Kalemtas, AyseAyseKalemtasTopates, GulsumGulsumTopatesÖzcoban, HüseyinHüseyinÖzcobanMandal, HasanHasanMandalKara, FerhatFerhatKaraJanßen, RolfRolfJanßen2020-07-072020-07-072012-12-21Journal of the European Ceramic Society 9 (33): 1507-1515 (2013)http://hdl.handle.net/11420/6638In this study, porous β-Si3N4 ceramics containing limited amount of Sm2O3 and CaO as sintering aids were produced by addition of potato starch (10 and 20vol.%) and partial sintering. Two different Si3N4 powders, α- and β-, were used as starting materials. Scanning electron microscopy investigations revealed that development of elongated β-Si3N4 grains were much more pronounced when α-Si3N4 starting powder was used. Even though porosity values of the compositions prepared by using α-Si3N4 (∼57.0-58.4%) is significantly higher than the samples produced by β-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. © 2012 Elsevier Ltd.en0955-22192012915071515Elsevier Science4-Point bending strengthFracture toughnessMicrostructural evolutionPorous β-Si N 3 4ChemieTechnikIngenieurwissenschaftenJournal Article10.1016/j.jeurceramsoc.2012.10.036Journal Article