3D characterization of the SiC nanoparticle distribution in ZrB2-SiC ceramics with synchrotron X-ray nanoscale computed tomography

Evaluating the dispersion of SiC nanoparticles is significant for the development of ZrB2-SiC nanocomposite ceramics. This paper reports the 3D distribution characterization of the nanosized SiC additives in ZrB2-SiC ceramics with synchrotron X-ray nanoscale computed tomography (nano-CT) and Morisita indexes. Different from the investigation with electron microscopy, the presented work implements nondestructively 3D visualization and quantitative characterization of the SiC nanoparticles distribution in ZrB2-SiC ceramics. Firstly, a ZrB2-SiC ceramic sample with a size less than 60 mu m was prepared. Then, a nano-CT experiment was designed and implemented for this sample at the 4W1A beamline of Beijing Synchrotron Radiation Facility (BSRF). Next, SiC nanoparticles were extracted by applying image segmentation to the generated 3D nano-CT images of this sample and visualized by volume rendering. Finally, Morisita index was extended from 2D to 3D and applied to the corresponding nano-CT images for the quantitative characterization of SiC nanoparticle 3D distribution. The results from the Morisita index are in good agreement with the visual observation. They reveal that SiC agglomerates exist in the ZrB2 matrix and vary over the regions of interest in the investigated sample.

Automated summary

This paper reports on the 3D distribution characterization of nanosized SiC additives in ZrB2-SiC ceramics using synchrotron X-ray nano-CT technology and Morisita indexes. The study reveals the presence of SiC agglomerates in the ZrB2 matrix and variations in different regions of interest within the sample, as confirmed by the Morisita index.