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Volume 48, Issue 576
Displaying 1-13 of 13 articles from this issue
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[in Japanese]1940 Volume 48 Issue 576 Pages 553-555
Published: December 01, 1940
Released on J-STAGE: April 30, 2010
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Comparison and consideration of test methodsNagaeda Syunpei1940 Volume 48 Issue 576 Pages 556-559
Published: December 01, 1940
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSActions of boiling water (80°C, 100°C) and super-heated vapor (-250°C) on two borosilicate glasses A and B were studied by comparing the results on three sets of test, a autoelave test and other two. Compositions of glases A and B are shown as follows,
(weight %) A; SiO2 68% B2O3 11% Na2O +K2O 19% BaO 2%
B; SiO2 50% B2O3 20% Na2O 30%
Data of the three methods were obtained by measuring the weight, decrease % and extracted alkali c.cm. by titration for powdered samples, Taylor sieves No. 20-30 or 30-40.
The results of experiments are summarized as follows;
(1) In the autoclave tests, glass A is decomposed abruptly over 210°C (ca. 20 atm. vapor), having kept the slight decreasing tendency until that temperature has reached. On B glass exceeding change took place at 110°C early and at 170°C the weight decrease shows 70%, having perfect decomposition over this temperature.
(2) By heated water the glasses A and B are attacked no more rapidly than did on autoclave test, namely in the case of glass A the action at 80°C 10hrs. was equal to one-third of at 130°C 2 hrs. and on B glass 100°C 23hrs. equal to 130°C 2 hrs test in weight decrease %.
(3) Relation between extracted alkali c.cm. or weight decrease % and boiling time at 80°C on A glass, 100°C on B glass are expressed in following parabolic formula, which had been recognized to apply on CaO-Na2O-SiO2 glasses in powder method by G. Keppeler.
X2=c.t
X; Weight decrease % or extracted alkali c.cm. t; time c; constant. On every test the weight decrease % paralleled the extracted alkali c.cm. values nearly.
Thanks to Prof. Dr. Nagai-S. and Director Mr. Nagaoka-M.View full abstractDownload PDF (1495K) -
Takeo Ao, Hiroshi Okabe1940 Volume 48 Issue 576 Pages 560-562
Published: December 01, 1940
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe author has tried to determine the composition, thermal change, specific gravity of the roseki clay produced from roseki ore (aggregation of pyrophyllite, kaolinite and diaspore) and the diameter of its grain.
As the results of this experiment it becomes clear that the roseki clay can substitute the titanium oxide used as forsted agent of artificial silk.View full abstractDownload PDF (1388K) -
[in Japanese]1940 Volume 48 Issue 576 Pages 563-565
Published: December 01, 1940
Released on J-STAGE: April 30, 2010
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[in Japanese]1940 Volume 48 Issue 576 Pages 566-571
Published: December 01, 1940
Released on J-STAGE: April 30, 2010
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[in Japanese]1940 Volume 48 Issue 576 Pages 571
Published: December 01, 1940
Released on J-STAGE: April 30, 2010
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[in Japanese]1940 Volume 48 Issue 576 Pages 572-575
Published: December 01, 1940
Released on J-STAGE: April 30, 2010
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1940 Volume 48 Issue 576 Pages 576-588
Published: December 01, 1940
Released on J-STAGE: April 30, 2010
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1940 Volume 48 Issue 576 Pages 588
Published: 1940
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1940 Volume 48 Issue 576 Pages 589-598
Published: December 01, 1940
Released on J-STAGE: April 30, 2010
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1940 Volume 48 Issue 576 Pages 606-607
Published: December 01, 1940
Released on J-STAGE: April 30, 2010
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[in Japanese]1940 Volume 48 Issue 576 Pages ap261-ap263
Published: December 01, 1940
Released on J-STAGE: April 30, 2010
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1940 Volume 48 Issue 576 Pages ap264-ap278
Published: December 01, 1940
Released on J-STAGE: April 30, 2010
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