共 30 条
Thermal stability of polymer derived SiBNC ceramics
被引:44
作者:
Tang, Yun
[1
]
Wang, Jun
[1
]
Li, Xiaodong
[1
]
Li, Wenhua
[1
]
Wang, Hao
[1
]
Wang, Xiaozhou
[1
]
机构:
[1] Natl Univ Def Technol, State Key Lab Adv Ceram Fibers & Composite, Changsha 410073, Hunan, Peoples R China
基金:
国家高技术研究发展计划(863计划);
关键词:
Calcination;
X-ray methods;
Thermal properties;
Si-B-N-C ceramics;
HIGH-TEMPERATURE STABILITY;
SINGLE-SOURCE PRECURSOR;
BORON CONTENT;
BEHAVIOR;
CARBON;
POLYSILAZANE;
FIBERS;
D O I:
10.1016/j.ceramint.2009.03.043
中图分类号:
TQ174 [陶瓷工业];
TB3 [工程材料学];
学科分类号:
0805 ;
080502 ;
摘要:
To study the thermal stability of polymer derived SiBNC ceramics, a polyborosilazane was pyrolyzed in N-2 and NH3/N-2 atmosphere, respectively. The as-pyrolyzed products were annealed in N-2 atmosphere at 1200-1850 degrees C for 2 h. The chemical composition and phase structure of the as-pyrolyzed and annealed ceramics were investigated by element analysis, XRD and FT-IR. The results show that all the ceramics exhibit excellent high temperature stability. They are fully amorphous to 1700 degrees C, and only partial crystallization, giving a mixture Of Si3N4, BN and SiC phases, is observed upon heating at 1850 degrees C. The N-2 pyrolyzed products show better stability than the NH3/N-2 pyrolyzed products and have less tendency to crystalline at higher temperatures. Better retention of nitrogen at high temperatures is also observed for the N-2 pyrolyzed products. (C) 2009 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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页码:2871 / 2876
页数:6
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