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碳化硼固相烧结微观结构演化的同步辐射CT观测

期刊名称：无机材料学报
时间：0
页码：175-181
语言：中文
分类：O766[理学—晶体学]
作者机构：[1]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, [2]中国科学院高能物理研究所,北京100039
相关基金：基金项目：国家自然科学基金重点项目（10732080）;北京同步辐射实验室（BSRF）基金致谢：在实验过程中,得到了BSRF形貌站朱佩平、黄万霞的帮助和支持,在此表示感谢.
相关项目：微纳尺度实验力学中的传感、测量、识别新方法研究

关键词：陶瓷, 固相烧结, 同步辐射CT, 微结构演化, ceramic, sintering, synchrotron radiation X-ray computed tomography, microstructure evolution

中文摘要：

利用同步辐射CT（SR-CT）技术,在碳化硼陶瓷样品烧结过程中对其进行实时投影成像,并应用滤波反投影算法和数字图像处理技术,得到了样品在整个烧结过程中内部微结构演化的二维和三维重建图像,实现了对陶瓷固相烧结过程实时、无损的观测.通过重建图像清晰观测到了陶瓷样品在烧结三个阶段中颗粒接触、烧结颈形成、晶粒和气孔长大、气孔球化并收缩等烧结现象;统计了样品在不同烧结时刻的孔隙率,得到了孔隙率随烧结时间和烧结时间对数的变化曲线,并根据曲线分析了样品在不同烧结时刻致密化速率的变化,得到了烧结中期孔隙率和时间对数的线性关系.实验结果和现有烧结理论相吻合,并为进一步完善烧结理论以及建立扩散和本构模型提供了有效的实验数据.

英文摘要：

Microstruetures-evolution of the boron carbide ceramic sample during sintering process was investigated by synchrotron radiation X-ray computed tomography （SR-CT） technique. The projection images of the sample were obtained during sintering process in real-time. Two-dimensional and three-dimensional reconstructed images were obtained by treating the projection images of different sintering periods with filter back projection arithmetic and digital image processing method. From the reconstructed images, three sintering stages of the boron carbide ceramic sample were clearly distinguished and several sintering phenomenon 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-sintering time and porosity-time Logarithm curves which were obtained from reconstructed images of boron carbide ceramic sample at different sintering time. Three sintering stages and linear relationship between porosity and time Logarithm in the middle stage of sintering which were described in the traditional sintering theories were clearly observed from the porosity-sintering time and porosity-time Logarithm curves. The experiment results are in concordance with the sintering theory and provide an effective experimental data for analysis the sintering process and the mechanical characteristics of ceramics in further .

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