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Fabrication of Hard and Strong α/β-Si3N4 Composites With MgSiN2 as Addivitives.
- Source :
-
Journal of the American Ceramic Society . Dec2006, Vol. 89 Issue 12, p3824-3826. 3p. 1 Black and White Photograph, 1 Chart, 1 Graph. - Publication Year :
- 2006
-
Abstract
- α/β-Si3N4 composites with various α/β phase ratios were prepared by hot pressing at 1600°–1650°C with MgSiN2 as sintering additives. An excellent combination of mechanical properties (Vickers indentation hardness of 23.1 GPa, fracture strength of about 1000MPa, and toughness of 6.3 MPa·m1/2) could be obtained. Compared with conventional Si3N4-based ceramics, this new material has obvious advantages. It is as hard as typical in-situ-reinforced α-Sialon, but much stronger than the latter (700 MPa). It has comparable fracture strength and toughness, but is much harder than β-Si3N4 ceramics (16 GPa). The microstructures and mechanical properties can be tailored by choosing the additive and controlling the heating schedule. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00027820
- Volume :
- 89
- Issue :
- 12
- Database :
- Academic Search Index
- Journal :
- Journal of the American Ceramic Society
- Publication Type :
- Academic Journal
- Accession number :
- 23216483
- Full Text :
- https://doi.org/10.1111/j.1551-2916.2006.00958.x