ASTM D7542-21
Standard Test Method for Air Oxidation of Carbon and Graphite in the Kinetic Regime

Standard No.

ASTM D7542-21

Release Date

2021

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM D7542-21

Scope

1.1 This test method recommends a standard procedure for measuring oxidation rates in air of various grades of nuclear graphite and/or manufactured carbon. Following the standard procedure recommended here, one can obtain kinetic parameters that characterize the oxidation resistance in standard conditions of tested materials and that can be used to for materials selection and qualification, and for quality control purposes in the fabrication process. 1.2 This test method covers the rate of oxidative weight loss per exposed nominal geometric surface area, or per initial weight of machined test specimens of standard size and shape, or both. The test is valid in the temperature range where the rate of air oxidation of graphite and manufactured carbon is limited by reaction kinetics. 1.3 This test method also provides a standard oxidation temperature (as defined in 3.1.7), and the kinetic parameters of the oxidation reaction, namely the apparent activation energy and the logarithm of pre-exponential factor in Arrhenius equation. The kinetic parameters of Arrhenius equation are calculated from the temperature dependence of oxidation rates measured over the temperature range where Arrhenius plots (as defined in 3.1.8) are linear, which is defined as the “kinetic” or “chemical control” oxidation regime. For typical nuclear grade graphite materials it was found that the practical range of testing temperatures is from about 500 °C to 550 °C up to about 700 °C to 750 °C. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

ASTM D7542-21 Referenced Document

• ASTM C559 Standard Test Method for Bulk Density by Physical Measurements of Manufactured Carbon and Graphite Articles
• ASTM E1582 Standard Practice for Calibration of Temperature Scale for Thermogravimetry
• ASTM E1970 Standard Practice for Statistical Treatment of Thermoanalytical Data*， 2023-01-01 Update
• ASTM E691 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
• ASTM E898 Standard Test Method of Testing Top-Loading, Direct-Reading Laboratory Scales and Balances

ASTM D7542-21 history

• 2021 ASTM D7542-21 Standard Test Method for Air Oxidation of Carbon and Graphite in the Kinetic Regime
• 2015 ASTM D7542-15 Standard Test Method for Air Oxidation of Carbon and Graphite in the Kinetic Regime
• 2009 ASTM D7542-09 Standard Test Method for Air Oxidation of Carbon and Graphite in the Kinetic Regime