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Fabrication and Characterization of In Situ Porous Si3 N4- Si2 N2 O- BN Ceramic.
- Source :
- International Journal of Applied Ceramic Technology; Sep2014, Vol. 11 Issue 5, p832-838, 7p
- Publication Year :
- 2014
-
Abstract
- Porous Si<subscript>3</subscript> N<subscript>4</subscript>- Si<subscript>2</subscript> N<subscript>2</subscript> O- BN ceramic was fabricated at 1750°C using Si<subscript>3</subscript> N<subscript>4</subscript>, BN, and ( NH<subscript>4</subscript>)<subscript>2</subscript> HPO<subscript>4</subscript> as starting materials. During the sintering process, oxygen from the decomposed products of ( NH<subscript>4</subscript>)<subscript>2</subscript> HPO<subscript>4</subscript> would bond Si and N in the liquid phase to form Si<subscript>2</subscript> N<subscript>2</subscript> O. The microstructure and properties of the porous ceramics were investigated. With the ( NH<subscript>4</subscript>)<subscript>2</subscript> HPO<subscript>4</subscript> content varied from 10 to 50 vol.%, porosity of the porous Si<subscript>3</subscript> N<subscript>4</subscript>- Si<subscript>2</subscript> N<subscript>2</subscript> O- BN ceramic increased from 43.5% to 51%. The microstructure, mechanical, and dielectric properties was well controlled by adjusting ( NH<subscript>4</subscript>)<subscript>2</subscript> HPO<subscript>4</subscript> contents. The present technique offers a more simple way of synthesizing porous Si<subscript>3</subscript> N<subscript>4</subscript>- Si<subscript>2</subscript> N<subscript>2</subscript> O- BN ceramics. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 1546542X
- Volume :
- 11
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- International Journal of Applied Ceramic Technology
- Publication Type :
- Academic Journal
- Accession number :
- 97936774
- Full Text :
- https://doi.org/10.1111/ijac.12134