Preparation and Characterization of Continuous Silicon Oxycarbide Ceramic Fibers

以聚甲基倍半硅氧烷（Polymethylsilsesquioxane，PMSQ）为先驱体，采用熔融纺丝法制备原丝，然后经过化学交联使其固化，最后在惰性气氛中进行高温热解，成功制备了硅氧碳(Siliconoxycarbide，SiOC）陶瓷纤维。采用29Si-NMR、XRD、FT-IR、SEM、RMS、TG-DSC等表征技术系统地研究了在交联以及高温热解过程中纤维的化学组成、相组成和微观组织的演变规律，并对SiOC陶瓷纤维的拉伸强度、密度以及性介电性能进行了测试。 PMSQ具有良好的熔融纺丝性能，通过化学方法交联固化，交联后纤维的凝胶含量为88.1%。经850°C热解后得到SiOC陶瓷纤维，陶...Silicon oxycarbide (SiOC) ceramic fibers are made by melt spinning, chemical curing and pyrolysis in inert atmosphere using PMSQ as the ceramic precursor. GPC, FT-IR, NMR, RMS, XRD, SEM, TG-DSC and elements analysis were performed on as-spun, cured and pyrolyzed fibers. Tensile strength, density and reflection loss were measured. PMSQ is readily spinnable. The as-spun fibers can be cured using am...学位：工学硕士院系专业：材料学院_工程硕士(材料工程)学号：2072014115013