Abstract
Glass microspheres with yttria-alumina eutectic composition (76.8 mol% Al2O3 and 23.2 mol% Y2O3) were prepared by sol-gel Pechini method and flame synthesis with or without subsequent milling. Prepared amorphous powders were studied by X-ray powder diffraction (XRD), particle size analysis (PSA), scanning electron microscopy (SEM) and differential thermal analysis (DTA). Hot pressing (HP), rapid hot pressing (RHP) and spark plasma sintering (SPS) were used to sinter amorphous precursor powders at 1600 °C without holding time (0 min). The preparation process including milling step resulted in amorphous powders with narrower particle size distribution and smaller particle size. All applied pressure assisted sintering techniques resulted in dense bulk samples with fine grained microstructure consisting of irregular α-Al2O3 and Y3Al5O12 (YAG) grains. Milling was beneficial in terms of final microstructure refinement and mechanical properties of sintered materials. A material with the Vickers hardness of HV = (17.1 ± 0.3) GPa and indentation fracture resistance of (4.2 ± 0.2) MPa.m1/2 was prepared from the powder milled for 12 h.
Article note:
A collection of invited papers based on presentations at the 14th International Conference on Solid State Chemistry (SSC 2021) held in Trencin, Slovakia, June 13–17, 2021.
Funding source: Agentúra na Podporu Výskumu a Vývoja
Award Identifier / Grant number: 17-0049, 19-0010
Funding source: Vedecká Grantová Agentúra MŠVVaŠ SR a SAV
Award Identifier / Grant number: 1/0527/18, 2/0026/17
Acknowledgment
This paper is a part of dissemination activities of project FunGlass. This project has received funding from the European Union’s Horizon 2020, research and innovation programme under grant agreement No 739566. The financial support of this work by the projects APVV-17-0049, APVV-19-0010, VEGA 2/0026/17 and VEGA 1/0527/18 is gratefully acknowledged. We also thank the support from the project Centre for Functional and Surface Functionalized Glass (CEGLASS), ITMS code is 313011R453, operational program Research and innovation, co-funded from European Regional Development Fund.
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Research funding: This work was funded by Agentúra na Podporu Výskumu a Vývoja (17-0049, 19-0010) and Vedecká Grantová Agentúra MŠVVaŠ SR a SAV (1/0527/18, 2/0026/17).
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