Papers by Author: Hasan Mandal

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Authors: N. Çalış, Alpagut Kara, Ferhat Kara, Hasan Mandal
Authors: Nurcan Calis Acikbas, Ferhat Kara, Hasan Mandal
Abstract: - SiAlON ceramics were produced from different starting Si3N4 powders including β-Si3N4 and α-Si3N4 powders and mixtures of these powders. Gas pressure sintering was used for sintering. After sintering, resultant fracture toughness values were correlated with microstructure and starting powders. By optimizing chemistry and process parameters; - SiAlON ceramics with reasonable fracture toughness can be produced from rather coarse β-Si3N4 powder. This could improve the economic viability of SiAlON ceramics since -Si3N4 powders are less costly.
Authors: S. Kurama, Hasan Mandal
Authors: Hasan Mandal, Michael J. Hoffmann
Authors: Hasan Mandal, D.P. Thompson, T. Ekström
Authors: N.C. Acikbas, Alpagut Kara, Servet Turan, Ferhat Kara, Hasan Mandal, Bernd Bitterlich
Abstract: 25α:75β SiAlON composition was designed with different cations and at different molar ratios. Effect of the type of cations both on the composition and the type of intergranular phase investigated after gas pressure sintering and further post sintering heat treatment.
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