A5091637664- Advanced materials and composites
- Advanced ceramic materials synthesis
- Metal and Thin Film Mechanics
- Powder Metallurgy Techniques and Materials
- Luminescence Properties of Advanced Materials
- Gas Sensing Nanomaterials and Sensors
- Aluminum Alloys Composites Properties
- Orthopaedic implants and arthroplasty
- Microwave Dielectric Ceramics Synthesis
- ZnO doping and properties
- MXene and MAX Phase Materials
- Intermetallics and Advanced Alloy Properties
- Radiation Detection and Scintillator Technologies
- Ga2O3 and related materials
- Advancements in Battery Materials
- Metallurgical and Alloy Processes
- Nuclear materials and radiation effects
- Boron and Carbon Nanomaterials Research
- Fusion materials and technologies
- Transition Metal Oxide Nanomaterials
- Diamond and Carbon-based Materials Research
- Arsenic contamination and mitigation
- Glass properties and applications
- Injection Molding Process and Properties
- Adsorption and biosorption for pollutant removal
Royal University of Phnom Penh
2023
Seoul National University
2011-2021
Materials Science & Engineering
2001-2018
Government of the Republic of Korea
2015
University of Seoul
2013
Inha University
2013
National Institute for Materials Science
2013
American Ceramic Society
1988-2010
Korea Basic Science Institute
2010
Samsung (South Korea)
2010
The core/rim structures of compounds in the Ti(C,N)‐ x WC‐20Ni system have been investigated to determine effect WC and nitrogen content on microstructure system. In addition, relative dissolution rate Ti(C,N) was studied by analyzing rim compositions. Variations had a much‐lesser influence, as an additive, general than that other carbides used previous studies. However, Ti(C 1− X N ) significant its microstructure. composition structure determined ratio solutes were dissolved liquid binder,...
The formation of vacancies and the structural stability layered lithium nickel oxide (LNO)-based cathode materials are investigated. thermodynamic oxygen their most stable configurations examined by first-principles density functional theory calculations. underlying chemical mechanism is analyzed a molecular orbital method. weaker ionic bonding between Ni O than Co found to be main cause for imperfect structure LNO crystals. On basis these calculations, phase diagrams Li–(Ni,Co)–O system...
LiNiO2 (LNO)-based layered materials for use as cathodes in lithium ion batteries generally take the form of agglomerates composed small particles. Such morphologies produce low electrode densities compared with LiCoO2 (LCO). In this study, surface energies various LNO and LCO crystal facets were calculated, morphological characteristics interpreted based on these results. Crystal models constructed energy each facet was calculated using density functional theory methods. The chemical...
An investigation of the microstructural evolution and dissolution phenomena in a Ti(C 0.7 N 0.3 )– x WC– y NbC–20Ni system is reported. In systems, phase separation occurs between Ti(CN) core (Ti,Nb)(CN) rim phases when contains >15 wt% NbC. This results from increased misfit cores solid‐solution with addition Based on data obtained previous study compositional analyses structure system, average rates WC NbC appear to be approximately same respect that Ti(CN), under given sintering...
An infiltration method for preparing a boron carbide‐aluminum (B 4 C‐AI) composite was modified so as to reduce the processing temperature and time. Titanium metal titanium‐based compounds were added B C powders enhance wettability of liquid aluminum on carbide skeletons. As expected, time required significantly reduced using additives. Of these additives titanium most effective in facilitating infiltration. Another method, involving heat treatment compacts at 1300°3C 1 h before...
The stable phase domains of the TiO<sub>2</sub>–Ti<sub>3</sub>O<sub>5</sub>–Ti<sub>2</sub>O<sub>3</sub>–TiO–Ti(C<sub>x</sub>O<sub>y</sub>)–TiC system were examined experimentally and using first principles calculations.
The evolution of rim structures during the liquid‐phase sintering Ti(C 0.7 N 0.3 )· x WC·20Ni ( = 5–25 wt%) was investigated under a variety conditions and densification procedures. In addition, onset formation surrounding in system examined by analyzing microstructures compositions. compositions inner outer rims were found to vary with temperature holding time. results indicate that forms at thereafter or cooling stage sintering. coalescence Ti(C,N) appears occur great extent before phases.