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ASTM Selected Technical Papers
Graphite Testing for Nuclear Applications: The Validity and Extension of Test Methods for Material Exposed to Operating Reactor Environments
Editor
Athanasia Tzelepi
Athanasia Tzelepi
Symposium Co-Chair and STP Editor
1
National Nuclear Laboratory
,
Sellafield,
GB
Search for other works by this author on:
Martin Metcalfe
Martin Metcalfe
Symposium Co-Chair and STP Editor
2
Nuclear Graphite Research Group, Nuclear Engineering Department of MACE, University of Manchester
,
Manchester,
GB
Search for other works by this author on:
ISBN:
978-0-8031-7725-3
No. of Pages:
312
Publisher:
ASTM International
Publication date:
2022

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.

1.
Nightingale
R. E.
,
Nuclear Graphite: Prepared under the Auspices of the Division of Technical Information, United States Atomic Energy Commission
(
San Diego, CA
:
Academic Press
,
2013
).
2.
Burchell
T. D.
,
Carbon Materials for Advanced Technologies
(
Oxford, UK
:
Elsevier Science
,
1999
).
3.
USNR Commission
, HTGR Graphite Core Component Stress Analysis Research Program–Task 1 Technical Letter Report (Argonne, IL:
Argonne National Laboratory
,
2011
).
4.
Standard Specification for Isotropic and Near-Isotropic Nuclear Graphites
, ASTM D7219-19 (
West Conshohocken, PA
:
ASTM International
, approved November 1,
2019
),
5.
Kelly
B. T.
,
Physics of Graphite
(
Dordrecht, The Netherlands
:
Springer
,
1981
).
6.
Boiler and Pressure Vessel Code (BPVC), Section III, Rules for the Construction of Nuclear Facility Components, Division 5, High Temperature Reactors
, ASME BPVC.III.5 (
New York
:
American Society of Mechanical Engineers
,
2017
).
7.
Standard Test Method for Air Oxidation of Carbon and Graphite in the Kinetic Regime
, ASTM D7542-15 (
West Conshohocken, PA
:
ASTM International
, approved October 1,
2015
),
8.
Standard Test Method for Oxidation Mass Loss of Manufactured Carbon and Graphite Materials in Air
, ASTM C1179-21 (
West Conshohocken, PA
:
ASTM International
, approved November 1,
2021
),
9.
Contescu
C. I.
,
Azad
S.
,
Miller
D.
,
Lancea
M. J.
,
Baker
F. S.
, and
Burchell
T. D.
, “
Practical Aspects for Characterizing Air Oxidation of Graphite
,”
Journal of Nuclear Materials
381
, nos.
1–2
(
2008
): 15–24.
10.
Chi
S.-H.
and
Kim
G.-C.
, “
Comparison of the Oxidation Rate and Degree of Graphitization of Selected IG and NBG Nuclear Graphite Grades
,”
Journal of Nuclear Materials
381
, nos.
1–2
(
2008
): 9–14.
11.
Contescu
C. I.
,
Strizak
J. P.
,
Guldan
T. R.
, and
Burchell
T. D.
, Effect of Air Oxidation on Pore Structure Development and Mechanical Properties of Nuclear Graphite, No. ORNL/TM-2010/197 (Oak Ridge, TN:
Oak Ridge National Laboratory
,
2010
).
12.
Wang
P.
,
Contescu
C. I.
,
Yu
S.
, and
Burchell
T. D.
, “
Pore Structure Development in Oxidized IG-110 Nuclear Graphite
,”
Journal of Nuclear Materials
430
, nos.
1–3
(
2012
): 229–238.
13.
Huang
W.-H.
,
Tsai
S.-C.
,
Yang
C.-W.
, and
Kai
J.-J.
, “
The Relationship between Microstructure and Oxidation Effects of Selected IG- and NBG-Grade Nuclear Graphites
,”
Journal of Nuclear Materials
454
(
2014
): 149–158.
14.
Contescu
C. I.
Guldan
T.
,
Wang
P.
, and
Burchell
T. D.
, “
The Effect of Microstructure on Air Oxidation Resistance of Nuclear Graphite
,”
Carbon
50
, no.
9
(
2012
): 3354–3366.
15.
Lee
J. J.
,
Ghosh
T. K.
, and
Loyalka
S. K.
, “
Comparison of NBG-18, NBG-17, IG-110 and IG-11 Oxidation Kinetics in Air
,”
Journal of Nuclear Materials
500
(
2018
): 64–71.
16.
Chi
S.-H.
and
Kim
G.-C.
, “
Effects of Air Flow Rate on the Oxidation of NBG-18 and NBG-25 Nuclear Graphite
,”
Journal of Nuclear Materials
491
(
2017
): 37–42.
17.
Smith
R. E.
,
Kane
J. J.
, and
Windes
W. E.
, “
Determining the Acute Oxidation Behavior of Several Nuclear Graphite Grades
,”
Journal of Nuclear Materials
545
(
2021
): 152648,
18.
Kane
J. J.
,
Contescu
C. I.
,
Smith
R. E.
,
Strydom
G.
, and
Windes
W. E.
, “
Understanding the Reaction of Nuclear Graphite with Molecular Oxygen: Kinetics, Transport, and Structural Evolution
,”
Journal of Nuclear Materials
493
(
2017
): 343–367.
19.
Bhatia
S. K.
and
Perlmutter
D. D.
, “
A Random Pore Model for Fluid-Solid Reactions: I. Isothermal, Kinetic Control
,”
AIChE Journal
26
, no.
3
(
1980
): 379–386.
20.
Gavals
G. R.
, “
A Random Capillary Model with Application to Char Gasification at Chemically Controlled Rates
,”
AIChE Journal
26
, no.
4
(
1980
): 577–585.
21.
Avrami
M.
, “
Kinetics of Phase Change. I General Theory
,”
Journal of Chemical Physics
7
(
1939
): 1103,
22.
Kolmogorov
A. N.
, “
On the Statistical Theory of the Crystallization of Metals
,”
Bulletin of the Russian Academy of Sciences: Math Series
1
(
1937
): 355–359.
23.
Johnson
W. A.
and
Mehl
R. F.
, “
Reaction Kinetics in Processes of Nucleation and Growth
,”
Transactions of the AIME
135
(
1939
): 396–415.
24.
Hobson
D. O.
, MHTGR Program Annual Report for January 1, 1989, through June 30, 1993, DOE-HTGR-90-389, ORNL-6779 (Oak Ridge, TN:
Oak Ridge National Laboratory
,
1994
),
25.
Wichner
R. P.
and
Ball
S. J.
,
Potential Damage to Gas Cooled Graphite Reactors Due to Severe Accidents
, ORNL/TM-13661 (
Oak Ridge, TN
:
Oak Ridge National Laboratory
,
1999
).
26.
Fuller
E. L.
and
Okoh
J. M.
, “
Kinetics and Mechanisms of the Reaction of Air with Nuclear Grade Graphites: IG-110
,”
Journal of Nuclear Materials
240
, no.
3
(
1997
): 241–250.
27.
Mohamed
E.-G.
and
Tournier
J.-M.
P.
, “
Comparison of Oxidation Model Predictions with Gasification Data of IG-110, IG-430 and NBG-25 Nuclear Graphite
,”
Journal of Nuclear Materials
420
, nos.
1-3
(
2012
): 141–158.
28.
Xu
W.
,
Shi
L.
, and
Zheng
Y.
, “
Transient Analysis of Nuclear Graphite Oxidation for High Temperature Gas Cooled Reactor
,”
Nuclear Engineering and Design
306
(
2016
): 138–144.
29.
Xiaowei
L.
,
Xiaoyu
Y.
,
Suyuan
Y.
, and
Jean-Charles
R.
, “
Analysis of Graphite Gasification by Water Vapor at Different Conversions
,”
Nuclear Engineering and Design
273
(
2014
): 68–74.
30.
Paul
R. M.
, “
Application of a Three-Dimensional Random Pore Model for Thermal Oxidation of Synthetic Graphite
,”
Journal of Nuclear Materials
543
(
2021
): 152589,
31.
Paul
R. M.
and
Morral
J. E.
, “
A 3D-Random Pore Model for the Oxidation of Graphite with Closed Porosity
,”
Journal of Nuclear Materials
509
(
2018
): 425–434.
32.
Paul
R. M.
and
Morral
J. E.
, “
A 3D Random Pore Model for the Oxidation of Graphite with Open Porosity
,”
Journal of Nuclear Materials
499
(
2018
): 344–352.
33.
Paul
R. M.
,
Arregui-Mena
J. D.
,
Contescu
C. I.
, and
Gallego
N. C.
, “
Effect of Microstructure and Temperature on Nuclear Graphite Oxidation Using the 3D Random Pore Model
,”
Carbon
191
(
2022
): 132–145.
34.
Oh
C. H.
,
Kim
E. S.
,
No
H. C.
, and
Cho
N. Z.
, Final Report on Experimental Validation of Stratified Flow Phenomena, Graphite Oxidation, and Mitigation Strategies of Air Ingress Accidents (Idaho Falls, ID:
Idaho National Laboratory
,
2011
),
35.
Hinssen
H. K.
,
Kühn
K.
,
Moormann
R.
,
Schlögl
B.
,
Fechter
M.
, and
Mitchell
M.
, “
Oxidation Experiments and Theoretical Examinations on Graphite Materials Relevant for the PBMR
,”
Nuclear Engineering and Design
238
, no.
11
(
2008
): 3018–3025.
36.
Olasov
L. R.
,
Zeng
F. W.
,
Spicer
J. B.
,
Gallego
N. C.
, and
Contescu
C. I.
, “
Modeling the Effects of Oxidation-Induced Porosity on the Elastic Moduli of Nuclear Graphites
,”
Carbon
141
(
2019
): 304–315.
37.
Matthews
A. C.
,
Kane
J. J.
,
Swank
W. D.
, and
Windes
W. E.
, “
Nuclear Graphite Strength Degradation under Varying Oxidizing Conditions
,”
Nuclear Engineering and Design
379
(
2021
): 111245,
38.
Windes
W. E.
,
Burchell
T. D.
, and
Davenport
M.
, “
The Advanced Reactor Technologies (ART) Graphite R&D Program
,”
Nuclear Engineering and Design
362
(
2020
): 110586,
39.
Standard Test Method for Compressive Strength of Carbon and Graphite
, ASTM C695-21 (
West Conshohocken, PA
:
ASTM International
, approved May 1,
2021
),
40.
Standard Test Method for Linear Thermal Expansion of Solid Materials With a Push-Rod Dilatometer
, ASTM E228-17 (
West Conshohocken, PA
:
ASTM International
, approved April 1,
2017
),
41.
Standard Test Method for Moduli of Elasticity and Fundamental Frequencies of Carbon and Graphite Materials by Sonic Resonance
, ASTM C747-16 (
West Conshohocken, PA
:
ASTM International
, approved October 1,
2016
),
42.
Standard Test Method for Thermal Diffusivity of Carbon and Graphite by Thermal Pulse Method
, ASTM C714-17 (
West Conshohocken, PA
:
ASTM International
, approved May 1,
2017
),
43.
Standard Test Method for Thermal Diffusivity by the Flash Method
, ASTM E1461-13 (
West Conshohocken, PA
:
ASTM International
, approved September 1,
2013
),
44.
Standard Test Method for Flexural Strength of Manufactured Carbon and Graphite Articles Using Four-Point Loading at Room Temperature
, ASTM C651-20 (
West Conshohocken, PA
:
ASTM International
, approved May 1,
2020
),
45.
Standard Test Method for Flexural Strength of Manufactured Carbon and Graphite Articles Using Three-Point Loading at Room Temperature
, ASTM D7972-14(2020) (
West Conshohocken, PA
:
ASTM International
, approved May 1,
2020
),
46.
Standard Test Method for Tensile Stress-Strain of Carbon and Graphite
, ASTM C749-15(2020) (
West Conshohocken, PA
:
ASTM International
, approved May 1,
2020
),
47.
Standard Test Method for Tensile Strength Estimate by Disc Compression of Manufactured Graphite
, ASTM D8289-20 (
West Conshohocken, PA
:
ASTM International
, approved May 1,
2020
),
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