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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Crystal Growth and Crystal Technology
Journal Basic Information
Journal DOI :
The Korea Association of Crystal Growth
Editor in Chief :
Volume & Issues
Volume 25, Issue 6 - Dec 2015
Volume 25, Issue 5 - Oct 2015
Volume 25, Issue 4 - Aug 2015
Volume 25, Issue 3 - Jun 2015
Volume 25, Issue 2 - Apr 2015
Volume 25, Issue 1 - Feb 2015
Selecting the target year
A study on the dependance of crucible dimension on AlN single crystal growth
Yin, Gyong-Phil ; Kang, Seung-Min ;
Journal of the Korean Crystal Growth and Crystal Technology, volume 25, issue 1, 2015, Pages 1~5
DOI : 10.6111/JKCGCT.2015.25.1.001
For the special usage, the effort of developing AlN single crystals has been very hot in the world. The AlN-base UV LEDs are used on the field of sterilization, purification, curing and analyzing, which can advance human`s living and medical processes etc.. AlN single crystals were grown by the PVT (Physical vapor transport) method. On the growing process, carbon crucibles with three different types such as normal size, taller than normal and wider than normal were used for comparison. The processing temperature was in the range of
and ambient pressure was 200~1 Torr. When the taller crucible was used, the sublimation mass was greater than normal dimension one but the best condition of growth changes widely. However the wider one gave much sublimation mass and growing condition was more stable than normal dimension. On limited growing furnace system, the changes of crucible dimension of PVT method provide the change of best condition for growth rate, as-grown crystal quality and growth condition stability.
Application of rate-controlled sintering into the study of sintering behavior of boron carbide
Lee, Hyukjae ;
Journal of the Korean Crystal Growth and Crystal Technology, volume 25, issue 1, 2015, Pages 6~12
DOI : 10.6111/JKCGCT.2015.25.1.006
Under rate-controlled sintering, furnace power is controlled to maintain a specific specimen contraction rate. This thermal processing method guarantees continuous process with a minimum thermal energy applied over time and makes it possible to control the density of the sintered body precisely. In this study, the rate-controlled sintering is applied to the sintering of
in order to investigate how rate-controlled sintering variables can affect the sintering behavior and/or grain growth behavior of
and how the results can be interpreted using sintering theories to draw an optimal sintering condition of the rate-controlled sintering. Further, the applicability of the rate-controlled sintering into the study for sintering of unknown materials is also considered.
The relationship between minority carrier life time and structural defects in silicon ingot grown with single seed
Lee, A-Young ; Kim, Young-Kwan ;
Journal of the Korean Crystal Growth and Crystal Technology, volume 25, issue 1, 2015, Pages 13~19
DOI : 10.6111/JKCGCT.2015.25.1.013
Among the various possible factors affecting the Minority Carrier Life Time (MCLT) of the mc-Si crystal, dislocations formed during the cooling period after solidification were found to be a major element. It was confirmed that other defects such as grain boundary or twin boundary were not determinative defects affecting the MCLT because most of these defects seemed to be formed during the solidification period. With a measurement of total thickness variation (TTV) and bow of the silicon wafers, it was found that residual stress remaining in the mc-Si crystal might be another major factor affecting the MCLT. Thus, it is expected that better quality of mc-Si can be grown when the cooling process right after solidification is carried out as slow as possible.
Characterization and synthesis of aqueous pink-red ceramic ink for digital inkjet printing
Lee, Won-Jun ; Hwang, Hae-Jin ; Han, Kyu-Sung ; Cho, Woo-Suk ; Kim, Jin-Ho ;
Journal of the Korean Crystal Growth and Crystal Technology, volume 25, issue 1, 2015, Pages 20~26
DOI : 10.6111/JKCGCT.2015.25.1.020
Ceramic ink-jet printing technology in art tiles, decorated tablewares and other porcelain products has many advantages of fast and precision printing of various images with high efficiency and low cost. For the application to ink-jet printing, ceramic ink requires a stable dispersibility with nano-sized pigments. In this paper, characteristics of pink-red aqueous ceramic ink for ink-jet printing was demonstrated.
pigment was synthesized using solid state reaction and deagglomerated using attrition milling. The aqueous ceramic ink contains 10 wt% of the obtained
nanopigment with 0.4 wt% of sodium dodecyl sulfate (SDS) as a dispersion agent. Viscosity of
aqueous ceramic ink was adjusted using 0.18 wt% of polyvinyl alcohol (PVA) for a suitable jetting from the nozzle. The prepared pink-red ceramic ink showed a good jetting property with formation of a single sphere-shaped droplet after
without a tail and satellite droplet.
Effects of the incidence angels of solid particles on the erosion of castable refractories
Shin, Min ; Yoon, Jong-Won ; Kim, Chang-Sam ;
Journal of the Korean Crystal Growth and Crystal Technology, volume 25, issue 1, 2015, Pages 27~31
DOI : 10.6111/JKCGCT.2015.25.1.027
The degradation of refractories can be caused by erosion, friction of abrasive particles, as well as by corrosion by molten slag in the gasification reactors. There was little knowledge about the erosion of refractories so far. The castable refractories of which the maximum applying temperature of 1300 and
were abraded using SiC particles varying the incidence angles. It was revealed that the maximum abrasion was occurred at the incidence angle of
and thought that the porosity of the refractories was the principle factor.
A study on growing of bulk AlN single crystals grown having a (011) growth face of by PVT method
Kang, Seung-Min ;
Journal of the Korean Crystal Growth and Crystal Technology, volume 25, issue 1, 2015, Pages 32~34
DOI : 10.6111/JKCGCT.2015.25.1.032
AlN Single Crystal were grown by PVT (Physical vapor transport) method on bulk seed. It was performed by high-frequency induction-heating coil. AlN source powder was loaded at bottom side of the carbon crucible and the crystal seed was loaded at the upper side of the crucible. The temperature conditions of the growth was varied
and the surrounding pressure was
Torr. And the hot-zone of the heating position was controlled elaborately according to growth. The 17 mm-diameter, 7 mm-thickness AlN single crystal is obtained for about 600 hours growing. It was recognized that the growth direction of as grown crystal was R by the Laue X-Ray camera measurement.
Fabrication and analysis of luminous properties of ceramic phosphor plate for high-power LED
Ji, Eun-Kyung ; Song, Ye-Lim ; Lee, Min-Ji ; Song, Young-Hyun ; Yoon, Dae-Ho ;
Journal of the Korean Crystal Growth and Crystal Technology, volume 25, issue 1, 2015, Pages 35~38
DOI : 10.6111/JKCGCT.2015.25.1.035
LEDs are considered to be an alternative for enhancement of energy efficiency, applied for numerous areas such as display, automotive headlight not only lights. Yellow phosphor is generally utilized with blue LEDs to generate WLED,
is typically used as the yellow phosphor. The phosphor, mixed with epoxy resin, has been used by being spread and hardened on the blue LED chip. This paste-based packaging gives rise to problems of degradation of phosphor by heat and decrease of luminous efficiency. Although phosphor plate is used instead of the epoxy-phosphor mixture to solve these problems, loss of luminous efficacy by total internal reflection inside the plate also should be solved. In this study, we coated the side of the plate with silver as one of the solution.
Evaluation of cement mortars blended with copper alloy slag
Lee, Jung-Il ; Hong, Chang Woo ; Ryu, Jeong Ho ;
Journal of the Korean Crystal Growth and Crystal Technology, volume 25, issue 1, 2015, Pages 39~43
DOI : 10.6111/JKCGCT.2015.25.1.039
The cement mixtures such as flyash, iron-slag and silica fume have been actively studied in order to increase the quality of concrete. In this study, the grinded copper-slag with different proportion was added to portland cement. The physical properties of the cement mortars, (i.e.) flowability, absorption, compressive strength and flexural strength, were investigated for the potential application to the cement. Also, the influence of the acid on the chemical resistance of the cement mortars with copper-slag was evaluated by monitoring the weight variation of the cement mortars under 5 % sulfuric acid for 28 days.