文献类型：期刊文献

中文题名：前驱体转化法制备SiAlCN纳米多孔陶瓷

英文题名：Preparation of SiAlCN Nanoporous Ceramics by Preceramic Polymer Pyrolysis

作者：李耀[1];郭康康[1];朱亚平[1];王帆[1];齐会民[1]

机构：[1]特种功能高分子材料及相关技术教育部重点实验室华东理工大学材料科学与工程学院,上海200237

年份：2018

卷号：36

期号：5

起止页码：834

中文期刊名：材料科学与工程学报

外文期刊名：Journal of Materials Science and Engineering

收录：CSTPCD;;北大核心:【北大核心2017】；CSCD:【CSCD2017_2018】；

基金：国家自然科学基金资助项目(90816021)

语种：中文

中文关键词：溶胶凝胶法;聚铝硅氮烷;前驱体凝胶;纳米多孔陶瓷

外文关键词：sol-gel method;polyaluminasilazane;precursor gel;nanoporous ceramics

摘要：以异丙醇铝改性聚硅氮烷合成的聚铝硅氮烷(PASZ)作为前驱体,六亚甲基二异氰酸酯(HDI)为交联剂,通过溶胶凝胶法在极稀溶液(80wt%)中形成聚铝硅氮烷前驱体凝胶,经过干燥、裂解陶瓷化制备SiAlCN纳米多孔陶瓷。傅里叶变换红外光谱(FTIR)结果表明凝胶体系主要通过-NCO和Si-N键的反应以及乙烯基聚合反应进行交联。用TGA对裂解过程进行研究,结果表明HDI在650℃前完全裂解脱除,该温度下基本完成陶瓷化。用SEM研究了凝胶及陶瓷产物的孔形貌,发现多孔前驱体凝胶的孔结构在陶瓷化转变过程中有一定的收缩。在1400℃时SiAlCN多孔陶瓷中析出莫来石晶粒,生成了更多的介孔结构,具有良好的抗氧化性。
Polyaluminasilazane（PASZ） was firstly synthesized by a reaction of polysilazane with aluminum isopropoxide with hexamethylene diisocyanate（HDI） as crosslinking agent. Sol-gel method was then adopted to make PASZ gels by dissolving it in diluted solution（80%）. SiAlCN nanoporous ceramics was finally prepared by drying and pyrolysis of the gels. Characterizations conducted for all intermediate and final samples show the following： The vinyl polymerization and reaction between-NCO and Si-N bonds were involved in cross-linking reactions; HDI were completely removed by pyrolysis before 650℃, and the ceramization process was completed at this temperature; The precursor gels and ceramic products were all porous, and that pores in gel shrinked during ceramization process. After pyrolysis at 1400℃ mullite phase was precipitated in the SiAlCN ceramic system which led to more mesoporous structures. The SiAlCN nanoporous ceramics exhibited good oxidation resistance.