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Ishihara, Masahiro; Hanawa, Satoshi; Sogabe, Toshiaki; Tachibana, Yukio; Iyoku, Tatsuo
Materials Science Research International, 10(1), p.65 - 70, 2004/04
no abstracts in English
Sogabe, Toshiaki; Ishihara, Masahiro; Baba, Shinichi; Tachibana, Yukio; Yamaji, Masatoshi*; Iyoku, Tatsuo; Hoshiya, Taiji*
Materials Science Research International, 9(3), p.235 - 241, 2003/09
2D-C/C composite is one of the promising materials as a next-generation core material in gas-cooled reactors. Effect of air-oxidation on the thermal diffusivity up to 1673K of the 2D-C/C composite was investigated. The C/C composite specimens for measurement of thermal diffusivity were oxidized from 1 to 11 percent weight loss in air at 823K. Thermal diffusivity at room temperature declined 10
20 percent for parallel to lamina direction and 59 percent for that of perpendicular within 11 percent weight loss by oxidation. Thermal diffusivity tended to decrease gradually as the increase of oxidation loss in parallel to lamina, however, it decreased in the beginning of oxidation pretty much and not so changed by further oxidation loss in perpendicular to lamina. Change in thermal conductivity under oxidation condition was also estimated.
Nagae, Yuji; Aoto, Kazumi
Materials Science Research International, 0 Pages, 2002/05
A study on non-destructive teshnique for creep damage of Type 304stainless steel was performed. In study, the magnetic field change in consideredas the non-destructive teshnique. This technique has possibility that the damage before crack initiation isdetected. We report the results on the magnetic field change during creep damage progress,in order to examine the applicabil
Hayashi, Makoto*; Okido, Shinobu*; Morii, Yukio; Minakawa, Nobuaki
Materials Science Research International, Special Technical Publication, 1, p.418 - 423, 2001/05
no abstracts in English
Akiniwa, Yoshiaki*; Tanaka, Keisuke*; Minakawa, Nobuaki; Morii, Yukio
Materials Science Research International, Special Technical Publication, 1, p.427 - 430, 2001/05
no abstracts in English
Okido, Shinobu*; Hayashi, Makoto*; Morii, Yukio; Minakawa, Nobuaki
Materials Science Research International, Special Technical Publication, 1, p.435 - 438, 2001/05
no abstracts in English
Yamashita, Masato*; Konishi, Hiroyuki; Takahashi, Masamitsu; Mizuki, Junichiro; Uchida, Hitoshi*
Materials Science Research International, Special Technical Publication, 1, p.398 - 401, 2001/05
A rust layer on a weathering low-alloy steel has strong protective ability for atmospheric corrosion of the steel. In order to control the rust layer on steels, it is so important to know the detailed structure of rust and relate it to the protective ability of the rust layer. Especially, the position of atoms of the alloying elements in the rust layer directly control the structure and properties of the rust layer. We tried to find the atomic arrangement of the rust layer of Fe-Cr alloy film covered with thin film of electrolyte using synchrotron radiation. Grazing incidence X-ray diffraction and M
ssbauer spectra showed that the rust layer was composed of 
-FeOOH and ultra-fine 
-FeOOH. By examining EXAFS spectra, Cr coming from Fe-Cr alloy film would be present in the -FeOOH. Some of Cr would be present between Fe-0-OH octahedron as interstitial atoms, as well as substituting Fe lattice site in the octahedron.