Papers by Author: Oleg Vasylkiv

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Authors: Oleg Vasylkiv, Yoshio Sakka, Valeriy Skorokhod
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Authors: Oleg Vasylkiv, Yoshio Sakka, Valeriy Skorokhod
Abstract: The 0.75 to 3 mol% Y2O3-stabilized tetragonal ZrO2 and Al2O3/Y-TZP nano-composite ceramics with 0.2 to 0.7 wt% of alumina were produced by a colloidal technique and low-temperature sintering. The influence of the resulting density, microstructure, the yttria-stabilizer and the alumina content on toughness was determined. The bulk 2.7Y-TZP ceramic with an average grain size of 110 nm reached fracture toughness of 11.2 MPa·m1/2. A nano-grained alumina/zirconia composite with an average grain size of 92 nm was obtained. Y-TZP ceramics with a reduced yttria-stabilizer content were shown to reach fracture toughness of 13.8 MPa·m1/2 (2Y-TZP), and 14.5 MPa·m1/2 (1.5Y-TZP). Y-TZP/alumina composites with 0.35 wt% of Al2O3 were shown to reach fracture toughness of 15.7 MPa·m1/2 (2Y), 15.3 MPa·m1/2 (1.5Y).
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Authors: Oleg Vasylkiv, Yoshio Sakka, Valeriy Skorokhod
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Authors: Oleg Vasylkiv, Yoshio Sakka, Y. Maeda, Valeriy Skorokhod
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Authors: A. Ragulya, Valeriy Skorokhod, Oleg Vasylkiv
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Authors: Oleg Vasylkiv, Yoshio Sakka, Valeriy Skorokhod
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Authors: Oleg Vasylkiv, Yoshio Sakka, Valeriy Skorokhod
Abstract: We demonstrate the methodology of engineering the multi-component ceramic nanopowder with precise morphology by ‘nano-blast’ calcinations decomposition of preliminary engineered nanoreactors. Multiple explosions of just melted C3H6N6O6 embedded into preliminary engineered nanoreactors break apart the agglomerates due to the highly energetic impacts of the blast waves. Also, the solid-solubility of one component into the other is enhanced by the extremely high local temperature generated during each nano-explosion in surrounding area. This methodology was applied for production of agglomerate-free nanoaggregates of Gd20Ce80O1.95 with an average size of 42 nm and LaSrGaMgO3-x nanopowder with an average aggregate size of 83 nm.
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