Synthesis of Polyceriborosilazane via Substitution and Polymerization and Pyrolysis to SiBCN(Ce) Ceramics
The introduction of metal atoms into the molecular network of polymer precursors allows the formation of polymer-derived ceramics with multi-element network which is attractive to the development of high temperature ceramics and functional materials.In this work,rare-earth metal-cerium (Ce) is introduced into polyborosilazane (PBSZ) through the substitution and polymerization reactions and a novel molecular precursor of polyceriborosilazane (PCeBSZ) is synthesized.The synthesis of PCeBSZ starts from PBSZ through lithium substitution with BuLi followed by Ce replacement using CeCl3 as the precursor.The chemical structure of the PBSZ and the Li containing PBSZ intermediate are characterized and analyzed by Fourier transform infrared spectroscopy.SiBCN ceramics containing Ce (SiBCNCe) are formed by pyrolysis of the PCeBSZ precursor in argon flow at 1100 ℃ for 2 h.X-ray photoelectron spectroscopic analysis of the ceramics reveals the ceramic has multi-components consisting of Ce,Si,B,C and N.Scanning electron microscope observation shows the presence of dense phase in the ceramics and micro pores on the surface.
SiBCNCe ceramics polymer-derived ceramics high temperature ceramic substitution and polymerization reactions
Si-Hui Wang He-Yun Wang Fan-Xing Meng Ya-Li Li
Key Laboratory of Advanced Ceramics and Machining Technology Ministry of Education,School of Materials Science and Engineering,Tianjin University,Tianjin 300072 P.R.China
国际会议
The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))
厦门
英文
894-897
2011-11-04（万方平台首次上网日期，不代表论文的发表时间）