Cracks, Porosity and Microstructure of Ti Modified Polymer-Derived Sioc Revealed by Absorption-, XRD- and XRF-Contrast 2D and 3D Imaging

Abstract

Morphology, phase composition, cracks and porosity are investigated in monolithic Ti modified SiOC polymer-derived ceramics pyrolyzed at 10 0 0 °C and 140 0 °C using synchrotron X-ray full field absorptioncontrast tomographic microscopy and scanning XRF-and XRD-contrast microscopy. Samples pyrolyzed at 10 0 0 °C show a crack-free structure, but pyrolysis at 1400 °C results in formation of cracks and at higher Ti content also shows porosity. Tomography revealed the formation of a layered morphology that varies in terms of crystallographic structure and/or Ti stoichiometric concentration. The microstructural observations and electrical conductivity are discussed in terms of pyrolysis temperature and Ti content.