Processing route dramatically influencing the nanostructure of carbon-rich SiCN and SiBCN polymer-derived ceramics. Part I: Low temperature thermal transformation
Processing route dramatically influencing the nanostructure of carbon-rich SiCN and SiBCN polymer-derived ceramics. Part I: Low temperature thermal transformation
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DOI：
10.1016/j.jeurceramsoc.2011.09.012
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发表时间：
2012-07-01
影响因子：
5.7
通讯作者：
Riedel, Ralf
中科院分区：
文献类型：
--
作者：
Gao, Yan;Mera, Gabriela;Riedel, Ralf
在这项研究中，报道了工艺路线对富碳SiCN和SiBCN聚合物衍生陶瓷纳米结构评价的显著影响。首次将聚苯基乙烯基硅基碳化二亚胺和聚苯基硅基碳化二亚胺温压成型，成功制备了块体富碳SiCN和SiBCN陶瓷。在所开发的纳米结构方面，将大块样品与其类似的粉末样品进行了比较。选择了1100℃和1400℃的典型温度，以考察加工路线对这些样品结晶行为的影响。由于聚合物衍生陶瓷(PDC)的固态结构对前驱体的分子结构高度敏感，在聚合物向陶瓷转化和分解的过程中，加工路线和热解温度的变化可以改变PDC的纳米结构。结果表明，与粉末类似物相比，块体富碳SiCN和SiBCN陶瓷具有更好的抗结晶热稳定性。(C)2011爱思唯尔有限公司。保留所有权利。
In this study, the significant effect of the processing route on the nanostructure evaluation of carbon-rich SiCN and SiBCN polymer-derived ceramics is reported. For the first time, bulk carbon-rich SiCN and SiBCN ceramics are successfully produced by warm pressing of polyphenylvinylsilyl-carbodiimide and polyborophenylsilylcarbodiimide. The bulk samples were compared with their analogous powder samples with respect to the developed nanostructure. Representative temperatures of 1100 and 1400 degrees C were chosen in order to investigate the effect of processing route used on the crystallization behavior of those samples. As the solid-state structure of polymer-derived ceramics (PDCs) is highly sensitive to the molecular structure of the precursor, the variation of processing route and pyrolysis temperature during the polymer to ceramic transformation and decomposition enables to alter the nanostructure of PDCs. It was found that the bulk carbon-rich SiCN and SiBCN ceramics show an improved thermal stability against crystallization as compared to their powder analogues. (C) 2011 Elsevier Ltd. All rights reserved.