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    Wyświetlanie 1-3 z 3
    Tytuł:
    Influence on Static Grain Growth and Sinterability of BaO Addition into 8YSZ
    Autorzy:
    Aktas, B.
    Tekeli, S.
    Salman, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1311666.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Je
    81.07.Bc
    81.20.Ev
    Opis:
    In this study, 8 mol.% yttria stabilized cubic zirconia (8YSZ) powders as a matrix material and 0-15 wt% BaO powders as an additive were used in order to determine the effect of BaO addition and amount on the microstructure, sintering and static grain growth properties of the 8YSZ. For these purposes, undoped and BaO-doped 8YSZ specimens were annealed for grain growth at 1400, 1500, and 1600C for 10, 50, and 100 h, respectively. An increase of annealing temperature and holding time resulted in grain growth in all specimens. The grain size of the 8YSZ decreased with the higher level of BaO added. A limited amount of BaO dissolved in 8YSZ, and insoluble BaO reacted with $ZrO_2$ at high sintering temperature and generated the $BaZrO_3$ second sphase compound. Energy dispersive X-ray spectroscopy results showed that the $BaZrO_3$ second phase segregated at the surrounding grains and grain boundaries of the 8YSZ. These $BaZrO_3$ second phases had a pinning effect at the grain boundaries and prevented the migration of the grain boundaries of the 8YSZ. In conclusion, the grain growth results showed that the grain growth in the BaO-doped 8YSZ specimens was controlled by a solid solution drag mechanism.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 652-655
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical Conductivity of Boron Oxide-Doped Yttria-Stabilized Cubic Zirconia (8YSZ)
    Autorzy:
    Aktas, B.
    Tekeli, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401428.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Je
    81.20.Ev
    82.47.Ed
    Opis:
    The effect of B₂O₃ addition on the electrical conductivity of 8 mol% yttria-stabilized cubic zirconia (8YSZ) was investigated by analyzing the impedance spectra of 0-10 wt.% B₂O₃-doped 8YSZ powders prepared via a colloidal process. The doped powders were then pelletized under a pressure of 200 MPa, and then sintered at 1400°C for 10 h. Measurements of the electrical conductivity of the sintered specimens within a frequency range of 100 mHz-13 MHz, and temperature range of 300-800°C, revealed an increase in conductivity with increasing temperature. Furthermore, the grain interior, grain boundary and total conductivity of 8YSZ were found to be enhanced by the addition of 1 wt.% B₂O₃. This is attributed to the lattice distortion created by the addition of $B^{3+}$ cations to the 8YSZ lattice, which leads to an increase in the concentration of oxygen vacancies, thus ultimately resulting in an enhanced electrical conductivity.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1380-1383
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Co₃O₄ on the Fracture Toughness and Microstructure of Yttria-Stabilized Cubic Zirconia (8YSZ)
    Autorzy:
    Aktas, B.
    Tekeli, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401433.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Je
    81.20.Ev
    81.40.Np
    82.47.Ed
    Opis:
    The effects of the addition of Co₃O₄ to yttria-stabilized zirconia (8YSZ) on fracture toughness and microstructure was investigated using micro-indentation and scanning electron microscopy (SEM). Undoped and 1-15 wt.% Co₃O₄-doped 8YSZ powders were prepared using a colloidal process and then pelletized under a pressure of 200 MPa. The 8YSZ specimens were sintered at 1400°C for 1 h. SEM results showed that Co₃O₄ precipitated as a secondary phase among the primary 8YSZ grains. Furthermore, because of the presence of Co₃O₄ secondary phases at the grain boundaries of 8YSZ, the grain sizes of the 8YSZ samples increased with the addition of 1-15 wt.% Co₃O₄. The fracture toughness values of the undoped and 1 wt.% Co₃O₄-doped 8YSZ were determined to be 1.64 and 2.86 MPa $m^{1//2}$, respectively, indicating the fracture toughness of 8YSZ increased in 1 wt.% Co₃O₄ addition. The fracture toughness of 8YSZ increased upon the addition of 1 wt.% Co₃O₄.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1384-1387
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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