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 31, Issue 8
Displaying 1-7 of 7 articles from this issue
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  • The Synthesis of NiAl Fine Powder from Organometallic Salt Precursors
    Osami ABE, Kazumasa MORIMOTO
    1994 Volume 31 Issue 8 Pages 540-548
    Published: August 10, 1994
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.31.540
    JOURNAL FREE ACCESS
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    Fine powders of intermetallic NiAl have been synthesized through organometallic salt precursors. The precursors were precipitated as mixtures of Al(OH)2(C6H5COO) and [Ni(N2H4)2](C6H5COO)2 in a water-methanol solvent (50:50). The precursors should have features such as: (1) fine particle size, (2) uniform composition, and (3) low agglomeration to prepare fine intermetallic powders. Fine precursors were obtained from a starting solution of high concentration, however, they were an aggregated mixture. From diluted starting solutions, the obatained precursors were inagglomerated and considered to be composite powders, but they had a large particle size. An intermediate mixture of Ni3C, Al2O3, and C was formed by the thermal decomposition of the precursors at 1000°C. NiAl powder formed by the reaction among the decomposition products at 1500°C in an Ar atmosphere. The mechanochemical activation of the precursors using a planetary ball mill promoted the thermal decomposition of the precursors followed by the formation reaction of NiAl. The effect of the activation was marked for the precursor estimated as a composite particle. The activated precursors showed an increase in ESR signal intensity, suggesting that the formation of organic radicals promoted the thermal decomposition and formation of NiAl fine powders.
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  • The Adsorption of Alcohols on Silica Gel from Aqueous Solutions
    Shuhei SHIOJI, Masashi KAWAGUCHI, Yoji OHARA, Kenjiro TOKAMI, Hideo YA ...
    1994 Volume 31 Issue 8 Pages 549-555
    Published: August 10, 1994
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.31.549
    JOURNAL FREE ACCESS
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    The adsorption of alcohol molecules on silica gel was investigated in a wide range of the alcohol concentrations in a water solution. Adsorption isotherms of ethanol and 1-propanol from the aqueous solutions were measured and analyzed in terms of the surface excess amount of adsorption. The composite adsorption isotherms were well expressed by a Dubinin-Radushkevich type equation. The individual isotherm, which was calculated by assuming a simple volume-filling model, showed that the pores of the silica were filled with the alcohol at a mole fraction higher than about 0.8.
    The surface hydroxyl groups of silica gel were partially alkoxylated to the alkoxyl groups even in contact with the alcohol in the presence of water. The number of formed alkoxyl groups increased with increase in the concentration of the alcohol in the solution. The equilibrium constant for the alkoxylation reaction was calculated.
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  • The Flow Properties of a Gas-solid Contactor with Baffle Plates
    Keigo NAGATA, Masaaki NAKAMURA, Naoya YAMAGISHI, Hiroshi YAMAGUCHI, Hi ...
    1994 Volume 31 Issue 8 Pages 556-560
    Published: August 10, 1994
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.31.556
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    The behavior of particles in a gas-solid contactor with regularly arranged baffles has been experimentally studied. In this contactor, solid particles trickle down over the baffles and are spouted into the opening between the baffles by the upflowing gas. The loading and flooding points are observed at critical gas velocities in this apparatus. A definite increase in the solid holdup and residence time of the solid particle is also observed at the loading point, and particles choked the column at the flooding point. These phenomena are similar to a gas-liquid counter current flow in a packed bed. It is concluded that the appratus performs at a high efficiency of gas-solid contact.
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  • A Pneumatic Conveying System for Strongly-adhesive Powders and its Features
    Mitsushi FUTAMURA
    1994 Volume 31 Issue 8 Pages 561-567
    Published: August 10, 1994
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.31.561
    JOURNAL FREE ACCESS
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    Dense-phase pneumatic conveying systems are widely applied to powders, from free-flowing to adhesive ones. However, except for a few systems, it is usually difficult to convey strongly-adhesive powders such as Titanium dioxide and Carbon black, among others.
    In this paper, the physical and mechanical properties of Titanium dioxide and paste-PVC powders, and blowing-off pressures of these powders' plugs were examined to compare with PVC and PTA powders which have fairly good fluidities. Then, the pneumatic conveying tests of these strongly-adhesive powders were carried out by making use of a practical scale line of 25A and 50A pipes a max. of 55m long.
    It was found by this system the conveying state is stable, and the adhesion of the powders in the tank and pipes are at minimized.
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  • Trends of Intelligent Sensor's Development using Electronic Ceramics
    Michihiro MURATA
    1994 Volume 31 Issue 8 Pages 568-575
    Published: August 10, 1994
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.31.568
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Toshio INOUE
    1994 Volume 31 Issue 8 Pages 587-591
    Published: August 10, 1994
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.31.587
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Yoshiyuki ENDO
    1994 Volume 31 Issue 8 Pages 592-594
    Published: August 10, 1994
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.31.592
    JOURNAL FREE ACCESS
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