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Relationship between Microstructure, Toughening Mechanisms and Fracture-Toughness of Reinforced Silicon-Nitride Ceramics

Sajgalik, P.; Dusza, J.; Hoffmann, M. J.

Different microstructures in Si3N4 ceramics containing Y2O3 and Al2O3
as sintering additives were prepared by two-step sintering, Pull-out
and elastic bridging were most frequently observed as the toughening
mechanisms in samples with fine-grained microstructures having
needlelike beta-Si3N4 grains with diameters of <1 mu m. Crack
deflection was the main toughening mechanism observed in samples with
coarse-grained microstructures having grains with diameters of >1 mu m.
The values of fracture toughness mere varied from 6.1 to 8.2 MPa .
m(1/2) with respect to the microstructural characteristics,
characterized by the volume fraction of needlelike grains and their

Zugehörige Institution(en) am KIT Institut für Keramik im Maschinenbau (IKM)
Publikationstyp Zeitschriftenaufsatz
Jahr 1995
Sprache Englisch
Identifikator ISSN: 0002-7820
KITopen ID: 1000007781
Erschienen in Journal of the American Ceramic Society
Band 78
Heft 10
Seiten 2619-2624
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