CAJ | 학술논문

在空气气氛中采用γ射线辐照处理聚碳硅烷(PCS)先驱丝,辐照先驱丝经 Ar中热交联、NH3中热解氨化、N2中高温氮化处理制备了氮化硅陶瓷纤维。研究了热交联处理对辐照先驱丝化学结构、凝胶含量、氨化陶瓷产率、抗拉强度、微观形貌及氧含量的影响。结果表明：热交联处理生成了 Si—CH2—Si 和 Si—O—Si 桥连结构,桥连结构使PCS先驱丝实现凝胶化；热交联处理不仅大幅提高了辐照 PCS先驱丝的氨化陶瓷产率,还提高了热解所得氮化硅陶瓷纤维的抗拉强度,而且还降低了陶瓷纤维的氧含量；吸收剂量为1.0 MGy的辐照丝经热交联处理后,其热解所得氮化硅陶瓷纤维抗拉强度达2.05 GPa,氧质量分数仅为9.5%。
재공기기분중채용γ사선복조처리취탄규완(PCS)선구사,복조선구사경 Ar중열교련、NH3중열해안화、N2중고온담화처리제비료담화규도자섬유。연구료열교련처리대복조선구사화학결구、응효함량、안화도자산솔、항랍강도、미관형모급양함량적영향。결과표명：열교련처리생성료 Si—CH2—Si 화 Si—O—Si 교련결구,교련결구사PCS선구사실현응효화；열교련처리불부대폭제고료복조 PCS선구사적안화도자산솔,환제고료열해소득담화규도자섬유적항랍강도,이차환강저료도자섬유적양함량；흡수제량위1.0 MGy적복조사경열교련처리후,기열해소득담화규도자섬유항랍강도체2.05 GPa,양질량분수부위9.5%。
Polycarbosilane (PCS)precursor fibers were irradiated byγ-ray in air.Silicon nitride ceramic fibers were obtained from the irradiated PCS fibers by process of thermal cross-linking treatment in Ar,ammoniation pyrolysis in NH3 and high temperature nitriding treatment in N2 .The effects of thermal cross-linking treatment on chemical structure,gel content,ammoniation ceramic yield,tensile strength,microstructure and oxygen content were studied.The results show that bridge structures of Si—CH2—Si and Si—O—Si are formed in the PCS fibers by thermal cross-linking treatment and make the PCS fibers become gelling.The ammoniation ceramic yield of the irradiated PCS fibers increases sharply after thermal cross-linking treatment.The tensile strength of the silicon nitride ceramic fibers increases sharply, while the oxygen content decreases. After thermal cross-linking treatment,the tensile strength of the silicon nitride ceramic fibers derived from the PCS fibers with absorbed dose of 1.0 MGy reaches 2.05 GPa and the oxygen mass fraction is 9.5%.