Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Journal of Materials Research
Journal Basic Information
Journal DOI :
The Materials Research Society of Korea
Editor in Chief :
Volume & Issues
Volume 10, Issue 12 - Dec 2000
Volume 10, Issue 11 - Nov 2000
Volume 10, Issue 10 - Oct 2000
Volume 10, Issue 9 - Sep 2000
Volume 10, Issue 8 - Aug 2000
Volume 10, Issue 7 - Jul 2000
Volume 10, Issue 6 - Jun 2000
Volume 10, Issue 5 - May 2000
Volume 10, Issue 4 - Apr 2000
Volume 10, Issue 3 - Mar 2000
Volume 10, Issue 2 - Feb 2000
Volume 10, Issue 1 - Jan 2000
Selecting the target year
Fabrication and Characteristics of Anode-Supported Tube for Solid Oxide Fuel Cell
Kim, Eung-Yong ; Song, Rak-Hyeon ; Im, Yeong-Eon ;
Korean Journal of Materials Research, volume 10, issue 10, 2000, Pages 659~664
To develop anode-supported tubular cell with proper porosity, we have investigated the anode substrate and t the electrolyte-coated anode tube. The anode substrate was manufactured as a function of carbon content in the range of 20 to 50 vol.%. As the carbon COntent increased, the porosity of the anode substrate increased slightly and the carbon c content with proper porosity is found to be 30 vol.%. The anode-supported tube was fabricated by extrusion process a and the electrolyte layer was coated on the anode tube by slurry coating process. The anode-supported tube was cofired successfully at
in air. The porosity of the anode tube was 35%. From the gas permeation test, the anode t tube was found to be porous enough for gas supply. On the other hand, the anode-supported tube with electrolyte layer indicated a very low gas permeation rate. This means that the coated electrolyte was dense.
Bonding Characteristics of Directly Bonded Si wafer and Oxidized Si wafer by using Linear Annealing Method
Lee, Jin-Woo ; Gang, Choon-Sik ; Song, Oh-Seong ; Ryu, Ji-Ho ;
Korean Journal of Materials Research, volume 10, issue 10, 2000, Pages 665~670
Linear annealing method was developed to increase the bond strength of Si wafer pair mated at room temperature instead of conventional furnace annealing method. It has been known that the interval of the two mating wafer surfaces decreases and the density of gaseous phases generated at the interface increases with increase in an-nealing temperature. The new annealing method consisting of one heat source and light reflecting mirror used these two phenomena and was applied to Si
Si and Si
bonding. The bonding interface observed directly by using IR camera and HRTEM showed clear bonding interface without any unbonded areas except the area generated by the dusts inserted into the mating interface at the room temperature. Crack opening method and direct tensile test was appplied to measure the bond strength. The two methods showed similar results. The bond strength increased continuoustly with the increase of annealing temperature.
Effect of Partially Oxidized Ti Powder on Electrical Properties and Microstructures of
Kim, Jun-Gyu ; Jo, Won-Seung ; Park, Gyeong-Sun ;
Korean Journal of Materials Research, volume 10, issue 10, 2000, Pages 671~676
-based ceramics with partially oxidized Ti powders were prepared by sintering at
for 1 h in v vacuum, and then heated in air. In this study, the effect of partially oxidized Ti powders on electrical properties and microstructures of
-based ceramics was investigated. It was found out that the semiconductive
-based ceramics beζame to show excellent PTCR (more than
) characteristic by adding 5~7 vol% of partially oxidized Ti powder. Also, it was found out that the sintered compact had extremely porous and fine-grained microstructure. The relative density and grain size of sintered compact with 5 vol% of partially oxidized Ti powders were 54% and
, respectively. The mechanism for the development of PTCR characteristic in
-based ceramics with partially oxidized Ti powders due to the adsorption of oxygen at grain boundaries, and could be explained, based on Heywang model.
Fabrication of Y-TZP/Ce-TZP Multilayer Composites Using Slip Casting(II)
Kim, Min-Ju ; Lee, Yun-Bok ; Kim, Yeong-U ; Jeon, Byeong-Se ; Park, Hong-Chae ;
Korean Journal of Materials Research, volume 10, issue 10, 2000, Pages 677~683
Three- and five-layer 3Y-YZP/12Ce- TZP composites prepared by a slip casting method have been characterized in terms of mechanical properties. The fracture strength of mutilayer c
nposites determined in a diametral compression test was 327~534 MPa. Although the indentation strength of the materials was generally reduced with i increasing Vickers indentation load up to 300 N, the damage resistance of multilayer composites was superior compared to monolithic layer TZP material. The four-point bend strength of the layered material remained at the values of 620~674 MPa after indentation with a load of 49 N, while that of the monolithic TZP material was 129~339 MPa. The microindentation toughness of the multilayer material was
Effects of PZT-Electrode Interface Layers on Capacitor Properties
Kim, Tae-Ho ; Gu, Jun-Mo ; Min, Hyeong-Seop ; Lee, In-Seop ; Lee, In-Seop ;
Korean Journal of Materials Research, volume 10, issue 10, 2000, Pages 684~690
In order to study effects of interfacial layers between
films and electrodes for Metal-Ferroelectric-MetaI(MFM) structure capacitors, we have fabricated the capacitors with the Pt/PZT/interfacial-layer/Pt/
interfacial layers were formed by sol-gel deposition and PbO, ZrO, and
thin layers were deposited by reactive sputtering.
interface layers result in the finest grains of PZT(crystalline Temp.
) films compare to
layers. However, as the thickness of
layer increases. PZT thin films become rough and electrical characteristics were deteriorated due to remained anatase phase. On the other hand. PT interface layers result in improved morphology of PZT films and do not significantly change ferroelectric properties. It is a also observed that seed layers at the middle and top of PZT films do not give significant effects on grain size but the PT seed layer at the interface between the bottom electrode and the PZT films results in the small grain size.
Thin Film Grown by MOCVD
Kim, Seong-Ik ; Kim, Seok-Bong ; Park, Su-Yeong ; Lee, Seok-Heon ; Lee, Jeong-Hui ; Heo, Jung-Su ;
Korean Journal of Materials Research, volume 10, issue 10, 2000, Pages 691~697
thin layers are promising materials for optical devices in the UV regions.
thin layers w were grown on sapphire substrates by metalorgaruc chemical vapor deposition (MOCVD). The molar Al fraction and crystallinity of layers were deduced from synchrotron x-ray scattering experiment. Surface morphology were investigated using SEM and SPM.
layers crystallinity were related with undoped GaN crystallinity. The Al mole fraction of
layers affect the surface morphology of
layers. The surface morphology was roughe ened and the cracks were obse
ed by increasing the Al mole fractions.
Characteristics of Optical Absorption in
Multi-Quantum Wells by a Surface Photovoltage Method
Kim, Gi-Hong ; Choe, Sang-Su ; Son, Yeong-Ho ; Bae, In-Ho ; Hwang, Do-Won ; Sin, Yeong-Nam ;
Korean Journal of Materials Research, volume 10, issue 10, 2000, Pages 698~702
The characteristics of optical absorption in
multi-quantum wells(MQWs) structure were investigated by using the surface photovoltage(SPV). The Spy features near 1.42 eV showed two overlapping signals. By chemical etching, we found associated with the GaAs substrate and the GaAs cap layer. The Al composition(x=24 %) was determined by Kuech's composition formula. In order to identify the transition energies. the experimentally observed energies were compared with results of the envelope function approximation for a rectangular quantum wells An amplitude variation of the relative Spy intensity from the GaAs substrate, llH, and llL was observed at different light intensities. A variation in the SPY line shape of the transition energies were observed with decreasing temperat ture.
Control of Crowning Using Residual Stress induced by the Difference of Tehermal Expansion Between Ceramic and Carbon Steel in Ceramic Cam Follower
Choe, Yeong-Min ; Lee, Jae-Do ; No, Gwang-Su ;
Korean Journal of Materials Research, volume 10, issue 10, 2000, Pages 703~708
As the engine design changes to get high efficiency and performance of commercial diesel engine, surface w wear of the earn follower becomes an important issue as applied load increasing at the contact face between cam follower and cam. We developed the ceramic cam follower made of sili
n nitride ceramic which was more wear resistant than the cast iron or sintered metal cam follower. Ceramic cam follower was made by direct brazing of thin ceramic disk to steel body using an active brazing alloy without the interlayer. In-situ crowning(R), resulted from the difference of thermal expansion coefficient between ceramic and carbon steel after direct brazing without any stress-relieving inter]ayer, could be controlled. When a earbon steel was heated above
point and then c
led, the expansion curve represented a hysteresis. Appropriate crowning was achieved below the
) and crowning increased with brazing temperature exponentially above the
point. Optimum brazing temperature range was from 700 to
. We developed successfully the ceramic cam follower having appropriate crowning and being inexpensive. Also we could successfully control the crowning of ceramic earn follower by hysteresis behavior of thermal expansion of earbon steel during direct brazing process.
Magnetic Properties of
(x=0, 0.6, 0.9)Amorphous Multilayers
Kim, Sang-Won ;
Korean Journal of Materials Research, volume 10, issue 10, 2000, Pages 709~714
Sheet fabrication of Ni-WC anode for Molten Carbonate Fuel Cell by Tape Casting Method
Choe, Jin-Yeong ; Jeong, Seong-Hoe ; Jang, Geon-Ik ;
Korean Journal of Materials Research, volume 10, issue 10, 2000, Pages 715~720
By the mechanical alloying method. Ni-WC composite materials were prepared to improve the deformation-resistance for creep and sintering of Ni-anode at the operating temperature of
. Mechanically alloyed powder w was initially fabricated by ball milling for 80hr, and then amorphization was occurred by the destruction of ordered crystals based on XRD analysis. In order to investigate the electrochemical performance and sheet characteristics of Ni-WC anode, tape casting process was adopted. Finally, the obtained sheet thickness of Ni- we after sintering at
for 60 minutes in
atmosphere was O.9mm and the average pore size was
with porosities of 55%. The second phase was not observed in Ni- W matrix while W particles were finely and uniformly distributed in Ni matrix. This fine and uniform distributed W particles in Ni matrix are expected to enhance the mechanical properties of Ni anode through the dispersion and solid solution hardening mechanisms.