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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 23, Issue 6 - Jun 1986
Volume 23, Issue 5 - May 1986
Volume 23, Issue 4 - Apr 1986
Volume 23, Issue 3 - Mar 1986
Volume 23, Issue 2 - Feb 1986
Volume 23, Issue 1 - Jan 1986
Selecting the target year
Study on Effect of Fluorine Content on the Synthesis of Machinable Glass-ceramics Based on Fluorophlogopite Crystals
Journal of the Korean Ceramic Society, volume 23, issue 4, 1986, Pages 1~10
The crystallization behaviour and the machinability of mica glass-ceramics with the content of F1 were studied. The material was made from the
glasses by the heattreatment at 80
where the content of F-1 was changed in the range from 1, 3wt% to 6.1wt%. X-ray diffraction phase analysis and optical observation were adopted to study the crystallization behaviour. The machinability was measured by a manual sawing test and MOR. The crystal phases of these glass-ceramics identified by XRD were chondrodite fluoborite and norbergite at low temperature but fluorophlogopite at high temperature. The crystallization of glasses containing 1.3wt% -2.5wt% F-1 were predominately controlled by surface crystallization while the crystallization of glasses containing 3.8 wt% -6.1wt% F-1 were controlled by volume crystallization. Among the test the best machinability and strength value were obtained from those specimens contained fluoride 4.2wt% -4.4wt% and when the heattreatment was performed at 95
for 2 hours.
Powder by Coprecipitation Method
Journal of the Korean Ceramic Society, volume 23, issue 4, 1986, Pages 11~16
ceramics powder was prepared by coprecipitation method either in oxalic acid solution or in potassium hydroxide solution. Thermal decomposition of coprecipitated
powder in oxalic acid solution was investigated by means of Themogravimetry Differential Thermal Analysis and X-ray Diffraction Analysis. Low temperature decomposition of coprecipitated
caused narrow particle size distribution whereas high temperature decomposition caused fairly wide particle size distribution by partial sintering. As the reaction time increased the average particle size of coprecipitated
powder in KOH solution was increased. The most narrow paticle size distribution was obtained when the coprecipi-tates were ripened for 4hrs.
Mechanical Properties of
-Sialon Prepared from Wando Pyrophyllite
Journal of the Korean Ceramic Society, volume 23, issue 4, 1986, Pages 17~22
-Sialon powders were prepared by the reduction-nitridation reaction from the mixture of Wando-pyrophyllite and graphite at 135
-Sialon powders were sintered at 175
by the pressureless sintering for 90min and the hot-pressing for 60 min respectively. All the sintered bodies showed their relative densities higher than 94% The values of M.O.R fracture toughness(KIC) and hardness showed 32.9kpsi 2.9MN/
for the pressure-less sitnered bodies and 48.6kpsi, 4.6 MN/
for the hot-pressed bodies respectively.
A Study on Stabilized CdS-CdSe Red Stain A Study on Zircon Cadmium Sulphoselenide Stain
Journal of the Korean Ceramic Society, volume 23, issue 4, 1986, Pages 23~26
The synthetic conditions of
stains from CdS, Se,
and Lif were investigated and the colors were examined. Colors of the stains prepared were yellow orange red pink ruby and violet in relation to both the content of CdS-Se in
and firing temperature. Colors of these series stains were thermally stabilized probably by the structural stability of zirconium silicate. Furthermore by the result of X-ray diffraction analysis it is assumed that color of the zircon cadmium sulphoselenide
stain is developed by neither the coloring ions in
lattice nor the solid solution of
but by the small crystals of
being occluded by the zirconium silicate during sintering process.
Glass by Sol-Gel Process
Journal of the Korean Ceramic Society, volume 23, issue 4, 1986, Pages 27~34
In the present study an attempt was made to synthesize
glass by Sol-Gel process. Tetra-ethyl-ortho-silane and titanium-iso-propoxide were used as precursors. As the mutual solvent ethanol and iso-propanol were used. TEOS was partially hydrolyzed with one-fold mole of
prior to the reaction with titanium-iso-propoxide to control the difference of hydrolysis rate of the two metal alkoxides. At gelling temperature higher than 6
it was difficult to obtain monolithic gels. At such a low temperature as 85
clear amorphous gel derived glass with Si-O-Ti bonding was obtained.
Analysis of Production Process of Fine Size Fraction of Korean Kaolin by Ball Mill Grinding I
Journal of the Korean Ceramic Society, volume 23, issue 4, 1986, Pages 35~40
The production process of a fine size fraction of Korean kaolin by ball milling is studied in this paper by analyzing the size distribution the size distribution of products with the Rosin-rammle formular and the rate process of cumulative size fractions with Alyavdin-Chujyo's formular. The size distribution is found to be divided in three regions a coarser part influenced by feed size an intermediate part where the size distribution shows a clear straight line relationship on Rosin-Rammler chart and the finest part with the ultimate limit of fineness by ball milling. Alyavdin-Chujyo's relationship is found to be valid over a very wide range of milling conditions. For different feed sizes the Alyavdin-Chujyo's relationship gives a group of straight lines with a common intersection point which can be defined as the limiting point of the persistent component region.
A Study on Atomosphere Sintering to affect the Abnormal Expansion in Solid-Solid Reaction of
Journal of the Korean Ceramic Society, volume 23, issue 4, 1986, Pages 41~46
When barium titanate was synthesized in solid-solid reaction the abnormal expansion occurred from 90
. The equi molecular mixture of
was sintered from 90
on the condition of air vacuum and
atomosphere. After that the specimens were tested closely with XDR Dilatometer and SEM The result indicated that: 1, Volume expansion to be synthesized barium titanate in solid-solid reaction was affected by atomosphere sintering. 2. The solid reaction ot fiorm barium titanate in vacuum atomosphere occurred faster than that in air atomosphere. In vacuum atomosphere the maxium volume expansion was about 30% at 90
for 2hrs, 3. The solid reaction to form barium titanate in
atomosphere occurred slower than that in air atomosphere. In
atomosphere the maximum volume expansion was 13% at 100
for 2 hrs. 4. According to the result of x-ray the expanison was caused by the reaction to form
A Study on the Wall Mobility of Magnetic Domain for the Singel Crystal
Journal of the Korean Ceramic Society, volume 23, issue 4, 1986, Pages 47~54
Since the wall mobility of bubble magnetic materials havin g the large q (q=Kac/2
) like a
has been found to be proportional to the wall energy theoretically crystallographical direction dependence of wall energy calculated by the basis on the spin configuration of the bubble wall which lies in the ac plane was compared with the crystallographical direction dependence of wall mobility which was measured by the experiment. The sample was a single crystal of
which was cut into plate normal to the C axis and polished t a thickness of about 60
The measurement of the wall mobility was carried out by optical system using the magneto-optic Faraday effect. From the good agreement of the crystallographical direction dependence of wall mobility and will energy it was found that the spin configuration of the bubble wall suggested is fair.
Planarization Effect of Steam Densified BPSG Film in HCl Atmosphere
Journal of the Korean Ceramic Society, volume 23, issue 4, 1986, Pages 55~61
Phosphosilicate glass(PSG) films have been used as fusable deposited dielectrics in silicon gate MOS integrated circuits. But in this experiment BPSG(borophosphosilicate glass) will be optimized for more efficient utilization of the reactants. The BPSG films were deposited on silicon wafers by the oxidation of the hydrides at 430
C in conventional atmospheric-pressure chemical-vapor-deposition (CVD) systems. Physical and chemical properties of CVD BPSG films have been characterized both for as-deposited and for fused films The. relationship between deposited BPSG film composition and infra-red absorption solution etch rate and fusion temperature is discussed and examples of BPSG composition that can be fused at 900~95
are given. In addition to having lower fusion temperature than PSG films BPSG films have lower as-deposited intrinsic tensile stress and low aqueous chemical etch rate they have been considered for applications where these characteristics are advantageous.
Electrical and Optical Properties of PLZT Ceramics Prepared by Flux Method
Journal of the Korean Ceramic Society, volume 23, issue 4, 1986, Pages 62~68
(PLZT X/65/35) powders were prepared by molten salt synthesis using NaCl-K Cl and conventional calcining of oxides. The effects of molten salt on formation and charactrization of PLZT powder and on dielectric piezolectric and optical properties of PLZT ceramics were studied, The completed PLZT powder formation in the presence of fused salt was attained at 50-10
lower temperature than that in solid state reaction and the particle size of the powder made by molten salt synthesis was markedly increased with increasing calcining temperature. The substitution of Na and/or K ions in NaCl-KCl for Pb ion in process of molten salt synthesis was increased with increasing La concentration Z. These substituted Na and/or K ions were identified as the origins of decreasing coupl-ing factor and optical transmittance of PLZT ceramics.
Single Crystal Growth
Journal of the Korean Ceramic Society, volume 23, issue 4, 1986, Pages 69~77
Single crystals of zinc tungstates were grown by the Czochralski method. To obtain the seed crystals various methods were employed including 4 points platinum wirse which dipped the melt and the capillary action from the melt led the 3 differently oriented seeds such as ,  and  directions. Optimum growing conditions were observed as neck diameter 2mm rotation speed 50-60 rpm maximum diameter 15mm and pulling rate 0-10 mm/hr. Dendrites covered on the olidified surface in a platinum crucible were turned out to be  direction because obviously this crystal has the strong  preferential growth habit. The (100) and (010) planes of single crystals showed the slip planes and the (010) plane showed the perfect cleavage surface.
Fibers by the Sol-Gel Process and its Properties
Journal of the Korean Ceramic Society, volume 23, issue 4, 1986, Pages 78~84
Zirconium acetate solution which was obtained from
was condensed polymerized and drawn to fibers by pulling method. Drawn gel fibers fired at 130
were short porous and mechanically weak. But addition of CaO about 13m/o caused the fibers to have the cubic structure and relatively dense microstructure. In order to clarify the condition for the synthesis of zirconia fibers viscosity measurement DTA-TG analysis X-ray diffraction infrared spectroscopy, SEM and specific surface area were studied.
Effects of Water on the Electrical Conductivity of Magnesium Metaphosphate Glasses
Journal of the Korean Ceramic Society, volume 23, issue 4, 1986, Pages 85~89
Electrical conductivity have been measured as function of temperature in MgO.
glasses containing small amounts of water. Conduction was due to the contribution of
and the mobility of protons in the glass increased linearly with increasing its concentration. The conductivity was pro-portional to the square of the proton concentration and the activation energy decreased linerly with increasing logarithm of the proton concentration, And $
was independent of the proton concentration but not on glass compositions.