Journal of the Ceramic Association, Japan

Studies on the Factors Affecting the Workability (Fluidity) of Resins Used for the Injection Molding of Ceramics

Studies on the Injection Molding of Ceramics, I

Asao MOTEKI

1959 Volume 67 Issue 768 Pages 387-399
Published: December 01, 1959
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.67.768_387

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For the injection molding of ceramic materials with the addition of thermoplastic resins the latter should have, besides the proper thermoplasticity, the volatility which gurantees the complete disappearance of the organic materials during the firing process without leaving any effect such as blister, deformation and crack.
As the basic experiments such properties as (1) volatility and (2) the influence of the various lubricants and plasticizers were studied with the following results:
The molding property in the injection is closely related with the density of the ceramic materials; in general, the higher the density the better will be the results. The materials having low density are rather difficults to form by injection molding.
It was confirmed that the non plastic ceramic materials gave better fluidity than ordinary plastics at low temperatures, and that the addition of D. E. P. lowered remarkably the fluid-temperature.
For the injection molding of Al₂O₃ powder the addition of 14-16% polystyrene, 2-4% stearic acid and 0-2% D. E. P. showed good moldability and could be molded comparatively easily.

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On the Conditions of Anodic Oxidation of Aluminium Plates for the Pretreatment of Applying Lead, Bososilicate and Phosphate Enamels

Studies on Aluminium Enamelling, II

Toshio YAMADA

1959 Volume 67 Issue 768 Pages 399-403
Published: December 01, 1959
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.67.768_399

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In the previous paper (J. Ceram. Assoc. Japan, 67 [1] 126-20 (1959)) it was pointed out that the anodic oxidation of aluminium plate with lithium-perborate and the mixture gave the good results for the coatings of the systems, borosilicates, lead, and phosphate.
This report contains the results of the investigations carried on for finding out the optimum concentration and the temperature of the perborate bath as well as the voltage and the time of the treatment which guarantee the good adherence.
In the bending test the conditions, ;
Bath concentration 2-3%
Bath temperature 30-50°C
Voltage 40-50 Volt
Current density 0.5-1 A/dm²
Time of treatment 5-10 min.
gave the good results which proves the strong adherence of the coatings.

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Equilibrium Diagram of the Area Sanbornite-Forsterite-Silica in the Ternary System of MgO-BaO-SiO₂

Studies on the Deterioration Phenomenon of Steatite Bodies, III

Fukutaro YASUNO

1959 Volume 67 Issue 768 Pages 403-420
Published: December 01, 1959
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.67.768_403

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In the second report (J. Ceram. Assoc. Japan, 67 [7] 227 (1959)) the author has stated that the primary cause of the deterioration phenomenon of steatite bodies is the devitrification in the glass phase due to the transition during the cooling period of the phase equilibrium between the proto-enstatite and the melt established in the maturing period.
The composition of the liquid or the glass phase is determined by the chemical composition of the body as well as the firing temperature. It may, therefore, be possible to indicate clearly the mechanism of deterioration if we know exactly the transition of phases occuring in the bodies of different composition.
Investigations have been carried out to draw the equilibrium diagram of the system sanbornite-forsterite-silica which enables us to know precisely the process of the devitrification. It was confirmed that the major crystalline product of separation form glassphase is proto-enstatite which has the characteristic property of trans-forming easily even in the presence of glass-phase.
It was thus established that the deterioration of steatite orginates mainly from the devitrification phenomenon.

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The Cation Fixation in Kaolinitic Clay Minerals Studies on the Fixation Phenomenon of the Cations Adsorbed

on Clay Minerals Caused by Drying, IV

Susumu OKUDA, Keikichi INOUE, Isao UEI

1959 Volume 67 Issue 768 Pages 421-425
Published: December 01, 1959
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.67.768_421

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A study on the fixation character of various cations adsorbed on kaolin minerals due to drying have been carried out. Kibushi clay, Gaerome clay, both are widely used in ceramic industry in Japan, and Zettlitz kaolin were selected as samples.
The obtained results are summerized as follows:
(1) The fresh raw undried Kibushi and Gaerome clays, fixed the exchangeable cations (Na⁺, K⁺, Ca⁺⁺, Mg⁺⁺) increasingly with drying temperature up to 50-500°C.
(2) Various monoionic clays prepared by leaching with chloride solutions fixed the cations increasingly with drying temperature up to 200-300°C. The order of the fixation tendency was Li⁺>Na⁺>K⁺.
(3) Polyvalent cations (Th⁺⁺⁺⁺, Ca⁺⁺) adsorbed on Zettlitz kaolin were found to be fixed intensively on drying at the temperature up to 300-500°C.

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[title in Japanese]

1959 Volume 67 Issue 768 Pages 426
Published: December 01, 1959
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.67.768_426

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[title in Japanese]

[in Japanese]

1959 Volume 67 Issue 768 Pages C415-C424,C436
Published: December 01, 1959
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.67.768_C415

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[title in Japanese]

[in Japanese]

1959 Volume 67 Issue 768 Pages C425-C430
Published: December 01, 1959
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.67.768_C425

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[title in Japanese]

R. N

1959 Volume 67 Issue 768 Pages C430
Published: December 01, 1959
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.67.768_C430

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[title in Japanese]

[in Japanese]

1959 Volume 67 Issue 768 Pages C431-C436
Published: December 01, 1959
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.67.768_C431

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[title in Japanese]

[in Japanese]

1959 Volume 67 Issue 768 Pages C437-C444
Published: December 01, 1959
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.67.768_C437

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