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 42, Issue 4
Displaying 1-6 of 6 articles from this issue
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  • Effect of Granule Compaction Procedures of Aluminum Nitride on the Properties of Green Body and Resultant Ceramics
    Hiroya Abe, Kazuyoshi Sato, Makio Naito, Kiyoshi Nogi, Tadashi Hotta, ...
    2005 Volume 42 Issue 4 Pages 238-243
    Published: April 10, 2005
    Released on J-STAGE: July 01, 2010
    DOIhttps://doi.org/10.4164/sptj.42.238
    JOURNAL FREE ACCESS
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    The effect of granule compaction procedures of aluminum nitride on the properties of green body and the resultant ceramics were examined. Aluminun nitride granules were uniaxially pressed, and then three kinds of pressing procedures were applied. As a result, the fracture strength of sintered body was changed depending on CIP and dewaxing procedures. Higher pressure of CIP resulted in higher fracture strength of ceramics. However, the fracture toughness and thermal conductivity of ceramics did not change with the compaction procedures as long as the microstructure and density of ceramics were the same. The difference in fracture strength was caused by the size of defects in the sintered body, which was observed through the thinned specimen in transmission mode of optical microscope. The defect size changed with the CIP/dewaxing procedures as well as the pressure of CIP. Since the dewaxed granules had higher compressive strength than the waxed granules, the larger defects within the ceramics occurred when the dewaxing of green body was conducted prior to CIP.
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  • Influence of Glass Particle Property for Glass-ceramics Layer upon Sintering of the Sandwich Substrate with Inner-constraining Particles Layer
    Shuya Nakao, Masaru Kojima, Kenji Tanaka
    2005 Volume 42 Issue 4 Pages 244-251
    Published: April 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.244
    JOURNAL FREE ACCESS
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    Constrained sintering of the substrate with sandwich structure, which was laminated inner-constraining alumina layer between glass-alumina mixed layers, has been studied. The influence of the particle size of glass for glass-alumina mixed layer upon firing shrinkage was investigated.
    Shrinkage for constrained sintering depended on the cumulative total pore volume. The penetration length of glass into alumina layer depended on the ratio of alumina particle size to glass particle size.
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  • Preparation of MoS2 Catalyst for Ultra-deep Desulfurization of Diesel Oil by a Media Agitation Mill
    Effect of Circumstance Pressure in Grinding Mill
    Kunio Uchida, Masato Kouzu, Fumikazu Ikazaki, Shigehisa Endoh
    2005 Volume 42 Issue 4 Pages 252-256
    Published: April 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.252
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    Effect of circumstance pressure in mill on comminution of molybdenum sulfide (MoS2) used for hydro-desulfurization (HDS) catalyst was investigated. MoS2 was prepared in argon at a pressure between 0.7kPa and 0.2MPa using a media agitation mill with an addition of butanol. Comminuted MoS2 was characterized in crystal structure, specific surface area, pore size distribution and catalytic activity for HDS of dibenzothiophene (DBT). Maximal of specific surface area of MoS2 was obtained by comminution at a pressure of 30kPa. On the other hand, the destruction of layered structure of MoS2 and the volume of micro-pore having a width of 0.4-0.6nm increased with Ar pressure. MoS2 prepared at a high Ar pressure had a high catalytic activity for HDS of DBT. These results suggested that the catalytic activity was influenced by the destruction of layered structure and the generation of micro-pores by mechano-chemical activation.
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  • Measurement of Powder-Particles Flow Using Capacitance Tomography
    Overview and Image Reconstruction Using GVSPM Method
    Masahiro Takei
    2005 Volume 42 Issue 4 Pages 257-264
    Published: April 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.257
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    An electrical capacitance CT is a noninvasive technique with the potential to visualize particle behavior in a cross-section of a multiphase flow pipeline. In this review, firstly, a fundamental structure and overview of the capacitance CT are reviewed. Next, a new reconstruction method called Generalized Vector Sampled Pattern Matching (GVSPM) is explained for resolving an ill-posed inverse problem. This new method is able to achieve stable convergence without the use of an empirical value. This accurate reconstruction is accomplished using an objective function that is calculated as the inner product calculation between the experimental capacitance and the reconstructed image capacitance.
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  • [title in Japanese]
    2005 Volume 42 Issue 4 Pages 269-270
    Published: April 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.269
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  • [title in Japanese]
    Ryoichi Kurose
    2005 Volume 42 Issue 4 Pages 271-274
    Published: April 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.271
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