Jae‐Woong Ko
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View article: Single Cu Atom Sites on Co3O4 Activate Interfacial Oxygen for Enhanced Reactivity and Selective Gas Sensing at Low Temperature
Single Cu Atom Sites on Co3O4 Activate Interfacial Oxygen for Enhanced Reactivity and Selective Gas Sensing at Low Temperature Open
Controlling the redox landscape of transition metal oxides is central to advancing their reactivity for heterogeneous catalysis or high-performance gas sensing. Here we report single Cu atom sites (1.42 wt%) anchored on Co3O4 nanoparticles…
View article: Application of Magnetic-Assisted Polishing Using Metal-Bonded Grinding Wheels for Machining Silicon Nitride Ball Bearings
Application of Magnetic-Assisted Polishing Using Metal-Bonded Grinding Wheels for Machining Silicon Nitride Ball Bearings Open
Silicon nitride (Si3N4) is used for high-speed rotating bearings in machine tools, aircraft, and turbo pumps due to its excellent material properties such as high-temperature strength, hardness, and fracture toughness. Grinding with fixed …
View article: Optimization of a TEOS addition on plasma resistance of YAG ceramics
Optimization of a TEOS addition on plasma resistance of YAG ceramics Open
The influence of tetraethyl orthosilicate (TEOS) on the plasma etching behavior of yttrium aluminum garnet (Y 3 Al 5 O 12 , yttrium aluminum garnet [YAG]) was systematically studied. Dense YAG bulk specimens were hot‐press sintered at a re…
View article: Experimental Study on ELID Grinding of Silicon Nitride Ceramics for G5 Class Bearing Balls
Experimental Study on ELID Grinding of Silicon Nitride Ceramics for G5 Class Bearing Balls Open
This study has focused on analyzing the impact of material characteristics and grinding conditions on the surface roughness in ELID grinding of ceramic materials intended for bearing balls. The main research objective was to examine the fe…
View article: Review on the thermal characteristics and applications of silicon nitride ceramics
Review on the thermal characteristics and applications of silicon nitride ceramics Open
As the heat generation problem is predicted to intensify due to the trend of integration and high density of the power semiconductor power module responsible for the electric drive of the electric vehicle, which has recently been in full s…
View article: Influence of starting Y2O3 and Nd2O3 powders characteristics on optical properties of highly transparent Nd:Y2O3 ceramics
Influence of starting Y2O3 and Nd2O3 powders characteristics on optical properties of highly transparent Nd:Y2O3 ceramics Open
The present paper systematically investigated the correlation of the starting powder characteristics and optical properties of neodymium doped transparent Y2O3(Nd:Y2O3) ceramics by hot pressing without a subsequent hot isostatic pressing (…
View article: Metallic Silicon Powder Produced by Vacuum Decomposition of Magnesium Silicide Prepared by Magnesiothermic Reduction
Metallic Silicon Powder Produced by Vacuum Decomposition of Magnesium Silicide Prepared by Magnesiothermic Reduction Open
Metallic silicon powder has been widely used for the production of various industrial materials and parts such as refractory ceramics, solar cells, military parts and so on. Herein, we attempted to prepare pure silicon powder from SiO2 by …
View article: Development History and State-of-the-art of Laser Ceramics
Development History and State-of-the-art of Laser Ceramics Open
The most valuable application of transparent ceramics is the laser crystal for the solid-state laser.Especially, since a large-area laser crystal cannot be realized by the single crystal due to the inhomogeneous segregation of laser genera…
View article: The effect of the starting Si powder on the sinterability and thermo-mechanical properties of sintered reaction-bonded silicon nitride
The effect of the starting Si powder on the sinterability and thermo-mechanical properties of sintered reaction-bonded silicon nitride Open
The effects of the size of Si powder on the thermal conductivity and strength of sintered reaction-bonded silicon nitride (SRBSN) were investigated. Si powders with various sizes were prepared by controlling the high-energy milling duratio…
View article: Microstructure and Thermal Conductivity of Sintered Reaction‐Bonded Silicon Nitride: The Particle Size Effects of MgO Additive
Microstructure and Thermal Conductivity of Sintered Reaction‐Bonded Silicon Nitride: The Particle Size Effects of MgO Additive Open
The particle size effect of MgO as a sintering additive on the thermal conductivity of sintered reaction‐bonded silicon nitride (SRBSN) was investigated. It was revealed that the size of MgO is critical for thermal conductivity with regard…
View article: Microstructure and Mechanical Properties of β-SiAlON Ceramics Fabricated Using Self-Propagating High-Temperature Synthesized β-SiAlON Powder
Microstructure and Mechanical Properties of β-SiAlON Ceramics Fabricated Using Self-Propagating High-Temperature Synthesized β-SiAlON Powder Open
β-SiAlON, based on its high fracture toughness, good strength and low abrasion resistance, has been adopted in several industrial fields such as bearings, turbine blades and non-ferrous metal refractories. In general, β-SiAlON is fabricate…
View article: Sinterability of Low-Cost 3Y-ZrO2 Powder and Mechanical Properties of the Sintered Body
Sinterability of Low-Cost 3Y-ZrO2 Powder and Mechanical Properties of the Sintered Body Open
This study investigated the effects of grain size and phase constitution on the mechanical properties of 3Y-ZrO2 by varying the sintering conditions. The raw powder prepared by a low-cost wet milling using the coarse solid oxide powders wa…
View article: The catalytic role of additive components for the nitridation of silicon/additive mixture
The catalytic role of additive components for the nitridation of silicon/additive mixture Open
The nitriding behavior of silicon/additives mixture with varied composition was investigated by focusing on the catalytic effect of sintering additives (Y2O3 and Al2O3) and diluents (Si3N4). While sintering additives have originally been m…