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首页> 外文期刊>Journal of Materials Research >Crystallization kinetics of Si_3N_4 in Si-B-C-N polymer-derived ceramics
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Crystallization kinetics of Si_3N_4 in Si-B-C-N polymer-derived ceramics

机译：Si-B-C-N聚合物衍生陶瓷中Si_3N_4的结晶动力学

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摘要

To study the crystallization kinetics of β-Si_3N_4 in Si-B-C-N polymer-derived ceramics, the amorphous ceramics with composition SiC_(1.6)N_(1.0)B_(0.4) were synthesized and then isothermally annealed at 1700, 1775 and 1850 ℃. The integrated intensities of β-Si_3N_4 x-ray diffraction (XRD) patterns were used to examine the course of crystallization. The average size of the Si_3N_4 nanocrystallites was analyzed by means of the XRD measurements and energy-filtering transmission electron microscopy. It was realized that the nanocrystallite dimensions change insignificantly within the time period of crystallization; however, they depend significantly on the temperature. Subsequently, the kinetics of the β-Si_3N_4 crystallization was analyzed. Consequently, large activation energy in the range of 11.5 eV was estimated. Moreover, continuous nucleation and diffusion-controlled growth have been concluded as the main mechanisms of the crystallization process. Further analysis points at the crucial role of the nucleation rate in the crystallization kinetics of β-Si_3N_4.
机译：为了研究β-Si_3N_4在Si-B-C-N聚合物衍生的陶瓷中的结晶动力学，合成了成分为SiC_（1.6）N_（1.0）B_（0.4）的非晶陶瓷，然后在1700、1775和1850℃等温退火。 β-Si_3N_4X射线衍射（XRD）图的积分强度用于检查结晶过程。通过XRD测量和能量过滤透射电子显微镜分析了Si_3N_4纳米晶体的平均尺寸。已经认识到，在结晶时间段内，纳米晶体的尺寸变化很小。但是，它们很大程度上取决于温度。随后，分析了β-Si_3N_4结晶的动力学。因此，估计了11.5 eV范围内的大活化能。此外，连续成核和扩散控制生长已被认为是结晶过程的主要机理。进一步的分析指出成核速率在β-Si_3N_4结晶动力学中的关键作用。

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  • 来源
    《Journal of Materials Research》 |2010年第11期|p.2150-2158|共9页
  • 作者

    Amir H. Tavakoli; Peter Gerstel; Jerzy A. Golczewski; Joachim Bill;

  • 作者单位

    Institute for Materials Science, University of Stuttgart and Max Planck Institute for Metals Research,D-70569 Stuttgart, Germany;

    rnInstitute for Materials Science, University of Stuttgart and Max Planck Institute for Metals Research,D-70569 Stuttgart, Germany;

    rnInstitute for Materials Science, University of Stuttgart and Max Planck Institute for Metals Research,D-70569 Stuttgart, Germany;

    rnInstitute for Materials Science, University of Stuttgart and Max Planck Institute for Metals Research,D-70569 Stuttgart, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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