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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Ceramic Society
Journal Basic Information
Journal DOI :
The Korean Ceramic Society
Editor in Chief :
Volume & Issues
Volume 20, Issue 4 - Apr 1983
Volume 20, Issue 3 - Mar 1983
Volume 20, Issue 2 - Feb 1983
Volume 20, Issue 1 - Jan 1983
Selecting the target year
glass by the sol-gel process
Journal of the Korean Ceramic Society, volume 20, issue 1, 1983, Pages 3~12
In the present study an attempt was made to synthesize the
glass in which atomic ratio is Al:Si=1:1 by sol-gel process. And at such a low temperature as 55
clear amorphous gel derived glass with Si-O-Al bonding was obtained.
were used as the precursor and among the mutual solvents only n-butanol gave good results for the synthesis of the gel derived glass. Partial hydrolysis of TEOS with one-fold mol of
prior to the reaction with aluminum nitrate gave the better results., Total oxide content to the total reactants by weight was affective to the results.
Dissociation characteristics and thermal phase changes of Korean limestones
Journal of the Korean Ceramic Society, volume 20, issue 1, 1983, Pages 13~18
The investigations have been carried out to study the characteristics of limestone using in Korean cement industry with prime interests in the dissociation and thermal phase changes of limestone between 90
The range of decomposition temperature of limestone was 840-87
and it was considered that the temperature was lowered by impurities in the limestone. The more the impurities and the finer the grain size of quartz in limestone the lower temperature was applied in forming
mineral the temperature of about 100
. The major clinker minerals such as
were formed in most of limestone when the firing temperature was up to 130
A Study on the Dielectric Properties of PZT Ceramics with 2 and 6 Valent Additives
Journal of the Korean Ceramic Society, volume 20, issue 1, 1983, Pages 19~24
Dielectrics used as capacitor was studied in the system of
Curie tempera-tures of
respectively. When these materials formed solid solution the more amount of
was increased the more Curie temperature lowered and dielectric constant increased. Higher dielectric constants were measured in the solid solution of which X-Ray diffraction patterns were changed. Especially Curie temperature and dielectric constant were 85
and 4159 respectively in the composition of 60
. Also in this composition ferroeletric material with thermal stability was obtained.
A Study on the Forming of Solid Solution in CaO.MgO.
Journal of the Korean Ceramic Society, volume 20, issue 1, 1983, Pages 25~30
This experiment was studied in the system of (1-x) CaO MgO
to investigate forming of solid solution. The technique empolyed was the well known water-quenching method. Differential thermal analysis of the each glass water quenched indicated that under 30 mole%
was lowered with increasing of the amount of
It was supposed by X-ray diffraction patterns of each specimen sintered at various temperature that only solid solution was formed under the 30mole %
compositions solid solution and anorthite were formed at the 20mole%
composition anorthite solid solution and spinel
were formed over the 40mole%
compositions. The maximum density and thermal expanison coefficient was 2.89g/cm 7.74x106./C
respectively in the composi-tion of 10 mole%
. All the specimens showed linear thermal expansion behavior. Microhardness was as high as 850kg/nm2 in the composition of 5, 10, 20 mole %
and dielectric constant was 7.3-6.9
Photoelectrodchemical Conversion by Polycrystalline
Journal of the Korean Ceramic Society, volume 20, issue 1, 1983, Pages 31~36
The photoelectrochemical conversion by polycrystalline
electrodes is effected by applied voltage oxidized
thickness temperature and concentration of a, P. E. C cell. Anodic current starts at -0.8V in 1N-NaOH solu-tion and photocurrent appears around 420nm frequency. And the emf of the cell drops with the rate of 58.5mV/PH.
The Study of
System in Fluro-phlogopite Synthesis.
Journal of the Korean Ceramic Society, volume 20, issue 1, 1983, Pages 37~42
An attempt was made to derive a possible synthetic mechanism of Fluoro-phlogopite (Mica, 4Mg.
) The pevention of fluorine vaporization turned out to be the key in the synthesis of Mica in question.l Consequently the quinary system of Mica was seperately synthesized ; frist 4MgO.
(ternary system) was sintered at 135
were added and second 4MgO.
(quarternary system) was heat-treated at 135
was added. The ternary system resulted in Proto-enstatite Cordierite and Spinel phases while Forsterite and Leucite were shown in the quarternay system . In both methods Fluoro-phlogopite was systhesized but the solid state reactions to form Mica from the ternary system and the quarternary system were different. High temperature reactions in the formation of Mica were investigated employing XRD, DTA and SEM The study of the synthesis of Mica indirectly suggested a method of phase analysis of quinary system(MgO-
) and quarternary system(MgO-
) at various temperatures.
from the Mixtures of
Journal of the Korean Ceramic Society, volume 20, issue 1, 1983, Pages 43~48
The formation of strontium titanate from several molar
mixtures was studied in air and
gas Mixtures of
were heated in air at 400-
DTA-TG was used to obtain thermal histories of simples heated in air and
gas. X-ray diffraction analysis was used to determine both the phase composition and the amounts of each phase present. The phase relationship of various compounds
formed by the sintering in each composition was shown by the calibration curves. High temperature X-ray analysis was used to determine both the formation process and deformation process of each products. Small amount of SrTiO3 is formed first at the surface af contact SrTiO3 reacts with
to form Sr2TiO4 this is affected on the
The Effect of Al Powder as an Additive on the Sintering of
(I. In air,
Journal of the Korean Ceramic Society, volume 20, issue 1, 1983, Pages 49~54
The main object of this study is to investigate the effect of Al powder as an additive on the sintering of calcined alumina comparing with that of calcined alumina alone. The degree of Al oxidation is calculated by measuring the weight increase during the firing Water absorption bulk density and compressive strength of the
system at each temperature are compared with those of
system shows better physical propeties than Al2O3 alone and it seems by the SEM observation that the fine oxidized Al particles(fine
particles submicron unit) fill the interstices of the original
par-ticles and thus result in the well-close-packed arrangement of the particles.
Preparation of Dense Polycrystalline Hydroxyapatite Ceramics for the Application of Tooth Implants
Journal of the Korean Ceramic Society, volume 20, issue 1, 1983, Pages 55~62
the preliminary work on the prepartion of fine hydroxyapatite powder and the synthesis of dense hydroxyapatite ceramic from the powder were investigated for the development of artificial bone and tooth materials for implants. The effects of the process variables such as compositions of the raw materials the initial pH of the solutions and sintering temperature on the physical properties were investigated in order to determine the optimum conditions for the fabrication of tooth implant material. As the initial pH of the solutions was increased in the range of 10-11.6 the initial particle size of precipitates was decreased thus the sinterability of precipitates was improved. It was found that the composition of calcium rich of 1.75 in Ca/P mole ratio exhibited better sinterability and mechanical strength of the apatite ceramics for example the highest value of Vicker's hardness obtained from the compositions of 1.75 in Ca/P mole ratio was 764±30 Kg/mm2 compared to the maximum value of 600 kg/mm2 obtained from the compositions of 1.67 in Ca/P mole ratio.
Bonded SiC Ceramics
Journal of the Korean Ceramic Society, volume 20, issue 1, 1983, Pages 63~69
It is know that
bonded SiC has almost all the valuable properties needed for the high temperature material and thus has bery wide range of applicability. Si powder and two different sized SiC powder were used as the raw mateials. Specimens were prepared by heating the green compact mode of the raw materials with polyvinyl alcohol binder in the nitrogen atmosphere. The bond-ing of SiC particles is brought about with the formation of reaction bonded silicon nitride phase between the particles he influences of the variation of the relative amounts of the raw materials and the amount of the organic binder on the density and the bend strength of the specimens were investigated. It was shown that the calculation of the amount of the nitridation of Si is somewhat complicated matter since some portion of the organic binder reacts with the Si during the firing process. Fixing the Si amount to 20w/o the distributions of the size of the SiC particles that gives the maximum density and the maximum strnegth were obtained through experiments. It was observed that the two distributions were not equal to each other. As the amount of Si increased the amount of Si reacted with nitrogen and the strength increased. The fracture mode was intergranular for the most part and the transgranular fracture was scarcely observed.
Glass to Metal Bonding by Electric Field
Journal of the Korean Ceramic Society, volume 20, issue 1, 1983, Pages 70~78
This paper discusses the application of Si-Borosilicate glass sealing to a new sealing method which utilizes a large electrostatic field to pormote bound formation at relatively low temperature. Bonding mechanism and the effect of bonding time bonding temperature glass thickness and surface roughness on the bond strength were investigated. Application of a de voltage across bonded specimen gradually produced a layer of glass adjacent silicon which was depleted of mobile ions. As a consequence a n increasingly larger fraction of the applied voltage appeared across the depleted region and very large electric field resulted This field accompanyed by large electrostatic force acted as driving force the of strong bond. And stronger bond was formed with increasing bonding time and temperature. A low temperature preoxidation is advantageous for the Si surface having a rougher surface finish that 1 microinch.