[Mao, Weiguo] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410114, Peoples R China.
通讯机构：
[Qingsong Ma; Weiguo Mao] S
School of Materials Science and Engineering, Xiangtan University, Xiangtan, 411105, PR China<&wdkj&>College of Materials Science and Engineering, Changsha University of Science & Technology, Changsha, 410114, PR China<&wdkj&>Science and Technology on Advanced Ceramic Fibers &Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, 410073, PR China
语种：
英文
关键词：
Precursor-derived ceramics;SiHfOC ceramics;Pyrolysis behavior;High temperature structural evolution
National Natural Science Foundation of China [11772287]; Key Laboratory of National Defense Science and Technology [WDZC20195500501]; Science Foundation of the National Key Laboratory of Science and Technology Advanced Composites in Special Environments [6142905202109]
机构署名：
本校为其他机构
院系归属：
材料科学与工程学院
摘要：
SiHfOC ceramics with different Hf contents were prepared by the sol-gel method using polymethylsilsesquioxane and HfOCl2·8H2O as the raw materials. The high-temperature structural evolution of the SiHfOC ceramics with different Hf contents was investigated under an inert atmosphere. The results showed that Hf existed in the free state in the SiHfOC precursors with Hf:Si atomic ratios of 0.05 and 0.1. When the Hf:Si ratio was increased to 0.2, Hf was bridged in the SiOC network to form Si–O–Hf bonds, which changed the pyrolysis behavior of th...
