X-ray micro-computed tomography of beech wood and biomorphic C, SiC and Al/SiC composites

Abstract

The microstructures of beech wood and of beech wood-derived carbon, silicon carbide (SiC), and an aluminum/SiC composite were studied using both scanning electron microscopy (SEM) and synchrotron X-ray microcomputed tomography (mCT). As opposed to traditional two-dimensional imaging techniques, the mCT data allowed nondestructive evaluation of relatively large sample volumes. Nondestructive three-dimensional data analysis led to the observation of microstructural features, such as varying pore-wall topographies not previously seen in SEM, calculations of the volume fraction of porosity and characterization of the interconnectivity of porosity in the SiC material.

3D analysis of anatomical reactions in conifers after mechanical wounding: first qualitative insights from X-ray computed tomography

“…X-ray computed tomography (XRCT) was first developed in medicine (Oldendorf 1961;Cormack 1963) as it provides an accurate spatial distribution of the inner structure of objects (Duliu 1999). The potential of XRCT was rapidly recognized by non-medical sciences including dendrology (Lindgren et al 1992;Wilkes et al 2009) to determine the spatial distribution of internal structures and to facilitate pre-cutting decisions using artificial neural networks or maximum likelihood classifier (Sarigul et al 2003;Wei et al 2009). In dendrochronology, CT has been used primarily to measure the tree-ring widths in fragile, archeological objects (Bill et al 2012).…”

Image reconstruction from sparse data in synchrotron-radiation-based microtomography

“…1 Today, both commercial micro-CT systems and synchrotronradiation-based CT systems can achieve around 1-μm resolution without x-ray optics, [2][3][4][5][6] and sub-50-nm resolution with x-ray optics. [6][7][8][9] In terms of microtomography, a thirdgeneration synchrotron radiation source provides partially coherent x-ray beam with enough brilliance to image a millimeter-sized sample at better than 10/micropixel resolution in a few seconds with high sensitivity.…”

Biomorphic ceramics from wood-derived precursors

“…The large macroporosity, with diameters 10 and larger, remained basically unchanged ( Figure 14). Connectivity between axial pores is also preserved after the infiltration and etching steps, as demonstrated by x-ray micro-computed tomography ( Figure 15) [52].…”

“…Further, they measured their mechanical properties [86] as well as load partitioning among the phases using in-situ diffraction experiments [87] and performed detailed investigations on their microstructure by means of x-ray computed micro tomography [52]. Copper-SiC composites have also been fabricated by electroplating targeting thermal applications by Pappacena et al [88,89].…”