Journal of the Ceramic Association, Japan
Online ISSN : 1884-2127
Print ISSN : 0009-0255
ISSN-L : 0009-0255
Volume 59, Issue 656
Displaying 1-11 of 11 articles from this issue
  • [in Japanese]
    1951 Volume 59 Issue 656 Pages 51-55
    Published: February 01, 1951
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    Download PDF (752K)
  • Taro MORIYA, Susumu OKAWARA, Kazunari KITTA
    1951 Volume 59 Issue 656 Pages 56-60
    Published: February 01, 1951
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    The corrosive state and mechanism of agalmatolite crucible attacked by melting glass batch has been investigated microscopically and X-ray photo-graphicaly.
    The batch of Na2O-ZnO-SiO2 glasses were melted in the crucible which composed of 30% clay (Sanage-Kibushi), 40% agalmatolite (Mitsuishi-Roseki) and 30% chamotte.
    After burning the crucible at 900°-1000°C, its mineral compositions were observed by microscope. It has been determined that the composition of the crucible has residual dehydrated pyrophyllite, quartz, tightly coagulated diaspore pseudomorph and isotropic matrix which is the mixture of decomposed substances of clay and pyrophyllite. The texture of the crucible burning at 1400°-1500°C has been seen to be chiefly composed of fine crystal of mullite, cristoballite and Al2O3-rich glassy portion which often contains diaspore pseudomorph and tightly coagulated products of those mixture.
    For melting of Na2O-ZnO-SiO2 glasses in the crucible the corrosion has been done on the inner surface of the crucible and corrosive layer has been observed to reach about 0.5-0.7mm in depth.
    In case of the melting of glass composition containing a small quantity of ZnO-component, the crystal growth of mullite and a crystal of hexagonal form (the nature is still undetermined) have been found in the glass which is in contact with corrosive layer. On the contrally, in case of a large amount of ZnO-component, zinc-spinel has been found in the glass layer; and also the Al2O3-rich portion of corrosive layer has been considerably attacked.
    Indices of the glass layer (2-3mm thickness) in contact wfth the corrosive layer are changed linearly from the layer face.
    Assuming the glass composition in corrosive layer is partly the same with the crucible's, it can be shown that the calculated value of the index of glass in corrosive layer is nearly equal to the observed low limit value of the glass indices which distributed widely in value of index.
    Download PDF (538K)
  • Shoichiro Nagai, Tsunehiko Inoue
    1951 Volume 59 Issue 656 Pages 61-65
    Published: February 01, 1951
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    The sample glass of common soda-lime-silica glass type was prepared from soda ash, calcium carbonate and pure silica, having the main compositions of Na2O 15%, CaO 13% and SiO2 72% (about Na2O. CaO. 5.2SiO2), and five special glass samples containing zirconia were prepared by displacing silica with 2, 4, 6, 8 or 10% of zirconia. These six glass samples were compared the water resisting property by the amount of dissolved alkali in water under the atmospheric pressure or the live steam pressure 8kg/cm2 (about 172°C), 17kg/cm2 (about 205°C), 25kg/cm2 (about 225°C) or 40kg/cm2 (about 251°C). From this alkali solubility test, the glass containing 8 or 10% of zirconia was confirmed to be the most stable form to the high pressure live steam, which will be suitable to the boiler gauge glass.
    Download PDF (704K)
  • T. YOSHII, Y. MURAKAMI
    1951 Volume 59 Issue 656 Pages 66-70
    Published: February 01, 1951
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    The degree of burning of cement clinker is distinguished by its appearance, generally in most cement factories. Litre-weight (g/l) method is popular one to distinguish the degree of burning quantitatively, but it is very difficult, because its measurement differs by degree of charge into a measure for clinker and personal error is quite great, accordingly. Y. Kondo, Professor of Kyôto University, introduced (Proceedings of Japan Cement Engineering Association. III 1949) that E. W. Washburn and E. N. Bunting had measured rapidly the porosity of mortar and concrete by the porosimeter. We got a hint from the report, then measured the porosity of clinker and determined the degree of burning of it by this porosimeter. Besides, some relations between several factors in burning clinker were examined in detail as follows:
    (1) Degree of sintering of clinker can be indicated by the porosity of clinker and the porosity is inversely proportional to the litre-weight.
    (2) Under a certain condition, some corelations between hydraulic modulas, degree of burning, compressive strength of its cement mortar and free lime of which burned from rotary kilns are respectively indicated by some simple formulas and graphs.
    (3) Microscopical investigations show that with increasing “porosity” the Alit increases in amount and size.
    (4) Peculiarities of three kilns and personalities of its respective burners are examined.
    Download PDF (1302K)
  • [in Japanese]
    1951 Volume 59 Issue 656 Pages 71-73
    Published: February 01, 1951
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    Download PDF (519K)
  • [in Japanese]
    1951 Volume 59 Issue 656 Pages 73-75
    Published: February 01, 1951
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    Download PDF (480K)
  • 1951 Volume 59 Issue 656 Pages 75-78
    Published: February 01, 1951
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    Download PDF (607K)
  • [in Japanese]
    1951 Volume 59 Issue 656 Pages 79-82
    Published: February 01, 1951
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    Download PDF (1683K)
  • [in Japanese]
    1951 Volume 59 Issue 656 Pages 83-86
    Published: February 01, 1951
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    Download PDF (690K)
  • 1951 Volume 59 Issue 656 Pages 86
    Published: February 01, 1951
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    Download PDF (188K)
  • 1951 Volume 59 Issue 656 Pages 87-89
    Published: February 01, 1951
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    Download PDF (469K)
feedback
Top