A5023409842- Nuclear Materials and Properties
- Nuclear reactor physics and engineering
- Advanced ceramic materials synthesis
- Molten salt chemistry and electrochemical processes
- Ferroelectric and Piezoelectric Materials
- Radioactive element chemistry and processing
- Microwave Dielectric Ceramics Synthesis
- Nuclear materials and radiation effects
- Extraction and Separation Processes
- Adsorption and biosorption for pollutant removal
- Recycling and utilization of industrial and municipal waste in materials production
- Electronic and Structural Properties of Oxides
- Metallurgical Processes and Thermodynamics
- Dielectric materials and actuators
- Bone Tissue Engineering Materials
- Industrial Gas Emission Control
- Concrete and Cement Materials Research
- Advanced materials and composites
- Aluminum Alloys Composites Properties
- Catalytic Processes in Materials Science
- Advancements in Battery Materials
- Mesoporous Materials and Catalysis
- Aerogels and thermal insulation
- Anodic Oxide Films and Nanostructures
- Iron and Steelmaking Processes
Changwon National University
2020-2025
Korea Atomic Energy Research Institute
2014-2019
Korea Advanced Institute of Science and Technology
2011-2014
The mechanism of core/shell formation during sintering in B a T i O 3 ‐based systems was studied ( M g, Y )‐doped . effect ball milling time on core size and shell thickness first observed. similar irrespective whereas the increased with increasing time. measured powder after suggested that cores were from larger particles shells formed via dissolution smaller precipitation dissolved material, contrast interpretation results previous investigation. To identify mechanism, bi‐layer samples...
Abstract To realize direct reduction by hydrogen in iron and steel making industry, resistance of refractory bricks should be sufficient. However, the effects on have not been studied intensively. In this study, physical chemical changes mullite‐based were investigated for use a atmosphere. After exposure to at 1100°C 72 h, mechanical strength was reduced up ∼ 15%, with change color. Multi‐aspect analysis indicated possible causes: SiO 2 , that is, SiO(g) formation, degradation, Fe O 3...
Two sets of (Mg,Y)-doped BaTiO3 samples were prepared to investigate the effects core/shell volumetric ratio on dielectric-temperature behavior BaTiO3: one set with same grain size but different core sizes and other shell thicknesses. The microstructural variation was characterized their dielectric properties measured. For both samples, temperature stability generally improved a reduction regardless sizes. There existed, however, limit reduction; for studied range, thickness third radius...
Abstract Sintering phenomena, densification, and grain growth are crucial for proper control of the microstructure good mechanical strength. Here, materials processing parameters, addition La 2 O 3 , two‐step sintering (TSS) were combined to lead higher strength in porous alumina prepared by freeze‐casting. Based on densification behaviors with doping, a beneficial thermal profile was designed TSS. As result, relative density levels smaller size obtained compared results conventional (CS):...
Silicon oxycarbide, as confirmed by in situ TEM, exhibits near-zero volume expansion strain during lithiation, resulting reduced electrolyte uptake.
Core/shell-grained BaTiO3 samples were prepared with addition of rare earth elements. The core/shell interface was semi-coherent, and many misfit dislocations formed in Dy-doped samples. In contrast, a coherent few observed Ho- Er-doped exhibited poor temperature stability, showing peak no frequency dispersion. broad curve This improved stability is attributed to the coherency strain, which leads formation polar nano-regions shell. Coherency at critical improve core/shell-structured BaTiO3.
In the pyroprocess integrated inactive demonstration (PRIDE) facility at Korea Atomic Energy Research Institute (KAERI), UO 2 porous pellets were fabricated as a feed material for electrolytic reduction on an engineering scale of 30 kg-U/batch. To increase batch size, we designed and modified corresponding equipment unit processes based ceramic processing. course pellet fabrication, correlation between green density sintered was investigated within compaction pressure range 106–206 MPa, in...
Mechanical stability of freeze-casted porous alumina can be achieved by the stimulation densification with control grain growth during sintering. To tailor microstructure beneficially, in this study TiO2 was added and its segregation effect on behaviors were investigated. As a result, abnormal observed faceted interfaces explained boundary structure dependent theory. In terms densification, higher bulk density obtained addition 1.5 wt% (41.76 %TD) compared to that without doping (36.02 %TD)....
Abstract To increase mechanical strength of porous ceramics, here, an effective two‐step sintering (TSS) technique capable producing highly alumina with enhanced is suggested. Based on the theories, a significantly lower activation energy for densification at low temperature region allowed beneficial range TSS to be deduced. With specific regime ( T 1 = 1550°C and 2 1400°C), higher compressive levels (8.00–15.24 MPa) were measured apparent porosity 56.49% compared conventional (1.03–1.86...