caa a22 4500 463229657 CHVBK 20180405153238.0 cr unu---uuuuu 170326e20070701xx s 000 0 eng 10.1007/s10853-006-0826-9 doi (NATIONALLICENCE)springer-10.1007/s10853-006-0826-9 Effect of grain width and aspect ratio on mechanical properties of Si3N4 ceramics [Elektronische Daten] [Zoran Krstic, Zhengbo Yu, Vladimir Krstic] Sintering additives Y2O3 and Al2O3 with different ratios ((Y2O3/Al2O3) from 1 to 4) were used to sinter Si3N4 to high density and to induce microstructural changes suitable for raising mechanical properties of the resultant ceramics. The sintered Si3N4 ceramics have bi-modal microstructures with elongated β-Si3N4 grains uniformly distributed in a matrix of equiaxed or slightly elongated grains. Pores were found within the grain boundary phase at the junction regions of Si3N4 grains. The highest average aspect ratio (length/width of the grains) of ∼4.92 was found for Y2O3/Al2O3 ratio of 2.33 with fracture toughness and strength values of ∼7MPam1/2 and 800MPa, respectively. The effect of microstructure, specifically grain morphology, on mechanical properties of sintered Si3N4 were investigated and found that the aspect ratio of the elongated grains is the most important microstructural feature which controls mechanical properties of these ceramics. Springer Science+Business Media, LLC, 2007 Krstic Zoran Mechanical and Materials, Queen's University, 60 Union st, K7M 1B5, Kingston, ON, Canada aut Yu Zhengbo Mechanical and Materials, Queen's University, 60 Union st, K7M 1B5, Kingston, ON, Canada aut Krstic Vladimir Mechanical and Materials, Queen's University, 60 Union st, K7M 1B5, Kingston, ON, Canada aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/14(2007-07-01), 5431-5436 0022-2461 42:14<5431 2007 42 10853 https://doi.org/10.1007/s10853-006-0826-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-0826-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Krstic Zoran Mechanical and Materials, Queen's University, 60 Union st, K7M 1B5, Kingston, ON, Canada aut NATIONALLICENCE 700 1- Yu Zhengbo Mechanical and Materials, Queen's University, 60 Union st, K7M 1B5, Kingston, ON, Canada aut NATIONALLICENCE 700 1- Krstic Vladimir Mechanical and Materials, Queen's University, 60 Union st, K7M 1B5, Kingston, ON, Canada aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/14(2007-07-01), 5431-5436 0022-2461 42:14<5431 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer