Practical aspects for characterizing air oxidation of graphite

Cristian I. Contescu; Samina Azad; Doug Miller; Michael J. Lance; Frederick S. Baker; Timothy D. Burchell

doi:10.1016/j.jnucmat.2008.07.020

Practical aspects for characterizing air oxidation of graphite

Cristian I. Contescu, Samina Azad, Doug Miller, Michael J. Lance, Frederick S. Baker, Timothy D. Burchell

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93 Scopus citations

Abstract

The efforts for designing a meaningful and acceptable standard test method for characterization of kinetic parameters of air oxidation of graphite helped identify several practical issues that must be considered for the development of such a test. Using standard size (and shape) specimens, large enough in size to accommodate the inherent local microstructure differences between graphite samples, resulted in non-uniform oxidation profiles and preferential binder oxidation; this was not expected based on the linearity of Arrhenius plots and the (large) values of activation energy. It was found that the transition between the regimes 1 and 2 of graphite oxidation occurs gradually, depending both on the oxidation temperature and rate of oxygen supply. Nevertheless, measuring oxidation rates obtained on standard size samples provides a basis for a meaningful comparison among materials, which may serve as much needed information for predictive models.

Original language	English
Pages (from-to)	15-24
Number of pages	10
Journal	Journal of Nuclear Materials
Volume	381
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jnucmat.2008.07.020
State	Published - Oct 31 2008
Externally published	Yes

Funding

This research was funded by the US Department of Energy, Office of Nuclear Energy Science and Technology under contract DE-AC05-00OR22725 with UT Battelle, LLC. The authors acknowledge the fruitful exchange of ideas with Drs Gary Pruett (Goodrich Corp., USA), Anthony Wickham (University of Manchester, UK), Martin Metcalfe (NexiaSolutions, UK), Se-Hwan Chi (KAERI, Korea), and Shri Awasthi (HITCO Carbon Composites, Inc.). Invaluable discussions with Dr. Bob Wichner (ORNL) and contributions of colleagues Joseph Kelly, Ashli Clark, and ORAU-ORISE intern students Chinwe Onuorah (HERE program) and Zack Vance (SULI program) are greatly appreciated.

Funders	Funder number
Office of Nuclear Energy Science and Technology	DE-AC05-00OR22725
US Department of Energy
Battelle

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10.1016/j.jnucmat.2008.07.020

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AU - Contescu, Cristian I.

AU - Azad, Samina

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AU - Lance, Michael J.

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AU - Burchell, Timothy D.

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AB - The efforts for designing a meaningful and acceptable standard test method for characterization of kinetic parameters of air oxidation of graphite helped identify several practical issues that must be considered for the development of such a test. Using standard size (and shape) specimens, large enough in size to accommodate the inherent local microstructure differences between graphite samples, resulted in non-uniform oxidation profiles and preferential binder oxidation; this was not expected based on the linearity of Arrhenius plots and the (large) values of activation energy. It was found that the transition between the regimes 1 and 2 of graphite oxidation occurs gradually, depending both on the oxidation temperature and rate of oxygen supply. Nevertheless, measuring oxidation rates obtained on standard size samples provides a basis for a meaningful comparison among materials, which may serve as much needed information for predictive models.

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Practical aspects for characterizing air oxidation of graphite

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