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51. 发明授权

US4892848A Silicon nitride sintered body and process for preparation thereof 失效
标题翻译：氮化硅烧结体及其制备方法
公开(公告)号：US4892848A
公开(公告)日：1990-01-09
申请号：US891854
申请日：1986-07-29
申请人： Makoto Yoshida , Kiyoshi Yokoyama
发明人： Makoto Yoshida , Kiyoshi Yokoyama
IPC分类号： C04B35/584 , C04B35/593
CPC分类号： C04B35/5935
摘要： Disclosed is a process for the preparation of a silicon nitride sintered body, which comprises steps of (i) molding a composition comprising (a) 87 to 98% by weight of silicon nitride and (b) 2 to 13% by weight of a sintering aid comprising an oxide or nitride of aluminum or an element of the group IIIa of the Periodic Table and an inorganic oxide capable of forming a liquid phase component having a melting point lower than that of silicon nitride, the inorganic oxide being present in an amount of 1 to 7% by weight based on the composition, (ii) sintering the molded body in a nitrogen atmosphere at a temperature forming a liquid phase containing said liquid phase component having a low melting point, and (iii) heat-treating the resulting sintered body in a nitrogen atmosphere at a temperature higher than the sintering temperature to volatilize the liquid phase component having a low melting point from the liquid phase.In the obtained sintered body, the oxygen content in the surface layer is controlled below 3% by weight, and the flexural strength at 1300.degree. C. of the surface layer is higher than that of the inner portion.
摘要翻译：公开了一种制备氮化硅烧结体的方法，其包括以下步骤：（i）模制组合物，所述组合物包含（a）87至98重量％的氮化硅和（b）2至13重量％的烧结辅助剂包括铝的氧化物或氮化物或元素周期表IIIa族的元素和能够形成熔点低于氮化硅的液相成分的无机氧化物，无机氧化物以 1〜7重量％，（ii）在形成含有低熔点液相成分的液相的温度下，在氮气气氛中烧结成型体，（iii）对得到的烧结体进行热处理在氮气气氛中，在高于烧结温度的温度下，从液相挥发具有低熔点的液相成分。在得到的烧结体中，将表面层的氧含量控制在3重量％以下，表面层的1300℃的弯曲强度高于内部部分的弯曲强度。

52. 发明授权

US4888310A Pulverulent silicon nitride composition including oxidized silicon carbide whiskers 失效
标题翻译：粉状氮化硅组合物包括氧化碳化硅晶须
公开(公告)号：US4888310A
公开(公告)日：1989-12-19
申请号：US124597
申请日：1987-11-24
申请人： Dominique Richon , Olivier De Pous , Pierre Fontaine
发明人： Dominique Richon , Olivier De Pous , Pierre Fontaine
IPC分类号： C04B35/584 , C04B35/593 , C04B35/645 , C04B35/80
CPC分类号： C04B35/6455 , C04B35/584 , C04B35/593 , C04B35/806 , Y10T428/2918 , Y10T428/2938 , Y10T428/2949
摘要： Reinforcing Si.sub.3 N.sub.4 ceramics with preoxidized SiC whiskers improves flexural strength and WEIBULL modulus over that of comparable bulk Si.sub.3 N.sub.4 ceramics or Si.sub.3 N.sub.4 ceramics reinforced with neat SiC whiskers. Hot isostatic pressing further improves the physical properties of said ceramics.
摘要翻译：用预氧化的SiC晶须增强Si3N4陶瓷提高了抗弯强度和WEIBULL模量，而不仅仅是可比较的体积为Si3N4的陶瓷或Si3N4陶瓷，而是用纯SiC晶须增强。热等静压进一步提高了所述陶瓷的物理性能。

53. 发明授权

US4880756A Silicon nitride sintered product 失效
标题翻译：氮化硅烧结产品
公开(公告)号：US4880756A
公开(公告)日：1989-11-14
申请号：US238429
申请日：1988-08-31
申请人： Kazuhiro Urashima , Masakazu Watanabe , Yo Tajima , Kenji Nakanishi
发明人： Kazuhiro Urashima , Masakazu Watanabe , Yo Tajima , Kenji Nakanishi
IPC分类号： C04B35/584 , C04B35/593
CPC分类号： C04B35/584 , C04B35/5935
摘要： A silicon nitride sintered product comprises, in % by weight, 1 to 10% Mg, calculated as MgO, 1 to 10% Zr, calculated as ZrO.sub.2, 0.1 to 2.0% of at least one of Al, calculated as Al.sub.2 O.sub.3, Li, calculated as Li.sub.2 O, and Na, calculated as Na.sub.2 O, and the remainder being Si.sub.3 N.sub.4 and unavoidable impurities.

54. 发明授权

US4769350A Silicon nitride sintered material for cutting tools and process for making the same 失效
标题翻译：用于切削刀具的氮化硅烧结材料及其制造方法
公开(公告)号：US4769350A
公开(公告)日：1988-09-06
申请号：US102922
申请日：1987-09-30
申请人： Takao Nishioka , Akira Yamakawa , Masaya Miyake
发明人： Takao Nishioka , Akira Yamakawa , Masaya Miyake
IPC分类号： C04B35/584 , C04B35/593 , C04B35/58
CPC分类号： C04B35/584 , C04B35/593
摘要： A silicon nitride sintered material for cutting tools comprising from about 3 to 10 wt % of partially stablized zirconium oxide, from about 1 to 5 wt % of aluminum oxide, and from about 1 to 10 wt % of yttrium oxide, the balance being silicon nitride, and the process for making the same.

55. 发明授权

US4732719A Superplastic forging nitride ceramics 失效
标题翻译：超塑性锻造氮化陶瓷
公开(公告)号：US4732719A
公开(公告)日：1988-03-22
申请号：US816040
申请日：1986-01-03
申请人： Prakash C. Panda , Edgar R. Seydel , Rishi Raj
发明人： Prakash C. Panda , Edgar R. Seydel , Rishi Raj
IPC分类号： C04B35/58 , C04B35/581 , C04B35/593 , C04B33/32
CPC分类号： C04B35/645 , C04B35/593
摘要： The invention relates to producing relatively flaw free silicon nitride ceramic shapes requiring little or no machining by superplastic forgingThis invention herein was made in part under Department of Energy Grant DE-AC01-84ER80167, creating certain rights in the United States Government. The invention was also made in part under New York State Science and Technology Grant SB1R 1985-10.
摘要翻译：本发明涉及生产相对无缺陷的氮化硅陶瓷形状，其需要很少或不需要通过烧结或部分烧结的预制件的超塑性锻造加工。通过湿式或干式混合制备起始粉末来制备预成型体，该组合物包含重量约70％至约99％的氮化硅，约1％至约30％的液相形成添加剂和0至约7％冷却至围绕约1至约2.5兆克/立方米的绿色密度的预成型坯，并在大气压下在氮气中在约1400℃至约2200℃的温度下进行至少部分烧结。超塑性锻造通过使用温度和应变速率将预型件等温地压制成基本上最终形状来进行，使得不发生表面裂纹，例如利用1650℃的温度，基于2×10 -4秒-1的初始应变速率基本上恒定的位移速率和在石墨模具中的开模处理。本发明还涉及其他氮化物及其与颗粒碳化钛的复合材料的超塑性锻造。

56. 发明授权

US4622186A Process for preparation sintered silicon nitride body having surface compression stress 失效
标题翻译：具有表面压应力的烧结氮化硅体的制备方法
公开(公告)号：US4622186A
公开(公告)日：1986-11-11
申请号：US708090
申请日：1985-03-05
申请人： Michitaka Mizutani
发明人： Michitaka Mizutani
IPC分类号： C04B35/584 , C04B35/593 , C04B41/50 , C04B41/87 , C04B35/58
CPC分类号： C04B41/009 , C04B35/593 , C04B41/5066 , C04B41/87
摘要： In preparing a sintered silicon nitride body by hot isostatic pressing, a composition comprising Si.sub.3 N.sub.4 and a sintering aid is molded to form a green molded body, the surface of the green molded body is coated with a composition comprising Si.sub.3 N.sub.4 and a sintering aid and having a sintering temperature lower than that of the composition of the green molded body, the coated green molded body is preliminarily sintered so that only the coating layer is densified, and the preliminarily sintered molded body is subjected to hot isostatic pressing. The obtained sintered body has a surface compression stress, and by this surface compression stress, not only the strength at room temperature but also the strength at high temperatures is improved.
摘要翻译：在通过热等静压制备烧结氮化硅体的过程中，将包含Si 3 N 4和烧结助剂的组合物模制成生坯成型体，将生坯成型体的表面涂覆有包含Si 3 N 4和烧结助剂的组合物，烧结温度低于绿色成型体的成分，预先烧结涂覆的绿色成型体，使得只有涂层致密化，并对预烧结的成形体进行热等静压。所获得的烧结体具有表面压缩应力，并且通过该表面压缩应力，不仅提高了室温下的强度，而且提高了高温下的强度。

57. 发明授权

US4609633A Silicon nitride sintered body and method for preparing the same 失效
标题翻译：氮化硅烧结体及其制备方法
公开(公告)号：US4609633A
公开(公告)日：1986-09-02
申请号：US602555
申请日：1984-04-20
申请人： Mikio Fukuhara , Yoshitaka Maekawa
发明人： Mikio Fukuhara , Yoshitaka Maekawa
IPC分类号： C04B35/584 , C04B35/593 , C04B35/58
CPC分类号： C04B35/593 , C04B35/584
摘要： There is disclosed a silicon nitride body consisting essentially of(A) 0.5 to 25% by weight of at least one of oxides, nitrides and oxynitrides of rare earth elements consisting of Sc, Y and lanthanide elements;(B) 0.5 to 25% by weight of at least one of the nitrides and oxynitrides of elements consisting of Be, Mg, Ca, Sr, Ba and Ra in group IIa and/or of nitrides and oxynitrides of elements consisting of B, Al, Ga, In and Tl in group IIIb of the periodic table; and(C) a remainder including Si.sub.3 N.sub.4 and inevitable impurities.The silicon nitride sintered body of this invention has excellent wear resistance and toughness, and is suitable for an industrial production of materials for heat resistant structures.
摘要翻译：公开了一种氮化硅体，其主要由（A）0.5〜25重量％的由Sc，Y和镧系元素组成的稀土元素的氧化物，氮化物和氮氧化物中的至少一种组成; （B）IIa中由Be，Mg，Ca，Sr，Ba和Ra组成的元素的氮化物和氮氧化物中的至少一种为0.5〜25重量％，和/或由B，Al组成的元素的氮化物和氮氧化物中的至少一种，元素周期表IIIb族中的Ga，In和Tl; 和（C）余量包括Si 3 N 4和不可避免的杂质。本发明的氮化硅烧结体具有优异的耐磨性和韧性，适用于耐热结构材料的工业化生产。

58. 发明授权

US4557244A Method of machine cutting silicon metal particulates with Si.sub.3 N.sub.4 失效
标题翻译：用Si3N4机械切割硅金属微粒的方法
公开(公告)号：US4557244A
公开(公告)日：1985-12-10
申请号：US612106
申请日：1984-04-13
申请人： Richard L. Allor
发明人： Richard L. Allor
IPC分类号： B24B27/06 , B24D3/00 , B28D1/02 , B28D5/00 , C04B35/584 , C04B35/593 , B28D1/00
CPC分类号： C04B35/593 , B28D5/00 , C04B35/584 , Y10T409/303752
摘要： A method is disclosed of machine cutting a semidense silicon comprising particulate body by relatively moving a substantially fully dense silicon nitride cutting tool against the body. The silicon nitride tool experiences increased tool life over that of carbides or tool steels heretofore used to machine cut low density, highly abrasive metals.
摘要翻译： PCT No.PCT / US84 / 00583 Sec。 371日期1984年4月13日 102（e）1984年4月13日PCT 1984年4月13日提交PCT公开了一种通过相对地移动基本上完全致密的氮化硅切割工具抵靠身体来机械切割包括颗粒体的半透明硅的方法。氮化硅工具比以前用于机械切割低密度，高度磨蚀性金属的碳化物或工具钢的刀具寿命提高。

59. 发明授权

US4534835A Electrolytic Al production with reaction sintered multiphase ceramic 失效
标题翻译：电解铝生产与反应烧结多相陶瓷
公开(公告)号：US4534835A
公开(公告)日：1985-08-13
申请号：US454674
申请日：1982-12-30
申请人： Thomas P. DeAngelis
发明人： Thomas P. DeAngelis
IPC分类号： C04B35/58 , C04B35/581 , C04B35/593 , C04B35/65 , C25C3/08 , C25C3/06
CPC分类号： C04B35/58092 , C04B35/58014 , C04B35/58071 , C04B35/581 , C04B35/593 , C04B35/645 , C04B35/65 , C25C3/08
摘要： Component of electrowinning or electrorefining cell, which component in use is normally in contact with molten aluminum or in electrical contact with another component which is in contact with molten aluminum. Surface and/or inner portion of component is made of ceramic body formed by reaction sintering at pressures ranging from subatmospheric to superatmospheric of reactants, which can be elements, compounds, intermetallic compounds and/or alloys, in stoichiometric proportions to substantially from 5-95 mole percent of first phase or phases being boride, carbide, silicide, and/or sulfide of one or more of the elements of Groups 4b, 5b and 6b, which phases have a maximum grain size substantially not greater than 10 .mu.m. and which body contains 0 to 4 weight percent oxygen. Also production cell, and method of producing aluminum in such cell, with the reaction sintered ceramic component.
摘要翻译：电解冶金或电解精炼电池的组分，其中使用的组分通常与熔融铝接触或与与熔融铝接触的另一组分电接触。部件的表面和/或内部由陶瓷体制成，陶瓷体通过在低于大气压至超大气压的反应烧结下形成，所述反应物可以是化学计量比例的元素，化合物，金属间化合物和/或合金，基本上为5-95 第一相或相的摩尔百分数是组4b，5b和6b中的一种或多种元素的硼化物，碳化物，硅化物和/或硫化物，这些相具有基本上不大于10μm的最大晶粒尺寸。并且该主体含有0至4重量％的氧气。还有生产电池，以及在这种电池中生产铝的方法，与反应烧结陶瓷组分。

60. 发明授权

US4506024A Ceramic formed body with a high crack arrestability 失效
标题翻译：陶瓷成型体具有较高的抗裂性
公开(公告)号：US4506024A
公开(公告)日：1985-03-19
申请号：US528466
申请日：1983-09-01
申请人： Nils Claussen , Gunter Petzow
发明人： Nils Claussen , Gunter Petzow
IPC分类号： C04B35/10 , C04B35/00 , C04B35/101 , C04B35/117 , C04B35/119 , C04B35/18 , C04B35/185 , C04B35/443 , C04B35/48 , C04B35/488 , C04B35/584 , C04B35/593 , F02F7/00
CPC分类号： C04B35/117 , C04B35/119 , C04B35/185 , C04B35/443 , C04B35/4885 , C04B35/584 , C04B35/593 , C04B35/645 , F02F7/0087 , C04B2235/3217 , C04B2235/3222 , C04B2235/3225 , C04B2235/3244 , C04B2235/3248 , C04B2235/3418 , C04B2235/441 , C04B2235/5436 , C04B2235/5445 , C04B2235/662 , C04B2235/765 , C04B2235/785 , C04B2235/79 , C04B2235/80 , C04B2235/96
摘要： The present invention is concerned with a ceramic formed body comprising a ceramic matrix and at least one phase of ceramic incorporation material dispersed therein, characterized by a dense, microcrack-free ceramic base matrix and compressive zones incorporated therein which consist of a mixture of the base matrix material with unstabilized zirconium dioxide particles which are predominantly monoclinic at ambient temperature.The present invention is also concerned with a process for the production of such ceramic formed bodies and with the use thereof as constructional elements in the hot region of heat engines.
摘要翻译：本发明涉及一种陶瓷成形体，其包括陶瓷基体和分散在其中的陶瓷结合材料的至少一相，其特征在于致密的无微裂纹的陶瓷基体和掺入其中的压缩区，其由碱的混合物基体材料与未稳定的二氧化锆颗粒在环境温度下主要为单斜晶系。本发明还涉及生产这种陶瓷成形体的方法，并且其用作热机的热区域的结构元件。

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