ASTM-D7542 2009

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D7542-09 Standard Test Method for Air Oxidation of Carbon and Graphite in the Kinetic Regime

Published By	Publication Date	Number of Pages
ASTM	2009	12

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Categories: 71.060.10 - Chemical elements, ASTM

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Description

ASTM D7542-09

Historical Standard: Standard Test Method for Air Oxidation of Carbon and Graphite in the Kinetic Regime

ASTM D7542

Scope

1.1 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.

1.2 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 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 500–550°C up to about 700–750°C.

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.4 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 and health practices and determine the applicability of regulatory limitations prior to use.

Keywords

activation energy; air; carbon; graphite; kinetic regime; oxidation rate; pre-exponential factor; standard oxidation temperature; temperature

ICS Code

ICS Number Code 71.060.10 (Chemical elements)

DOI: 10.1520/D7542-09

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents Terminology
2	Summary of Test Method Significance and Use Interferences Apparatus
3	FIG. 1
4	FIG. 2
5	Reagents and Materials Hazards Sampling and Test Specimens Calibration and Standardization Procedure FIG. 3 FIG. 4
6	Calculation or Interpretation of Results
7	Report Precision and Bias TABLE 1
8	Keywords A1. EXAMPLE REPORT OF OXIDATION RATE RESULTS A1.1 TABLE 2 TABLE 3
9	FIG. A1.1
10	A2. EXAMPLES OF ARRHENIUS PLOTS AND TEST RESULTS REPORT A2.1 A2.2 Calculation A2.3 Test Results FIG. A1.2 TABLE A2.1
11	TABLE A2.2 TABLE A2.3 FIG. A2.1
12	FIG. A2.2

Additional information

Standard Title	D7542-09 Standard Test Method for Air Oxidation of Carbon and Graphite in the Kinetic Regime
Published Code	ASTM
Publication Date	2009
Pages Count	12
ICS Codes	71.060.10 - Chemical elements