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：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：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：US5358797A

公开(公告)日：1994-10-25

申请号：US911914

申请日：1992-07-10

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

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

IPC分类号： C04B35/584 ,  C04B35/593 ,  C04B35/597 ,  C04B35/599 ,  C04B38/00 ,  F01L1/14 ,  F01L1/16 ,  F01L1/20

CPC分类号： C04B35/593 ,  C04B35/597 ,  F01L1/143 ,  F01L1/16 ,  F01L1/205 ,  Y10T428/265

摘要： The present invention provides an improved adjusting shim used in a valve train for an internal combustion engine for an automobile. The adjusting shim produced from a base material consisting of a ceramic material containing 80 to 98 wt. % of silicon nitride and/or sialon and has a porosity of not more than 3%, a bending strength of not less than 1.0 GPa and an impact compressive elastic limit (Hugoniot elastic limit) of not less than 15 GPa, wherein the base material is provided on the surface thereof which contacts a cam with a ceramic surface layer having a composition different from that of the base material and a hardness lower than that of the base material. The adjusting shim of the present invention enables a power loss of a valve train to be minimized; the abrasion resistance thereof to be improved; and the fuel economy, the performance and durability of an internal combustion engine to be improved.

摘要翻译： 本发明提供一种用于汽车内燃机的气门机构中使用的改进的调节垫片。 由由含有80〜98重量％的陶瓷材料构成的基材制成的调整垫片 ％的氮化硅和/或赛隆，并且具有不大于3％的孔隙率，不小于1.0GPa的弯曲强度和不小于15GPa的冲击压缩弹性极限（Hugoniot弹性极限）），其中所述基材 在其表面上设置有与具有不同于基材的组成的陶瓷表面层的凸轮接触，并且硬度低于基材的硬度。 本发明的调节垫片能够使气门机构的功率损失最小化; 其耐磨性得到提高; 并且燃料经济性，内燃机的性能和耐久性得到改善。

公开(公告)号：US5502011A

公开(公告)日：1996-03-26

申请号：US303591

申请日：1994-09-09

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

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

IPC分类号： C04B35/597 ,  C04B35/587 ,  C04B35/599

CPC分类号： C04B35/597

摘要： A silicon nitride sintered body characterized by comprising crystal grains having a linear density of 60 to 120 per 50 .mu.m length as measured in an arbitrary two-dimensional section of the sintered body. The silicon nitride sintered body has a shock compressive elasticity limit (Hugoniot-elastic limit) of 15 GPa or more and is substantially composed of crystal phases of .alpha.-silicon nitride and .beta.'-sialon. The percentages of the .alpha.-silicon nitride and .beta.'-sialon are not more than 30% and not less than 70%, respectively. The silicon nitride sintered body is particularly excellent in mechanical strengths at room temperature as well as in productivity and cost efficiency and is useful for applications as the material of parts where a particularly high impact strength is required, such as a valve train mechanism for automobile parts.

摘要翻译： 一种氮化硅烧结体，其特征在于包括在烧结体的任意二维截面中测得的每50μm长度的线密度为60至120的晶粒。 氮化硅烧结体具有15GPa或更高的冲击压缩弹性极限（Hugoniot弹性极限），并且基本上由α-氮化硅和β'塞隆的结晶相组成。 α硅氮化物和β' - 赛隆的百分比分别不超过30％且不小于70％。 氮化硅烧结体在室温下的机械强度以及生产​​率和成本效率方面特别优异，作为需要特别高的冲击强度的部件的材料，例如汽车部件的气门机构 。

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：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：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。