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Sintering Kinetics of an Yttrium Aluminosilicate Glass

Published online by Cambridge University Press:  23 March 2012

Miguel O. Prado ,
Diana Lago  and
Diego S. Rodriguez
Miguel O. Prado*
Affiliation:
Dep. Materiales Nucleares, Centro Atómico Bariloche, Comisión Nac. de Energía Atómica. Consejo Nacional de Investigaciones Científicas y Técnicas. Av. Ezequiel Bustillo, km 9.5, (8400) San Carlos de Bariloche, Río Negro, Argentina
Diana Lago
Affiliation:
Dep. Materiales Nucleares, Centro Atómico Bariloche, Comisión Nac. de Energía Atómica. Consejo Nacional de Investigaciones Científicas y Técnicas. Av. Ezequiel Bustillo, km 9.5, (8400) San Carlos de Bariloche, Río Negro, Argentina
Diego S. Rodriguez
Affiliation:
Dep. Materiales Nucleares, Centro Atómico Bariloche, Comisión Nac. de Energía Atómica.
*
*Email: [email protected]
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Abstract

Yttrium aluminosilicate (YAS) glasses have been proposed as host matrices for the immobilization of radioactive elements. In addition, yttrium has been used to simulate actinides [1]. It is well known that these glasses are resistant to water corrosion and exhibit high Tg and good mechanical properties [2]. As shown in [3], on heating, yttrium disilicate and mullite / sillimanite crystals grow from the pre-existing nucleation sites on the surface, until each glass particle volume is fully crystallized (volume-homogeneous nucleation was not observed), decreasing the glassy surface available for sintering by viscous flow. Sintering takes place simultaneously, by viscous flow but competes with surface crystallization; thus, if thermal treatment is not carefully designed a vitroceramic is obtained. In this paper we study the isothermal sintering kinetics of a YAS glass-powder-size distribution and non-isothermal sintering kinetics at 1, 3, 5, 10 and 15 K/min of two YAS glass-powder-size distributions. From the experimental evidence obtained, and crystallization data from [3], we design a sintering procedure in order to achieve a high-density glass monolith with submicrometric crystalline phases.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1475: Symposium NW – Scientific Basis for Nuclear Waste Management XXXV , 2012 , imrc11-1475-nw35-o49
Copyright
Copyright © Materials Research Society 2012

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References

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