Correlation between fracture toughness and microstructure of seeded silicon nitride ceramics |
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| Authors: | D. Bučevac S. Bošković B. Matović Lj. Živković M. Vlajić Vladimir Krstić |
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| Affiliation: | (1) Institute of Nuclear Sciences Vinča, 11001 Belgrade, Serbia and Montenegro;(2) Faculty of Electronic Engineering, University of Niš, Nis, Serbia and Montenegro;(3) Centre for Manufacturing of Advanced Ceramics and Nanomaterials, Queens University, Kingston, ON, Canada |
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| Abstract: | Microstructure development and fracture toughness of Si3N4 composites were studied in the presence of seeds and Al2O3 + Y2O3 as sintering aids. The elongated β-Si3N4 seeds were introduced into two different α-Si3N4 matrix powders; one was the ultra fine powder matrix and the other was the coarse powder matrix. The amount of seeds varied from 0 to 6 wt%. The grain growth inhibition and the mechanism of toughening were discussed and correlated with microstructure. The maximum fracture toughness of 9.0 MPa m1/2 was obtained for ultra fine powder with 5 wt% seeds hot pressed at 1,700 °C for 6 h. |
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