Journal of the Society of Powder Technology, Japan
Online ISSN : 1883-7239
Print ISSN : 0386-6157
ISSN-L : 0386-6157
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Volume 29, Issue 3
Displaying 1-13 of 13 articles from this issue
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  • [title in Japanese]
    Hiroshi UTSUGI
    1992 Volume 29 Issue 3 Pages 161
    Published: March 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.161
    JOURNAL FREE ACCESS
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  • Preparation of Semiconductive In2O3-SnO2 Fine Powder by Mechano-chemical Reaction
    Haruhisa SHIOMI, Shingo AKITA, Masahiko NAKAMURA
    1992 Volume 29 Issue 3 Pages 162-167
    Published: March 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.162
    JOURNAL FREE ACCESS
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    Semiconductive In2O3-SnO2 fine powder was prepared by a mechano-chemical reaction during ball-milling which has recently been given increasing attention as a technique for the surface modification of powders or the preparation of functional composite powders. In the present investigation, preparations of sample powders were undertaken by using a pot mill and balls composed of ZrO2 partially stabillized with Y2O3 in order to avoid contamination from milling tools. The effects of the crystallinity of the starting host (In2O3) and of dopant (SnO2) oxide on the doping reaction of SnO2 into In2O3 and the electrical resistance of the ball-milled powder were discussed. The characterization of the ball-milled powder was carried out by BET specific surface area measurements, X-ray powder diffraction, wavelength dispersive X-ray micro-analysis and DC electrical resistance measurement of the powder compact. It has been experimentally confirmed that the degree of the doping reaction and the electrical resistance of the ball-milled powder were influenced by the crystallinity of the host and of the dopant starting materials.
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  • The process of Ultra-fine Grinding of Titania Accompanied by Simultaneous Surface Treatment in a Media-agitating Mill
    Kunio UCHIDA, Kunio KAMIYA, Noboru ASOH, Fumikazu IKAZAKI
    1992 Volume 29 Issue 3 Pages 168-172
    Published: March 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.168
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    Ultra-fine grinding of titania accompanied by simultaneous surface treatment was conducted in a laboratory-scale media agitating mill. The grinding solvent was n-decane, and stearic acid was added to the solvent as the surfactant. Zirconia beads of 0.6mm diameter were used as the grinding media. The effect of grinding time on the characteristics of titania commimuted in the media agitating mill was investigated. The measured characteristics were true density, specific surface area, particle size distribution, crystallite size, crystal lattice distortion and morphology of the comminuted titania. The amount of contamination of the comminuted titania from the grinding media, rotator and mill wall was also measured.
    Titania became flaky by surface attrition during the initial stage of grinding. Subsequently, the flaky particles were ground into ultra-fine particles. The comminuted titania had low crystal lattice distortion in the order of 10-4 and a small crystallite size of less than 200Å after 5 hours of grinding. The true density of the comminuted titania was almost the same as that of intact titania. There was almost no increase in the background intensity in the XRD profile, and the lattice constant of the comminuted titania was kept constant.
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  • Wet Coating of Fine Particles on PSL Particles by Heterocoagulation
    Tohru NIIDA, Yasuo KOUSAKA, Masaya TSUGOSHI, Yasunobu NISHIE, Yoshiyuk ...
    1992 Volume 29 Issue 3 Pages 173-179
    Published: March 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.173
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    A fundamental experimental study of the alternation and modification of particle characteristics has been carried out by the use of a small scale vessel with a stirrer for a suspension of polystyrene latex (PSL) particles (2μm in diameter) as the carrier and magnetite particles (0.23μm in diameter) as a coating material. The qualitative maps of the progressive coating on the carrier surface by fines have been depicted along the variation of operational conditions, such as concentrations and the concentration ratio of each component in the suspension, pH, stirring speed, and agitation period among others. The number distribution of fines coated on a carrier has been correlated through sedimentation velocity data and by the equations which give the relationship between the terminal settling velocity and the composition of the component particles in each coated particle. The results show that the number of fines coated on a carrier is about 114 and has a rather narrow distribution.
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  • The Effect of Powder Treatment Conditions on the Thermal Conductivity of Nylon Coated AlN
    Junko TAKADA, Hiroshi SHINGU
    1992 Volume 29 Issue 3 Pages 180-184
    Published: March 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.180
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    AlN powder is thermodynamically unstable in aqueous systems. Polyamide (Nylon) coating on the surface of an AlN particle can confer a great degree of water-resistability on the AlN powder. In this study, some experimental conditions in the Nylon coating process were varied and examined in relationship to thermal conductivity of the sintered AlN bodies. Thermal conductivity of a sintered body made from Nylon coated AlN powder was under the influence of coupling agents. The coupling agent containing silicon was very effective in decreasing thermal conductivity of the sintered AlN body. Al5Y3O12 was detected by XRD analysis in the low thermal conductive AlN body.
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  • The Surface-treatment of Boron Nitride and its Surface Properties
    Noboru SUZUKI, Noriyuki BABA, Hiroo NAOI, Toshimitsu KOITABASHI, Atsus ...
    1992 Volume 29 Issue 3 Pages 185-189
    Published: March 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.185
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    The surface-treatment of boron nitride with cetanol (Cet), octadecyltri-ethoxysilane (ODTEOS), aminopropyltriethoxysilane (APTEOS) and isopropyl-triisostearoyl-titanate (IPTIST) was investigated by studying its dispersive and pyrolytic properties, and by using Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy, the X-ray diffraction method and the number of surface groups. From these results, the followings were recognized: (1) The surfaces of boron nitride could effectively be surface-treated by the reflux method with those reagents; and (2) The surface groups were percieved to be the ones which chemically bonded with the surface of boron nitride.
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  • Flow Rates and Pressure Drops Through the Packed Beds of Surface Treated Particles
    Atsushi ENDO, Minori IMAZU, Kazutoshi HASEGAWA, Hiroshi TOHGOH, Yuhkei ...
    1992 Volume 29 Issue 3 Pages 190-193
    Published: March 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.190
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    The influence of surface treatment was studied by observing liquid flow rates and pressure drops through various beds of chemical treated particles. The results were examined by using the Kozeny-Carman equation. It was found that the relationship between flow rates and pressure drops through the packed beds of chemically treated particles were different from those through the beds of untreated particles.
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  • Mechanochemical Effect on Diffusion of Atoms and Molecules at the Surface Layer of Powder Particles
    Akiko IKEKAWA
    1992 Volume 29 Issue 3 Pages 194-198
    Published: March 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.194
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  • Study of Catalyst Surfaces by Scanning Tunneling Microscopy
    Recent Topics
    Masaharu KOMIYAMA
    1992 Volume 29 Issue 3 Pages 199-205
    Published: March 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.199
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  • Plasma Treatment and Thermally Stimulated Exoelectron Emission
    Yoshihiro MOMOSE
    1992 Volume 29 Issue 3 Pages 206-210
    Published: March 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.206
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  • [title in Japanese]
    [in Japanese]
    1992 Volume 29 Issue 3 Pages 211-230
    Published: March 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.211
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  • [title in Japanese]
    1992 Volume 29 Issue 3 Pages 230
    Published: March 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.230
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1992 Volume 29 Issue 3 Pages 231-232
    Published: March 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.231
    JOURNAL FREE ACCESS
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