Journal of the Japan Society of Powder and Powder Metallurgy
Online ISSN : 1880-9014
Print ISSN : 0532-8799
ISSN-L : 0532-8799
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Volume 15, Issue 8
Displaying 1-12 of 12 articles from this issue
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  • The Effect of Particle Diameter Ratio on the Friction and Cohesion of Powder Mixture
    Mamoru Senna, Hiroshi Kuno
    1969 Volume 15 Issue 8 Pages 381-386
    Published: January 25, 1969
    Released on J-STAGE: December 04, 2009
    DOIhttps://doi.org/10.2497/jjspm.15.381
    JOURNAL FREE ACCESS
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    The parameter c, reflecting the frictional and cohesive properties of binary powder mixture was obtained from the bottom pressure measurements. The effects of the particle diameter. ratio and the way of external pressure application upon c were studied.
    In. all cases, c of the mixture deviates from the linear. line connecting the value of each component, although the parameter c approached to the linear line for the small diameter ratios. At low external pressure experiments, the deviation was positive. This deviation was, however, reversed when relatively high pressure was applied with preconsolidation.
    These findings indicate that the interaction between fine and coarse particles, accordingly the state of aggregates is quite different depending on the applied external pressure. A part of these interactions was considered as due to the coarse-fine aggregates, which was confirmed by the relation of c to the loosely packed density.
    Therefore, a care must be always taken in evaluating the flow or compressional properties, i.e., in measuring the frictional or cohesive properties of mixed powders and its effects on the state of aggregates, particularly in regard to the range of applied force.
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  • [title in Japanese]
    [in Japanese]
    1969 Volume 15 Issue 8 Pages 387-391
    Published: January 25, 1969
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.15.387
    JOURNAL FREE ACCESS
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  • ERRATUM
    1969 Volume 15 Issue 8 Pages 391
    Published: 1969
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.15.391
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1969 Volume 15 Issue 8 Pages 392-399
    Published: January 25, 1969
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.15.392
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1969 Volume 15 Issue 8 Pages 400-408
    Published: January 25, 1969
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.15.400
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  • [title in Japanese]
    [in Japanese]
    1969 Volume 15 Issue 8 Pages 409-413
    Published: January 25, 1969
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.15.409
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  • [title in Japanese]
    [in Japanese]
    1969 Volume 15 Issue 8 Pages 414-419
    Published: January 25, 1969
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.15.414
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  • Study on Pressure Sintering Mechanism with Low Melting-point Compound
    Pressure Sintering of Benzoic Acid Crystal Powder
    Takamasa Yashiro, Hiroshi Kuno
    1969 Volume 15 Issue 8 Pages 420-426
    Published: January 25, 1969
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.15.420
    JOURNAL FREE ACCESS
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    In order to simplify experimental procedures a model study with a low melting-point material (benzoic acid) has been performed to study the mechanism of pressure sintering.
    Theoretical equations for the pressure sintering were derived assuming the viscous flow mechanism with the applied pressure as the only driving force for the densification. This viscous flow mechanism was found to be applicable to the pressure sintering of benzoic acid crystal powder assuming Newtonian solid for the high temperature range and Bingham solid for the low temperature range.
    The boundary temperature of these two temperature ranges falls with.the increase of the applied pressure and was found to coincide with the melting-point when the applied pressure becomes zero.
    Activation energy of the flow in Newtonian range and the final attainable porosity in Bingham range were calculated.
    It was found that this kind of model experiniefit is quite effective in the research of pressure sintering mechanism.
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  • [title in Japanese]
    [in Japanese]
    1969 Volume 15 Issue 8 Pages 427-431
    Published: January 25, 1969
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.15.427
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  • [title in Japanese]
    [in Japanese]
    1969 Volume 15 Issue 8 Pages 432-439
    Published: January 25, 1969
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.15.432
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  • [title in Japanese]
    [in Japanese]
    1969 Volume 15 Issue 8 Pages 440-444
    Published: January 25, 1969
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.15.440
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  • Dissociation and Crystal Distortion of Copper Ferrite
    Seishiro Sahara, Takashi Yamaguchi
    1969 Volume 15 Issue 8 Pages 445-448
    Published: January 25, 1969
    Released on J-STAGE: December 04, 2009
    DOIhttps://doi.org/10.2497/jjspm.15.445
    JOURNAL FREE ACCESS
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    Based on the dissociation characteristics determined volumetrically, copper ferrite powder samples having various oxygen deficiencies were subjected to different heat-treatments under the non-oxidizing condition. It is shown that in addition to the heat-treatment, oxygen deficiency must be taken into consideration for understanding the crystal distortion in copper ferrite. Dependence of crystal distortion on the oxygen deficiency could be interpreted as due to the reduced population of Cu++ in the octahedral site in spinel lattice, caused by the separation of CuO from the host phase and by the formation of Cu+.
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