核化学与放射化学Issue(5)：272-276,5.DOI:10.7538/hhx.YX.2014.2014017
γ辐照联合热交联聚碳硅烷先驱丝热解制备高强度氮化硅陶瓷纤维
Preparation of High Strength Silicon Nitride Ceramic Fibers From Polycarbosilane Fibers byγ-Ray Irradiation and Thermal Cross-Linking
摘要
Abstract
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%.关键词
聚碳硅烷/γ射线/辐照/热交联处理/氮化硅陶瓷纤维Key words
polycarbosilane/γ-ray/irradiation/thermal cross-linking treatment/silicon nitride ceramic fibers分类
化学化工引用本文复制引用
黎阳,高家诚,许云书..γ辐照联合热交联聚碳硅烷先驱丝热解制备高强度氮化硅陶瓷纤维[J].核化学与放射化学,2014,(5):272-276,5.基金项目
贵州省教育厅重点实验室资助项目(黔教合KY字[2012]004) （黔教合KY字[2012]004）
