Journal of the Ceramic Association, Japan

[title in Japanese]

[in Japanese]

1955 Volume 63 Issue 706 Pages 85-87
Published: March 01, 1955
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.63.706_85

JOURNAL FREE ACCESS

Download PDF (1152K)
Fundamental Studies on the Spray Drying and Semi-dry Press of Ceramics, (IV)

On the Flow Velocity of Spherical Fine Particles from Ceramic clay slip

Chihiro KAWASHIMA, Yorihiro MURATA

1955 Volume 63 Issue 706 Pages 88-91
Published: March 01, 1955
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.63.706_88

JOURNAL FREE ACCESS

Show abstractHide abstract

The free-flowing phenomenon of spherical fine particles (48-88μ) obtained by spray drying of ceramic clay slips was studied. As a result, we concluded that the following expression is established between particle size d_p, nozzle diameter d⁰ and equilibrium flow velocity Ve.
Ve=Kd²(d_p-d₀)
where, K is a constant defined only by the physical properties of particles and is so-called the coefficient of free flowing of spherical fine particle, and d₀ is a diameter of the smallest particle that is necessary to do free flowing.
In the case of irregular particles and mixing powders, the above relationship is approximately satisfied. However, according to the nozzle diameter becoming larger, the equilibrium velocity has a tendency to become unstable.
7 Figs, 6 References.

View full abstract

Download PDF (1075K)
Fundamental Studies on the Spray Drying and Semi-dry press of Ceramics, (V)

On the Compacting Process of Ceramic Powder and Chemicophysical Properties of Green Body

Chihiro KAWASHIMA, Yorihiro MURATA

1955 Volume 63 Issue 706 Pages 91-96
Published: March 01, 1955
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.63.706_91

JOURNAL FREE ACCESS

Show abstractHide abstract

General consideration of compacting phenomena of ceramic clay powder under static pressure, effects of applied pressure on density and permeability in specified layers in green body were studied.
About the initial state of compacting process, the following expression were established,
P=c(w^-1-w₀^-1)δ²
where, P is applied pressure, δ the displacement, w the weight of charged powder, c and w₀ the constants defined only by the properties of powder.
The singular increase of displacement of powder, occured at the end of initial compacting state, were recognized and that is considered to be raised by the entire destruction of “BRIDGE STRUCTURE” constituted in compacting body.
Further, the change of permeability along the pressing direction in green body perform a curve with inflection point in a case of spherical powder.
Finally we observed that the Smith's and Kieffer's formulas for metal powder could not established experimentally in pressing of ceramic clay powders, in general.
12 Figs., 3 Tables, 19 References.

View full abstract

Download PDF (1133K)
A Consideration to the Dimensions of Melting End of Glass Tank Furnaces

Akira NARUSE

1955 Volume 63 Issue 706 Pages 97-101
Published: March 01, 1955
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.63.706_97

JOURNAL FREE ACCESS

Show abstractHide abstract

The minimum condition in regard to heatloss on walls of which melter has bridgewall type for colourless glass has been determined on its dimension and shape. This condition is assumed as the optimum condition of the melter and the optimum value of its depth, corresponding to its capacity and shape, is analysed mathematically. This optimum condition is determined by a relatively simple equation, if the form of lateral cross section of all tanks were a similar figure and state of heat transmission in the walls were not change with one another. But depths of various practical tanks have considerable low values compared with the optimum depths which are abtained by this calculation. However, ratio of the practical value to the latter has a linear relationship to the viume of melter. And then, this equations obtaines a significance as a standard for the design of glass melters. But, in order to determine the optimum condition as an ideal significance, other many complicated conditions must be introduced in this relation.

View full abstract

Download PDF (1803K)
Effect of Mineralizer on Dolomite Clinker from Coarse Granule

Yoshiaki SANADA, Kiyoshi MIYASAWA

1955 Volume 63 Issue 706 Pages 102-104
Published: March 01, 1955
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.63.706_102

JOURNAL FREE ACCESS

Show abstractHide abstract

The authors studied on manufacture of dolomite clinker from dolomite coarse granule for refractory use. The results obtained are as follows;
1) The rate of slaking of dolmite clinker was retarded by mineralizer containing Fe₂O₃ and TiO₂, but not by SiO₂.
2) TiO₂ and MnO have good effect in promoting anti-slaking property as submineralizer of Fe₂O₃.
3) Dolomite clinker was coated with mixtures of Fe₂O₃ and magnesite have greater anti-slaking property than it coated with Fe₂O₃ only.
4) Clinker added Fe₂O₃ is protected from slaking with one layer consists of composition Fe₂O₃/MgO≥1, but high magnesia clinker is protected with double layer; one layer consists of MgO obserbed a little of Fe₂O₃ and another composition Fe₂O₃/MgO≥1

View full abstract

Download PDF (609K)
[title in Japanese]

1955 Volume 63 Issue 706 Pages 104
Published: March 01, 1955
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.63.706_104

JOURNAL FREE ACCESS

Download PDF (227K)
On the Measurements of Reflectivity of Glass Surface marred by Falling Carborundum Powder

Yasushi HASEGAWA, S. KAWAKUBO

1955 Volume 63 Issue 706 Pages 105-109
Published: March 01, 1955
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.63.706_105

JOURNAL FREE ACCESS

Show abstractHide abstract

The decrease in the light reflection of ordinary window glass plates by marring them with falling carborundum powder was measured. Effects of grain size, falling rate, and falling height were deter-mined by using carborundum powders BC#40, #60, #80, #100 and GC#120 for the amounts ranging from 50g. to 2kg. and for the falling heights of 0.5, 1.0, and 1.5m. Apparatus for measuring the reflectivity and the method of its calibration by the standard optical wedge are described. Results are as follows: (1) The reflection of light decreases as the grain size becomes larger, as the falling rate becomes faster, and as the falling height becomes higher, and approaches to the saturation value which is different for each case. (2) For smaller grain size and for lower rate of fall of the carborundum powder, the reflectivity vs. grain size or rate of fall curves are not smooth, and the reflectivity rises step-wise with the increase of brain size or the rate of fall.

View full abstract

Download PDF (961K)
[title in Japanese]

[in Japanese]

1955 Volume 63 Issue 706 Pages 110-113
Published: March 01, 1955
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.63.706_110

JOURNAL FREE ACCESS

Download PDF (2315K)
[title in Japanese]

[in Japanese]

1955 Volume 63 Issue 706 Pages 114-118
Published: March 01, 1955
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.63.706_114

JOURNAL FREE ACCESS

Download PDF (1475K)
[title in Japanese]

[in Japanese]

1955 Volume 63 Issue 706 Pages 119-122
Published: March 01, 1955
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.63.706_119

JOURNAL FREE ACCESS

Download PDF (2003K)
[title in Japanese]

1955 Volume 63 Issue 706 Pages 123-126
Published: March 01, 1955
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.63.706_123

JOURNAL FREE ACCESS

Download PDF (844K)
Erratum

1955 Volume 63 Issue 706 Pages e1
Published: 1955
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1950.63.706_e1

JOURNAL FREE ACCESS

Download PDF (159K)

Register with J-STAGE for free!