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Reactivity in the chromium oxide-calcium fluoride system: An empirical approach

Published online by Cambridge University Press:  31 January 2011

Frans Vos ,
Luc Delaey ,
Marc De Bonte  and
Ludo Froyen
Frans Vos
Affiliation:
Department of Metallurgy and Materials Engineering, Katholieke Universiteit Leuven, Heverlee 3001, Belgium
Luc Delaey
Affiliation:
Department of Metallurgy and Materials Engineering, Katholieke Universiteit Leuven, Heverlee 3001, Belgium
Marc De Bonte
Affiliation:
Department of Metallurgy and Materials Engineering, Katholieke Universiteit Leuven, Heverlee 3001, Belgium
Ludo Froyen
Affiliation:
Department of Metallurgy and Materials Engineering, Katholieke Universiteit Leuven, Heverlee 3001, Belgium
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Abstract

The reaction mechanisms observed when sintering loose Cr2O3–CaF2 powder mixtures were analyzed, and the influence of the sintering parameters on the reaction behavior is presented. Using x-ray diffraction (XRD), energy-dispersive spectroscopy (EDS), and differential thermal analysis (DTA) measurements, CaCrO4 was shown to be the reaction product when sintering in air. The reaction occurs in two steps: CaF2 transforms to CaO at the Cr2O3–CaF2 interface, followed by a CaO–Cr2O3 interaction, which creates the reaction product. Scanning electron microscopy (SEM) and x-ray fluorescence (XRF) analysis showed an increasing loss of CaF2 with increasing sintering temperature and heating rate, while an opposite evolution of the amount of reaction product was observed.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 6 , June 1999 , pp. 2518 - 2523
Copyright
Copyright © Materials Research Society 1999

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References

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