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    Method of molding silicon nitride ceramics
    1.
    发明授权
    Method of molding silicon nitride ceramics 失效
    氮化硅陶瓷成型方法

    公开(公告)号：US5385701A

    公开(公告)日：1995-01-31

    申请号：US919590

    申请日：1992-07-24

    申请人： Tomoyuki Awazu ,  Yasushi Tsuzuki ,  Osamu Komura ,  Akira Yamakawa

    发明人： Tomoyuki Awazu ,  Yasushi Tsuzuki ,  Osamu Komura ,  Akira Yamakawa

    IPC分类号： B28B1/08 ,  B28B1/26 ,  C04B35/584 ,  C04B35/622 ,  C04B33/28 ,  C04B33/58

    CPC分类号： B28B1/26 ,  C04B35/584 ,  C04B35/622

    摘要： Disclosed herein are a method for molding a high density and homogeneous silicon nitride ceramics within a short time and an apparatus used for the method. A gel-like slurry mixture which is a mixture of ceramic powders consisting mainly of Si.sub.3 N.sub.4 and a liquid and has a powder content of from 45 vol % to 60 vol % is fluidized by imparting thereto a strain by vibration, and the mixture under the fluidized state is filled into, and molded by, a mold. Preferably, the entire part or a part of the mold is made of a liquid permeable material. The vibration preferably has an acceleration of from 0.1 G to 150 G and an amplitude of 1 .mu.m to 1 cm. Furthermore, the viscosity of the slurry filled into the mold is preferably from 2,000 to 20,000 cps.

    摘要翻译： 本文公开了一种用于在短时间内模制高密度均匀氮化硅陶瓷的方法和用于该方法的装置。 作为主要由Si 3 N 4和液体组成的粉末含量为45体积％至60体积％的陶瓷粉末的混合物的凝胶状浆料混合物通过振动赋予其应变而流化，并且流化床 状态被模具填充并模制。 优选地，模具的整个部分或一部分由液体可渗透的材料制成。 振动优选具有0.1G至150G的加速度和1μm至1cm的振幅。 此外，填充到模具中的浆料的粘度优选为2,000至20,000cps。

    Silicon nitride powder and its manufacturing
    2.
    发明授权
    Silicon nitride powder and its manufacturing 失效
    氮化硅粉末及其制造

    公开(公告)号：US5538927A

    公开(公告)日：1996-07-23

    申请号：US403122

    申请日：1995-03-13

    申请人： Yasushi Tsuzuki ,  Tomoyuki Awazu ,  Akira Yamakawa

    发明人： Yasushi Tsuzuki ,  Tomoyuki Awazu ,  Akira Yamakawa

    IPC分类号： C01B21/068 ,  C04B35/593 ,  C04B35/584

    CPC分类号： C04B35/5935 ,  C01B21/0687 ,  C01P2004/32 ,  C01P2004/61 ,  C01P2006/12 ,  C01P2006/22

    摘要： A silicon nitride powder with which a highly reliable silicon nitride with high strength and small strength and dimensional variances is obtainable is disclosed. By setting the amount of their surface acidic groups per B.E.T. surface area to not less than 0.2 .mu.eq/m.sup.2, their dispersibility in a mixing solvent is drastically improved. By using them, moldings with high density and homogeneity can be obtained, thereby enabling in turn a highly reliable sintered product of silicon nitride with high strength and small strength and dimensional variances to be easily manufactured. Besides, in the silicon nitride powder, the proportion of the silicon [Si*] belonging to SiO.sub.2, of the surface silicon [Si], which is determined by the X-ray photoelectron spectroscopy (XPS), should be not less than 0.07 in its atomic ratio [Si*/Si] and that to silicon of the surface carbon [C] which is determined by XPS in the same way should be not more than 0.20 in its atomic ratio [C/Si].

    摘要翻译： 公开了一种可获得具有高强度和小的强度和尺寸变化的高度可靠的氮化硅的氮化硅粉末。 通过设定每个B.E.T.的表面酸性基团的量。 表面积不小于0.2μeq / m2，其在混合溶剂中的分散性显着提高。 通过使用它们，可以获得高密度和均匀的模制品，从而可以容易地制造高可靠性，高强度和小的强度和尺寸变化的高可靠性的氮化硅烧结产品。 此外，在氮化硅粉末中，由X射线光电子能谱（XPS）确定的表面硅[Si]的属于SiO 2的硅[Si *]的比例应不小于0.07 其原子比[Si * / Si]和表面碳[C]的硅以相同的方式由XPS确定，其原子比[C / Si]应不大于0.20。

    Process for molding ceramics
    3.
    发明授权
    Process for molding ceramics 失效
    陶瓷成型工艺

    公开(公告)号：US06458298B1

    公开(公告)日：2002-10-01

    申请号：US08505069

    申请日：1995-07-21

    申请人： Tomoyuki Awazu ,  Yasushi Tsuzuki ,  Akira Yamakawa

    发明人： Tomoyuki Awazu ,  Yasushi Tsuzuki ,  Akira Yamakawa

    IPC分类号： B28B126

    CPC分类号： B28B1/262 ,  B28B1/265 ,  B29C2043/3628 ,  B29L2023/00

    摘要： A wet molding method in which a ceramic slurry is charged into a cavity and uniaxially pressed by a punch to remove excess liquid from a portion of the slurry facing the punch to effect molding, the method being improved by maintaining at least one of the following conditions; (a) the pressing of the slurry is stopped at a time between T and 1.5 T, T being defined as the pressing time necessary to remove sufficient excess liquid from the slurry in the mold to produce a molded mass; or (b) the punch displacement position at a time at which sufficient excess liquid is removed from the slurry in the mold to produce a molded mass is less than 17% of the total mold length.

    摘要翻译： 一种湿法成型方法，其中将陶瓷浆料装入空腔中并通过冲头单轴挤压以从面向冲头的浆料的一部分中除去多余的液体以实现模塑，该方法通过保持以下条件中的至少一种而得到改善 （a）在T和1.5T之间停止浆料的压制，T定义为从模具中的浆料中除去足够多的液体以产生模制物料所需的挤压时间; 或（b）在模具中从浆料中除去足够多的液体以产生模制物料的时间处的冲头位移位置小于总模具长度的17％。

    Method of producing sintered silicon nitrides
    4.
    发明授权
    Method of producing sintered silicon nitrides 失效
    制造烧结硅氮化物的方法

    公开(公告)号：US5394015A

    公开(公告)日：1995-02-28

    申请号：US91192

    申请日：1993-07-14

    申请人： Yasushi Tsuzuki ,  Tomoyuki Awazu ,  Akira Yamakawa

    发明人： Yasushi Tsuzuki ,  Tomoyuki Awazu ,  Akira Yamakawa

    IPC分类号： C04B35/584 ,  C04B35/593 ,  F01L1/04 ,  F01L3/02 ,  F02F5/00 ,  F16J9/26 ,  C04B35/58

    CPC分类号： C04B35/584 ,  C04B35/5935 ,  C04B35/6263 ,  C04B2235/3206 ,  C04B2235/3217 ,  C04B2235/3222 ,  C04B2235/3225 ,  C04B2235/3865 ,  C04B2235/3878 ,  C04B2235/5445 ,  C04B2235/6022 ,  C04B2235/604 ,  C04B2235/6567 ,  C04B2235/658 ,  C04B2235/661 ,  C04B2235/77 ,  C04B2235/96

    摘要： The invention provides a method of producing sintered silicon nitrides having such strength characteristics as are sufficient to insure satisfactory reliability of the sintered silicon nitride for use in applications such as automotive engine parts and bearings. The method comprises preparing a sintering aid by blending yttrium oxide, spinel, and aluminum oxide and/or aluminum nitride together in such proportions in terms of molar ratios of metal elements that Y/(Al+Mg) is 0.23 to 0.85 and Al/Mg is 2.1 to 5.2, mixing 5.0 to 13.0% by weight of the sintering aid with 87.0 to 95.0% by weight of a silicon nitride powder having an .alpha. crystallinity of not less than 60%, and, after the resulting powder mixture is molded into shape, sintering the molded piece at temperatures of 1400 to 1650.degree. C. in a nitrogen gas atmosphere or in an inert gas atmosphere containing nitrogen gas.

    摘要翻译： 本发明提供了一种制造烧结硅氮化物的方法，其具有足以确保用于汽车发动机部件和轴承的应用中的氮化硅烧结体的令人满意的可靠性的强度特性。 该方法包括通过以Y /（Al + Mg）为0.23至0.85的金属元素的摩尔比和Al / Mg的摩尔比将氧化钇，尖晶石和氧化铝和/或氮化铝以这样的比例混合来制备烧结助剂 为2.1〜5.2，将5.0〜13.0重量％的烧结助剂与87.0〜95.0重量％的α结晶度为60％以上的氮化硅粉末混合，在得到的粉末混合物成型后 ，在氮气气氛中或在含有氮气的惰性气体气氛中，在1400〜1650℃的温度下烧结成型体。

    Hydrodynamic gas bearing structure and optical deflection scanner comprising the same
    5.
    发明授权
    Hydrodynamic gas bearing structure and optical deflection scanner comprising the same 有权
    流体动力气体轴承结构和包括其的光学偏转扫描仪

    公开(公告)号：US6123460A

    公开(公告)日：2000-09-26

    申请号：US171999

    申请日：1998-10-28

    申请人： Hisao Takeuchi ,  Kaoru Murabe ,  Osamu Komura ,  Tomoyuki Awazu

    发明人： Hisao Takeuchi ,  Kaoru Murabe ,  Osamu Komura ,  Tomoyuki Awazu

    IPC分类号： F16C15/00 ,  F16C33/04 ,  F16C33/10 ,  F16C33/14 ,  G02B26/12 ,  F16C32/06

    CPC分类号： G02B26/121 ,  F16C17/028 ,  F16C17/18 ,  F16C33/043 ,  F16C33/1075 ,  F16C33/14 ,  F16C3/02

    摘要： A hydrodynamic gas bearing structure can prevent the occurrence of whirl not only in high-speed rotation but also in low-speed rotation, and is capable of suppressing dispersion of a floating rotational frequency. The hydrodynamic gas bearing structure includes a shaft body (1) and a bearing body (2). A groove (11) is formed on the outer peripheral surface of the shaft body (1). The groove (11) consists of at least two concave parts, of which the depths substantially differ from each other, which are formed serially in the circumferential direction, and which each have a circumferentially asymmetrical shape in a cross section perpendicular to the axis. A circumferential distance a is defined between the intersection point (15) of the outer circular peripheral line (Q) of the shaft body and a line (C) connecting the deepest point (14) of the groove (11) with the center (O) of the shaft body (1), and one edge (16) of the groove (11) positioned downstream with respect to an air current (P) generated during rotation in relation to the intersection point (15). This circumferential distance a is larger than the circumferential distance b between the intersection point (15) and the other edge (17) of the groove (11) positioned upstream with respect to the air current (P) in relation to the intersection point (15). The hydrodynamic gas bearing structure is employed for a rotation driving part of an optical deflection scanner.

    摘要翻译： PCT No.PCT / JP98 / 00740 Sec。 371 1998年10月28日第 102（e）1998年10月28日PCT PCT日期：1998年2月23日PCT公布。 第WO98 / 38434号公报 日期1998年9月3日流体动力气体轴承结构不仅可以防止在高速旋转中而且在低速旋转中产生旋转，并且能够抑制浮动旋转频率的分散。 流体动力气体轴承结构包括轴体（1）和轴承体（2）。 在轴体（1）的外周面形成有槽（11）。 凹槽（11）由至少两个凹部构成，其深度基本上彼此不同，它们在圆周方向上串联形成，并且在与轴线垂直的横截面中各具有周向不对称的形状。 圆周距离a限定在轴体的外圆周线（Q）的交点（15）与将槽（11）的最深点（14）与中心（O）连接的线（C）之间 ）和相对于相对于交点（15）旋转期间产生的气流（P））位于下游的凹槽（11）的一个边缘（16）。 该圆周距离a大于相对于交点（15）位于相对于气流（P）的上游的槽（11）的交点（15）和另一边缘（17）之间的圆周距离b ）。 流体动力气体轴承结构用于光学偏转扫描器的旋转驱动部分。

    Dynamic pressure pneumatic bearing structure and method of manufacturing the same
    6.
    发明授权
    Dynamic pressure pneumatic bearing structure and method of manufacturing the same 有权

    公开(公告)号：US6082900A

    公开(公告)日：2000-07-04

    申请号：US172000

    申请日：1998-10-28

    申请人： Hisao Takeuchi ,  Kaoru Murabe ,  Osamu Komura ,  Tomoyuki Awazu

    发明人： Hisao Takeuchi ,  Kaoru Murabe ,  Osamu Komura ,  Tomoyuki Awazu

    IPC分类号： F16C15/00 ,  F16C33/04 ,  F16C33/10 ,  F16C33/14 ,  G02B26/12 ,  F16C17/02

    CPC分类号： G02B26/121 ,  F16C17/028 ,  F16C17/18 ,  F16C33/043 ,  F16C33/1075 ,  F16C33/14 ,  F16C3/02

    摘要： Provided is a hydrodynamic gas bearing structure which can prevent occurrence of whirl not only in high-speed rotation but also in low-speed rotation, reduces such frequency that a floating rotational frequency in starting or stoppage of rotation increases, and is capable of shifting the floating rotational frequency to a low rotational frequency side. The hydrodynamic gas bearing structure comprises a shaft body (1) and a bearing body (2). A groove (11) is formed on the outer peripheral surface of the shaft body (1). The groove (11) consists of at least two concave parts, whose depths substantially differ from each other, which are formed serially in the circumferential direction, and has a circumferentially asymmetrical shape in a cross section perpendicular to the axis. The circumferential distance a between the intersection point (15) of a line (C) connecting the deepest point (14) of the groove (11) and the center (O) of the shaft body (1) and the outer peripheral line (Q) of the shaft body (1) and one edge (16) of the groove (11) positioned downward an air current (P) generated in rotation in relation to the intersection point (15) is larger than the circumferential distance b between the intersection point (15) and the other edge (17) of the groove (11) positioned upstream the air current (P) in relation to the intersection point (15). The ratio (d.sub.2 /d.sub.1) of the mean depth d.sub.2 of a relatively shallow part of the groove (11) to the mean depth d.sub.1 of a relatively deep part of the groove (11) is less than 0.3. The hydrodynamic gas bearing structure is suitable for employment for a rotation driving part of a magnetic recording apparatus or a laser beam printer.

    Silicon nitride sintered body
    7.
    发明授权
    Silicon nitride sintered body 失效
    氮化硅烧结体

    公开(公告)号：US5275986A

    公开(公告)日：1994-01-04

    申请号：US941659

    申请日：1992-09-08

    申请人： Takehisa Yamamoto ,  Takao Nishioka ,  Tomoyuki Awazu ,  Akira Yamakawa

    发明人： Takehisa Yamamoto ,  Takao Nishioka ,  Tomoyuki Awazu ,  Akira Yamakawa

    IPC分类号： C04B35/584 ,  C04B35/593 ,  C04B35/597 ,  C04B35/58

    CPC分类号： C04B35/5935 ,  C04B35/597

    摘要： A silicon nitride sintered body comprising .alpha.-silicon nitride including .alpha.'-sialon and .beta.'-sialon including .beta.-silicon nitride in which the content of the .alpha.-silicon nitride including .alpha.'-sialon in the surface part thereof is less than its content in the inner part thereof. The silicon nitride sintered body is excellent in mechanical strength at ordinary temperature, productivity and cost efficiency.

    摘要翻译： 包括（α） - 硅氮化物的氮化硅烧结体，其包含（α） - 赛隆和（β）' - 赛隆，包括（β） - 氮化硅，其中（α） - 硅氮化物的含量包括（α） 其表面部分中的赛隆细胞的含量小于其内部的含量。 氮化硅烧结体在常温下的机械强度，生产率和成本效率优异。