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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Ceramic Society
Journal Basic Information
Journal DOI :
The Korean Ceramic Society
Editor in Chief :
Volume & Issues
Volume 17, Issue 4 - Apr 1980
Volume 17, Issue 3 - Mar 1980
Volume 17, Issue 2 - Feb 1980
Volume 17, Issue 1 - Jan 1980
Selecting the target year
Defect Structure and Electrical Conductivity of Gadolinium Sesquioxide
Journal of the Korean Ceramic Society, volume 17, issue 1, 1980, Pages 5~7
The electrical conductivity of polycrystalline
has been measured over the temperature range of 650 to 100
under the oxygen pressure range of
to 102 torr. The oxygen pressure dependence of electrical conductivity,
PO211/n is characterized by n value of about 5.3. The defect structure and the type of the oxide are controlled by triply ionized metal vacancies and holes.
High Temperature Stability for Refractories of the System
Journal of the Korean Ceramic Society, volume 17, issue 1, 1980, Pages 8~12
CaO was added to the
spinel, a main component of the mag-chro refractroies, by 0, 1, 5 and 10 mol% before sintering at 135
in air. The X-ray diffraction analysis produced an additional X-ray diffraction pattern of 8CaO.
besides that of
. The formation of 8CaO.
was interpreted as due to the presence of CaO.8CaO.
was unstable and easily vaporized. It was concluded that formation of the unstable pollutant 8CaO.
could be prevented in reducing atmospheres. It was found that the basic refractories containing
system would be more stable and much less toxic in reducing at mospheres than in oxidizing stmosphere.
Characteristics of Domestic Clay Minerals
Journal of the Korean Ceramic Society, volume 17, issue 1, 1980, Pages 13~19
Mineral identifications on halloysite in Hadong-Sancheong area and the halloysite bearing clay ii Yeoju, Yesan and Hampyeong-Muan area are carried out by the method of X-ray diffraction, electron microscopy and DTA. Chemical composition of the above minerals are analyzed by means of X-ray-fluorescence. Refractoriness are also measured by refractoriness tester. A standard diagram for quantitative analysis of halloysite is given.
Crystallization Mechanism of Slag-based Glass in
Journal of the Korean Ceramic Society, volume 17, issue 1, 1980, Pages 20~26
The crystallization behaviors of slag-based glass in
system have been studied. The mother glass containing 16.50 CaO, 7.50MgO, 19.70Al2O3, 50.80SiO3 and 2.09wt%
was prepared by using Korean domestic raw materials such as granulated slag, serpentine, sea sand and etc. The glass-ceramics composed of major crystalline phase diopside was produced by the heat treatment in a temperature range from 850
for 0-6hr. The composition and morphology of diopside phase formed in the system were examined by X-ray diffraction analysis and electron microscopy. The kinetic measurements such as J.M. A plot and Arrhenius plot indicated that the process of nucleation of the initially formed diopside phase could be described from the view point of instantaneous nucleation. It was also demonstrated that the linear crystal growth of diopside phase was proceeded by short range diffusion of
ion. The microstructures of the resulting glass-ceramics were consisted of leafroidal shaped crystalline aggregations.
A Study on the Physical Properties of Slag-based Glass-Ceramics
Journal of the Korean Ceramic Society, volume 17, issue 1, 1980, Pages 27~34
The synthesis of glass-ceramic materials from glasses based on industrial wastes or natural rocks their physical properties were studied. Glasses of composition, CaO14.7∼16.1, MgO7.4∼9.0, Al2O38.3∼19.3, SiO2 48.9∼51.0wt% were prepared from domestic blast furnace slag, serpentine, sea sand and etc. with additions of chromic oxide, and fluoride as nucleating agent. The glasses were subjected to controlled heat treatments and yielded fine microstructure of glass-ceramics which were composed of monocrystalline phase of aluminous diopside. X-ray diffraction techniques were adopted to identify the crystalline phases and to determine the degree of crystallization quantitatively. Density, coefficient of thermal expansion, young's modulus, microhardness and modulus of rupture were measured and the resulting properties were discussed in terms of the heat-treatment conditions, the degree of crystallization, species of crystaline phase, the microstructures formed in glass-cramics and the chemical compositions of mother glasses.
Study on the Alumina Extraction from Kaolin
Journal of the Korean Ceramic Society, volume 17, issue 1, 1980, Pages 35~41
Alumina extraction from raw Hadong kaolin with sulfuric acid was studied to obtain relatively pure alumina. Factors as acid concentration, heating temperature and conditions of ammonium alum crystal formation from extracted solution are also surveyed and most of iron oxide in kaolin is eliminated in crystallization of ammonium alum. Pure crystal obtained from the extracted solution with ammonium sulfate is relatively free from iron containment in mother liquor. Alumina in ammonium alum crystal is converted to gibbsite form after complete hydrolysis in ammonia gas.