宇航材料工艺2018，Vol.48Issue(1)：44-48,5.DOI:10.12044/j.issn.1007-2330.2018.01.008
SiBCN陶瓷前驱体热解机理研究
Study of Pyrolysis Mechanism of SiBCN Polymer Precursor
许艺芬 1胡继东 1陶孟 1王晓叶 1冯志海1
作者信息
- 1. 航天材料及工艺研究所,先进功能复合材料技术重点实验室,北京100076
- 折叠
摘要
Abstract
The pyrolysis mechanisms occurring during the conversion of polyborosilazane (PBSZ) into amorphous SiBCN ceramics have been investigated.TGA has been applied to investigate the mass loss behaviour during ceramization.Solid-state 11B,13C and 29Si NMR spectroscopy has been applied to probe the local environment of all NMR active nuclei in the precursor,the thermolysis intermediates and the ceramic residue.IR spectroscopy has been performed to receive valuable information on the chemical bonding in all materials.At temperature below 400 ℃,NH3and H2 are released via transamination and dehydrocoupling reaction involving N—H and Si—H units.It is followed by evolution of hydrocarbons due to the cleavage of bonds and formation of methane and hydrogen.Ceramization continues at temperature above 800 ℃.After heating to 1000 ℃,ceramization complete and free carbon,BN3 domains as well as Si—C—N units coexist (SiCx N4-x,x =0,1,2,3).关键词
SIBCN前驱体/固体NMR/FTIR/热解机理Key words
SiBCN polymer precursor/NMR/FTIR/Pyrolysis mechanism分类
通用工业技术引用本文复制引用
许艺芬,胡继东,陶孟,王晓叶,冯志海..SiBCN陶瓷前驱体热解机理研究[J].宇航材料工艺,2018,48(1):44-48,5.
