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Corrosion of K-3 Glass-contact refractory in sodium-rich aluminosilicate melts

Published online by Cambridge University Press:  10 February 2011

X. D. Lu ,
H. Gan ,
A. C. Buechele  and
I. L. Pegg
X. D. Lu
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064.
H. Gan
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064.
A. C. Buechele
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064.
I. L. Pegg
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064.
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Abstract

The corrosion of the glass-contact refractory Monofrax K-3 in two sodium-rich aluminosilicate melts has been studied at 1208 and 1283°C using a modified ASTM procedure with constant agitation of the melt by air bubbling. The results for the monolithic refractory indicate a fast initial stage involving phase dissolution and transformation and a later “passivated” stage in which the surface of the refractory has been substantially modified. The composition of the stable spinel phase in the altered layer on monolithic coupons of K-3 is almost identical to the equilibrium composition bracketed by the dissolution of powdered K-3 into under-saturated melts on the one hand, and by crystallization of spinels from supersaturated melts on the other. The temperature and melt shear viscosity were found to have significant effects on the rates of K-3 dissolution and transformation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 556: Symposium QQ – Scientific Basis for Nuclear Waste Management XXII , 1999 , 279
Copyright
Copyright © Materials Research Society 1999

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References

REFERENCES

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