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 4, Issue 4
Displaying 1-6 of 6 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1958 Volume 4 Issue 4 Pages 120-138
    Published: April 05, 1958
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.4.120
    JOURNAL FREE ACCESS
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  • On the Effects of Calcining Conditions of Iron and Chromium Salts on the Size of Particles of their Products
    Toshio Takada
    1958 Volume 4 Issue 4 Pages 139-148
    Published: April 05, 1958
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.4.139
    JOURNAL FREE ACCESS
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    Fe2O3 and Cr2O3 were prepared by calcining iron and chromium salts respectively, and the calcining conditions such as temperature, time, and heating velocity on the size of particles of the products were investigated.
    The results indicated that: (1) In gereral, the size of unit particles of the products increases as the temperature and time of calcination are increased. (2) Much larger particles of oxides may be obtained if the salts are decomposed very slowly and kept at fairly low temperature for a long time than decomposed rapidly and heated at high temperatures. (3) Minute particles may be obtained if the time of calcination is reduced to a few seconds even when the temperature of calcination is very high.
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  • On the Rate of Growth of Ferric Oxide Particles at High Temperatures as Related to Their Initial Size
    Toshio Takada
    1958 Volume 4 Issue 4 Pages 149-159
    Published: April 05, 1958
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.4.149
    JOURNAL FREE ACCESS
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    Optical and electron microscope investigations showd d that the growth rate of unit particles of ferric oxide at high temperatures is of dependence upon their initial size of the unit particles and their aggregates before heating. In detail : (1) The unit particles with smaller initial size show higher rates of growth at higher temperatures. (2) The size of unit particles heated at constant temperatures is affected by the initial size of their aggregates. The growth of unit particles caused by the material transport between their aggregates is acceralated by heating at higher temperatures. (3) The growth rate of unit particles at higher temperatures is greater for the sample compacted than for the loose sample.
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  • On the Effects of Particle Size and Shape on the Colour of Ferric Oxide powders
    Toshio Takada
    1958 Volume 4 Issue 4 Pages 160-168
    Published: April 05, 1958
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.4.160
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    Ferric oxide powders prepared by calcining iron salts exhibit a variety of colours, i. e. pure red, yellowish red, dark red, and black, according to the condition of calcination. Morphological studies revealed that the colour of powders is dependent upon the size and shape of the unit particles and their aggregates. The powders change in colour from yellowish red or dark red to black as the size of unit particles or of their aggregates increases. On the basis of this result explanations were given to the nature of colour of glaze containing iron red and, also, of water containing Fe2O3 in colloidal subdivision.
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  • Studies on Iron Red Glazes
    Toshio Takada
    1958 Volume 4 Issue 4 Pages 169-186
    Published: April 05, 1958
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.4.169
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    Spectrophotometer, electron microscope, and X-ray studies have revealed chat the red colour of iron glazes is caused by ferric iron oxide in colloidal subdivision in the glass phase. The shade of the red colour is dependent of the size and shape of the Fe2O3 particles. Properties of the iron oxide used as the raw material, and their treatment such as milling and firing, as well as the thickness of glaze layer were also found to be of decisive influence on the colour of glaze.
    During the firing of iron glaze, the Fe2O3 particle in the molten glass phase was found to grow in size, resulting the change of colour of the glaze. The rate of growth of the Fe2O3 particles increased with the increasing solubility of Fe2O3 in the glass melt. On the basis of this result, an iron glaze having excellent constancy of the colour during firing was developed.
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  • Considerations on the Effects of their Particle Size and Shape on the Colour of Ferric Oxide Powders
    Toshio Tahada, Masao Kiyama
    1958 Volume 4 Issue 4 Pages 187-192
    Published: April 05, 1958
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.4.187
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    In the previous paper of the author, the effects of particle size and shape on the colour of Fe2O3 powders were studied experimentally. In the present work, a theoretical explanation was given to the experimental results.
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