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Volume 23, Issue 9
Displaying 1-4 of 4 articles from this issue
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Tsutomu TSUKADA, Katsumi UKAI1980 Volume 23 Issue 9 Pages 415-424
Published: September 20, 1980
Released on J-STAGE: September 29, 2009
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Teijiro TAMURA, Takuya HAMAMURA1980 Volume 23 Issue 9 Pages 425-429
Published: September 20, 1980
Released on J-STAGE: September 29, 2009
JOURNAL FREE ACCESSThe coadsorption of nitric oxide, nitrogen, and oxygen on a polycrystalline tungsten filament was studied using flash desorption mass spectroscopy. Oxygen or nitrogen does not adsorb on tungsten saturated with nitric oxide, whereas nitric oxide adsorbs on tungsten saturated with nitrogen or oxygen. The strength of the chemisorption bond between tungsten and adsorbed species becomes weaker in the order of nitric oxide, oxygen and nitrogen. When oxygen is adsorbed on the tungsten surface saturated with nitrogen, the Tp of nitrogen desorption spectrum shifted to a lower temperature.View full abstractDownload PDF (739K) -
Masaaki FUTAMOTO, Shigeyuki HOSOKI, Shigehiko YAMAMOTO, Ushio KAWABE1980 Volume 23 Issue 9 Pages 430-437
Published: September 20, 1980
Released on J-STAGE: September 29, 2009
JOURNAL FREE ACCESSSurface and crystallographic properties of carbon field emitters are studied by field-ion, field emission, and electron microscopies. Three kinds of carbon fibers : whisker-like carbon fiber, commercial carbon fiber, and glassy carbon fiber are used in the experiments.
Microscopic structure of these carbon fibers consists of fine graphite crystals. The fine graphite crystals in the surface layer of carbon field emitter move easily to occupy more stable arrangements and even chipped off from the surface under a high electric field. The mechanical strength of carbon field emitters in high electric fields depends on the boundary binding forces of fine graphite crystals. The geometrical smoothness of emitter surface is characterized by the unique fine structure of carbon fibers.View full abstractDownload PDF (2121K) -
Yoshio OKABE, Masaya IWAKI, Katsuo TAKAHASHI1980 Volume 23 Issue 9 Pages 438-444
Published: September 20, 1980
Released on J-STAGE: September 29, 2009
JOURNAL FREE ACCESSThe concentration profiles of chromium and nickel implanted in pure iron were measured with a secondary ion mass analyzer. The electrochemical properties of implanted iron were investigated by means of a cyclic voltammetry in 0.5M acetate buffer solution (pH5.0±0.1). Chromium, nickel and argon ion implantations have been carried out with doses of 1×10161×1017 ions/cm2 at an energy of 150 keV. The target temperature during ion implantation rised to 180°C from room temperature by the heating effect of ion beam itself. The profile of Cr implanted in pure iron has two peaks; the first peak near the surface and the second peak near the depth predicted by the range theory. However, the first peak was not found in the specimen 1 st-implanted with Ni. The electrochemical properties of Cr implanted iron approach to that of Fe-18% Cr bulk alloy (SUS 430), as the dose increases. The polarization curve of Cr implanted iron with 1×1017 ions/cm2 is almost the same as that of SUS 430. The polarization curve of Ni and Cr implanted iron is similar to that of Fe- 18% Cr- 8% Ni bulk alloy (SUS 304) after annealing at 300°C for 20 min.. These results show that Cr and Ni implanted surface layer is useful for the improvement of corrosion resistance of iron.View full abstractDownload PDF (1141K)
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