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    • 6. 发明授权
    • Polymeric hydridochlorosilazanes, process for their preparation, ceramic
materials containing silicon nitride which can be manufactured
therefrom, and their manufacture
    • 聚合氢氯硅氮烷,其制备方法,可由其制造的含氮化硅的陶瓷材料及其制造方法
    • US5189132A
    • 1993-02-23
    • US759035
    • 1991-09-05
    • Tilo VaahsThomas GerdauHans-Jerg KleinerMarcellus PeuckertMartin Bruck
    • Tilo VaahsThomas GerdauHans-Jerg KleinerMarcellus PeuckertMartin Bruck
    • C04B35/589C08G77/62
    • C04B35/589C08G77/62
    • The invention relates to novel polymeric hydridochlorosilazanes, to their preparation, to their processing to form ceramic materials containing silicon nitride, and to said materials themselves. The polymeric hydridochlorosilazanes are prepared by reacting oligohydridoorganosilazanes of the general formula (R.sup.1 SiHNH).sub.n, in which n is about 3 to about 12, with at least one of the chlorosilanes R.sup.2 SiHCl.sub.2, R.sup.3 SiCl.sub.3, Cl.sub.2 R.sup.4 Si--CH.sub.2 CH.sub.2 --SiR.sup.4 Cl.sub.2 or Cl.sub.3 Si--CH.sub.2 CH.sub.2 --SiR.sup.5 Cl.sub.2 at 30.degree. C. to 300.degree. C., where the radicals independently of one another have the following meanings:R.sup.1 =a C.sub.1 -C.sub.6 alkyl or C.sub.2 -C.sub.6 alkenyl group,R.sup.2 =a C.sub.2 -C.sub.6 alkenyl group if R.sup.2 SiHCl.sub.2 is reacted with the oligosilazanes by itself, orR.sup.2 =a C.sub.1 -C.sub.6 alkyl or C.sub.2 -C.sub.6 alkenyl group if R.sup.2 SiHCl.sub.2 is reacted with the oligosilazanes as a mixture with other chlorosilanes, andR.sup.3, R.sup.4, R.sup.5 =a C.sub.1 -C.sub.6 alkyl or C.sub.C.sub.2 -C.sub.6 alkenyl group,and where R.sup.3 SiCl.sub.3 is used only as a mixture with at least one of the other chlorosilanes (containing R.sup.2, R.sup.4 or R.sup.5).The polymeric hydridochlorosilazanes according to the invention can be converted into polysilazanes by reaction with ammonia, and these in turn can be pyrolyzed to form ceramic materials containing silicon nitride.
    • 本发明涉及新型的聚合氯化二氯硅氮烷,用于其制备,以形成含有氮化硅的陶瓷材料的加工,以及所述材料本身。 通过使通式(R1SiHNH)n的低聚氢化有机硅氮烷(其中n为约3至约12)与至少一种氯代硅烷R 2 SiHCl 2,R 3 SiCl 3,Cl 2 R 4 Si-CH 2 CH 2 -SiR 4 Cl 2或Cl 3 Si-CH 2 CH 2 -SiR 5 Cl 2中的至少一种反应来制备聚合的氢氯硅氮烷, 30℃至300℃,其中彼此独立的基团具有以下含义:R 1 = C 1 -C 6烷基或C 2 -C 6烯基,如果R 2 SiHCl 2与C 2 -C 6烯基反应,则R 2 = C 2 -C 6烯基 如果R2SiHCl2与低聚硅氮烷作为与其它氯硅烷的混合物反应,则R2 = C1-C6烷基或C2-C6烯基,R3,R4,R5 = C1-C6烷基或CC2-C6烯基 ,并且其中R 3 SiCl 3仅与至少一种其它氯硅烷(包含R 2,R 4或R 5)一起使用。 根据本发明的聚合物氯化硅烷可以通过与氨的反应转化为聚硅氮烷,并且这些可以热解而形成含有氮化硅的陶瓷材料。
    • 7. 发明授权
    • Sinterable ceramic powder, process for its production, silicon nitride
ceramic produced therefrom, process for its production and its use
    • US5162272A
    • 1992-11-10
    • US498266
    • 1990-03-23
    • Marcellus PeuckertTilo VaahsMartin BruckHans-Jerg KleinerRalf RiedelMartin SehrGunter Petzow
    • Marcellus PeuckertTilo VaahsMartin BruckHans-Jerg KleinerRalf RiedelMartin SehrGunter Petzow
    • C01B21/068C04B35/589C04B35/626
    • C04B35/589
    • The invention relates to a novel sinterable ceramic powder, to its preparation and to its further processing to give a silicon nitride ceramic, and to this material itself and its use. The sinterable ceramic powder is produced by melting a polysilazane or dissolving it in an organic solvent, suspending a powdered sinter aid in this melt or solution, then pyrolyzing the melt, or the residue obtained after evaporation of the solvent, at 500.degree. to 1600.degree. C. in a protective gas atmosphere, the polysilazane eitherA) being obtainable by reacting at least one of the oligosilazanes of the formula (I) ##STR1## in which a, b, c and d are the mole fractions of the respective structural units and where 0.ltoreq.a.ltoreq.1, 0.ltoreq.b.ltoreq.1, 0.ltoreq.c.ltoreq.0.7, 0.ltoreq.d.ltoreq.0.7, 0.3.ltoreq.a+b, c+d.ltoreq.0.7 and n is approximately 2 to approximately 12, with at least one of the chlorosilanes R.sup.6 R.sup.7 SiCl.sub.2, R.sup.8 SiCl.sub.3, Cl.sub.2 R.sup.9 Si--CH.sub.2 CH.sub.2 --SiR.sup.9 Cl.sub.2 and Cl.sub.3 Si--CH.sub.2 CH.sub.2 SiR.sup.10 Cl.sub.2 at 30.degree. to 300.degree. C., where, independently of one another, R.sup.1, R.sup.2, R.sup.4, R.sup.6, R.sup.7 and R.sup.8 are H, C.sub.1 -C.sub.6 -alkyl or C.sub.2 -C.sub.6 -alkenyl and R.sup.3, R.sup.5, R.sup.9 and R.sup.10 are C.sub.1 -C.sub.6 -alkyl or C.sub.2 -C.sub.6 -alkenyl, orB) having the following formula ##STR2## in which R and R* can be identical or different and R and R* are C.sub.1 -C.sub.4 -alkyl, vinyl or phenyl and R' is C.sub.1 -C.sub.4 -alkyl and x and y are the mole fractions of the two structural units, where x+y=1 and x=0.7-0.95.A molded article can be formed from the ceramic powder thus obtained and a silicon nitride ceramic then produced by sintering. However, a molded article can also be formed from the solidified melt or the still unpyrolyzed residue obtained after evaporating the solvent and this article can then by pyrolyzed and sintered.Components subject to severe mechanical, thermal and corrosive stress can be produced from the ceramic obtained.