公开(公告)号：US4962069A

公开(公告)日：1990-10-09

申请号：US268398

申请日：1988-11-07

申请人： Gary T. Burns ,  Chandan K. Saha ,  Ronald J. Keller

发明人： Gary T. Burns ,  Chandan K. Saha ,  Ronald J. Keller

IPC分类号： C04B35/571 ,  C04B35/575

CPC分类号： C04B35/575 ,  C04B35/571

摘要： The preparation of highly densified ceramic bodies by the sintering of certain preceramic polysilazanes filled with silicon carbide powders, metal-containing sintering aids, and, optionally, polysilazane curing agents is described. Such highly densified ceramic bodies can be prepared by either a pressureless sintering process or a hot press sintering process. The compositions of this invention can be formed into desired shapes and then sintered to form ceramic, shaped bodies with high densities. One advantage of the present invention is that the green bodies have relative high strengths and thus can be easily handled and, if desired, machined before sintering. The preceramic polysilazanes useful in this invention must yield ceramic chars which contains free or excess carbon in addition to carbon in the form of silicon carbide upon pyrolysis to elevated temperatures.

公开(公告)号：US4888376A

公开(公告)日：1989-12-19

申请号：US248884

申请日：1988-09-26

申请人： William H. Atwell ,  Gary T. Burns ,  Chandan K. Saha

发明人： William H. Atwell ,  Gary T. Burns ,  Chandan K. Saha

IPC分类号： C04B35/571 ,  C04B35/575 ,  C08K3/34 ,  C08L83/04

CPC分类号： C04B35/575 ,  C04B35/571

摘要： The preparation of highly densified ceramic bodies by sintering certain curable organopolysiloxanes filled with silicon carbide powders, metal-containing sintering aids, and organopolysiloxane curing agents described. Such highly densified ceramic bodies can be prepared by either a pressure-less or a hot press sintering process. The compositions of this invention can be formed into desired shapes and then sintered to form ceramic, shaped bodies with high densities. One advantage of the present invention is that the green bodies have relative high strengths and thus can be easily handled and, if desired, machined before sintering. The curable organopolysiloxanes useful in this invention must yield a ceramic char which contains free or excess carbon in addition to carbon in the form of silicon carbide upon pyrolysis to elevated temperatures.

公开(公告)号：US4929573A

公开(公告)日：1990-05-29

申请号：US249036

申请日：1988-09-26

申请人： William H. Atwell ,  Gary T. Burns ,  Chandan K. Saha

发明人： William H. Atwell ,  Gary T. Burns ,  Chandan K. Saha

IPC分类号： C04B35/571 ,  C04B35/575 ,  C08K3/34 ,  C08L83/04

CPC分类号： C04B35/575 ,  C04B35/571

摘要： The preparation of highly densified ceramic bodies by the sintering of certain organopolysiloxanes filled with silicon carbide powders, and metal-containing sintering aids is described. Such highly densified ceramic bodies can be prepared by either a pressureless sintering process or a hot press sintering process. The compositions of this invention can be formed into desired shapes and then sintered to form ceramic, shaped bodies with high densities. One advantage of the present invention is that the green bodies have relative high strengths and thus can be easily handles and, if desired, machined before sintered. The organopolysiloxanes useful in this invention must yield a ceramic char which contains free or excess carbon in addition to carbon in the form of silicon carbide upon pyrolysis to elevated temperatures.

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。

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。

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.

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。

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。

公开(公告)号：US4916200A

公开(公告)日：1990-04-10

申请号：US213380

申请日：1988-06-30

申请人： Gary T. Burns

发明人： Gary T. Burns

IPC分类号： C04B35/571 ,  C04B35/589 ,  C08G77/62

CPC分类号： C08G77/62 ,  C04B35/571 ,  C04B35/589

摘要： Polysilacyclobutasilazanes are reacted with chlorosilanes and/or chlorodisilanes and ammonia to provide silane-modified polysilacyclobutasilazanes having silacycles incorporated in the polymer, which silacycles are subsequently used to cross-link the silazanes.

公开(公告)号：US4835238A

公开(公告)日：1989-05-30

申请号：US059718

申请日：1987-06-08

申请人： Gary T. Burns

发明人： Gary T. Burns

IPC分类号： C01B21/068 ,  C04B35/571 ,  C04B35/589 ,  C08G77/48 ,  C08G77/62

CPC分类号： C04B35/589 ,  C04B35/571 ,  C08G77/62

摘要： The reaction of 1,1-dichlorosilacyclobutanes with nitrogen-containing difunctional nucleophiles gives polysilacyclobutasilazanes which can be crosslinked and also converted to ceramic materials.