Journal: Open Ceramics

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Elsevier

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2020 - 20253
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Publications 1 - 3 of 3
  • High-resolution tomographic analysis of microstructure and porosity in mock-ups of ancient-inspired mosaics
    Item type: Journal Article
    Stucchi , Neva M.E.; Iori, Gianluca; Hans , Philipp; et al. (2025)
    Open Ceramics
    This research investigates the use of Synchrotron X-ray Computed Tomography (SXCT) to study Roman mosaic mock-ups, focusing on the three-dimensional distribution of material density, cracks, and stress-strain interactions across layers. Three samples were analysed: one of stone tesserae and two of glass tesserae. High-resolution SXCT scans, using polychromatic radiation at X-ray energies above 70 keV, enabled non-invasive, microscale examination of cracks and assessment of how composition influences crack development at interfaces. Digital reconstruction and phase contrast analysis distinguished cracks from pores, revealing microstructural features and enabling quantification of pore volumes and porosity variations within strata. The results showed that stone tesserae induced more extensive cracking in the Supra Nucleus stratum than glass tesserae. These findings enhance understanding of internal microstructure and stress behaviour in mosaics, providing a basis for developing appropriate conservation strategies. Quantifying fracture dimensions enables conservators to determine the optimal viscosity and formulation of consolidants for effective penetration and stabilization, while insights on compaction and tesserae surface quality inform the design of re-adhesion and cleaning protocols that enhance cohesion and minimize future detachment. Together, these results show how microscale analysis can guide material selection and treatment strategies, ultimately supporting more durable repairs and the long-term preservation of mosaics.
  • Selective laser melting of thermal pre-treated metal oxide doped aluminum oxide granules
    Item type: Journal Article
    Pfeiffer, Stefan; Makowska, Malgorzata; Florio, Kevin; et al. (2020)
    Open Ceramics
    The influence of powder bed density on the final density and microstructure of aluminum oxide parts manufactured by direct selective laser melting has been studied. Iron oxide and manganese oxide nanoparticles were used to improve laser absorption by over eighty percent. To achieve such values, flowable doped alumina granules were prepared by spray drying. Thermal treatment of the granules at 1600 °C and consecutive mixing with coarse alumina allowed improvement of the tapped powder densities, reaching a maximum value of 56.4% of the theoretical density. This led to laser processed parts with densities up to 98.6% measured by tomographic microscopy. Measurements with an integrating sphere and an UV-VIS-NIR spectrophotometer employing Kubelka-Munk theory show the decrease of absorptance caused by thermal pre-treatment. 3D mapping by X-ray μ-beam fluorescence contrast tomography and high resolution synchrotron powder diffraction provide information about the variation of dopant distribution and composition within the granules.
  • Transparent materials with stiff and tough hierarchical structures
    Item type: Journal Article
    Magrini, Tommaso; Bouville, Florian; Studart, André R. (2021)
    Open Ceramics
Publications 1 - 3 of 3