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Title: Oxidation Behavior of Matrix Graphite and Its Effect on Compressive Strength

Matrix graphite (MG) with incompletely graphitized binder used in high-temperature gas-cooled reactors (HTGRs) is commonly suspected to exhibit lower oxidation resistance in air. In order to reveal the oxidation performance, the oxidation behavior of newly developed A3-3 MG at the temperature range from 500 to 950°C in air was studied and the effect of oxidation on the compressive strength of oxidized MG specimens was characterized. Results show that temperature has a significant influence on the oxidation behavior of MG. The transition temperature between Regimes I and II is ~700°C and the activation energy ( E a ) in Regime I is around 185 kJ/mol, a little lower than that of nuclear graphite, which indicates MG is more vulnerable to oxidation. Oxidation at 550°C causes more damage to compressive strength of MG than oxidation at 900°C. Comparing with the strength of pristine MG specimens, the rate of compressive strength loss is 77.3% after oxidation at 550°C and only 12.5% for oxidation at 900°C. Microstructure images of SEM and porosity measurement by Mercury Porosimetry indicate that the significant compressive strength loss of MG oxidized at 550°C may be attributed to both the uniform pore formation throughout the bulk and the preferential oxidation of the binder.
Authors:
ORCiD logo [1] ;  [2] ;  [1] ; ORCiD logo [1] ;  [1] ;  [2] ;  [2] ;  [1] ;  [1] ;  [1]
  1. Institute of Nuclear and New Energy Technology of Tsinghua Univ., Beijing (China)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Science and Technology of Nuclear Installations
Additional Journal Information:
Journal Volume: 2017; Journal ID: ISSN 1687-6075
Publisher:
Hindawi
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
Language:
English
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
OSTI Identifier:
1399943

Zhou, Xiangwen, Contescu, Cristian I., Zhao, Xi, Lu, Zhenming, Zhang, Jie, Katoh, Yutai, Wang, Yanli, Liu, Bing, Tang, Yaping, and Tang, Chunhe. Oxidation Behavior of Matrix Graphite and Its Effect on Compressive Strength. United States: N. p., Web. doi:10.1155/2017/4275375.
Zhou, Xiangwen, Contescu, Cristian I., Zhao, Xi, Lu, Zhenming, Zhang, Jie, Katoh, Yutai, Wang, Yanli, Liu, Bing, Tang, Yaping, & Tang, Chunhe. Oxidation Behavior of Matrix Graphite and Its Effect on Compressive Strength. United States. doi:10.1155/2017/4275375.
Zhou, Xiangwen, Contescu, Cristian I., Zhao, Xi, Lu, Zhenming, Zhang, Jie, Katoh, Yutai, Wang, Yanli, Liu, Bing, Tang, Yaping, and Tang, Chunhe. 2017. "Oxidation Behavior of Matrix Graphite and Its Effect on Compressive Strength". United States. doi:10.1155/2017/4275375. https://www.osti.gov/servlets/purl/1399943.
@article{osti_1399943,
title = {Oxidation Behavior of Matrix Graphite and Its Effect on Compressive Strength},
author = {Zhou, Xiangwen and Contescu, Cristian I. and Zhao, Xi and Lu, Zhenming and Zhang, Jie and Katoh, Yutai and Wang, Yanli and Liu, Bing and Tang, Yaping and Tang, Chunhe},
abstractNote = {Matrix graphite (MG) with incompletely graphitized binder used in high-temperature gas-cooled reactors (HTGRs) is commonly suspected to exhibit lower oxidation resistance in air. In order to reveal the oxidation performance, the oxidation behavior of newly developed A3-3 MG at the temperature range from 500 to 950°C in air was studied and the effect of oxidation on the compressive strength of oxidized MG specimens was characterized. Results show that temperature has a significant influence on the oxidation behavior of MG. The transition temperature between Regimes I and II is ~700°C and the activation energy (Ea) in Regime I is around 185 kJ/mol, a little lower than that of nuclear graphite, which indicates MG is more vulnerable to oxidation. Oxidation at 550°C causes more damage to compressive strength of MG than oxidation at 900°C. Comparing with the strength of pristine MG specimens, the rate of compressive strength loss is 77.3% after oxidation at 550°C and only 12.5% for oxidation at 900°C. Microstructure images of SEM and porosity measurement by Mercury Porosimetry indicate that the significant compressive strength loss of MG oxidized at 550°C may be attributed to both the uniform pore formation throughout the bulk and the preferential oxidation of the binder.},
doi = {10.1155/2017/4275375},
journal = {Science and Technology of Nuclear Installations},
number = ,
volume = 2017,
place = {United States},
year = {2017},
month = {1}
}