公开(公告)号：US5173458A

公开(公告)日：1992-12-22

申请号：US810723

申请日：1991-12-18

申请人： Takao Nishioka ,  Kenji Matsunuma ,  Koichi Sogabe ,  Tomoyuki Awatsu ,  Masaya Miyake ,  Takehisa Yamamoto ,  Akira Yamakawa

发明人： Takao Nishioka ,  Kenji Matsunuma ,  Koichi Sogabe ,  Tomoyuki Awatsu ,  Masaya Miyake ,  Takehisa Yamamoto ,  Akira Yamakawa

IPC分类号： C04B35/593

CPC分类号： C04B35/5935

摘要： Disclosed is a silicon nitride sintered body produced by subjecting a green compact of a mixed powder composed of 1) a silicon nitride powder having a percentage .alpha. crystallization of 93% or more and a mean grain diameter of 0.7 .mu.m or less and 2) 5 to 15% by weight in total of a first sintering aid selected from among rare earth element, yttrium oxide and lanthanide oxides and a second sintering aid consisting of aluminum oxide or nitride and at least one selected from among oxides and nitrides of Mg, Ca and Li, to primary sintering in a nitrogen gas atmosphere under a pressure of 1.1 atm or less at 1500.degree. to 1700.degree. C.; and subjecting the sintered body to secondary sintering in a nitrogen gas atmosphere under a pressure of 10 atm or more at the primary sintering temperature or below, thereby giving a sintered body wherein the relative density of the sintered body is 99% or more and the precipitation ratio of an .alpha.-Si.sub.3 N.sub.4 (including .beta.'-sialon) crystal phase ranges from 1:3 to 1:8 in terms of the peak intensity ratio in X-ray diffraction.

公开(公告)号：US5275772A

公开(公告)日：1994-01-04

申请号：US957506

申请日：1992-10-05

申请人： Takehisa Yamamoto ,  Takao Nishioka ,  Kenji Matsunuma ,  Akira Yamakawa ,  Masaya Miyake

发明人： Takehisa Yamamoto ,  Takao Nishioka ,  Kenji Matsunuma ,  Akira Yamakawa ,  Masaya Miyake

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

CPC分类号： C04B35/5935 ,  C04B35/597

摘要： The present invention relates to a silicon nitride sintered body [wherein the composition of Si.sub.3 N.sub.4 -first aid (Y.sub.2 O.sub.3 +MgO)-second aid (at least one of Al.sub.2 O.sub.3 and AlN)] falls within a range defined by lines joining points A, B, C and D in FIG. 1, the crystal phase of the sintered body contains both .alpha.-Si.sub.3 N.sub.4 and .beta.'-sialon, and the relative density is 98% or more. This sintered body is produced by subjecting a green compact of the above-described source to primary sintering in a nitrogen gas atmosphere at 1300 to 1700.degree. C. so that the relative density reaches 96% or more, and the precipitation ratio of the .alpha.-Si.sub.3 N.sub.4 crystal phases to the .beta.'-sialon crystal phase in the sintered body is in the range of from 40:60 to 80:20; and then subjecting the primary sintered body to secondary sintering in a nitrogen gas atmosphere at 1300 to 1700.degree. C. so that the relative density reaches 98% or more. The sintered body has superior strength properties, especially at ordinary temperatures, and can be produced with a high productivity in a high yield at a low cost.

摘要翻译： 本发明涉及一种氮化硅烧结体[其中，Si 3 N 4 - 急救（Y 2 O 3 + MgO） - 辅助剂（Al 2 O 3和AlN中的至少一种）的组成]落在由连接点A，B， C和D。 如图1所示，烧结体的结晶相含有α-Si 3 N 4和β'-Sialon，相对密度为98％以上。 该烧结体是通过使上述源的生坯在1300〜1700℃的氮气气氛中进行一次烧结而制成的，使得相对密度达到96％以上， Si3N4晶相与烧结体中的β' - 赛隆结晶相的比例范围为40:60至80:20; 然后在1300〜1700℃的氮气气氛中使一次烧结体进行二次烧结，使得相对密度达到98％以上。 该烧结体具有优异的强度特性，特别是在普通温度下，可以低成本高产率地以高生产率生产。

公开(公告)号：US5204297A

公开(公告)日：1993-04-20

申请号：US825989

申请日：1992-01-27

申请人： Takehisa Yamamoto ,  Takao Nishioka ,  Kenji Matsunuma ,  Akira Yamakawa ,  Masaya Miyake

发明人： Takehisa Yamamoto ,  Takao Nishioka ,  Kenji Matsunuma ,  Akira Yamakawa ,  Masaya Miyake

IPC分类号： C04B35/593 ,  C04B35/597

CPC分类号： C04B35/5935 ,  C04B35/597

摘要： The present invention relates to a silicon nitride sintered body [wherein the composition of Si.sub.3 N.sub.4 -first aid (Y.sub.2 O.sub.3 +MgO)-second aid (at least one of Al.sub.2 O.sub.3 and AlN)] falls within a range defined by lines joining points A, B, C and D in FIG. 1, the crystal phase of the sintered body contains both .alpha.-Si.sub.3 N.sub.4 and .beta.'-sialon, and the relative density is 98% or more. This sintered body is produced by subjecting a green compact of the above-described source to primary sintering in a nitrogen gas atmosphere at 1300.degree. to 1700.degree. C. so that the relative density reaches 96% or more, and the precipitation ratio of the .alpha.-Si.sub.3 N.sub.4 crystal phases to the .beta.'-sialon crystal phase in the sintered body is in the range of from 40:60 to 80:20; and then subjecting the primary sintered body to secondary sintering in a nitrogen gas atmosphere at 1300.degree. to 1700.degree. C. so that the relative density reaches 98% or more. The sintered body has superior strength properties, especially at ordinary temperatures, and can be produced with a high productivity in a high yield at a low cost.

公开(公告)号：US5346869A

公开(公告)日：1994-09-13

申请号：US175490

申请日：1993-12-29

申请人： Takao Nishioka ,  Takehisa Yamamoto ,  Kenji Matsunuma ,  Akira Yamakawa ,  Masaya Miyake

发明人： Takao Nishioka ,  Takehisa Yamamoto ,  Kenji Matsunuma ,  Akira Yamakawa ,  Masaya Miyake

IPC分类号： C04B35/584 ,  C04B35/593 ,  C04B35/597 ,  F01L1/20 ,  F02B3/06 ,  F02F7/00 ,  C04B35/58

CPC分类号： C04B35/584 ,  C04B35/5935 ,  C04B35/597 ,  F01L1/205 ,  F02F7/0087 ,  F02B3/06 ,  F05C2203/0895

摘要： Described are sintered silicon nitride bodies useful as materials for parts required to have strength, especially excellent impact strength for items such as automobile parts and machine parts. The sintered Si.sub.3 N.sub.4 bodies contain 80-98 wt. % of silicon nitride and have a porosity not higher than 3% and an shock compressive elasticity limit of at least 15 GPa.

摘要翻译： 描述了可用作对于诸如汽车部件和机器部件的物品具有强度，特别优异的冲击强度的部件的材料的烧结氮化硅体。 烧结的Si 3 N 4体含有80-98wt。 ％的氮化硅，并且具有不高于3％的孔隙率和至少15GPa的冲击压缩弹性极限值。

公开(公告)号：US5234642A

公开(公告)日：1993-08-10

申请号：US459398

申请日：1989-12-29

申请人： Takao Nishioka ,  Akira Kuibira ,  Kenji Matsunuma ,  Yoshishige Takano ,  Matsuo Higuchi ,  Masaaki Honda ,  Masaya Miyake

发明人： Takao Nishioka ,  Akira Kuibira ,  Kenji Matsunuma ,  Yoshishige Takano ,  Matsuo Higuchi ,  Masaaki Honda ,  Masaya Miyake

IPC分类号： C04B35/597

CPC分类号： C04B35/597

摘要： A high-strength silicon nitride sintered body having a flexural strength of 100 kg/mm.sup.2 or higher and a process for producing the same are disclosed, the sintered body comprising not less than 90% by weight of a single crystalline phase of silicon aluminum oxynitride (Si.sub.6-z Al.sub.2 O.sub.z N.sub.8-z, wherein z is a number of from 0 to 4.2) having an average longer diameter of not more than 5 .mu.m and an aspect ratio of not less than 5, the crystal phase constituting a network structure in the sintered body, the balance being a crystalline or amorphous (glassy) phase comprising one or more of oxides or oxynitrides of a rare earth metal, a group 3A metal, a group 2A metal or Si, and the process comprising mixing silicon nitride powder, an organic metal salt as a first sintering aid, and at least one of a metal oxide, a metal nitride, and a metal oxynitride as a second sintering aid, either separately or as a mixture of two or more thereof, with a solvent and a surface active agent, subjecting the mixture or mixtures to ultrasonic dispersion, mixing the mixtures together followed by drying to obtain a mixed powder, molding the mixed powder, and sintering the molded article at a temperature of from 1,600.degree. to 2,200.degree. C. in a non-oxidative atmosphere.

公开(公告)号：US5225127A

公开(公告)日：1993-07-06

申请号：US829571

申请日：1992-02-03

申请人： Takao Nishioka ,  Yoshishige Takano ,  Kenji Matsunuma ,  Matsuo Higuchi ,  Masaya Miyake

发明人： Takao Nishioka ,  Yoshishige Takano ,  Kenji Matsunuma ,  Matsuo Higuchi ,  Masaya Miyake

IPC分类号： C04B35/593

CPC分类号： C04B35/5935

摘要： There is provided a process for the production of a sintered article which comprises steps ofshaping a raw material powder comprising silicon nitride,thermally treating a shaped article in a non-oxidizing atmosphere at a temperature of 1300.degree. to 1650.degree. C. for at least 2 hours to form .beta.-silicon nitride of not less than 85% calculated from X-ray diffraction patterns and to increase a relative density of the article to not less than 80%, preferably to 80 to 85 %, andsintering the thermally treated article at a temperature of 1700.degree. to 2000.degree. C.

摘要翻译： 提供了一种生产烧结制品的方法，该方法包括以下步骤：使含有氮化硅的原料粉末成形，在1300℃至1650℃的温度下在非氧化性气氛中对成形制品进行热处理，至少 2小时以形成由X射线衍射图计算的不小于85％的β-氮化硅，并将制品的相对密度提高至不小于80％，优选至80至85％，并将热处理物品 在1700〜2000℃的温度下

公开(公告)号：US5328876A

公开(公告)日：1994-07-12

申请号：US995703

申请日：1992-12-23

申请人： Takao Nishioka ,  Akira Kuibira ,  Kenji Matsunuma ,  Yoshishige Takano ,  Matsuo Higuchi ,  Masaaki Honda ,  Masaya Miyake

发明人： Takao Nishioka ,  Akira Kuibira ,  Kenji Matsunuma ,  Yoshishige Takano ,  Matsuo Higuchi ,  Masaaki Honda ,  Masaya Miyake

IPC分类号： C04B35/597 ,  C04B35/58

CPC分类号： C04B35/597

摘要： A high-strength silicon nitride sintered body having a flexural strength of 100 kg/mm.sup.2 or higher and a process for producing the same are disclosed, the sintered body comprising not less than 90% by weight of a single crystalline phase of silicon aluminum oxynitride (Si.sub.6-z Al.sub.2 O.sub.z N.sub.8-z, wherein z is a number of from 0 to 4.2) having an average longer diameter of not more than 5 .mu.m and an aspect ratio of not less than 5, the crystal phase constituting a network structure in the sintered body, the balance being a crystalline or amorphous (glassy) phase comprising one or more of oxides or oxynitrides of a rare earth metal, a group 3A metal, a group 2A metal or Si, and the process comprising mixing silicon nitride powder, an organic metal salt as a first sintering aid, and at least one of a metal oxide, a metal nitride, and a metal oxynitride as a second sintering aid, either separately or as a mixture of two or more thereof, with a solvent and a surface active agent, subjecting the mixture or mixtures to ultrasonic dispersion, mixing the mixtures together followed by drying to obtain a mixed powder, molding the mixed powder, and sintering the molded article at a temperature of from 1,600.degree. C. to 2,200.degree. C. in a non-oxidative atmosphere.

摘要翻译： 公开了一种弯曲强度为100kg / mm 2以上的高强度氮化硅烧结体及其制造方法，所述烧结体包含不小于90重量％的氮化硅铝的单晶相（ Si6-zAl2OzN8-z，其中z为0-4.2的数），平均长度不大于5μm，纵横比不小于5，构成烧结体网状结构的晶相 余量为包含稀土金属，3A族金属，2A族金属或Si族的氧化物或氮氧化物中的一种或多种的结晶或无定形（玻璃质）相，并且该方法包括将氮化硅粉末，有机金属 盐作为第一烧结助剂，以及作为第二烧结助剂的金属氧化物，金属氮化物和金属氮氧化物中的至少一种，分别地或作为其两种或多种的混合物与溶剂和表面活性剂 对混合物进行处理 或与超声分散体的混合物，将混合物混合在一起，然后干燥以获得混合粉末，模塑混合粉末，并在非氧化性气氛中在1600℃至2200℃的温度下烧结该模制品。

公开(公告)号：US5280208A

公开(公告)日：1994-01-18

申请号：US925937

申请日：1992-08-05

申请人： Osamu Komura ,  Kenji Matsunuma ,  Norio Yasuoka ,  Matsuo Higuchi ,  Masaya Miyake ,  Tetsuya Katayama ,  Akira Yamakawa

发明人： Osamu Komura ,  Kenji Matsunuma ,  Norio Yasuoka ,  Matsuo Higuchi ,  Masaya Miyake ,  Tetsuya Katayama ,  Akira Yamakawa

IPC分类号： F16C33/04 ,  F16C33/10 ,  F16C39/06 ,  H02K7/08 ,  F16C32/06 ,  H02K7/09

CPC分类号： F16C39/063 ,  F16C17/026 ,  F16C17/045 ,  F16C17/107 ,  F16C32/0402 ,  F16C32/0427 ,  F16C32/0431 ,  F16C33/043 ,  F16C33/107

摘要： A composite bearing structure can withstand high speed rotation has first, second and third bearing components. The first bearing component supports a radial impact force applied to a rotator during rotation, and is made of an inner ring (1) and an outer ring (2) of silicon nitride ceramic sintered bodies. The second bearing component supports an axial load applied to the rotator while maintaining a required clearance between itself and the rotator and is made of two permanent magnets (12, 13) positioned thrustdirectionally opposite to each other. The third bearing component maintains a radial rotational accuracy of the rotator, and is made of a radial dynamic pressure producing groove (5) provided on a cylindrical surface of the inner ring (1).

摘要翻译： 复合轴承结构可承受高速旋转，具有第一，第二和第三轴承部件。 第一轴承部件支承在转动期间施加到旋转体的径向冲击力，并由氮化硅陶瓷烧结体的内圈（1）和外圈（2）制成。 第二轴承部件支撑施加到旋转器的轴向载荷，同时在其自身和旋转体之间保持所需的间隙，并且由两个彼此相反方向相对定位的永磁体（12,13）制成。 第三轴承部件保持旋转体的径向旋转精度，并且由设置在内圈（1）的圆柱形表面上的径向动压产生槽（5）制成。

公开(公告)号：US5776600A

公开(公告)日：1998-07-07

申请号：US631666

申请日：1996-04-09

申请人： Tetsuya Katayama ,  Kaoru Murabe ,  Osamu Komura ,  Chihiro Kawai ,  Akira Yamakawa ,  Kenji Matsunuma ,  Norio Yasuoka ,  Matsuo Higuchi ,  Masaya Miyake

发明人： Tetsuya Katayama ,  Kaoru Murabe ,  Osamu Komura ,  Chihiro Kawai ,  Akira Yamakawa ,  Kenji Matsunuma ,  Norio Yasuoka ,  Matsuo Higuchi ,  Masaya Miyake

IPC分类号： C04B35/01 ,  C04B35/584 ,  C04B35/593 ,  C04B41/00 ,  C04B41/80 ,  F16C33/04 ,  F16C33/16 ,  C04B35/587

CPC分类号： C04B41/009 ,  C04B35/01 ,  C04B35/584 ,  C04B35/593 ,  C04B35/5935 ,  C04B41/0072 ,  C04B41/80 ,  F16C33/043 ,  F16C33/16 ,  C04B2111/00353 ,  Y10T428/252 ,  Y10T428/2991 ,  Y10T428/30

摘要： A slide member has a sliding surface made of ceramic and a has surface roughness of not more than 1.0 .mu.m in center line average roughness Ra. The ceramics includes a silicon nitride sintered body which contains crystal grains having a linear density of at least 35 per 30 .mu.m in length with a boundary phase volume ratio of not more than 15 volume %, and which contains pores of not more than 20 .mu.m in maximum diameter in a content of not more than 3%. In a method of manufacturing the slide member, it is possible to ensure smoothness of the sliding surface by grinding the sliding surface and thereafter heating the ceramic in an either an inert gas or atmospheric air. A slide member that can be used under severe sliding conditions of high-speed sliding or the like and that has excellent wear resistance is obtained. Even if the slide member is used for to a sliding part of a compressor or the like which employs a fluorocarbon containing no chlorine as a cooling medium, it is possible to prevent the occurrence of seizure and abnormal wear on the sliding surface.

摘要翻译： 滑动构件具有由陶瓷制成的滑动面，并且在中心线平均粗糙度Ra中具有不大于1.0μm的表面粗糙度。 陶瓷包括氮化硅烧结体，其包含长度为30μm以上的线密度为35以上，边界相体积比为15体积％以下且含有不大于20μm的孔的晶粒 m最大直径，含量不超过3％。 在制造滑动构件的方法中，可以通过研磨滑动表面并随后在惰性气体或大气中加热陶瓷来确保滑动表面的平滑度。 可以获得可以在高速滑动等的严酷滑动条件下使用且具有优异的耐磨性的滑动构件。 即使将滑动部件用于使用不含氯的氟碳化合物的压缩机等的滑动部作为冷却介质，也可以防止滑动面发生卡滞和异常磨损。

公开(公告)号：US5675201A

公开(公告)日：1997-10-07

申请号：US295623

申请日：1994-08-24

申请人： Osamu Komura ,  Tetsuya Katayama ,  Akira Yamakawa ,  Kenji Matsunuma ,  Norio Yasuoka ,  Matsuo Higuchi ,  Masaya Miyake

发明人： Osamu Komura ,  Tetsuya Katayama ,  Akira Yamakawa ,  Kenji Matsunuma ,  Norio Yasuoka ,  Matsuo Higuchi ,  Masaya Miyake

IPC分类号： F16C17/02 ,  F16C32/00 ,  F16C32/04 ,  F16C33/10 ,  F16C33/24 ,  F16C39/06 ,  H02K7/08 ,  H02K7/09

CPC分类号： F16C32/0427 ,  F16C17/107 ,  F16C32/0431 ,  F16C33/107 ,  F16C39/063

摘要： A composite bearing structure that has a high rotational accuracy and that can withstand high-speed rotation comprises first bearing means, second bearing means, third bearing means and fourth bearing means. The first bearing means supports a radial impact force which is applied to a rotator during rotation, and is formed by an inner ring (1) and an outer ring (2) consisting of silicon nitride ceramics sintered bodies. The second bearing means supports an axial load which is applied to the rotator while maintaining a prescribed clearance with the rotator, and is formed by a magnetic bearing body of two permanent magnets (12) and (13) which are thrust-directionally opposed to each other. The third bearing means maintains the radial rotational accuracy of the rotator, and is formed by a radial dynamic pressure producing groove (5) which is formed in a cylindrical surface of the inner ring (1). The fourth bearing means maintains the thrust-directional rotational accuracy of the rotator, and is formed by an air dome portion (100) which is confined in a semi-closed state by the inner ring (1), the outer ring (2) and a cover (4).

摘要翻译： PCT No.PCT / JP94 / 00002 Sec。 371日期：1994年8月24日 102（e）日期1994年8月24日PCT 1994年1月4日PCT PCT。 公开号WO94 / 16233 PCT 日期1994年7月21日具有高旋转精度并能承受高速旋转的复合轴承结构包括第一轴承装置，第二轴承装置，第三轴承装置和第四轴承装置。 第一轴承装置支撑在旋转期间施加到旋转器的径向冲击力，并且由内环（1）和由氮化硅陶瓷烧结体组成的外圈（2）形成。 第二轴承装置支撑轴向载荷，该轴向载荷与旋转体保持规定的间隙，并且由两个永磁体（12）和（13）的磁轴承体形成，该永磁体与每个 其他。 第三轴承装置维持旋转体的径向旋转精度，并且由形成在内圈（1）的圆柱形表面中的径向动压产生槽（5）形成。 第四轴承装置保持旋转体的推力定向旋转精度，并且由内圈（1），外圈（2）和外圈（1）限定在半闭合状态的空气圆顶部（100）形成， 盖（4）。