Specimen Geometry Effects on Oxidation Behavior of Nuclear Graphite
(주)코리아스칼라
- 최초 등록일
- 2016.04.02
- 최종 저작일
- 2006.09
- 5페이지/ 어도비 PDF
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서지정보
ㆍ발행기관 : 한국탄소학회
ㆍ수록지정보 : Carbon letters / 7권 / 3호
ㆍ저자명 : Kwang-Youn Cho, Kyung-Ja Kim, Yun-Soo Lim, Yun-Joong Chung, Se-Hwan Chi
영어 초록
Graphite has hexagonal closed packing structure with two bonding characteristics of van der Waals bonding between the carbon layers at c axis, and covalent bonding in the carbon layer at a and b axis. Graphite has high tolerant to the extreme conditions of high temperature and neutron irradiations rather than any other materials of metals and ceramics. However, carbon elements easily react with oxygen at as low as 400C. Considering the increasing production of today of hydrogen and electricity with a nuclear reactor, study of oxidation characteristics of graphite is very important, and essential for the life evaluation and design of the nuclear reactor. Since the oxidation behaviors of graphite are dependent on the shapes of testing specimen, critical care is required for evaluation of nuclear reactor graphite materials. In this work, oxidation rate and amounts of the isotropic graphite (IG-110, Toyo Carbon), currently being used for the Koran nuclear reactor, are investigated at various temperature. Oxidation process or principle of graphite was figured out by measuring the oxidation rate, and relation between oxidation rate and sample shape are understood. In the oxidation process, shape effect of volume, surface area, and surface to volume ratio are investigated at 600℃, based on the sample of ASTM C 1179-91.
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