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Heat Treatment of Nanocrystalline Al2O3-Zr02

Published online by Cambridge University Press:  10 February 2011

Bridget M. Smyser ,
Jane F. Connelly ,
Richard D. Sisson Jr  and
Virgil Provenzano
Bridget M. Smyser
Affiliation:
Worcester Polytechnic Institute, Department of Materials Engineering, Worcester, MA 01609
Jane F. Connelly
Affiliation:
Worcester Polytechnic Institute, Department of Materials Engineering, Worcester, MA 01609
Richard D. Sisson Jr
Affiliation:
Worcester Polytechnic Institute, Department of Materials Engineering, Worcester, MA 01609
Virgil Provenzano
Affiliation:
Naval Research Laboratory, Code 6320, Washington, DC 20375–5343
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Abstract

The effects of grain size on the phase transformations in nanocrystalline ZrO2-Al2O3 have been experimentally investigated. Compositions from 10 to 50 vol% Al2O3 in ZrO2 were obtained as a hydroxide gel. The powders were then calcined at 600 °C for 17 hours and heat treated at 1100 °C for 24 and 120 hours and at 1200 °C for 2 hours. The phase distribution and grain size were determined using x-ray diffraction and transmission electron microscopy. The initial grain size after calcining was 8–17 nm. It was determined that the critical ZrO2 grain size to avoid the tetragonal to monoclinic phase transformation on cooling from 1100 °C was between 17 and 25 nm. Samples containing 50% Al2O3 maintained a grain size below the critical size for all times and temperatures. The 30% Al2O3 samples showed the same behavior in all but one heat treatment. The remainder of the samples showed significant grain growth and at least partial transformation to the monoclinic phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 457: Symposium V – Nanophase and Nanocomposite Materials II , 1996 , 335
Copyright
Copyright © Materials Research Society 1997

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