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    Wyświetlanie 1-4 z 4
    Tytuł:
    Effect of CaO Addition on the Sintering Behaviour of Anorthite Formed from Kaolin and CaO
    Autorzy:
    Ouali, A.
    Sahnoune, F.
    Belhouchet, H.
    Heraiz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032557.pdf
    Data publikacji:
    2017-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Je
    81.05.Mh
    81.20.Ev
    81.70.Pg
    65.40.De
    65.60.+a
    Opis:
    Thermal reactions and sintering behavior of kaolin DD3 (Djebel Debbagh, Algeria) and CaO mixtures to obtain dense anorthite ceramics were investigated. Mixed powders were uniaxially pressed and fired between 850 and 1150°C. Firing the pressed specimens yielded a dense anorthite ceramics. The sintered density increased with increase of CaO content and reached the maximum value of 2.57 g/cm³ for the composition containing 10 wt% CaO and fired at 1150°C. Their coefficient of linear expansion of the sintered samples at 1100°C decreases with the addition of CaO. X-ray diffraction experiments carried out on the samples containing varied amount of CaO and fired at the temperatures higher than 1000°C for 2 h showed the presence of only anorthite phase.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 1; 159-161
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Kinetics of Spinel Formation of Algerian Halloysite by Differential Thermal Analysis
    Autorzy:
    Heraiz, M.
    Sahnoune, F.
    Belhouchet, H.
    Raghdi, A.
    Ouali, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033398.pdf
    Data publikacji:
    2017-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.70.Pg
    81.20.Ev
    82.20.-w
    Opis:
    The kinetics of spinel (Al-Si) crystallization from Algerian halloysite (DD1) was investigated using differential thermal analysis. Experiments were carried out on samples between room temperature and 1400°C with constant heating rate from 2 to 20°C min¯¹. The activation energies measured from isothermal and non-isothermal treatments were 1054.85 and 1140 kJ mol¯¹, respectively, for the spinel (Al-Si) formation. The Avrami constant n obtained by the Ligero method and the m parameter obtained by the Matusita method were about 2 for spinel crystallization. This value indicates that the crystallization mechanism of Al-Si spinel phase proceeds by bulk nucleation of the phase formation with a constant number of nuclei and that the three-dimensional growth of crystals is controlled by diffusion.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 1; 139-142
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation and Phase Transformation of Mullite-Zirconia from Boehmite and Algerian Halloysite
    Autorzy:
    Raghdi, A.
    Heraiz, M.
    Sahnoune, F.
    Ouali, A.
    Redaoui, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033372.pdf
    Data publikacji:
    2017-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Mh
    68.37.hk
    07.85.Nc
    Opis:
    In this work, mullite-zirconia composite were fabricated by reaction sintering of Algerian halloysite Al₂Si₂O₅(OH)₄, boehmite Al(OOH), and zirconia (ZrO₂) powder using conventional heating. The appropriate amount of the three raw powders was ball milled for 5 h and sintered between 1250 and 1650°C for 2 h. A scanning electron microscope was used to characterize the microstructure of sintered samples. A dilatometer and X-ray diffractometer were used to analyze the formation and transformation of phases. It is found that for the addition of zirconia up to 20wt.% the zirconia phase retains its tetragonal structure. The formation of primary mullite in all samples was complete at 1220°C. The cristobalite started to form at 1350°C, and disappeared at 1500°C in the samples of mullite, and at 1450°C when ZrO₂ was added. The zircon compound ZrSiO₄ started to form at 1350°C and completely disappeared at 1550°C. The increase in ZrO₂ ratio promoted the formation of grains with a spherical shape.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 1; 136-138
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methane-Air Equivalence Ratio Effect on Premixed Turbulent Low Swirl Stabilized Flame
    Autorzy:
    Ouali, S.
    Bentebbiche, A.
    Belmrabet, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1205170.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    47.70.pq
    47.27.E
    47.32.Ef
    Opis:
    This work presents a numerical simulation of premixed methane-air low swirl stabilized flame, the geometry describes a low swirl burner kind. Reynolds average Navier-Stokes standard $κ-ε$ model for turbulence coupling to partially premixed model for combustion were used with varying methane equivalence ratio from 0.6 to 1.4. Parameters governing flame structure are investigated; velocity, temperature, $CH_4$ distribution and thermal nitric oxide apparitions fields, results are compared and validated with experimental and large eddy simulation works cited in references, they offer good similarities for all flame parameters studied. Actual study works to find equilibrium between the maximum of generated temperature and the minimum of thermal NO pollutant emissions for low swirl burners without neglecting the flame stabilization which must be maintained.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 3; 717-723
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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