• MATERIALS

    EFFECTS OF MECHANOCHEMICAL TREATMENT OF ThO2 WITH UO3 AND CеO2

    Machines. Technologies. Materials., Vol. 12 (2018), Issue 1, pg(s) 37-40

    The paper presents the effects of the mechanochemical activation of ThO2-UO3 and ThO2-CeO2 mixtures in air and (for ThO2-UO3) in suspension in H2O or CHCl3. Planetary ball mill (Pulverisette 5, Fritch) with stainless steel triboreactors and milling balls from the same materials are used. Milling for 5 h of the ThO2-UO3 mixture does not affect significantly the crystal structure of the ThO2 but leads to amorphization of UO3, sharp decrease of its crystallites size and increase of the ionic character of the U-O bond. Storage of the activated product (2 months at room temperature) or heating (3 h, 165 oC) leads to partial relaxation of the UO3 crystal structure. The X-ray diffraction data does not give proves for formation of ThO2-UO3 solid solution.

    Formation of solid solution Ce0.6Th0.4O2 accompanied with some amount of amorphisized ThO2, is established as a result of co-milling at the same conditions of the mixture ThO2 – CeO2 with a mole ratio 1. XRD-determined lattice parameter (5.4804(9) Å) and crystallites size (14 nm) of the obtained solid solution are in satisfactory agreement with literature data for the same product obtained via wet chemistry route.

  • DOMINANT TECHNOLOGIES IN “INDUSTRY 4.0”

    STUDYING SIDE-EFFECTS OF GAMMA-IRRADIATION PROCESSING OF LEATHER MATERIALS

    Industry 4.0, Vol. 2 (2017), Issue 5, pg(s) 228-231

    The paper describes part of the results of the first year of the IAEA Coordinated Research Project F23032, Contract № 20567 on “Studying Side-Effects of Gamma Irradiation Treatment for Disinfestation of Cultural Heritage Artefacts”. Calf leather, calf suede and pig skin patterns were selected and analyzed by Scanning electron microscopy (SEM), and Thermal gravimetric analysis (TGA) before and after the gamma-irradiation treatment with 5 kGy, 10 kGy and 15 kGy absorbed doses at low dose rate. The irradiation of the leather materials was performed in the gamma-irradiation facility BULGAMMA based on JS-850 60Co type gamma irradiator at Sopharma JSC. No significant changes in the leather morphology and thermal decomposition were observed as a result of the gamma-irradiation treatment. Conclusions on the applicability of gamma-irradiation treatment for preservation of leather items with insecticide and fungicide doses were done.