SYMPOSIA PAPER Published: 01 December 2022
STP163920210080

A Microstructural Modeling-Based Approach to Graphite Oxidation beyond ASTM D7542

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ASTM D7542 provides a standardized way to measure the oxidation mass loss rates of graphite in air within a temperature range where chemical kinetics are assumed to dominate. This test was primarily designed to discriminate between graphite candidates for high-temperature gas-cooled reactors based on their oxidation resistance in air and rate sensitivity to temperature variations. However, data measured according to the recommended procedure are useful beyond making comparisons. Quantification of the rate of oxidation and its effects on microstructure and properties is important for nuclear reactor designers, and it is known that many variables play a role in oxidation. In this work, the measured mass loss curves during oxidation in air are compared to a simplified microstructural oxidation model to provide insight into the contributing mechanisms and to shed light on sources of the scatter commonly seen in oxidation results. Suggestions for improving oxidation standards are made with the hopes of broadening the range of applications and maximizing its utility.

Author Information

Paul, Ryan, M.
Oak Ridge National Laboratory, Oak Ridge, TN, US
Contescu, Cristian, I.
Oak Ridge National Laboratory, Oak Ridge, TN, US
Gallego, Nidia, C.
Oak Ridge National Laboratory, Oak Ridge, TN, US
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Pages: 257–278
DOI: 10.1520/STP163920210080
ISBN-EB: 978-0-8031-7726-0
ISBN-13: 978-0-8031-7725-3