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Volume 46, Issue 7
Displaying 1-8 of 8 articles from this issue
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Effect of Water Glass Component of Inner Coating Material on Gas DesorptionMasao HASHIBA, Yuko HIROHATA, Tomoaki HINO, Hidekazu YAMADA, Akio KOID ...2003 Volume 46 Issue 7 Pages 539-541
Published: July 20, 2003
Released on J-STAGE: October 20, 2009
JOURNAL FREE ACCESSFor two types of inner coating materials with different component of water glass, the gas desorption properties were measured by using thermal desorption spectroscopy.
The major outgassing species during the heating up to 773 K were CO2 and H2O in both types. In the thermal desorption spectra of CO2 and H2O, a large desorption peak was observed at approximately 400 K. The total desorption amount of CO2 and H2O for the (A + B) type with the water glass, (K2O + Li2O) ·3.8SiO2·4H2O, was approximately a half of that of the A type with the water glass, K2O·3.8SiO2·4H2O. The (A + B) type can reduce both the baking temperature and the pumping time in the manufacturing process of cathod ray tube, compared to the A type.View full abstractDownload PDF (388K) -
Nobuyuki HAYASHI, Kuei-Yi LEE, Takashi IKUNO, Keita TSUJI, Shigeharu O ...2003 Volume 46 Issue 7 Pages 542-545
Published: July 20, 2003
Released on J-STAGE: October 20, 2009
JOURNAL FREE ACCESSWe have synthesized highly aligned carbon nanotubes (CNTs) assembling density-controlled catalyst nanoparticles. The CNTs were grown on Fe or Ni catalyst nanoparticles by RF magnetron sputtering. Structural characterization of the nanoparticles and the CNTs were performed by SEM and TEM. It was found that the densities of both nanoparticles and CNTs were controlled within the ranges of 1081010/cm2. The density of CNTs almost corresponds to that of the catalyst nanoparticles, and which indicates that the catalyst nanoparticles are the nuclei of the CNTs growth.View full abstractDownload PDF (1097K) -
Yasuhiro YAMAUCHI, Michiko YOSHITAKE, Weijie SONG2003 Volume 46 Issue 7 Pages 546-549
Published: July 20, 2003
Released on J-STAGE: October 20, 2009
JOURNAL FREE ACCESSWe investigated the surface morphology, natures of chemical bond and thickness of oxide film grew on the Cu-9%Al (111) single crystal by means of Auger electron spectroscopy (AES) and a scanning electron microscopy (SEM). By introducing 1300L oxygen at 725°C, aluminum was oxidized and copper was not, and the epitaxial alumina film grew on the Cu-9%Al surface. The alumina surface showed two morphologies in SEM image. One was a flat surface with a few small defects, and the other was a rough surface which had smooth and rough regions. The rough surface was remarkably seen in sputtered region to obtain clean surface. The alumina film whose thickness was about 3.5 nm uniformly grew on the flat surface, and the thickness was about 3.03.5 nm on rough surface. It is concluded that the surface roughness in alumina is related to the roughness of clean surface. Therefore, to grow the uniform alumina film over large area of Cu-9%Al surface, it is essential to obtain the flat clean surface prior to oxidation.View full abstractDownload PDF (878K) -
Katsuyuki ISHIZU, Yasuhito GOTOH, Hiroshi TSUJI, Junzo ISHIKAWA2003 Volume 46 Issue 7 Pages 550-553
Published: July 20, 2003
Released on J-STAGE: October 20, 2009
JOURNAL FREE ACCESSAn Fowler-Nordheim plotter and Seppen-Katamuki plotter is an analyzer which displays electron emission properties (F-N plot and S-K plot) on cathode ray tube of oscilloscopes in order to understand the changes in properties of a field emitter during the measurement. In this article design and development of this in situ analyzer is described. In situ display of an F-N plot and S-K plot of a tungsten field emitter was demonstrated. As a result, an F-N plot and S-K plot was displayed on the spot.View full abstractDownload PDF (721K) -
Michiko YOSHITAKE, Thananan AKHADEJDAMRONG, Tatsuhiko AIZAWA2003 Volume 46 Issue 7 Pages 554-558
Published: July 20, 2003
Released on J-STAGE: October 20, 2009
JOURNAL FREE ACCESSThe Cl+ ion implantation to TiN film resulted in low friction coefficient of TiN film against a stainless steel ball. The mechanism of reduction of the friction coefficient by Cl+ implantation was studied with XPS from a viewpoint of surface reaction. The surface oxygen concentration was high for the specimen with low friction. The formation of titanium dioxide with oxygen defects was concluded to be important. Titanium dioxide with oxygen defects works as a lubricant. The titanium dioxide was worn away during friction. The re-production of the titanium dioxide is important for continuous low friction. The re-production of the titanium dioxide was controlled by the supply of oxygen from water vapor in the atmosphere and friction heat. This is the reason why the friction behavior largely depended on the friction speed.View full abstractDownload PDF (684K) -
Jun-ichi SATO, Hitoshi NAGASAKI, Takashi MIURA, Takato HIRAYAMA, Ichir ...2003 Volume 46 Issue 7 Pages 559-562
Published: July 20, 2003
Released on J-STAGE: October 20, 2009
JOURNAL FREE ACCESSWe have developed a laser-plasma vacuum ultraviolet light source (LPLS) for the purpose of using it as an excitation light source in experimental studies of Desorption Induced by Electronic Transitions (DIET). In comparison with the synchrotron light source, LPLS has an advantage of being intense in short duration. The pulse width of the order of 10 ns makes it possible to obtain higher time resolution in a time-of-flight measurement of desorbed particles.View full abstractDownload PDF (538K) -
Motohiro YAMADA, Masahiro FUKUMOTO, Toshiaki YASUI2003 Volume 46 Issue 7 Pages 563-566
Published: July 20, 2003
Released on J-STAGE: October 20, 2009
JOURNAL FREE ACCESSIn recent years, silicon nitride has received great interest for its excellent properties. Especially for high temperature applications and resistance of wear and corrosion, silicon nitride coating might contribute to the durability of various structural parts. However, fabrication of silicon nitride coating by conventional spraying techniques causes difficulties of its decomposition without a stable melting phase. In this research, the reactive Radio Frequency (RF) plasma spraying, which can fabricate nitride ceramic coatings, was used. Adding hydrogen as reactive plasma gas with argon and nitrogen improves nitridation significantly. Without hydrogen gas, we can't obtain the silicon nitride coating. The nitriding mechanism is that gaseous nitrogen diffuses to liquid silicon, which melts on the substrate, then Si3N4 coating forms. On an influence of hydrogen addition, we supposed that hydrogen removes an oxide layer on the silicon particles and/or improves thermal efficiency of plasma.View full abstractDownload PDF (672K) -
Takahiro JINUSHI, Masao HASHIBA, Yuji YAMAUCHI, Yuko HIROHATA, Tomoaki ...2003 Volume 46 Issue 7 Pages 567-570
Published: July 20, 2003
Released on J-STAGE: October 20, 2009
JOURNAL FREE ACCESSPermeability of helium gas in SiC fiber reinforced SiC composite (SiC/SiC composite) was measured by using a vacuum apparatus consisting two chambers. The SiC/SiC samples were prepared by different methods; polymer infiltration and pyrolysis (PIP), PIP and melt impregnation (MI), hot pressing (HP) and liquid phase sintering (LPS). The measurement of permeability was carried out with pressure of helium ranging from 102 to 105 Pa at room temperature. The permeability of the sample made by LPS method was several orders of magnitude lower than those of the other SiC/SiC composites. The lowest permeability, 4 × 10-11 m2s-1, was observed for the SiC/SiC composite made by LPS using SiC fibers and nano powder of β-SiC. The largest permeability, 5 × 10-5 m2s-1, was observed for the SiC/SiC composite made by PIP. The permeability of the SiC/SiC composite depended on the structures of fiber bundle and matrix, and roughly corresponded to the microscopic structures, i.e. pores and cracks.View full abstractDownload PDF (947K)
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