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 30, Issue 2
Displaying 1-7 of 7 articles from this issue
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  • The Wear Characteristics of Zirconia Ball in a Grinding Machine
    The Effect of the Type of the Mill, Materials of the Tank and Mechanical Properties
    Kazuyo INUI, Hiroshi OHNISHI, Toshio KAWANAMI
    1993 Volume 30 Issue 2 Pages 80-87
    Published: February 10, 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.30.80
    JOURNAL FREE ACCESS
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    The wear characteristics of ZrO2 balls, which were prepared under several conditions, were investigated.
    The wear loss of ZrO2 balls was attributed to the materials of the tank, such as Al2O3, ZrO2, and urethane. The wear loss of ZrO2 balls using a mill with an Al2O3 lining was larger than that using a mill with ZrO2 or urethane. This result indicated that the wear particles of the Al2O3 lining worn by ZrO2 balls attacked the surface of the ZrO2 balls and promoted the wear of the balls, because Al2O3 particles are harder than ZrO2 balls.
    Also, the wear loss of the ZrO2 balls depended mainly on the grain size, fracture toughness and strength of the balls.
    The SEM of the worn surface showed some defects and pores, and the wear mode was primarily intergranular.
    It was supposed that phase transformation also had an influence on the wear of the balls.
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  • Distribution of Contact Numbers Between Different Particles and the Precision of Estimation
    Hisakazu SHINDO, Ryoji OISHI
    1993 Volume 30 Issue 2 Pages 88-93
    Published: February 10, 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.30.88
    JOURNAL FREE ACCESS
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    A contact number was introduced by Akao in order to evaluate the degree of mixing. The contact number can be defined as the number of particles which are in contact with a particular particle, so-called a “specified particle.” This specification, however, brings a restriction into the sampling. That is, sampling carried out n times cannot always yield n samples.
    A new definition of the contact number is presented, and its distribution is derived from the conventional ones with specified particles. The estimation precision of the new contact number is compared to that of the conventional one. The new contact number is found to be preferable for almost all even concentrations.
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  • Synthesis of Ultrafine Particles by Reactions in Electrical Discharges and its Application
    Shuhei SHIOJI, Hideo YAMAMOTO, Kenjiro TOKAMI, Tsuyoshi NOMURA
    1993 Volume 30 Issue 2 Pages 94-100
    Published: February 10, 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.30.94
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    Corona and silent mode electrical discharges were applied as a means of activation in a CVD reaction. The discharge was formed stably by a high voltage and high frequency a. c. -power supply in an ozonizer-type reactor in an Ar gas atmosphere. Ultrafine SiO2 particles were synthesized by the hydrolysis reaction of silicone tetrachloride in discharges at room temperature and atmospheric pressure. The basic properties of the CVD reaction excited by electrical discharges were experimentally studied.
    The proposed CVD reaction method was applied to ceramic membrane formation and to the hydrolysis reaction of silicon alkoxide. A ceramic membrane which has a fine pore of about 0.5μm and a large porosity was formed by sintering the deposited particle layer. SiO2 particles which have alkoxylated surfaces were synthesized directly from silicon tetraethoxide.
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  • Study on the Deashing of Coal by the Oil Agglomeration Process
    The Effect of the pH of the Disperse Medium on Deashing Efficiency
    Hitoshi TAKASE, Koichi IKEDA, Masunori SUGIMOTO
    1993 Volume 30 Issue 2 Pages 101-107
    Published: February 10, 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.30.101
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    The effect of the pH of the disperse medium on the deashing of coal was investigated in the oil agglomeration process. A coal-water slurry used in the experiment was prepared by suspending ground coal in water as the disperse medium the pH of which was adjusted to 2, 4, 7, 10 and 12. A-class heavy oil was used as the bridging liquid.
    The zeta potential ζ of the coal particle was negative at any pH condition of the disperse medium and |ζ| became the largest value at pH=12. The dispersion of coal particles in the slurry improved with increase in the value of |ζ|. The deashing efficiency of coal by oil agglomeration increased with the dispersibility of coal particles and attained the highest value at pH=12.
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  • Mechanochemistry on Synthesis and Sintering of Ceramic Powder
    Osami ABE
    1993 Volume 30 Issue 2 Pages 108-113
    Published: February 10, 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.30.108
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  • [title in Japanese]
    Tomoaki HINO
    1993 Volume 30 Issue 2 Pages 123-125
    Published: February 10, 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.30.123
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  • [title in Japanese]
    [in Japanese]
    1993 Volume 30 Issue 2 Pages 126-130
    Published: February 10, 1993
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.30.126
    JOURNAL FREE ACCESS
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