JOPSS - Search Results

Journal Articles

Oxidation processes of copper-gold alloy surface induced by supersonic oxygen molecular beam

Okada, Michio*; Tsuda, Yasutaka*; Yoshigoe, Akitaka; Dio, W. A.*

Do To Dogokin, 56(1), p.232 - 236, 2017/00

We reported the our studies on the surface temperature (Ts) dependence of oxidation on the Cu $_{3}$ Au(111) surface by a supersonic O $_{2}$ molecular beam, using synchrotron radiation X-ray photoemission spectroscopy. Clean surface shows strong Au segregation to the top layer, i.e., Au surface enrichment of the clean surface. Complete Cu segregation to the surface occurs at 0.5 ML O surface coverage. The Au-rich second and third layers of the oxidized surface demonstrate the protective layer formation against oxidation deeper into the bulk. We found that Cu $_{2}$ O formation occurs. At Ts = 300K, the Cu $_{2}$ O growth is not so effective. The surface oxidation is less effective on Cu $_{3}$ Au(111) than on Cu(111). At Ts = 400K, the protection by the Au-rich layer against oxidation into bulk is effective. At Ts = 500K, the Au protective layer is broken due to effective Au diffusion and thus Cu $_{2}$ O grows deeper into bulk.

JAEA Reports

Development of bonding techniques for cryogenic components, 2; HIP bonding between Cu alloys and Ti, cryogenic stainless steels

Saito, Shigeru; Ouchi, Nobuo; Fukaya, Kiyoshi*; Ishiyama, Shintaro; Tsuchiya, Yoshinori; Nakajima, Hideo

JAERI-Tech 2003-027, 63 Pages, 2003/03

JAERI-Tech-2003-027.pdf:19.84MB

Around the super conducting (SC) coils of SC linear accelerator or fusion reactor, several kind of dissimilar materials bond will be needed. In recent years, pure titanium has been proposed as jacket material for SC coil of fusion reactor. Cu-alloys will be used for connection of SC coils. Cryogenic stainless steels have been development for structural material. Therefore, it is necessary to develop new bonding techniques and we started the bonding technology development by hot isostatic press (HIP) method to bond Cu-alloys with titanium and cryogenic stainless steels. In this experiments, optimization of HIP bonding condition and evaluation of bonding strength by metallurgical observation, tensile and bending tests were performed.

JAEA Reports

Development of bonding techniques between W and Cu-alloys for plasma facing components by HIP method, 3; Bonding tests with Au-foil insert

Saito, Shigeru; Fukaya, Kiyoshi*; Ishiyama, Shintaro

JAERI-Tech 2002-058, 30 Pages, 2002/07

JAERI-Tech-2002-058.pdf:2.56MB

no abstracts in English

Journal Articles

Fundamental study on in-situ repair technique of armor tiles for fusion experimental reactors

Ishiyama, Shintaro; Baba, Shinichi; Fukaya, Kiyoshi; Eto, Motokuni; Akiba, Masato; Sato, Makoto*; Araki, Toshimitsu*; Yamaguchi, Seiji*; Yamazaki, Seiichiro*

Nihon Genshiryoku Gakkai-Shi, 42(7), p.669 - 677, 2000/07

no abstracts in English

Journal Articles