Examinando por Materia "SINTERING"

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  • Miniatura
    PublicaciónAcceso abierto
    Influencia de la relación masa/área en las propiedades de cerámicas de PZN-5PT-5BT
    (2013-10-28) Villaquiran, C. F. (Claudia Fernanda)
    0,90Pb(Zn1/3Nb2/3)O3–0,05PbTiO3-0,05BaTiO3 (PZN-5PT-5BT) ceramic powders, with majority perovskite phase, were synthesized using the columbite method. These powders were shaped into cylindrical pellets, which had two different mass/area ratios. The pellets were sintered within 1040 and 1150°C during one hour and under a rich lead oxide atmosphere. The percentage of perovskite phase, for both powders and ceramics (surface and interior), was obtained by X-rays diffraction spectrum, where it was observed that ceramic samples present higher percentage of perovskite phase and the highest density value when sintered at 1100 ºC during one hour. Morphology was analyzed using scanning electron microscopy. It revealed that the mass/area ratio influences the stabilization of the perovskite phase within the sintering process, the bigger the content of mass for area unit the more stable the perovskita phase
  • Miniatura
    PublicaciónAcceso abierto
    Sinterización cerámica por elementos finitos
    (2014-05-06) Arango, N. (Nolasco); Restrepo-Ochoa, J. L. (Jorge Luis); López, N. J. (Nelson de Jesús); Carvajal, L. (Leonardo)
    This paper describes and demonstrates the effectiveness of a finite-element procedure to predict the compactation of a green ceramic isostatics pressed plate during sintering process. The approach is based on the conservation of mass principle and requires for its implementation: i) description of the finite element meshes of the green plate when ejected from the press, and ii) the density of the plate after compactation and sintering process. Numerical compactation predictions have been compared with experimental data. The comparisons reveal that the quantitative predictions regarding diameter and height range correlate closely with the measured values showing a difference of 0.52% in diameter and 0.48% in height and a variation on shrinkage of 3.49%. We consider this to be in good agreement, for most practical purposes.