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Melted Synthetic Zirconolite-Based Matrices: Effect of Cooling Rate and Heat Treatment on Ceramic Microstructure and Chemical Durability

Published online by Cambridge University Press:  21 March 2011

T. Advocat ,
P.J. McGlinn ,
C Fillet ,
G. Leturcq ,
S. Schuller ,
A. Bonnetier  and
K. Hart
T. Advocat
Affiliation:
CEA/SCD-Marcoule, BP 171 30207 Bagnols-sur-Cèze Cedex, France
P.J. McGlinn
Affiliation:
ANSTO, New Illawarra Road, Menai PMB1, NSW2234, Australia
C Fillet
Affiliation:
CEA/SCD-Marcoule, BP 171 30207 Bagnols-sur-Cèze Cedex, France
G. Leturcq
Affiliation:
ANSTO, New Illawarra Road, Menai PMB1, NSW2234, Australia
S. Schuller
Affiliation:
CEA/SCD-Marcoule, BP 171 30207 Bagnols-sur-Cèze Cedex, France
A. Bonnetier
Affiliation:
CEA/SCD-Marcoule, BP 171 30207 Bagnols-sur-Cèze Cedex, France
K. Hart
Affiliation:
ANSTO, New Illawarra Road, Menai PMB1, NSW2234, Australia
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Abstract

The heat treatment conditions are a key factor in fabricating zirconolite ceramics and glass-ceramics following high-temperature melting. An oxide mixture melted at 1450°C and subsequently heat-treated at 1200°C yielded a glass-ceramic containing crystallized zirconolite–2M. The silica-enriched residual glass represented about 60-70 vol% of the total; the actinide surrogates (Nd, Ce)were equally distributed between the residual glass and the zirconolite crystals. Zirconolite ceramics obtained after melting an oxide mixture at 1600–1700°C consisted of zirconolite, perovskite and rutile. Rapid cooling rates (> 100°#x00B0;··min-1) were obtained by pouring the melt into ingot molds; the resulting zirconolite ceramics were characterized by crystals of zirconolite-2M ranging from 1 to no more than 20 μm. Slow cooling (< 25°C#x00B0;··min-1 produced ceramics with crystals several hundred micrometers long. Despite the microstructural differences, the chemical durability of the zirconolite ceramics was identical. The initial alteration rates r0 were about two orders of magnitude lower than those measured for the residual aluminosilicate glass of the zirconolite glass-ceramics. Moreover, during long-term leach tests at high S/V ratios to obtain advanced degrees of reaction progress, the alteration rates of all the materials diminished by over 3 to 4 orders of magnitude below r0.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 663: Symposium – Scientific Basis for Nuclear Waste management XXIV , 2000 , 277
Copyright
Copyright © Materials Research Society 2001

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