ePrints@IIScePrints@IISc Home | About | Browse | Latest Additions | Advanced Search | Contact | Help

Bulk, Dense, Nanocrystalline Yttrium Aluminum Garnet by Consolidation of Amorphous Powders at Low Temperatures and High Pressures

Choudhury, Samrat and Gandhi, Ashutosh S and Jayaram, Vikram (2003) Bulk, Dense, Nanocrystalline Yttrium Aluminum Garnet by Consolidation of Amorphous Powders at Low Temperatures and High Pressures. In: Journal of the American Ceramic Society, 86 (2). pp. 247-251.

Full text not available from this repository. (Request a copy)

Abstract

Amorphous $Al_2O_3-37.5\%\hspace{2mm}Y_2O_3$ powders, prepared using spray pyrolysis followed by partial or complete thermal decomposition, were hot-pressed at $315^o–640^o\hspace{2mm}C$ and 500 or 750 MPa uniaxial pressure. Hot pressing of fully decomposed amorphous powder at $450^o-640^o\hspace{2mm}C$ at pressures up to 750 MPa led to densification (up to 96%) as well as nanocrystallization of yttrium aluminum garnet (YAG). When the pressure was applied during heating, instead of after reaching the final temperature, higher relative densities resulted. Fully crystalline starting powder did not densify. The low true density of the amorphous phase (3.1 g·$cm^{-3}$) was believed to be responsible for the densification through enhanced ionic mobilities.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Blackwell.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 02 Jun 2006
Last Modified: 27 Aug 2008 12:08
URI: http://eprints.iisc.ernet.in/id/eprint/7384

Actions (login required)

View Item View Item