Thermal stability of polymer derived SiBNC ceramics
Thermal stability of polymer derived SiBNC ceramics
复制标题
聚合物衍生的 SiBNC 陶瓷的热稳定性
DOI：
10.1016/j.ceramint.2009.03.043
复制
发表时间：
2009-09-01
影响因子：
5.2
通讯作者：
Wang, Xiaozhou
中科院分区：
文献类型：
--
作者：
Tang, Yun;Wang, Jun;Wang, Xiaozhou
为了研究聚合物衍生SiBNC陶瓷的热稳定性，分别在N2和NH3/N2气氛中热解了一种聚硼硅氮烷。将热解产物在1200-1850 ℃下在N-2气氛中退火2小时。采用元素分析、XRD和FT-IR等手段对样品的化学组成和相结构进行了分析，结果表明，样品均具有良好的高温稳定性。它们在1700 ℃时完全无定形，在1850 ℃加热时仅观察到部分结晶，得到Si 3 N4、BN和SiC相的混合物。N-2热解产物显示出比NH3/N-2热解产物更好的稳定性，并且在较高温度下具有较小的结晶倾向。对于N-2热解产物，还观察到在高温下氮的更好保留。(C)2009 Elsevier Ltd和Techna Group S.r.l. All rights reserved.
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.