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Synthesis of sinteractive single-phase microstructure yttrium disilicate precursor powder using hydrothermal processing

Published online by Cambridge University Press:  31 January 2011

P. A. Trusty,
K. C. Chan and
C. B. Ponton
P. A. Trusty
Affiliation:
IRC in Materials for High Performance Applications, The University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
K. C. Chan
Affiliation:
School of Metallurgy & Materials, The University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
C. B. Ponton
Affiliation:
School of Metallurgy & Materials and IRC in Materials for High Performance Applications, The University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
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Abstract

This paper is the first report of the synthesis of a sinteractive single-phase microstructure yttrium disilicate precursor powder using hydrothermal processing. The effect of the pH of the precursor chemicals on the ease of formation of a single-phase material was investigated using x-ray diffraction, TEM, and SEM. Under very acidic conditions (pH 1), the formation of yttrium chloride, in addition to the yttrium disilicate precursors, produced a powder that absorbed moisture, did not sinter well, and produced a two-phase interpenetrating microstructure after sintering. At pH 6, yttrium chloride no longer formed, but the interpenetrating network persisted after sintering. Only under basic conditions (pH 10) did single-phase yttrium disilicate form after sintering. This work is noteworthy because the calcination time of 1 h required for the formation of this ceramic at 1050 °C is over an order of magnitude lower than the calcination times of over 100 h required when calcined in the temperature range 900 °C to 1150 °C, as reported previously by other workers.

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Articles
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Journal of Materials Research , Volume 13 , Issue 11 , November 1998, pp. 3135 - 3143
Copyright
Copyright © Materials Research Society 1998

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