Mechanical characterization of highly porous β-Si3N4 ceramics fabricated via partial sintering & starch addition

Enthalten in
Journal of the European Ceramic Society 
Volume
33
Issue
9
Start Page
1507
End Page
1515
Citation
Journal of the European Ceramic Society 9 (33): 1507-1515 (2013)
Publisher DOI
10.1016/j.jeurceramsoc.2012.10.036
Scopus ID
2-s2.0-84875960645
Publisher
Elsevier Science
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. © 2012 Elsevier Ltd.
Schlagworte
4-Point bending strength
Fracture toughness
Microstructural evolution
Porous β-Si N 3 4
DDC Class
540: Chemie
600: Technik
620: Ingenieurwissenschaften
More Funding Information
Foundation for Scientific Research Projects of Anadolu University (Project number: 090229)
International Research Fellowship Programme
Scientific and Technological Research Council of Turkey