권호 표지

Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society

  • Bimonthly
  • /
  • 1229-7801(pISSN)
  • /
  • 2234-0491(eISSN)

Domain

  • Materials ＞ Ceramic Materials
  • Materials ＞ Analysis/Characteristics Evaluation technology

Aim & Scope

The Journal of Korean Ceramic Society publishes the original and significant results of experimental and theoretical research relating to all categories of ceramics including composites and hybrids. The journal aims at providing an international forum for fundamental understanding and applied knowledge of the relationship between processing, microstructure and properties of ceramics. The scope of the journal includes basic science and classical ceramics, engineering ceramics, electronic and energy ceramics, noncrystalline ceramics, ceramics related to nanoscience, bioceramics, and emerging fields of ceramics. The Journal of Korean Ceramic Society is a peer-reviewed international journal. It features three types of submissions: Full Length Paper, Review Paper, and Communications which contain reports of original research and reviews on all aspects of ceramics and ceramics-based composites ranging from fundamentals to application.

http://211.116.129.33/home/kor/article/submission/submission_login_form.asp?globalmenu=3&localmenu=0 KSCI KCI SCOPUS

Volume 43 Issue 9 Serial No. 292

  1. Kim, Hee-Seung;Seo, Mi-Young;Kim, Ik-Jin 515
    https://doi.org/10.4191/KCERS.2006.43.9.515 PDF KSCI
    The microstructure of $ZrO_2$ toughened $Al_2O_3$ ceramics was carefully controlled so as to obtain dense and fine-grained ceramics, thereby improving the properties and reliability of the ceramics for capillary applications in semiconductor bonding technology. $Al_2O_3-ZrO_2(Y_2O_3)$ composite was produced via Ceramic Injection Molding (CIM) technology, followed by Sinter-HIP process. Room temperature strength, hardness, Young's modulus, thermal expansion coefficient and toughness were determined, as well as surface strengthening induced by the fine grained homogenous microstructure and the thermal treatment. The changes in alumina/zirconia grain size, sintering condition and HIP treatment were found to be correlated.
  2. Kwon, Sung-Wook;Darsono, Nono;Yoon, Dang-Hyok 519
    https://doi.org/10.4191/KCERS.2006.43.9.519 PDF KSCI
    A full-factorial design of experiments with three input factors and two levels for each factor including center points was utilized for the preparation and characterization of twelve types of $BaTiO_3$ slips for tape casting. Ceramic powders with different particle sizes, different milling methods such as high energy milling and conventional ball milling, and two types of dispersant with different polymeric species were chosen as input factors in order to investigate their effects on slip and on green tape properties. Tape casting, a small rectangular-shaped K-square preparation, characterization and quantitative data analysis using statistical software were followed. Ceramic powder was the most significant among three input factors for the output responses of slip viscosity and green tape density, showing more favorable results with large particles than with very fine ones. In addition, high energy milling for only 30 min was more efficient than 24h of conventional ball milling in terms of powder dispersion and milling. The optimum condition based on the experimental results was a slip exposed to high energy milling with large ceramic particles along with a methylethyl acetate dispersant.
  3. Kim, Eung-Kwon;Kim, Young-Sung 527
    https://doi.org/10.4191/KCERS.2006.43.9.527 PDF KSCI
    In order to study the influence of post-annealing treatment on the frequency characteristics of the Li doped ZnO(Li:ZnO) FBAR(Film Bulk Acoustic Resonator) device, we investigated the material and electrical properties of Li:ZnO films in the annealing temperature range from 300 to $500^{\circ}C$. In our samples, as annealing temperature was increased, Li:ZnO films showed the improvement of high c-axis orientation and resistance value with relieved stress and low surface roughness. In addition to, the return loss in the frequency property of fabricated FBAR was improved by annealing treatment from 24.9 to 29.8dB. From experimental results, the optimum post-annealing temperature for FBAR is $500^{\circ}C$ and it can obtain excellent Li:ZnO FBAR performance with stronger c-axis orientation, smoother surface, relieved stress, and lower loss factor.
  4. Kim, Bong-Seok;Kim, Eung-Kwon;Kim, Young-Sung 532
    https://doi.org/10.4191/KCERS.2006.43.9.532 PDF KSCI
    The annealing temperature effect of transparent conducting oxide film grown on glass substrate for solar cell application was studied in this paper. Using pulsed DC magnetron sputtering with 1 at% Al-doped ZnO target, TCO films were deposited on coming 7059 glass at room temperature. Al:ZnO thin films were annealed at 200, 400, Al $600^{\circ}C$ for 10 min and annealing resulted in lower biaxial compressive stress of about 1GPa and increased average crystallite size in all films. The as-grown film shows the resistivity of $1{\times}10^{-2}{\Omega}{\cdot}cm$ and transmittance under 80%, whereas the electrical and optical properties of film annealed at $400^{\circ}C$ are enhanced up to $5{\times}10^{-4}{\Omega}{\cdot}cm$ and 85%, respectively.
  5. Jeong, Chan-Il;Lee, Eui-Hak;Lee, Kyung-Hee 537
    https://doi.org/10.4191/KCERS.2006.43.9.537 PDF KSCI
    Length change, hydration heat, setting time and compressive strength of OPC were measured by adding KCl and replacing limestone powder so as to examine the influence of limestone powder on hydration of the OPC contained much chloride. In general, the chloride modified cement was high in heat of hydration, short in its setting time, low in its fluidity and low in its strength at 28 days due to the sudden hydration in its initial stage. As a result of the experiment, it has been demonstrated that heat of hydration, became low as one replaced limestone powder to the chloride modified cement, and the fluidity and shrinkage rate of mortar decreased without change in setting time; furthermore, the compressive strength at 28 days was improved.
  6. Kim, Cheol-Young;Lim, Hyong-Bong;Cho, Nam-Kwon;Kwak, Hee-Youl 544
    https://doi.org/10.4191/KCERS.2006.43.9.544 PDF KSCI
    The sealing technique between a glass tube and a copper heat pipe in an evacuated tube solar collector is studied. In this study two different sealing techniques, such as flame method and furnace firing, are examined. After the sealing of a copper to a glass, the oxidation state of the copper and its bonding morphology were examined by SEM and XRD. Its oxidation was retarded by coating of borate solution on the copper, and $Cu_2O(cuprite)$ turned into CuO(tenorite) with increase in a firing temperature and firing time. Porous structure was found in the oxide layer when CuO formed. The best sealing morphology was observed when the thickness of the oxidation layer was less than $20{\mu}m$. The sealing technique performed in a furnace was promising and the satisfactory result was obtained when the sample was fired at $950^{\circ}C$ for 5 min under $N_2$ atmosphere. Annealing procedure is recommended to remove the stress left at the bonding zone.
  7. Eom, Jung-Hye;Jang, Doo-Hee;Kim, Young-Wook;Song, In-Hyuck;Kim, Hai-Doo 552
    https://doi.org/10.4191/KCERS.2006.43.9.552 PDF KSCI
    A low temperature processing route for fabricating porous SiC ceramics by carbothermal reduction has been demonstrated. Effects of expandable microsphere content, sintering temperature, filler content, and carbon source on microstructure, porosity, compressive strength, cell size, and cell density were investigated in the processing of porous silicon carbide ceramics using expandable microspheres as a pore former. A higher microsphere content led to a higher porosity and a higher cell density. A higher sintering temperature resulted in a decreased porosity because of an enhanced densification. The addition of inert filler increased the porosity, but decreased the cell density. The compressive strength of the porous ceramics decreased with increasing the porosity. Typical compressive strength of porous SiC ceramics with ${\sim}70%$ porosity was ${\sim}13 MPa$.
  8. Nahm, Choon-Woo 558
    https://doi.org/10.4191/KCERS.2006.43.9.558 PDF KSCI
    The electrical and dielectric properties of $ZnO-Pr_6O_{11}CoO-Cr_2O_3La_2O_3-based$ nonlinear resistors were investigated at different sintering temperatures in the range of $1230{\sim}1300^{|circ}C$. As the sintering temperature increased, the breakdown voltage decreased from 777.9 to 108.0V/mm, the nonlinear coefficient greatly decreased from 77.0 to 7.1, and the leakage current increased from $0.4{\mu}A\;to\;50.6{\mu}A$. On the other hand, the donor density from $0.90{\times}10^{18}\;to\;2.59{\times}10^{18}/cm^3$ and the barrier height decreased from 1.89 to 0.69 eV with increasing temperature. The dielectric dissipation factor increased from 0.0879 to 0.2839 for the increase of sintering temperature.
  9. Choe, Dong-Uk;Park, Byung-Ki;Lee, Jung-Min 564
    https://doi.org/10.4191/KCERS.2006.43.9.564 PDF KSCI
    AlO(OH) nano gel is used in precursor of ceramic material, coating material and catalyst. For use of these, not only physiochemical control for particle morphology, pore characteristic and peptization but also studies of synthetic method for preparation of advanced application products were required. In this study, AlO(OH) nano gel was prepared through the aging and drying process of aluminum hydroxides gel precipitated by the hydrolysis reaction of dilute NaOH solution and aluminum sulfate solution. In this process, optimum synthetic condition of AlO(OH) nano gel having excellent pore volume as studying the effect of water and aluminum sulfate mole ratio on gel precipitates has been studied. Water and aluminum sulfate mole ratio brought about numerous changes on crystal morphology, surface area, pore volume and pore size. Physiochemical properties were investigated as using XRD, TEM, TG/DTA, FT-IR, and $N_2$ BET method.
  10. Lee, Hoi-Kwan;Yoo, Eun-Sung;Chae, Su-Jin;Kang, Won-Ho 569
    https://doi.org/10.4191/KCERS.2006.43.9.569 PDF KSCI
    Transparent glass-ceramics containing fresnoite crystals have been prepared by controlled heat treatment in $K_2O-BaO-TiO_2-SiO_2$ and their nonlinear optical and luminescent properties were investigated using Maker fringe method and Spectrofluorometer. The second harmonic generation was observed in all samples and the values decreased with increasing $K_2O$ content. The luminescence of blue light at ${\sim}482nm$ could be observed and it was shown that the luminescent property was controlled by the $K_2O$ content.
  11. Choe, Dong-Uk;Park, Byung-Ki;Suh, Jeong-Kwon;Lee, Jung-Min 575
    https://doi.org/10.4191/KCERS.2006.43.9.575 PDF KSCI
    To precipitate the complex gel of flux and aluminum hydroxides gel, aqueous solution of the mixture of $Na_2CO_3\;and\;Na_2PO_4{\cdot}12H_2O$ was added with stirring in aqueous solution of the mixture of $Al_2(SO_4)_3{\cdot}14{\sim}18H_2O,\;Na_2SO_4$, and then the complex gel was aged in $0{\sim}30h\;at\;90^{\circ}C$. As aging time passed, the aluminum hydroxides was grown into the acicular AlO(OH) gel. Also, aging time had an effect on physical properties of the AlO(OH) gel and on crystal growth of the flaky ${\alpha}-Al_2O_3$ prepared by molten-salt precipitation. In this study, the complex gel was crystallized in temperature range of $400{\sim}1,200^{\circ}C$ after drying at $110^{\circ}C$, and then it was investigated to effect of aging time on precipitation temperature, size, thickness, morphology and particle size distribution of the flaky ${\alpha}-Al_2O_3$ crystal. As aging time passed, the flaky a${\alpha}-Al_2O_3$ crystal showed a tendency toward an increase in size and thickness as result from an increase in BET surface area and pore volume of the acicular AlO(OH) gel.
  12. Choi, Do-Mun;Lee, Jin-Seok;Choi, Sung-Churl 582
    https://doi.org/10.4191/KCERS.2006.43.9.582 PDF KSCI
    Decomposition behavior of $ferro-Si_3N_4$was investigated with varying temperature and holding time in mud components for high temperature refractory applications. Porosities gradually increased with increasing temperature and holding time due to the carbothermal reduction of $Si_3N_4\;and\;SiO_2$. Silicon monoxide (SiO) as a intermediate resulted from evaporation of $Si_3N_4\;and\;SiO_2$ reacted with C sources to generate needle-like ${\beta}-SiC$ and Fe in $Si_3N_4$ acted as a catalyst in order to enhance growth of SiC grain with the preferred orientation. SiC generation yield increased with increasing holding time, all of the $Si_3N_4\;and\;SiO_2$ affected on SiC formation up to 2h. However, SiC generation was only dependent on residual $SiO_2$ over 2h, because the carbothermal reduction reaction of $Si_3N_4$ was no longer possible at that time.
  13. Jang, Chang-Hyun;Nersisyan Hayk;Won, Chang-Whan;Kwon, Hyuk-Sang 588
    https://doi.org/10.4191/KCERS.2006.43.9.588 PDF KSCI
    Spinel phase $LiMn_2O_4$ is of great interest as cathode materials for lithium-ion batteries. In this study, SHS (Self propagating High-temperature Synthesis) method to synthesize spinel $LiMn_2O_4$ directly from lithium nitrate, manganese oxide, manganese and sodium chloride were investigated. The influence of Li/Mn ratio, the heat-treated condition of product have been explored. The resultant $LiMn_2O_4$ synthesized under the optimum synthesis conditions shows perfect spinel structure, uniform particle size and excellent electrochemical performances.