Papers by Author: J.S. Moya

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Authors: S. Deville, Jérôme Chevalier, Gilbert Fantozzi, J.F. Bartolomé, J. Requena, J.S. Moya, Ramon Torrecillas, L.A. Díaz
Authors: Y. Torres Hernández, Marc Anglada, Luis Llanes, J.F. Bartolomé, M. Díaz, J.S. Moya
Abstract: The fracture and fatigue behaviour of a mullite/molybdenum composite is investigated. The attention is focused on the measurement of fracture toughness, KIc, on long through the thickness cracks by using SENB specimens, and on the growth of indentation cracks under static, monotonic and cyclic loads. Molybdenum was chosen to reinforce the mullite matrix because of the similar thermal expansion coefficients for both phases. It is essential to know and take into account the shape of the initial indentation cracks as well as the eccentricity change after extension under monotonic and cyclic stress. This study shows that, in mullite/molybdenum composites, static fatigue effects are negligible, but these composites are susceptible to mechanical degradation under cyclic loads. It is shown that the fatigue crack growth rate exhibits a high dependence on Kmax and that the fatigue sensitivity, defined as the ratio between fatigue crack growth rate threshold and KIc, is much lower than for other materials processed by powder metallurgy.
Authors: Antônio Carlos da Silva, J.J. Reinosa, J.S. Moya, J.F. Fernandez, Sonia Regina Homem de Mello-Castanho
Abstract: Green stoneware tiles have been produced by the incorporation of galvanic waste to industrial compositions processed from kaolinitic clay, feldspar, quartz. Some compositions with recycled domestic glass are also prepared. The galvanic waste required a calcination step to eliminate the gas forming species prior its incorporation into industrial processes. The effective absorption of metal from the galvanic waste was attained through the formation of crystalline phases. The presence of chromite type particles in the porcelain matrix acts as “in situ” to form pigments. The crystallization process also produces a higher consume of metal cations in the surrounded area of the crystalline pigments. The followed procedure allowed to effectively immobilized up to 20 wt% metal waste in a porcelain stoneware that satisfy both the mechanical and the chemical standards required to massively commercialize such a product.
Authors: Antoni P. Tomsia, Andreas M. Glaeser, J.S. Moya
Authors: J.S. Moya, J.F. Bartolomé, M. Díaz, J. Requena
Authors: S. López-Esteban, J.F. Bartolomé, J.S. Moya, A. Sagisaka, K. Matsumoto, Tadashi Tanimoto
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