/(XnullnullXnull) is 0.9null1, wherein Xnull is the highest peak intensity associated with a silicon nitride phase and Xnull is the highest peak intensity associated with null silicon nitride phase, and silicon nitride grains of said body have an average grain size dav of 0.5-5.0 nullm and a grain aspect ratio null of 1-5, and are present in an average number of not less than 2null104 per square millimeter in a predominant crystalline phase observed on the cross section.

    摘要翻译： 公开了具有优良机械加工性的氮化硅烧结体，例如球，其具有通过衍射仪在氮化硅烧结体的横截面上测量的X射线衍射曲线，使得Xbeta /（Xalpha + Xbeta）为 0.9-1，其中Xalpha是与氮化硅相相关的最高峰强度，Xbeta是与β氮化硅相相关的最高峰强度，并且所述体的氮化硅颗粒的平均晶粒尺寸dav为0.5-5.0μm， 晶粒长宽比α为1-5，并且在横截面上观察到的主要结晶相中以平均毫微米平均数存在不小于2×10 4。

    Ceramic ball, ball bearing, motor having bearing, hard disk drive, polygon scanner, and method for manufacturing ceramic ball
    2.
    发明申请
    Ceramic ball, ball bearing, motor having bearing, hard disk drive, polygon scanner, and method for manufacturing ceramic ball 审中-公开
    陶瓷球，滚珠轴承，带有轴承的电动机，硬盘驱动器，多边形扫描器和陶瓷球的制造方法

    公开(公告)号：US20020039459A1

    公开(公告)日：2002-04-04

    申请号：US09908662

    申请日：2001-07-20

    申请人： NGK SPARK PLUG CO., LTD.

    发明人： Tomonori Niwa ,  Tetsuji Yogo

    IPC分类号： F16C033/32

    CPC分类号： F16C33/32

    摘要： A ceramic ball is described wherein no magnetic inclusion is observed on a surface of said ceramic ball, or when a magnetic inclusion is observed on the surface, dmax of the observed magnetic inclusion is not greater than 20 nullm, wherein dmax is the distance between parallel lines circumscribing the observed magnetic inclusion and whose distance is the greatest among such circumscribing parallel lines.

    摘要翻译： 描述了一种陶瓷球，其中在所述陶瓷球的表面上没有观察到磁性夹杂物，或者当在表面上观察到磁性夹杂物时，观察到的磁性夹杂物的dmax不大于20μm，其中dmax是平行 限制观察到的磁性夹杂物的线条，并且在这些外接的平行线中其距离最大。

    High-purity alumina sintered body, high-purity alumina ball, jig for semiconductor, insulator, ball bearing, check value, and method for manufacturing high-purity alumina sintered body
    3.
    发明申请
    High-purity alumina sintered body, high-purity alumina ball, jig for semiconductor, insulator, ball bearing, check value, and method for manufacturing high-purity alumina sintered body 审中-公开
    高纯度氧化铝烧结体，高纯度氧化铝球，半导体夹具，绝缘体，球轴承，检查值，以及制造高纯度氧化铝烧结体的方法

    公开(公告)号：US20010054443A1

    公开(公告)日：2001-12-27

    申请号：US09885961

    申请日：2001-06-22

    申请人： NGK SPARK PLUG CO., LTD.

    发明人： Tomonori Niwa ,  Tetsuji Yogo

    IPC分类号： F16K015/00

    CPC分类号： C04B35/111 ,  F16C33/32 ,  Y10T137/791

    摘要： A high-purity alumina sintered body having an alumina purity of not less than 99.9% by mass and a relative density of not less than 97% and exhibiting a weight loss of not greater than 100null10-null4 kg/m2 when immersed in boiling 6N H2SO4 or 6N NaOH aqueous solution for 24 hours as measured according to JIS R1614 (1993). The high-purity alumina sintered body is obtained by firing a green body formed from an alumina powder having an alumina purity of not less than 99.9% by mass and containing, as impurities, Si, an Mg, Fe and alkali metals including Na, K and Li in a total amount of less than 100 ppm.

    摘要翻译： 氧化铝纯度为99.9质量％以上且相对密度为97％以上且当浸入沸腾6N时具有不大于100×10 -4 kg / m 2的重量损失的高纯度氧化铝烧结体 H 2 SO 4或6N NaOH水溶液24小时，根据JIS R1614（1993）测量。 高纯度氧化铝烧结体是通过焙烧由氧化铝纯度为99.9质量％以上的氧化铝粉末形成的生坯，并含有作为杂质的Si，Mg，Fe和碱金属，包括Na，K 和总量小于100ppm的Li。

    High-purity alumina sintered body, high-purity alumina ball, jig for semiconductor, insulator, ball bearing, check valve, and method for manufacturing high-purity alumina sintered body
    5.
    发明申请
    High-purity alumina sintered body, high-purity alumina ball, jig for semiconductor, insulator, ball bearing, check valve, and method for manufacturing high-purity alumina sintered body 审中-公开
    高纯度氧化铝烧结体，高纯氧化铝球，半导体夹具，绝缘子，球轴承，止回阀及高纯氧化铝烧结体的制造方法

    公开(公告)号：US20030008765A1

    公开(公告)日：2003-01-09

    申请号：US10238602

    申请日：2002-09-11

    申请人： NGK SPARK PLUG CO., LTD.

    发明人： Tomonori Niwa ,  Tetsuji Yogo

    IPC分类号： C04B035/10

    CPC分类号： C04B35/111 ,  F16C33/32 ,  Y10T137/791

    摘要： A high-purity alumina sintered body having an alumina purity of not less than 99.9% by mass and a relative density of not less than 97% and exhibiting a weight loss of not greater than 100null10null4 kg/m2 when immersed in boiling 6N H2SO4 or 6N NaOH aqueous solution for 24 hours as measured according to JIS R1614 (1993). The high-purity alumina sintered body is obtained by firing a green body formed from an alumina powder having an alumina purity of not less than 99.9% by mass and containing, as impurities, Si, an Mg, Fe and alkali metals including Na, K and Li in a total amount of less than 100 ppm.

    摘要翻译： 氧化铝纯度不低于99.9质量％，相对密度不低于97％，浸渍在沸腾的6N H 2 SO 4中时，其重量损失不大于100×10 -4 kg / m 2的高纯度氧化铝烧结体 或6N NaOH水溶液24小时，根据JIS R1614（1993）测量。 高纯度氧化铝烧结体是通过焙烧由氧化铝纯度为99.9质量％以上的氧化铝粉末形成的生坯，并含有作为杂质的Si，Mg，Fe和碱金属，包括Na，K 和总量小于100ppm的Li。

    Conductive ceramic bearing ball, ball bearing, motor having bearing, hard disk drive, and polygon scanner
    6.
    发明申请
    Conductive ceramic bearing ball, ball bearing, motor having bearing, hard disk drive, and polygon scanner 有权
    导电陶瓷轴承球，球轴承，带轴承的电机，硬盘驱动器和多边形扫描仪

    公开(公告)号：US20020044705A1

    公开(公告)日：2002-04-18

    申请号：US09942990

    申请日：2001-08-31

    申请人： NGK SPARK PLUG CO., LTD.

    发明人： Tomonori Niwa ,  Tetsuji Yogo

    IPC分类号： F16C033/62 ,  F16C033/32

    CPC分类号： F16C33/32 ,  F16C2370/12 ,  G11B19/2009 ,  Y10S384/912

    摘要： A conductive ceramic bearing ball made of composite ceramic and having a mixed microstructure of a silicon nitride phase and a titanium nitride phase. The content ratio of the silicon nitride phase to the titanium nitride phase is such that the conductive ceramic bearing ball has an average coefficient of linear expansion within a temperature range of 20null C.-100null C. of from 2null10null6/K to 5null10null6/K.

    摘要翻译： 一种由复合陶瓷制成并具有氮化硅相和氮化钛相的混合微结构的导电陶瓷轴承球。 氮化硅相与氮化钛相的含有率使得导电陶瓷轴承球在20℃-100℃的温度范围内具有从2×10 -6 / K至 5x10-6 / K。