High-temperature phase and microstructure evolution of polymer-derived SiZrCN and SiZrBCN ceramic nanocomposites
发布时间：2021-09-04
点击次数：
影响因子：3.78
发表刊物：Journal of the American Ceramic Society
摘要：A zirconium and a zirconium/boron containing single-source precursor were synthesized via chemical modification of a commercially available polysilazane (Durazane 1800) with tetrakis (dimethylamido) zirconium (IV) (TDMAZ) as well as with both TDMAZ and borane dimethyl sulfide complex, respectively. The polymer-to-ceramic transformation of the precursors into SiZrCN and SiZrBCN ceramics as well as the thermal evolution of their phase composition and microstructure was studied. The pyrolysis of the precursors led to the formation of amorphous SiZrCN and SiZrBCN ceramics. Interestingly, the as prepared SiZrBCN ceramic was single-phasic and fully featureless; whereas SiZrCN exhibited the presence of nano-sized ZrO2 particles; however, only very localized in close proximity to internal surfaces. Heat treatment at higher temperatures induced crystallization processes in both prepared ceramics. Thus, at temperatures beyond 1500°C, cubic ZrCxNy, β-Si3N4 as well as β-SiC were generated. It was shown that the incorporation of B into SiZrCN suppressed the crystallization of ZrCxNy and, in addition, impeded the reaction of SiNx with C, resulting in an improved thermal stability of SiZrBCN compared to SiZrCN ceramic. Moreover boron was shown to be mainly located in the sp2-hybridized “free” carbon present in SiZrBCN, forming a turbostratic BCN phase which has been unequivocally detected by means of high-resolution transmission electron microscopy (HRTEM) and energy-dispersive X-ray spectroscopy (EDS).
合写作者：Johannes Peter, Claudia Fasel, Qingbo Wen, Yue Zhang, Hans‐Joachim Kleebe
第一作者：Bo Feng
论文类型：期刊论文
通讯作者：Emanuel Ionescu
文献类型：J
卷号：103
期号：12
页面范围：7001-7013
是否译文：否
发表时间：2020-12-01
收录刊物：SCI
发布期刊链接：https://ceramics.onlinelibrary.wiley.com/doi/10.1111/jace.17149