Journal of the Ceramic Association, Japan

Effect of Crucible Supporter on the Growth of Single Crystal by Stockbarger Method Technique

Toru MATSUSHITA, Kunimoto SUZUKI

1964 Volume 72 Issue 821 Pages 105-111
Published: April 01, 1964
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.72.821_105

JOURNAL FREE ACCESS

Show abstractHide abstract

It was made clear through our experiments that in Stockbarger's technique those crucible supporters which prevented the crucible from cooling at its bottom, worked badly on the growth of single crystal. To avoid this inconvenience an experiment was carried out on suspending the crucible above the supporter, and it was found that the single crystal of alkali halides was more easily obtained in this method, even when impurities were highly contained in the sample. The reason was studied by measuring temperature of the crucible bottom and by observing the cooling process. The growth of single crystal may easily occur when there exists a certain distance between the supporter and the bottom. It was explained that when the distance between the supporter and the crucible bottom is too short, the cooling rate is not sufficiently rapid due to the thermal radiation from the supporter.

View full abstract

Download PDF (1664K)
Sintering in the Binary System MoSi₂-WSi₂

Shigetomo MATSUO, Tomitaro KUBO

1964 Volume 72 Issue 821 Pages 111-117
Published: April 01, 1964
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.72.821_111

JOURNAL FREE ACCESS

Show abstractHide abstract

MoSi₂ is electrically conductive and highly stable against oxidation, melts at 2, 030°C and decomposes at 1, 870°C in the presence of carbon. Thus the sintered product has been developed as a heating element which can be used up to 1, 700°C in air. WSi₂ has the similar properties to MoSi₂ but has a higher melting point (2, 150°C) and less oxidizing resistivity. In this report is studied the sintering property in the binary system of MoSi₂-WSi₂ for the purpose of improvement on refractoriness of the MoSi₂ heating element.
Powder mixtures with compositions varied in 6 ways between two ingredients were formed by pressing and sintered in hydrogen atmosphere at temperatures varied in 5 ways from 1, 200°C to 1, 600°C. The sintered product were tested on density, flexural strength, hardness, electrical resistivity, oxidizing resistivity and thermal shock resistance. Since there is a limit in the mutual solubility of MoSi₂ and WSi₂ at low temperatures two phases exist in the product sintered below 1, 500°C, but they fuse into one at 1, 600°C. The most suitable product for heating element was found to be the composed of 90% MoSi₂ 10% WSi₂ and sintered at 1, 600°C.

View full abstract

Download PDF (2106K)
Casting Properties of Pottery Body due to Specific Base-Exchange Cations

Studies on Slip Casting (VIII)

Yoichi SHIRAKI

1964 Volume 72 Issue 821 Pages 117-122
Published: April 01, 1964
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.72.821_117

JOURNAL FREE ACCESS

Show abstractHide abstract

By determining the effect of specific base-exchange cations on casting behaviors, H⁺-, Na⁺-, K⁺-, NH₄⁺-, Ca⁺⁺-, and Mg⁺⁺- bodies were prepared using a typical japanese pottery body. The calculated mineralogical composition was 45.7% quartz, 11.0% beldspar, 27.0% kaolinite, 11.0% sericite, 2.8% pyrophyllite, and 2.5% dolomite; and exchangeable capacity was 3.2 m.e./100g. Sodium silicate was used as an electrolyte and the water content in body slip was adjusted to indicate Newtonian flow (60% solid). The following properties were carried on these casting slips; consistency, specific gravity, rate-on-cast and retained water, and on cast bodies; drying shrinkage, modulus of rupture, bulk and apparent density, porosity and water absorption.
There is a marked relations between casting properties and exchangeable cation, and the most satisfactory cation is Mg⁺⁺.
It is concluded that the determination of exchangeable base should be of considerable aid in the control of casting slips.

View full abstract

Download PDF (1517K)
[title in Japanese]

1964 Volume 72 Issue 821 Pages A21-A26
Published: April 01, 1964
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.72.821_A21

JOURNAL FREE ACCESS

Download PDF (1944K)
[title in Japanese]

John P. Hotl, [in Japanese], [in Japanese]

1964 Volume 72 Issue 821 Pages C363-C366
Published: April 01, 1964
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.72.821_C363

JOURNAL FREE ACCESS

Download PDF (1518K)
[title in Japanese]

[in Japanese]

1964 Volume 72 Issue 821 Pages C367-C370
Published: April 01, 1964
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.72.821_C367

JOURNAL FREE ACCESS

Download PDF (1950K)
[title in Japanese]

[in Japanese]

1964 Volume 72 Issue 821 Pages C371-C374
Published: April 01, 1964
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.72.821_C371

JOURNAL FREE ACCESS

Download PDF (1631K)
[title in Japanese]

[in Japanese]

1964 Volume 72 Issue 821 Pages C375-C380
Published: April 01, 1964
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.72.821_C375

JOURNAL FREE ACCESS

Download PDF (2015K)
[title in Japanese]

[in Japanese]

1964 Volume 72 Issue 821 Pages C381-C386
Published: April 01, 1964
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.72.821_C381

JOURNAL FREE ACCESS

Download PDF (1339K)
[title in Japanese]

1964 Volume 72 Issue 821 Pages C387-C399
Published: April 01, 1964
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.72.821_C387

JOURNAL FREE ACCESS

Download PDF (3954K)
[title in Japanese]

1964 Volume 72 Issue 821 Pages C411-C414
Published: April 01, 1964
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.72.821_C411

JOURNAL FREE ACCESS

Download PDF (1254K)

Register with J-STAGE for free!