Acta Chimica Sinica ›› 2009, Vol. 67 ›› Issue (11): 1205-1210. Previous Articles     Next Articles

Original Articles


许 峰*,a 胡小方a 赵建华a 袁清习b


  1. (a中国科学技术大学 中国科学院材料力学行为和设计重点实验室 合肥 230026)
    (b中国科学院高能物理研究所 北京 100039)

  • 投稿日期:2008-11-27 修回日期:2008-12-29 发布日期:2009-06-14
  • 通讯作者: 许峰

In Situ Observation of the Microstructure-evolution in Silicon Nitride Ceramics Sintering by Synchrotron Radiation X-ray Computed Tomography

Xu, Feng *,a Hu, Xiaofang a Zhao, Jianhua a Yuan, Qingxi b


  1. (a Key Laboratory of Mechanical Behavior and Design of Materials, Chinese Academy of Sciences,
    University of Science and Technology of China, Hefei 230026)
    (b Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039)
  • Received:2008-11-27 Revised:2008-12-29 Published:2009-06-14
  • Contact: XU Feng

Microstructure-evolution of the silicon nitride ceramics sample during sintering process was investigated by a synchrotron radiation X-ray computed tomography (SR-CT) technique. The projection images of the sample were obtained during the sintering process in real-time. 2-D and 3-D reconstructed images were obtained by treating the projection images of different sintering periods with filter back projection arithmetic and digital image processing methods. From the reconstructed images, three sintering stages of the silicon nitride ceramic sample were clearly distinguished and several sintering phenomena during the sintering process such as grain contact, sintering neck growth and pore spheroidization were observed. Densification rate of sintering process was analyzed from the porosity-time logarithm curve, which was obtained from the reconstructed images of silicon nitride ceramic sample at different sintering time. The three sintering stages and linear relationship between porosity and time logarithm in the middle stage of sintering which has already been described in the traditional sintering theories were clearly observed from the porosity-time logarithm curve. The experiment results are in concordance with the sintering theory and provide effective experimental data for further analysis of the sintering process and the mechanical characteristics of ceramics.

Key words: analysis and testing technology of materials, sintering, synchrotron radiation X-ray computed tomography, silicon nitride ceramic, microstructure evolution