# Low-Temperature High-Pressure Consolidation of Amorphous $Al_{2}O_{3}-15\hspace{5mm}{mol\%}\hspace{5mm}Y_{2}O_{3}$

Thangamani, Nithyanantham and Gandhi, Ashutosh S and Jayaram, Vikram and Chokshi, Atul H (2005) Low-Temperature High-Pressure Consolidation of Amorphous $Al_{2}O_{3}-15\hspace{5mm}{mol\%}\hspace{5mm}Y_{2}O_{3}$. In: Journal of the American Ceramic Society, 88 (10). pp. 2696-2701.

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## Abstract

This study examined pressure consolidation of amorphous $Al_{2}O_{3}-15\hspace{5mm}{mol\%}\hspace{5mm}Y_{2}O_{3}$ powders prepared by co-precipitation and spray pyrolysis. The two amorphous powders had similar true densities and crystallization sequences. Uniaxial hot pressing was carried out at $450^o-600^oC$ with a moderate pressure of 750 MPa. The co-precipitated powder could be hot pressed to a maximum relative density of $98\%$ and remained amorphous. Pressure adversely affected the densification of the spray-pyrolyzed powder by favoring an early crystallization of $\gamma-Al_{2}O_{3}$ phase at $580^oC$. Plastic deformation of the amorphous phase is believed to be responsible for the large densification of the amorphous powders.

Item Type: Journal Article Copyright for this article belongs to Blackwell Publishing. Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) 20 Jan 2006 27 Aug 2008 11:32 http://eprints.iisc.ernet.in/id/eprint/3999