SiBN陶瓷纤维的组成结构及高温稳定性研究  

Study on Structure and High Temperature Stability of SiBN Ceramic Fibers

作　　者：常雪峰[1] 崔永杰[1] 彭帅[1] 张晨宇[1] 韩克清[1] 刘勇[1] 余木火[1] CHANG Xuefeng;CUI Yongjie;PENG Shuai;ZHANG Chenyu;HAN Keqing;LIU Yong;YU Muhuo(State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai 201620, China)

机构地区：[1]东华大学材料科学与工程学院纤维材料改性国家重点实验室,上海201620

出　　处：《材料开发与应用》2018年第2期51-56,共6页Development and Application of Materials

基　　金：上海市科委重点项目(14JC1400100)

摘　　要：以三氯化硼(BCl_3)、三氯硅烷(Si HCl_3)、六甲基二硅氮烷(Me_6Si_2NH)为原料,通过共缩聚一步法制备了小分子前驱体,然后经过聚合得到聚硼硅氮烷前驱体(PBSZ),后经熔融纺丝、不熔化处理、高温热解制备出硅硼氮(Si BN)陶瓷纤维。利用FT-IR、NMR、TG、XRD及TEM等分析手段对Si BN陶瓷纤维的组成结构及高温稳定性能进行了表征。研究表明,热解后的Si BN陶瓷纤维主要包括Si N_4及BN_3结构,其中B—N以六元环形式存在,基本实现了无机化转变,在850℃时失重约为1%,在1 400℃仍然保持非晶结构,具有较好的高温稳定性。The molecular precursors were synthesized with boron trichloride（BCl3）,trichlorosilane（Si HCl3）and hexamethldisilazane（Me6Si2NH）as raw materials by one-step copoly condensation,and then polymerized to polyborosilazane（PBSZ）,and Si BN ceramic fibers were finally obtained after spinning,curing and pyrolysis of PBSZ.The structure and high temperature stability of Si BN ceramic fibers were investigated by a series of characterization methods such as FT-IR,NMR,TG,XRD,TEM,etc.The results showed that there were mainly Si N4 and B—N hexatomic rings after Si BN ceramic fibers pyrolysized,indicating the existance of inorganic transfermation.The Si BN ceramic fiber lost 1%of weight at 850℃ and remained amorphous structure at 1 400℃,presenting the excellent high temperature stability.

关 键 词：聚硼硅氮烷 SiBN陶瓷纤维 热解 高温稳定性 

分 类 号：TQ343.7[化学工程—化纤工业]