公开(公告)号：US4533251A

公开(公告)日：1985-08-06

申请号：US158023

申请日：1980-06-09

申请人： Kenneth French ,  Robert C. Kocher ,  Alfred Piorkow ,  Kenneth Shaner ,  J. Thomas Smith

发明人： Kenneth French ,  Robert C. Kocher ,  Alfred Piorkow ,  Kenneth Shaner ,  J. Thomas Smith

IPC分类号： G01B11/02

CPC分类号： G01B11/02

摘要： Apparatus for automatically measuring aperture size of apertured material includes a means for supporting and transporting the apertured material and a light source providing a light beam directed for passage through the apertured material to a light detector and is characterized by a comparator mask of alternate light transparent and opaque sectors of a given dimension and means for overlaying the apertured material with the comparator mask to provide a given length of light transparent slot and responsive to signals representing light transmitted through the given length of slot for deriving a signal representing the width of the slots of the slotted material. Also, a process for automatically measuring aperture size includes the steps of overlaying the slotted material with the comparator mask and utilizing a signal from the light detector representing light transmission of the slots of a given length to derive a signal representative of the slot width.

摘要翻译： 用于自动测量多孔材料的孔径尺寸的装置包括用于支撑和输送多孔材料的装置和一个光源，该光源提供一个指向的光束，以便通过多孔材料到光检测器，并且其特征在于： 给定尺寸的不透明扇区以及用于利用比较器掩模覆盖有孔材料的装置，以提供给定长度的光透明时隙，并且响应于表示通过给定长度的时隙传输的光的信号，用于导出表示槽的宽度的信号 开槽材料。 此外，用于自动测量孔径尺寸的过程包括以下步骤：用比较器掩模覆盖开槽材料，并利用表示给定长度的槽的光传输的光检测器的信号来导出代表槽宽度的信号。

公开(公告)号：US4400427A

公开(公告)日：1983-08-23

申请号：US333246

申请日：1981-12-21

申请人： Anthony P. Moschetti ,  J. Thomas Smith ,  Carr L. W. Quackenbush ,  Helmut Lingertat ,  Vincent W. Nehring

发明人： Anthony P. Moschetti ,  J. Thomas Smith ,  Carr L. W. Quackenbush ,  Helmut Lingertat ,  Vincent W. Nehring

IPC分类号： C04B35/584 ,  B32B9/04 ,  C04B35/58

CPC分类号： C04B35/584 ,  Y10T428/26

摘要： Sintered silicon nitride-silica-yttria ceramic articles having silica-rich or yttria-rich casing layers are disclosed. The surface layers are formed by sintering pre-compacted bodies in a powder setter bed to produce unitary sintered bodies having surface layers in which the atom ratio of yttrium to silicon has a smooth gradient from the surface of the article to the interior body of the article.

摘要翻译： 公开了具有富二氧化硅或氧化钇的外壳层的烧结氮化硅 - 二氧化硅 - 氧化钇陶瓷制品。 表面层通过在粉末固化床中烧结预压实体而形成，以产生具有表面层的单一烧结体，其中钇与硅的原子比具有从制品表面到制品内部的平滑梯度 。

公开(公告)号：US4603116A

公开(公告)日：1986-07-29

申请号：US781314

申请日：1985-09-27

申请人： J. Thomas Smith ,  Carr Lane W. Quackenbush ,  Anthony P. Moschetti ,  Helmut Lingertat

发明人： J. Thomas Smith ,  Carr Lane W. Quackenbush ,  Anthony P. Moschetti ,  Helmut Lingertat

IPC分类号： C04B35/584 ,  C04B35/58

CPC分类号： C04B35/584

摘要： A method of preparing fully dense silicon nitride based ceramic articles comprises the steps of blending a metal oxide component and silicon nitride, wherein a portion of the silicon nitride comprises acicular crystals; comminuting the powder mixture to reduce the aspect ratio of the acicular crystals to an average of less than about 3; pressing the comminuted powder to form a compact; and pressureless sintering the compact to a fully dense ceramic body. Powder mixtures and powder compacts for forming fully dense silicon nitride based ceramic bodies are also disclosed.

摘要翻译： 一种制备完全致密的氮化硅基陶瓷制品的方法包括以下步骤：混合金属氧化物组分和氮化硅，其中一部分氮化硅包括针状结晶; 将粉末混合物粉碎以将针状晶体的长宽比平均降低至约3; 挤压粉碎成粉末; 并将压块无压烧结成完全致密的陶瓷体。 还公开了用于形成完全致密的氮化硅基陶瓷体的粉末混合物和粉末压块。

公开(公告)号：US4383958A

公开(公告)日：1983-05-17

申请号：US333235

申请日：1981-12-21

申请人： Anthony P. Moschetti ,  J. Thomas Smith ,  Carr L. W. Quackenbush ,  Helmut Lingertat ,  Vincent W. Nehring

发明人： Anthony P. Moschetti ,  J. Thomas Smith ,  Carr L. W. Quackenbush ,  Helmut Lingertat ,  Vincent W. Nehring

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

CPC分类号： C04B35/5935 ,  Y10T428/26

摘要： Dense, composite, polycrystalline ceramic articles comprising silicon nitride, silicon dioxide, and yttrium oxide and having thin surface layers of controlled composition are formed by sintering pre-pressed compacts embedded in setter bed powder mixtures having compositions of silicon nitride, silicon dioxide, and yttrium oxide which differ from that of the pressed compact.Employing the method of this invention, articles are produced which have surface layers in which the minor phase of the article is enriched with either yttrium or silicon.

摘要翻译： 包含氮化硅，二氧化硅和氧化钇并且具有受控组成的薄表面层的密集的复合多晶陶瓷制品通过烧结嵌入在具有氮化硅，二氧化硅和钇的组成的固化床粉末混合物中的预压制成 氧化物与压制成型体的不同。 采用本发明的方法，生产具有表面层的制品，其中制品的微相富含钇或硅。

公开(公告)号：US4280850A

公开(公告)日：1981-07-28

申请号：US916334

申请日：1978-06-15

申请人： J. Thomas Smith ,  Carr L. W. Quackenbush ,  F. Joseph Reid

发明人： J. Thomas Smith ,  Carr L. W. Quackenbush ,  F. Joseph Reid

IPC分类号： C04B35/584 ,  C04B35/593 ,  C04B35/50 ,  C04B35/58

CPC分类号： C04B35/584 ,  C04B35/593

摘要： Polycrystalline ceramic bodies of Si.sub.3 N.sub.4 when prepared to obtain an intergranular phase which is substantially crystalline, exhibits significantly improved mechanical strength at elevated temperatures above 1,000.degree. C. up to 1600.degree. C. over bodies having glass-containing intergranular phases.

摘要翻译： 当准备获得基本上结晶的晶间相时，Si 3 N 4的多晶陶瓷体在具有含玻璃晶间相的体上在高于1000℃至高于1600℃的高温下表现出显着改善的机械强度。

公开(公告)号：US5579333A

公开(公告)日：1996-11-26

申请号：US772492

申请日：1985-09-04

申请人： Jeffrey T. Neil ,  J. Thomas Smith

发明人： Jeffrey T. Neil ,  J. Thomas Smith

IPC分类号： G02B7/18 ,  C02B5/08

CPC分类号： G02B7/1815

摘要： An improved cooled high power laser mirror system is described which uses ailicon mirror face with an attached silicon nitride based heat exchanger assembly. The silicon nitride provides a high strength, high toughness, and stiff backup assembly. The particular silicon nitride system is microstructurally engineered to provide a thermal expansion match to silicon designed to insure high quality bonding and minimum mirror distortion.

摘要翻译： 描述了一种改进的冷却大功率激光反射镜系统，其使用具有附接的氮化硅基热交换器组件的硅镜面。 氮化硅提供高强度，高韧性和刚性的后备组件。 特定的氮化硅系统被微结构设计以提供与设计用于确保高质量接合和最小镜面失真的硅的热膨胀匹配。

公开(公告)号：US4350771A

公开(公告)日：1982-09-21

申请号：US303445

申请日：1981-09-18

申请人： J. Thomas Smith

发明人： J. Thomas Smith

IPC分类号： C04B35/584 ,  C04B35/593 ,  C04B35/50 ,  C04B35/58

CPC分类号： C04B35/584 ,  C04B35/593

摘要： Si.sub.3 N.sub.4 polycrystalline ceramic bodies formed from starting materials containing about 2 to 4 weight percent SiO.sub.2, less than 0.1 weight percent cation impurities and Y.sub.2 O.sub.3 in critical amounts exhibit optimum oxidation resistance. Such bodies are useful as engine parts or components or as regenerator structures for waste heat recovery.

摘要翻译： 由起始材料形成的Si3N4多晶陶瓷体，其含有约2至4重量％的SiO 2，少于0.1重量％的阳离子杂质和临界量的Y 2 O 3表现出最佳的抗氧化性。 这样的物体可用作发动机部件或部件或用作废热回收的再生器结构。