TY - JOUR
T1 - Mechanical characterization of highly porous β-Si3N4 ceramics fabricated via partial sintering & starch addition
AU - Kalemtas, Ayse
AU - Topates, Gulsum
AU - Özcoban, Hüseyin
AU - Mandal, Hasan
AU - Kara, Ferhat
AU - Janssen, Rolf
PY - 2013/8
Y1 - 2013/8
N2 - In 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.
AB - In 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.
KW - 4-Point bending strength
KW - Fracture toughness
KW - Microstructural evolution
KW - Porous β-SiN
UR - http://www.scopus.com/inward/record.url?scp=84875960645&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2012.10.036
DO - 10.1016/j.jeurceramsoc.2012.10.036
M3 - Article
AN - SCOPUS:84875960645
SN - 0955-2219
VL - 33
SP - 1507
EP - 1515
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 9
ER -