Journal of the Ceramic Association, Japan
Online ISSN : 1884-2127
Print ISSN : 0009-0255
ISSN-L : 0009-0255
Volume 63, Issue 717
Displaying 1-10 of 10 articles from this issue
  • Yuichi SUZUKAWA
    1955 Volume 63 Issue 717 Pages 705-712
    Published: December 01, 1955
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    In the previous paper concerning with Na2O-containing phase in portland cement clinker, it was indicated that the X-ray diffraction pattern of the ternary compound of Brounmiller and Bogue to which the composition NC8A3 is assigned, is not correct, and the prismatic dark phase in clinker of the systems C-A-F-S-M-N-(SO3) is the metastable phase of NC8A3, containing small amount of SiO2.
    Successively, some studies of K2O-containing phase in portland cement clinker have been made. From the microscopic observation and powder X-ray diffraction, the following results have been obtained.
    a. KC23S12 is not a ternary compound, but a stabilized α′-C2S by the formation of substitutional solid solution of K2O in C2S.
    b. The prismatic dark phase in preparation of the systems C-A-(F)-S-K is the metastable phase of KC8A3, containing small amount of SiO2 as solid solution or an integral part of the unit cell structure.
    Accordingly, the fact that the addition of increasing amounts of K2O to a raw mixture results in progressively increased amounts of free CaO in clinker is not only due to the formation of substitutional solid solution of K2O in C2S, but also the following reaction:
    3C3A+K2O=KC8A3+CaO
    Furthermore, the manner in which K2O is combined in portland cement clinker has been discussed.
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  • Saburo KIKUCHI, Kinji SHIMADA, Takashi KOMAKI
    1955 Volume 63 Issue 717 Pages 713-717
    Published: December 01, 1955
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    White clay resources are very abundant in South Kyushu, though very little have ever been reported on them except the well-known “Ibusuki clay”. The object of this paper is to describe the results of the writers works on the fundamental properties of four kinds of the white clays, namely those produced in Kirishima, Iriki, Okuchi, and Masaki.
    The clays here selected are all of vast resources and exceptionally poor in iron.
    Grading analysis, chemical analysis, various thermal tests, X-ray analysis, electron-microscopic survey etc. were conducted on these clays, with the results as follow:
    (1) It is very likely that the main component mineral of these clays is hydrohalloysite. The mineral composing Masaki, Iriki, and Kirishima clays, all of which are presumed to be of hydrothermal origin, shows a tubular shape under the electron-microscope. On the other hand, the one contained in Okuchi clay, which was derived from tuff through superficical weathering, appers as a rounded granule without any linear outline.
    (2) Iriki clay is comparatively coarse-grained, while Kirishima and Masaki clays are rather fine-grained. Okuchi clay is so fine-grained that 75% of the component minerals are less than 2μ in diameter.
    (3) All of the four clays are very high in refractoriness, while the burning colours of Masaki and Iriki clays are snowy white. Thus the two clays are considered to be very suitable for the raw materials of ceramic wares.
    (4) When burnt up to 1000°C, the coefficients of contractions of Iriki, Okuchi, and Masaki clays were almost similar, about 7.0%, while that of Kirishima clay showed a lower value, 5.6%.
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  • Especially on its Mineral Composition and the Applicability for Ceramic Raw Material
    Kozo SUGIURA, Yasushiro KURODA
    1955 Volume 63 Issue 717 Pages 717-722
    Published: December 01, 1955
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    In the present paper, the results of petrographical and mineralogical observations on Roseki from Ugu mine, Nago-machi, Yamaguchi-prefecture, are described, together with some considerations on its applicability for refractory materials. The characteristic features of this mine may be summed up as follows:
    1) Main clay mineral composing the Roseki is sericite, but not pyrophyllite. This fact seems to be responsible for its higher sintering power than that of normal pyrophyllitic Roseki.
    2) Andalusite is so widely distributed throughout this mine that the existence was confirmed in more than half of the collected specimens. In some case, it occupies as much as 40% of the bulk. This causes its high refractoriness, in spite of its containing a considerable amount of sericite.
    3) The specimens are fairly rich in non-hydrous minerals, such as andalusite, corundum, quartz, etc.. This suggests that the formation of the mine was taken place under a comparatively dry condition or at the comparatively high temperature.
    4) The granularity of the sepcimens of this Roseki is, in many cases, markedly higher than those of the normal Rosekis in other districts. Especially, the diameter of the clay minerals sometimes attain up to 5mm or more.
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  • Masamitsu YANAGI, Syoitiro KAWAKUBO
    1955 Volume 63 Issue 717 Pages 722-727
    Published: December 01, 1955
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    In succession to our previous report [this Journal; 63 [704] 6 (1955)], amounts of alkaline metal ions and alkaline earth metal ions leached out of the glass by boiling water are determined separately by means of a flame photometer and their total is compared with values obtained by acid titration. All glass samples are of the ordinary soda-lime-silica glass type. Comparison of the values obtained by these two methods are in good agreement in this experiment with glass samples containing only silica as acidic component.
    Alkaline earth metal ions are leached out in fairly noticeable amount by glasses of three components type, but the introduction of alumina as the fourth component suppresses markedly the migration of alkaline earth metal ions into water, while this suppressing effect on the alkaline metal ions is less remarkable.
    With the flame photometer of our laboratory, the mutual interference of ions of the alkaline metals and alkaline earth metals are studied with the result that in the concentration range usually met in these durability experiments and quantitative analysis of glass the interference can be neglected.
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  • VII Slip-casting of Grog Body
    Yoichi SHIRAKI, Denji KATASE
    1955 Volume 63 Issue 717 Pages 728-737
    Published: December 01, 1955
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    One hundred and ninety two thixotropic casting slips were prepared, using bodies of the mixture of grog and kaolinite. The electrolyte was NaOH only or a combination of NaOH and HCl. Combinations of the selected grog mixtures 70% and kaolinite 30% were prepared and the viscosity of slips was determined as well as the casting rate, shrinkage, strength, and pH when the casting slips were first prepared and again after 48-, and 168-hours aging periods.
    There are no evident relations between pH and viscosity, time of release from mould and viscosity of casting slips, but is a close relation between castability and coefficient of thixotropy.
    The fired cast bodies from casting slip of low viscosity and high thixotropy which are close packing mixtures of grog and kaolinite, have very high strength, low permeability and porosity.
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  • No. 103 Committee
    1955 Volume 63 Issue 717 Pages 738-758
    Published: December 01, 1955
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1955 Volume 63 Issue 717 Pages 763-767
    Published: December 01, 1955
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
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  • 1955 Volume 63 Issue 717 Pages 769-776
    Published: December 01, 1955
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
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  • 1955 Volume 63 Issue 717 Pages 776-780
    Published: December 01, 1955
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
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  • 1955 Volume 63 Issue 717 Pages 787-790
    Published: December 01, 1955
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
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