Journal of the Ceramic Association, Japan
Online ISSN : 1884-2127
Print ISSN : 0009-0255
ISSN-L : 0009-0255
Volume 68, Issue 769
Displaying 1-11 of 11 articles from this issue
  • Fumio IMOTO, Kazushige HIRAO
    1960 Volume 68 Issue 769 Pages 83-88
    Published: January 01, 1960
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    The “optimum firing temperature” (θf) of enamel frit is defined as the temperature at which the viscosity of the molten glass becomes 4000 poises. θfs of multi-component glasses were interpolated, measuring their viscosities by means of the counterbalance method. An orthogonal array of 3n-type was applied as the substituting means of the components among others, and the effects of each component substituting silica was calculated. Moreover, this effect can be used as the additive constant for θf, which also gives a base to derivate the “refractory index”. The new indices proved themselves more reasonable than those of R. R. Danielson's. The analysing method of the results of the acidresistance tests was also discussed, and the scale of the “rationality” of the acidresisting-enamel composition was given by means of the proper classification.
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  • Studies on the Refractories used in an Open-Hearth Furnace (VIII)
    Takeji OYAMA
    1960 Volume 68 Issue 769 Pages 88-93
    Published: January 01, 1960
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    Microscopical and chemical studies on the mechanism of corrosion of chrome-magnesia refractories used in an open-hearth furnace were reported in previous papers, and the present one contains the results of X-ray studies on the constitutional minerals (spinel periclase and matrix minerals) in every zones of the burned chrome-magnesia brick from the front wall and the unburned brick from the zebra roof of basic open-hearth furnace.
    The lattice constants of original chromite spinel separated from the lowest temperature (unaltered) zone, magnetite spinel in the working face of the burned brick and that embeded in a silicious glass matrix in the unburned brick from zebra roof were 8.21, 8.35 and 8.40 Å respectively. This expansion of the spinel due to the variation of its chemical composition is connected with the bursting phenomenon of the brick.
    Augite is a predominant constitutional mineral of matrix in the hottest face, and forsterite and monticellite are principal matrix minerals in the middle zone of the brick.
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  • Studies on the Injection Molding of Ceramics, II
    Asao MOTEKI
    1960 Volume 68 Issue 769 Pages 93-103
    Published: January 01, 1960
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    The effects of several additions and heating velocities on the firing characteristics of the injection molding of ceramics were studied.
    Stearic acid and D. E. P. added to polystyrene as the lubricant or the plastitizer gave favorable results for improving the plasticity of the mix. Particularly, D. E. P. showed the best heating properties which mainly come from its low volatilization temperature.
    Taking into consideration the effect of stearic acid on the heating properties of molded ceramics it was confirmed that the amount should be kept less than 4%.
    As the heating velocity has remarkable influence on the heating properties the heating schedule should be determined by taking into concideration of the kind of agents, and the thickness of the article.
    The molded articles of 6mm thick (Al2O3-styrene-stearic acid-D. E. P. system) must be heated with the velocities less than about 7°C per hour.
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  • [in Japanese]
    1960 Volume 68 Issue 769 Pages 103-104
    Published: January 01, 1960
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
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  • 1960 Volume 68 Issue 769 Pages A1-A8
    Published: January 01, 1960
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1960 Volume 68 Issue 769 Pages C2-C9
    Published: January 01, 1960
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1960 Volume 68 Issue 769 Pages C10-C16
    Published: January 01, 1960
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1960 Volume 68 Issue 769 Pages C17-C21
    Published: January 01, 1960
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1960 Volume 68 Issue 769 Pages C22-C26
    Published: January 01, 1960
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1960 Volume 68 Issue 769 Pages C27-C29
    Published: January 01, 1960
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1960 Volume 68 Issue 769 Pages C30-C36
    Published: January 01, 1960
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
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