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High pressure compaction of nanosize ceramic powders

Published online by Cambridge University Press:  31 January 2011

M. R. Gallas ,
A. R. Rosa ,
T. H. Costa  and
J. A. H. da Jornada
M. R. Gallas
Affiliation:
Instituto de Física, Universidade Federal do Rio Grande do Sul, P.O. Box 15051, Porto Alegre 91501-970, RS, Brazil
A. R. Rosa
Affiliation:
Instituto de Física, Universidade Federal do Rio Grande do Sul, P.O. Box 15051, Porto Alegre 91501-970, RS, Brazil
T. H. Costa
Affiliation:
Instituto de Química, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
J. A. H. da Jornada
Affiliation:
Instituto de Física, Universidade Federal do Rio Grande do Sul, P.O. Box 15051, Porto Alegre 91501–970, RS, Brazil
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Abstract

High-density ceramic materials from nanosize ceramic powders were produced by high pressure under nearly hydrostatic environment up to 5.6 GPa, on a special configuration in a toroidal-type apparatus, at room temperature. Attempts to use a common solid pressure transmitting medium, as NaCl, resulted in cracked samples. Lead and indium, which have an extremely low shear strength, proved to be the suitable choices as a pressure-transmitting medium to compact these ceramic materials, in order to obtain high-density samples. Transparent amorphous SiO2-gel and translucent γ−Al2O3 samples, in bulk, with volumes about 40 mm3, hard and crack-free were obtained. Densities over 90% of full density for the γ−Al2O3 samples and over 80% for the compacted SiO2-gel samples were obtained. In addition, from the density-pressure curve, the yield strength (σ) for γ−Al2O3 was estimated, for the first time, as 2.6 GPa. Vickers microhardness values were in the range of 5.7 GPa for the γ−Al2O3 samples, and 4.0 GPa for the SiO2-gel samples, under loads of 50 g. An important and practical application of these results is the possibility of producing bulk γ−Al2O3, a new alumina material, which was not possible to prepare before due to the conversion to a phase during the normal sintering process. Additionally, specially for SiO2-gel, a very important application of this study is the possibility of incorporation of organic substances in an inorganic matrix, using high pressure at room temperature.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 3 , March 1997 , pp. 764 - 768
Copyright
Copyright © Materials Research Society 1997

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