Processing, crystallization and characterization of polymer derived nano-crystalline Si-B-C-N ceramics
Processing, crystallization and characterization of polymer derived nano-crystalline Si-B-C-N ceramics
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DOI：
10.1007/s10853-006-0934-6
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发表时间：
2006-11-01
影响因子：
4.5
通讯作者：
Aldinger, F.
中科院分区：
文献类型：
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作者：
Kumar, Ravi;Cai, Y.;Aldinger, F.
以硼改性聚（乙烯）硅氮烷为原料合成了Si-B-C-N陶瓷，化学式为(B[C2H4-Si(CH3)NH](3))(n)。原始非晶态材料在1800 ~ 1900℃的温度下结晶，晶粒尺寸明显小于100 nm。热处理的几个参数，包括温度、保温时间和气氛，都会影响得到的纳米结构。通过x射线衍射（XRD）、透射电子显微镜（TEM）、电子能谱成像（ESI）和光谱化学分析等手段对其化学和物相组成进行了研究，以了解控制结晶行为的机理。采用不同粒径的前驱体聚合物制备陶瓷样品，以量化不同比表面对结晶行为的影响。
Si-B-C-N ceramics were synthesized from boron modified poly( vinyl) silazanes with the chemical formula (B[C2H4-Si(CH3)NH](3))(n). The originally amorphous materials are crystallized at temperatures in the order of 1,800-1,900 degrees C, which results microstructures with grain sizes significantly below 100 nm. Several parameters of the heat treatment, including temperature, holding time and atmosphere, affect the resulting nanostructures. This and the chemical and phase composition were studied via X-ray diffraction (XRD), transmission electron microscopy (TEM), electron spectroscopic imaging (ESI) and spectrochemical analysis in order to gain an understanding of the mechanisms, which control the crystallization behavior. Ceramic samples were also produced using different particle sizes of the precursor polymer in order to quantify the effect of the varying specific surface on the crystallization behavior.