Mechanical characterization of highly porous beta-Si3N4 ceramics fabricated via partial sintering & starch addition
Kalemtaş, Ayşe and Topateş, Gülsüm and Özçoban, Hüseyin and Mandal, Hasan and Kara, Ferhat and Janssen, Rolf (2013) Mechanical characterization of highly porous beta-Si3N4 ceramics fabricated via partial sintering & starch addition. Journal of the European Ceramic Society (Sl), 33 (9). pp. 1507-1515. ISSN 0955-2219 (Print) 1873-619X (Online)
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Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2012.10.036
In this study, porous beta-Si3N4 ceramics containing limited amount of Sm2O3 and CaO as sintering aids were produced by addition of potato starch (10 and 20 vol.%) and partial sintering. Two different Si3N4 powders, alpha- and beta-, were used as starting materials. Scanning electron microscopy investigations revealed that development of elongated beta-Si3N4 grains were much more pronounced when alpha-Si3N4 starting powder was used. Even though porosity values of the compositions prepared by using alpha-Si3N4 (similar to 57.0-58.4%) is significantly higher than the samples produced by beta-Si3N4 (42.6%), no significant change was observed for the bending strength, fracture toughness and Weibull modulus. This indicates that microstructural features have a significant contribution to the mechanical properties of the porous materials in terms of bending strength and fracture toughness.
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