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Volume 44, Issue 527
Displaying 1-11 of 11 articles from this issue
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Junichi Isobe, Takashi Fukagawa, Seiji Kondo1936 Volume 44 Issue 527 Pages 785-788
Published: 1936
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn this second article of the series, significance of wet processes of proportioning ceramic raw materials are explained and errors which may occur in the processes are discussed.
Required weight of raw material, G, can be obtained by measuring sp. gr. of slip, S, and its volume V as the following formula shows:
G=(S-b)/(a-b)⋅aV
Where a and b are sp. gr. of raw material and water respectively.
The ratio of the maximum probable error in the required weight of raw material, dG, to the weight G can be expressed as follows:
dG/G=dV/V+|-bda/(a-b)a|+|-(a-S)db/(a-b)(S-b)|+dS/S-b
In the equation, errors in the measurement of volume V and sp. gr. of water b are almost negligible; effect of error in the measurement of sp. gr. of raw material, a, may be large provided that the value of a is compartively small; effect of error in the measurement of sp. gr. of slip is most fearful especially when its value is small.View full abstractDownload PDF (545K) -
MODULUS OF ELASTICITY AT ROOM TEMPERATURESSeiji Kondo, Hiroshi Yoshida1936 Volume 44 Issue 527 Pages 789-796
Published: 1936
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSRectangular test pieces, about 1.5cm thick, 2cm. wide, and 12cm. long, were cut from 3 brands of Japanese magnesite brick, that made in Veitzsch, and Radex brick. They were placed on 2 knife edges with about 10cm. span in the authors' apparatus described in the first article on this subject to find out the relation between the central load and deflection at room temperatures by varying the load from 1 to 13kg. Then the mean deflection per kg, increase of the load was determined for each test piece and the modules was calculated therefrom. Experiments were also made on the relation between the modules and porosity as well as that between the modules and microstructure. The results seem to justify the following conclusions:
(1) In sagger clays modulus of elasticity and porosity are said to be inversely proportional. This is not always true in magnesite refractories.
(2) Tendencies are that cleavages of periclase crystals in the refractories are almost none in those portions rich in forsterite, are fine and numerous in those portions poor in forsterite, and are big and few where forsterite is almost lacking.
(3) The refractories in which periclase crystals are well developed in large and polygonal shapes are not necessarily elastic.
(4) The refractories rich in the cleavages have low modulus of elasticity. However, this can not explain whole of the phenomenon.
(5) Size of grain agrees best with the elasticity of the refractories.
(6) Roundness of the grain seems to increase the elasticity.View full abstractDownload PDF (2860K) -
K. Fuwa1936 Volume 44 Issue 527 Pages 796-799
Published: 1936
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe present paper deals with the study of the glasses prepared from the batch mixtures containing the ferrous-oxalate instead of the ferric oxide in the IV th report of the “Glasses Containing Iron Oxide.”
A) The Determination of FeO present, Total Iron Oxide as Fe2O3, and the Ratio FeO/FeO+Fe2O3.
B) The Transmission Curve and the Colour of the Glass.
Comparing the transmission curves of this series of glasses with those of the corresponding soda-lime-silica glasses in the previous report of the “Glasses Containing Iron Oxide III, ” there was little distinction between the wave length of maximum transmission at the range of less than two per cent of total ironoxide and no appreciable distinction at the range of more than this content.
When the total ironoxide content was small, the color in this series of glasses was bluish and with higher total ironoxide content the color ranging from greenish to dark green was observed.View full abstractDownload PDF (546K) -
T. Yoshii1936 Volume 44 Issue 527 Pages 800-802
Published: 1936
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESS1. The gas quantity and its temperatures in a rotary kiln were measured by author, then its gas volume passing through the respective parts in the kiln were calculated.
2. The diameter of the gas column, thus calculated, is the greatest at the middle of the sintering zone and smaller at both ends of the kiln. Therefore the shape of the rotary kiln is to be proportionally designed to its gas column.View full abstractDownload PDF (394K) -
1936 Volume 44 Issue 527 Pages 803
Published: 1936
Released on J-STAGE: April 30, 2010
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[in Japanese]1936 Volume 44 Issue 527 Pages 804-812
Published: 1936
Released on J-STAGE: April 30, 2010
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[in Japanese]1936 Volume 44 Issue 527 Pages 813-821
Published: 1936
Released on J-STAGE: April 30, 2010
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[in Japanese]1936 Volume 44 Issue 527 Pages 822-825
Published: 1936
Released on J-STAGE: April 30, 2010
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[in Japanese]1936 Volume 44 Issue 527 Pages 825-828
Published: 1936
Released on J-STAGE: April 30, 2010
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1936 Volume 44 Issue 527 Pages 829-840
Published: 1936
Released on J-STAGE: April 30, 2010
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1936 Volume 44 Issue 527 Pages 844-848
Published: 1936
Released on J-STAGE: April 30, 2010
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