Baldus P, Jansen M, Sporn D
Bayer AG, ZF-MFA, Gebaude Q18, D-51368 Leverkusen, Germany. Max-Planck-Institut fur Festkorperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany. Fraunhofer Institut fur Silicatforschung, Neunerplatz 2, D-97082 Wurz.
Science. 1999 Jul 30;285(5428):699-703. doi: 10.1126/science.285.5428.699.
High-temperature engine applications have been limited by the performance of metal alloys and carbide fiber composites at elevated temperatures. Random inorganic networks composed of silicon, boron, nitrogen, and carbon represent a novel class of ceramics with outstanding durability at elevated temperatures. SiBN(3)C was synthesized by pyrolysis of a preceramic N-methylpolyborosilazane made from the single-source precursor Cl(3)Si-NH-BCl(2). The polymer can be processed to a green fiber by melt-spinning, which then undergoes an intermediate curing step and successive pyrolysis. The ceramic fibers, which are presently produced on a semitechnical scale, combine several desired properties relevant for an application in fiber-reinforced ceramic composites: thermal stability, mechanical strength, high-temperature creep resistivity, low density, and stability against oxidation or molten silicon.
高温发动机应用一直受到金属合金和碳化物纤维复合材料在高温下性能的限制。由硅、硼、氮和碳组成的无规无机网络代表了一类新型陶瓷，在高温下具有出色的耐久性。SiBN(3)C是由单源前驱体Cl(3)Si-NH-BCl(2)制成的陶瓷前驱体N-甲基聚硼硅氮烷热解合成的。该聚合物可通过熔融纺丝加工成绿色纤维，然后经过中间固化步骤和连续热解。目前以半工业规模生产的陶瓷纤维结合了纤维增强陶瓷复合材料应用所需的几种性能：热稳定性、机械强度、高温抗蠕变性、低密度以及抗氧化或抗熔融硅的稳定性。
