Journal of the Society of Powder Technology, Japan
Online ISSN : 1883-7239
Print ISSN : 0386-6157
ISSN-L : 0386-6157
Search
Advanced search
OR
Browse
Search
Volume 28, Issue 11
Displaying 1-6 of 6 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • The Surface-treatment of Ceramic Powders through Pulverization in a Reactive Atmosphere by Means of Ball Mill (IV)
    Surface-treatment of Silicon Carbide
    Noboru SUZUKI, Yutaka GO, Noriyuki BABA, Jiro ITO, Atsushi ENDO, Hiros ...
    1991 Volume 28 Issue 11 Pages 670-678
    Published: November 10, 1991
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.28.670
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The surface properties of silicon carbides pulverized in n-hexane and n-hexane solutions of cetanol or octadecyltriethoxysilane were investigated through their dispersive properties, by scanning electron micrographs (SEM), infrared absorption spectra, pyrolysis and the number of surface groups estimated from carbon contents and surface areas. The following were confirmed: (1) The surface nature of silicon carbide pulverized in n-hexane was hydrophilic and was similar to that of unpulverized silicon carbide. The surface nature of silicon carbide pulverized in an n-hexane solution of cetanol appeared to be hydrophilic, but it was hydrophobic in comparison with that of unpulverized silicon carbide. The surface nature of silicon carbide pulverized in an n-hexane solution of octadecyltriethoxysilane appeared to be hydrophobic (2) The pulverization was confirmed by SEM to proceed with increase in grinding time. (3) The characteristic absorption due to surface groups was observed in that of silicon carbide pulverized in n-hexane solutions of cetanol or octadecyltriethoxysilane. The vapors evolved by the pyrolysis of the surface group were observed. (4) The surface-treatment of silicon carbide was confirmed to be performed by pulverization in n-hexane solutions of cetanol or octadecyl-triethoxysilane. (5) The reaction mechanisms were confirmed to be,
    View full abstract
    Download PDF (2105K)
  • The Trajectory of a Particle
    Inertial Classification
    Hiroyuki UENO
    1991 Volume 28 Issue 11 Pages 679-683
    Published: November 10, 1991
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.28.679
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The objective of inertial classification facilities is to classify the particles which follow the flow well and particles which do not. The flow in which the vertical flowing direction is slightly bent to the right side, and thereafter, largely bent to the left side is taken up. Moreover, the flow which utilizes von Karman's vortex street and that which changes the extent of meandering slightly in the course of time is also taken up.
    At the first change in the flowing direction, the particle trajectories which follow the flow well and those which do not can be identified. However, when the effect of the next change in the flowing direction is exerted on them, the tracks of both particles may not be able to be identified clearly.
    View full abstract
    Download PDF (502K)
  • The Relationship between the Pore Characteristics and the Suctionability of a Gypsum Mold
    Leng LI, Bing hwa WANG, Masafumi ARAKAWA
    1991 Volume 28 Issue 11 Pages 684-688
    Published: November 10, 1991
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.28.684
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The objective of the present investigation was to understand the relationship between the pore structure of gypsum mold and suctionability as a function of the water/plaster ratio in the hydrate reaction of plaster. Nine kinds of gypsum mold, which have different water ratios of hydration, were used.
    The relationship between the pore characteristics and suctionability of molds were analysed considering the structural difference of the micropores in gypsum molds.
    It was found that the pore volume and mean pore size increase as the water volume in hydration increased, however, pore size distribution gave a different pattern. That is, volume fraction of the micropore under 1μm in total pore volume decreased as the water/plaster ratio increased, and the bimodal distribution changed into a unimodal shape.
    Therefore, the suction pressure gave the maximum value for the gypsum sample which was obtained what water was added to 80, 90g with 100g plaster at the reaction of hydration.
    View full abstract
    Download PDF (548K)
  • Production of Sustained Release Microspheres Coated with Inorganic Fine Particles
    Eiichi ABE, Noriyuki YAMADA, Hideharu HIROSUE
    1991 Volume 28 Issue 11 Pages 689-693
    Published: November 10, 1991
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.28.689
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Producing sustained release micropheres was tried by coating a drug with inorganic fine particles. Magnesium carbonate in a tumbling fluidized bed was coated with two sorts of colloidal silica having a size of about 60-90nm and a size less than 6nm. It was confirmed experimentally by varying the size of colloidal silica, by varying the mixing ratio of two different-sized colloidal silica and by using a coating mass, that microspheres having different release rates.
    View full abstract
    Download PDF (527K)
  • A Big Hour Glass
    Perfect Flowing through the Small Oriffice
    Yasumaro SHIWA
    1991 Volume 28 Issue 11 Pages 694-701
    Published: November 10, 1991
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.28.694
    JOURNAL FREE ACCESS
    Download PDF (5879K)
  • [title in Japanese]
    Shin DOI
    1991 Volume 28 Issue 11 Pages 715-717
    Published: November 10, 1991
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.28.715
    JOURNAL FREE ACCESS
    Download PDF (366K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top