• Proceedings of the Korean Ceranic Society Conference
• /
• 2004.04b
• /
• pp.27.1-27.1
• /
• 2004

• Journal of the Korean Ceramic Society
• /
• v.40 no.7
• /
• pp.667-671
• /
• 2003

Tape cast laminar composites with alumina/zircon(reaction-bonded mullite/zirconia) as an inner layer and alumina/zirconia or mullite/zirconia as an outer layer have been fabricated by hot-pressing. The mechanical properties(hardness and Young's modulus) and microstructure of laminar composites were examined using a nanoindentation technique and Scanning Electron Microscopy (SEM), respectively. The indentation load-displacement curve revealed the existence of residual stress in laminar composites.

• Ceramist
• /
• v.6 no.3
• /
• pp.42-55
• /
• 2003

• Ceramist
• /
• v.5 no.6
• /
• pp.26-32
• /
• 2002

• Proceedings of the Korean Ceranic Society Conference
• /
• 2000.04a
• /
• pp.31.1-31.1
• /
• 2000

• Proceedings of the Korean Ceranic Society Conference
• /
• 2003.10a
• /
• pp.123.2-123
• /
• 2003

• Ceramist
• /
• v.20 no.2
• /
• pp.25-33
• /
• 2017

• Journal of the Korean Ceramic Society
• /
• v.42 no.4
• /
• pp.292-297
• /
• 2005

$LiMO_{2}(M=Co,Ni)$ samples were synthesized with $Li_{2}CO_{3},\;Co_{3}O_{4}$, and NiO by the solid-state reaction method. In the case of $LiCoO_{2}$, at low temperature$(T=400^{\circ}C)$ spinel structure was synthesized and the obtained spinel phase was transformed to layered phase at high temperature$(T\ge600^{\circ}C)$. The phase transition behaviors of $LiCoO_{2}$ were investigated with various heating temperature and time. The rate of transition was directly proportional to the concentrations of reactant, and activation energy of reaction was around 6.76 kcal/mol. When CoO(rock salt structure) was used as a starting material instead of $Co_{3}O_{4}$(spinel structure), layered structure of $LiCoO_{2}$ was obtained at low temperature. In the case of $LiNiO_{2}$ the transition from layered structure to rock salt structure occurred easily by disordering/ordering reaction, but did not occur in $LiCoO_{2}$. The difference in metal ion radii in $LiCoO_{2}$ and $LiNiO_{2}$ results in different behaviors of phase transitions.

• Proceedings of the Korean Ceranic Society Conference
• /
• 2003.10a
• /
• pp.138.2-138
• /
• 2003

• Journal of the Korean Ceramic Society
• /
• v.41 no.1
• /
• pp.41-44
• /
• 2004

Hydrophilicity and hydrophobicity of pottery bodies can be controlled via chemical substitution of layered clay with hydrophilic and hydrophobic organics. In this study, organo-clay nanocomposites were prepared by ion-exchange of montmorillonite with dodecylamine and hexadecylamine, respectively. Substitution sites of organics and the interval changes of layered materials are characterized by FT-IR and WAXD and organics amounts loaded and water comtents contained by C/S analysis and TG-DSC. The organics were selectively intercalated so that increase layer interval from 12${\AA}\; to\;16{\AA}$. Organo-modified clay is changed to more hydrophobic comparing to clay itself.