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26 条记录 (耗时 0.017 秒)

    Preceramic metallopolysilanes
    1.
    发明授权
    Preceramic metallopolysilanes 失效
    前陶瓷金属多晶硅

    公开(公告)号：US4945072A

    公开(公告)日：1990-07-31

    申请号：US457120

    申请日：1989-12-11

    申请人： Gary T. Burns ,  Gregg A. Zank

    发明人： Gary T. Burns ,  Gregg A. Zank

    IPC分类号： C04B35/571 ,  C08G77/60 ,  C08G79/00

    CPC分类号： C08G77/60 ,  C04B35/571 ,  C08G79/00

    摘要： A process for the preparation of preceramic metallopolysilanes is described. The process consists of reacting polysilanes with metallic compounds from which can be generated open coordination sites associated with the metallic element. Such open coordination sites can be generated by the reduction of the metallic compound with an alkali metal reducing agent, or by heating a metallic compound which has thermally labile ligands, or by the UV irradiation of a carbonyl-containing metallic compound. The metals which can be incorporated into the polysilane include aluminum, boron, chromium, molybdenum, tungsten, titanium, zirconium, hafnium, vanadium, niobium, and tantalum. These metallopolysilanes are useful, when fired at high temperatures, to form metal-containing ceramic materials.

    摘要翻译： 描述了制备前陶瓷金属多硅烷的方法。 该方法包括使聚硅烷与金属化合物反应，由此可以产生与金属元素相关的开放配位点。 可以通过用碱金属还原剂还原金属化合物，或加热具有热不稳定性配体的金属化合物，或通过含有羰基的金属化合物的紫外线照射来产生这种开放的配位点。 可以结合到聚硅烷中的金属包括铝，硼，铬，钼，钨，钛，锆，铪，钒，铌和钽。 当在高温下焙烧时，这些金属多晶硅是有用的，以形成含金属的陶瓷材料。

    Preceramic polycarbosilane derivatives
    2.
    发明授权
    Preceramic polycarbosilane derivatives 失效
    前陶瓷聚碳硅烷衍生物

    公开(公告)号：US4761458A

    公开(公告)日：1988-08-02

    申请号：US85826

    申请日：1987-08-17

    申请人： Gary T. Burns ,  Paul P. Lu ,  Gregg A. Zank

    发明人： Gary T. Burns ,  Paul P. Lu ,  Gregg A. Zank

    IPC分类号： C04B35/571 ,  C08G77/48 ,  C08G77/60 ,  C08F283/00

    CPC分类号： C08G77/60 ,  C04B35/571

    摘要： Halogenated polycarbosilanes are prepared by reacting a polycarbosilane containing at least 0.1 weight percent Si-H groups with a halogenating reagent selected from the group consisting of chlorine, bromine, phosphorous pentachloride, phosphorous pentabromide, antimony pentachloride, N-chlorosuccinimide, N-bromosuccinimide, sulfonyl chloride, and mixtures of CH.sub.e X.sub.f and a free radical initiator where e is 0 or 1, f is 3 or 4, the sum (e+f) is 4, and X is chlorine or bromine. The halogenated polycarbosilanes can be further treated to produce other derivatized polycarbosilanes. The halogenated and derivatized polycarbosilanes can be converted to silicon carbide-containing ceramic materials by pyrolysis at elevated temperatures under an inert atmosphere.

    High density silicon carbide sintered bodies from borosiloxanes
    4.
    发明授权
    High density silicon carbide sintered bodies from borosiloxanes 失效
    来自硼硅氧烷的高密度碳化硅烧结体

    公开(公告)号：US5112779A

    公开(公告)日：1992-05-12

    申请号：US674005

    申请日：1991-03-25

    申请人： Gary T. Burns ,  Gregg A. Zank

    发明人： Gary T. Burns ,  Gregg A. Zank

    IPC分类号： C04B35/571

    CPC分类号： C04B35/571

    摘要： This invention relates to the preparation of highly densified ceramic bodies by the pyrolysis of a mixture comprising a preceramic borosiloxane, silicon carbide powder, a curing agent for the borosiloxane, a crosslinking agent for the borosiloxane and, optionally, additional components to facilitate sintering. Such highly densified ceramic bodies can be prepared by sintering under pressure or by a pressureless sintering process.

    摘要翻译： 本发明涉及通过热解包含前陶瓷硼硅氧烷，碳化硅粉末，硼硅氧烷固化剂，硼硅氧烷交联剂和任选的另外的组分以促进烧结的混合物来制备高致密陶瓷体。 这种高度致密化的陶瓷体可以通过在压力下或通过无压烧结工艺烧结来制备。

    Preceramic metallopolysilanes
    5.
    发明授权
    Preceramic metallopolysilanes 失效
    前陶瓷金属多晶硅

    公开(公告)号：US4906710A

    公开(公告)日：1990-03-06

    申请号：US264561

    申请日：1988-10-31

    申请人： Gary T. Burns ,  Gregg A. Zank

    发明人： Gary T. Burns ,  Gregg A. Zank

    IPC分类号： C04B35/571 ,  C08G77/48 ,  C08G77/60 ,  C08G79/00

    CPC分类号： C08G77/60 ,  C04B35/571 ,  C08G79/00

    摘要： A process for the preparation of preceramic metallopolysilanes is described. The process consists of reacting polysilanes with metallic compounds from which can be generated open coordination sites associated with the metallic element. Such open coordination sites can be generated by the reduction of the metallic compound with an alkali metal reducing agent, or by heating a metallic compound which has thermally labile ligands, or by the UV irradiation of a carbonyl-containing metallic compound. The metals which can be incorporated into the polysilane include aluminum, boron, chromium, molybdenum, tungsten, titanium, zirconium, hafnium, vanadium, niobium, and tantalum. These metallopolysilanes are useful, when fired at high temperatures, to form metal-containing ceramic materials.

    Pre-ceramic methylpolysilanes
    6.
    发明授权
    Pre-ceramic methylpolysilanes 失效
    预陶瓷甲基聚硅烷

    公开(公告)号：US4921917A

    公开(公告)日：1990-05-01

    申请号：US103275

    申请日：1987-10-01

    申请人： Gary T. Burns

    发明人： Gary T. Burns

    IPC分类号： C08G77/60

    CPC分类号： C08G77/60

    摘要： An improvement in pre-ceramic methylpolysilanes that utilizes the reaction of methylpolysilanes with multiple-unsaturated compounds to reduce the number of ternary and highly reduced silicon atoms in the polymer matrix. Polymers thus modified are generally easier to process into ceramic fibers than prior art methylpolysilanes.

    摘要翻译： 利用甲基聚硅烷与多不饱和化合物的反应来减少聚合物基体中三元和高度还原的硅原子的数量，改进了前陶瓷甲基聚硅烷。 如此改性的聚合物通常比现有技术的甲基聚硅烷更容易加工成陶瓷纤维。

    Polyorganooxothiazenes and method for preparing same
    7.
    发明授权
    Polyorganooxothiazenes and method for preparing same 失效
    聚有机基异噻唑及其制备方法

    公开(公告)号：US5194557A

    公开(公告)日：1993-03-16

    申请号：US644761

    申请日：1991-01-23

    申请人： Aroop K. Roy ,  Gary T. Burns

    发明人： Aroop K. Roy ,  Gary T. Burns

    IPC分类号： C08G83/00

    CPC分类号： C08G83/00

    摘要： This invention provides polyorganooxothiazenes exhibiting levels of molecular weight and properties not heretofore achieved by similar polymers reported in the prior art. The sulfonimidates that are condensed to form the polymers are prepared using a novel reaction between an N-triorganosilylsulfonamide and a triorganodihalophosphorane to form the corresponding N-triorganosilylsulfonimidoyl halide that is subsequently reacted with a fluorinated alcohol or phenol to form the N-triorgano-silylsulfonimidate.

    摘要翻译： 本发明提供了表现出迄今为止通过现有技术中报道的相似聚合物所达到的分子量和性能水平的聚有机基异硫噻唑。 缩合形成聚合物的磺酰亚胺酸酯使用N-三有机甲硅烷基磺酰胺和三有机二卤代磷烷之间的新反应制备，形成相应的N-三有机甲硅烷基亚氨基亚氨基卤化物，随后与氟化醇或苯酚反应形成N-三有机 - 甲硅烷基亚磺酰亚胺酯。

    Infusible preceramic polymers via ultraviolet treatment in the presence of a reactive gas
    8.
    发明授权
    Infusible preceramic polymers via ultraviolet treatment in the presence of a reactive gas 失效
    在反应性气体存在下通过紫外线处理可燃的陶瓷前陶瓷聚合物

    公开(公告)号：US5082872A

    公开(公告)日：1992-01-21

    申请号：US119599

    申请日：1987-11-12

    申请人： Gary T. Burns ,  Leslie D. Fontaine ,  Ronald S. Reaoch

    发明人： Gary T. Burns ,  Leslie D. Fontaine ,  Ronald S. Reaoch

    IPC分类号： C01B21/082 ,  C01B31/00 ,  C04B35/56 ,  C04B35/571 ,  C04B35/622 ,  C08F283/06 ,  C08F283/12 ,  C08G77/48 ,  C08G77/60 ,  C08J7/00 ,  C08L83/16 ,  D01F9/10 ,  D01F9/127

    CPC分类号： B82Y30/00 ,  C04B35/62272 ,  C08G77/60 ,  C08L83/16 ,  D01F9/127

    摘要： A method is disclosed for the preparation of ceramic materials or articles by the pyrolysis of preceramic polysilanes wherein the preceramic polysilanes are rendered infusible prior to pyrolysis by exposure to ultraviolet irradiation in the presence of a reactive gas selected from the group consisting of ethylene, 1,3-butadiene, 2-methyl-1,3-butadiene, 1,4-pentadiene, silane, chlorosilane, dichlorosilane, boron trichloride, oxygen and water mixture, acetylene, and tetravinylsilane. This method is especially suited for the preparation of ceramic fibers. The ceramic fiber's surface properties can be modified by the practice of this invention; for example, a ceramic fiber with a carbon rich surface layer can be obtained when 1,3-butadiene is used as the reactive gas.

    摘要翻译： 公开了一种用于通过预陶瓷聚硅烷的热解制备陶瓷材料或制品的方法，其中在存在选自以下的反应性气体的情况下，在陶瓷聚硅烷通过暴露于紫外线照射进行热解之前使其不可熔化，所述反应性气体选自乙烯， 3-丁二烯，2-甲基-1,3-丁二烯，1,4-戊二烯，硅烷，氯硅烷，二氯硅烷，三氯化硼，氧和水混合物，乙炔和四乙烯基硅烷。 该方法特别适用于陶瓷纤维的制备。 陶瓷纤维的表面性能可以通过本发明的实践来改变; 例如，当使用1,3-丁二烯作为反应气体时，可以获得具有富碳表面层的陶瓷纤维。