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Deep Learning-Enhanced Wear Analysis of Fe-Cr Composite Coatings for Automotive Brake Applications under Euro 7 Requirements
Tae-Jun Park, Gye-Won Lee, Jong-Il Kim, Sahn Nahm, Yoon-Suk Oh
Korean J. Met. Mater. 2025;63(12):997-1011.   Published online 2025 Dec 5
DOI: https://doi.org/10.3365/KJMM.2025.63.12.997

Abstract
The increasing transition to electric vehicles and new Euro 7 standards has intensified the focus on brake-derived particulate emissions. Current braking systems exhibit significant susceptibility to corrosion with an accelerated wear rate. This susceptibility highlights the need for materials that can maintain stable friction coefficients under various operating conditions. Therefore,..... More

                
Metal-Organic Framework-derived Au-ZnO Nanostructures for Ultrasensitive and Selective H2S Gas Detection
Donghyeon Kim, Jimyeong Park, Jiyeon Shin, Sunghun Hong, Minseo Kim, Chulwoong Han, Sung Cheol Park, Jae-Hyoung Lee, Myung Sik Choi
Korean J. Met. Mater. 2025;63(12):986-996.   Published online 2025 Dec 5
DOI: https://doi.org/10.3365/KJMM.2025.63.12.986

Abstract
Au-ZnO nanostructures derived from zeolitic imidazolate framework-8 (ZIF-8) were rationally designed and investigated as highly efficient chemiresistive sensors for detecting H2S gas. The incorporation of Au nanoparticles markedly enhanced the sensing characteristics relative to pristine ZnO, delivering an extraordinary response of ~419.1 toward 10 ppm H2S at 200 °C—nearly two..... More

                
Hierarchical NiFe-LDH on Conductive Ni3Se2 Scaffolds for Efficient Oxygen Evolution Reaction
Tae Kwang An, Yun Seok Jang, Dong Hyun You, Soon-Yong Kweon, Jeong Ho Ryu
Korean J. Met. Mater. 2025;63(12):976-985.   Published online 2025 Dec 5
DOI: https://doi.org/10.3365/KJMM.2025.63.12.976

Abstract
Abstract Developing earth-abundant oxygen-evolution reaction (OER) electrodes that operate efficiently at practical current densities remains a challenge because NiFe layered double hydroxides (LDHs), which are among the most active non-noble catalysts in alkaline media, are limited by poor electronic conductivity, nanosheet restacking, and weak contact with current collectors. Herein, we..... More

                
Thermal Properties and Durability of a Rare-Earth-Doped YSZ Bilayer Coating System
GyeWon Lee, YongSeok Choi, HakBeom Jeon, JongIl Kim, ChangWoo Lee, JangHyeok Pyeon, SeungCheol Yang, InHwan Lee, YoonSuk Oh
Korean J. Met. Mater. 2025;63(10):853-862.   Published online 2025 Oct 5
DOI: https://doi.org/10.3365/KJMM.2025.63.10.853

Abstract
To protect gas turbine hot section components from operating temperatures exceeding 1100 ℃, thermal barrier coating systems are used. Although yttria-stabilized zirconia (YSZ) is commercially used as a thermal barrier coating material, it is destabilized by phase transformations when exposed to extremely high-temperature operating environments (>1200 ℃). In efforts to..... More

                
Curing Behavior and Stacking Stability of Photocurable Si3N4 Slurries for DLP 3D Printing
Min-Ho Lee, Jae-Seung Lee, Jong-Pil Ahn, Sung Min So, Jin-Woo Kim, Tack-yoon Kim, Joo-Seok Park, Heesoo Lee
Korean J. Met. Mater. 2025;63(10):839-852.   Published online 2025 Oct 5
DOI: https://doi.org/10.3365/KJMM.2025.63.10.839

Abstract
Digital light processing (DLP) 3D printing has emerged as a promising technique for fabricating highprecision ceramic components, including biomedical implants. However, achieving high-strength silicon nitride (Si3N4) spinal implants via DLP remains challenging due to slurry formulation constraints. This study optimizes the formulation of a photocurable Si3N4 slurry to enable DLP-based..... More

                
Red Phosphorus Hybridized with Silicon Nanoparticles Encapsulated in Nitrogen-Doped Carbon Nanotubes Composite for Lithium-ion Secondary Batteries
Md Rasidul Islam Rocky, Venugopal Nulu, Keun Yong Sohn
Korean J. Met. Mater. 2025;63(10):828-838.   Published online 2025 Oct 5
DOI: https://doi.org/10.3365/KJMM.2025.63.10.828

Abstract
Lithium-ion batteries (LIBs) are valued for their lightweight nature, long cycle life, and high energy density, which make them ideal for use in electric vehicles and portable electronics. Recently, red phosphorus (P) has been identified as a potential anode material with a theoretical specific capacity of 2,596 mAh g-1. However,..... More

                
Pulsed UV-Assisted Annealing for Low-Temperature Processing of In2O3 Thin Films for TFT Applications
Xue Zhang, Hyeonju Lee, Bokyung Kim, Taehui Kim, Dongwook Kim, Youngjun Yun, Eui-Jik Kim, Jaehoon Park
Korean J. Met. Mater. 2025;63(10):812-819.   Published online 2025 Oct 5
DOI: https://doi.org/10.3365/KJMM.2025.63.10.812

Abstract
In this study, we explore the potential of pulsed ultraviolet (UV)-assisted thermal annealing as an effective low-temperature processing technique for fabricating high-performance indium oxide (In2O3) thin films, with a particular emphasis on their application in thin-film transistors (TFTs). In2O3 films were synthesized using a solution-based method, with indium nitrate hydrate..... More

                
High-Temperature, Time-Dependent Deformation and Densification of Unique Multi-Sheet Stacked Ni-Cr-Al Superalloy Foam
Kyu-Sik Kim, Tae-Hoon Kang, Man-Ho Park, Jung-Yeul Yun, Kee-Ahn Lee
Korean J. Met. Mater. 2025;63(10):779-787.   Published online 2025 Oct 5
DOI: https://doi.org/10.3365/KJMM.2025.63.10.779

Abstract
This study investigates the fabrication and high-temperature time-dependent deformation of a multi-sheet stacked Ni-Cr-Al superalloy foam. The foam was produced by powder spraying to deposit alloying elements onto a pure Ni preform, followed by transient liquid phase sintering for homogenization and hot rolling for lamination and structural integrity. The fabricated..... More

                
Growth and Controlled Si Doping in Homoepitaxial β-Ga2O3 Films by Plasma-Assisted Molecular Beam Epitaxy
Nguyen Quoc Vuong, Trong Si Ngo, Raouf Hayyak, Taswar Iqbal, Ji-Hyeon Park, Dae-Woo Jeon, Soon-Ku Hong
Korean J. Met. Mater. 2025;63(9):711-717.   Published online 2025 Sep 5
DOI: https://doi.org/10.3365/KJMM.2025.63.9.711

Abstract
The growth evolution of undoped and Si-doped β-Ga2O3 films prepared using plasma-assisted molecular beam epitaxy was investigated. The effect of Si effusion cell temperatures on surface morphology and the electrical properties of the homoepitaxial (010) β-Ga2O3 films was systematically investigated. Using a solid source of Si as an n-type dopant..... More

                
Morphological Control of Cu2O Particles via NaCl Addition and their Antibacterial Activity
Taejong Jang, Siwoo Lee, Yangdo Kim, Young Bok Ryu
Korean J. Met. Mater. 2025;63(8):643-650.   Published online 2025 Aug 5
DOI: https://doi.org/10.3365/KJMM.2025.63.8.643

Abstract
Cuprous oxide (Cu2O) particles have attracted significant attention due to their low cost, non-toxicity, and abundance with applications spanning solar energy conversion, photocatalysis, sensing, and antimicrobial fields. The antibacterial activity of Cu2O particles is strongly influenced by their morphology, which determines the exposure of specific crystal facets with distinct surface..... More

                
Impact of Microwave Irradiation on the NO2 Gas Sensing Properties of ZnO Nanoparticles
Jimyeong Park, Jeong Yun Hwang, Jiyeon Shin, Ali Mirzaei, Jong Wook Roh, Qingsong Wang, Sun-Woo Choi, Changhyun Jin, Myung Sik Choi
Korean J. Met. Mater. 2025;63(8):594-605.   Published online 2025 Aug 5
DOI: https://doi.org/10.3365/KJMM.2025.63.8.594

Abstract
This study explores the influence of microwave (MW) irradiation time on the NO2 gas sensing performance of ZnO nanoparticles (NPs). ZnO NPs were subjected to MW irradiation for 1, 3, 5, and 7 minutes to assess the effects of defect engineering via MW irradiation on their sensing behavior. Phase and..... More

                
Measurement of Gas Transport Properties for H2, He and N2 in Gas Enriched-LDPE, HDPE and NBR Polymers with Volumetric Semi-Cylindrical and Coaxial-Cylindrical Capacitive Electrodes Sensors
Gyung Hyun Kim, Young Il Moon, Jae Kap Jung
Korean J. Met. Mater. 2025;63(7):515-530.   Published online 2025 Jul 1
DOI: https://doi.org/10.3365/KJMM.2025.63.7.515

Abstract
In this study, a high-performance gas sensing system is developed by integrating capacitive electrode-based sensing with volumetric analysis to quantitatively evaluate gas uptake and diffusivity from gas-enriched polymer specimens. The sensor system comprises two types of capacitive electrode configurations: (1) a dual semi-cylindrical electrode pair affixed to the outer surface..... More

                
Development of Volumetric and Manometric Techniques for Measuring Gas Emission Concentration and Diffusivity in Gas Enriched Polymers
Ji Hun Lee, Sang Koo Jeon
Korean J. Met. Mater. 2025;63(6):437-452.   Published online 2025 Jun 5
DOI: https://doi.org/10.3365/KJMM.2025.63.6.437

Abstract
Gas sensors are crucial devices in various fields such as industrial safety, environmental monitoring, gas infrastructure including hydrogen use, and medical diagnostics. These sensors precisely measure the presence of gases on-site in different environments to ensure operational safety and efficiency. Designed for high sensitivity, stability, and reliability, gas sensors are..... More

                
Effect of Process Parameters on Interfacial Reaction and Mechanical Properties of AlSi10Mg and Inconel 625 Joints during Laser Direct Energy Deposition
Chanho Park, Minsu Park, Haeju Jo, Wookjin Lee
Korean J. Met. Mater. 2025;63(6):410-420.   Published online 2025 Jun 5
DOI: https://doi.org/10.3365/KJMM.2025.63.6.410

Abstract
The joining of Ni/Al dissimilar metals to exploit the synergetic effect between the unique properties of Ni and Al alloys has been studied for potential applications in various industrial areas. This study investigates the interfacial reaction between deposited AlSi10Mg and an Inconel 625 substrate during the laser direct energy deposition..... More

                
Experimental Evaluation of Unidirectional Pulsating Traveling Magnetic Field Effectiveness for High-Strength 7xxx-Series Aluminum Alloy Slab Semi-Continuous Casting
Mykola Slazhniev, Sung Gyu Choi, John Ok Shin, Kyung Hyun Kim, Hyun Suk Sim
Korean J. Met. Mater. 2025;63(4):271-280.   Published online 2025 Apr 5
DOI: https://doi.org/10.3365/KJMM.2025.63.4.271

Abstract
This study investigates the application of a unidirectional pulsating traveling magnetic field (UPTMF) for the semi-continuous casting of high-strength aluminum alloy 7075 slabs (350×150 mm). The experimental setup involved a comparative analysis of direct chill (DC) casting and electromagnetic stirring (EMS) with a 5 Hz amplitude modulated U-PTMF and 22.5..... More

                
Preprocessing of Inconsistent Creep Data Collected from a Literature Survey to Provide Reliable and Consistent Creep Life Prediction
Taejoo Lee, Chang-Seok Oh, Yoon Suk Choi
Korean J. Met. Mater. 2025;63(3):231-241.   Published online 2025 Mar 5
DOI: https://doi.org/10.3365/KJMM.2025.63.3.231

Abstract
Numerous studies on machine learning-based creep life prediction using the creep data collected from various existing experimental data have been reported. Since the prediction of creep life is heavily influenced by the quality and integrity of the collected creep data, data preprocessing is required to eliminate physically inconsistent creep datapoints,..... More

                
Preparation and Characterization of Eye Medical Hydrogel Lens Polymers Containing Tretinoin
Hye-In Park, A-Young Sung
Korean J. Met. Mater. 2025;63(3):217-223.   Published online 2025 Mar 5
DOI: https://doi.org/10.3365/KJMM.2025.63.3.217

Abstract
This study analyzed the physical properties of hydrogel lens prepared by photopolymerization and thermal polymerization using tretinoin (ATRA) as an additive to improve functionality, such as alleviating dry eyes and to impart antibacterial properties. In addition, we wanted to confirm the applicability of the ophthalmic material as a drug delivery..... More

                
Electrical Characteristics of Time-Dependent Flexible Organic Ferroelectric Field-Effect Transistors
Hyeonju Lee, Chintalapalli Jyothi, Dongwook Kim, Youngjun Yun, Jaehoon Park
Korean J. Met. Mater. 2025;63(3):203-209.   Published online 2025 Mar 5
DOI: https://doi.org/10.3365/KJMM.2025.63.3.203

Abstract
Organic ferroelectric field-effect transistors (Fe-FETs) are highly attractive for memory device applications because of their ability to read data without causing damage (nondestructive readout) and their excellent retention capabilities. These attributes make organic Fe-FETs an appealing alternative to their inorganic counterparts, which, while demonstrating superior memory performance for practical applications,..... More

                
Strengthening of Austenitic Steel 316 Alloy by Incorporating ZrO2 Particles via Mechanical Alloying and Vacuum Hot-Pressing
K. Raja Rao, Hansung Lee, Man Mohan, Sheetal Kumar Dewangan, Cheenepalli Nagarjuna, Kwan Lee, Sudip Kumar Sinha, Byungmin Ahn
Korean J. Met. Mater. 2025;63(3):186-196.   Published online 2025 Mar 5
DOI: https://doi.org/10.3365/KJMM.2025.63.3.186

Abstract
This study examines the influence of ZrO2 on austenitic stainless steel 316 (ASS 316). Following the addition of varying weight percentages (0, 1, 2, and 3) of ZrO2 to ASS 316 powder, the samples were ball-milled for a duration of 30 h and then subjected to vacuum hot-pressing (VHP) for..... More

                
Facile Electrode Manufacturing Strategy for Ultra-Low Cobalt Consumption in Oxygen Evolution Reaction
Hee Yoon Roh, Ki-Yong Yoon, Jaehoon Jeong, Kyung-Bok Lee, Dohyung Kim, Yangdo Kim, Juchan Yang
Korean J. Met. Mater. 2025;63(2):168-176.   Published online 2025 Feb 5
DOI: https://doi.org/10.3365/KJMM.2025.63.2.168

Abstract
Water splitting is a sustainable method of hydrogen production that is crucial for achieving carbon neutrality. However, the high cost of green hydrogen remains a major challenge. One strategy to reduce costs is the use of non-precious metal catalysts, such as Co, which is known for its excellent catalytic properties...... More

                
Enhancement of High-Temperature Thermoelectric Properties in Pd-decorated Bi-Sb-Te System
Hyunjin Park, Seunghyun Chun, Junsu Kim, Young-Woo Kim, Changwoo Lee, Won-Seon Seo, Sang-il Kim, Hyosun Lee, Hyun-Sik Kim
Korean J. Met. Mater. 2025;63(1):43-52.   Published online 2025 Jan 5
DOI: https://doi.org/10.3365/KJMM.2025.63.1.43

Abstract
Bismuth antimony telluride (Bi-Sb-Te)-based alloys remain the dominant choice for near-roomtemperature thermoelectric cooling applications. One of the most studied approaches to improve the thermoelectric performance of Bi-Sb-Te alloys has been a nanostructuring strategy, to suppress the lattice thermal conductivity. This study investigates the impact of incorporating reduced pyrolyzed Pd acetate..... More

                   Web of Science 1
Microstructure and Tensile Behaviors of Laser-Arc Hybrid Welds Comparing to Submerged Arc Welds of High-Manganese Steel for Cryogenic Applications
Myeonghwan Choi, Kwang-Hyeon Lee, Dae-Won Cho, Namhyun Kang
Korean J. Met. Mater. 2025;63(1):33-42.   Published online 2025 Jan 5
DOI: https://doi.org/10.3365/KJMM.2025.63.1.33

Abstract
The weldability and the relationship between microstructure and tensile properties at 298 and 110 K produced by laser-arc hybrid welding (LAHW) in high-Mn steel welds were thoroughly investigated. In the laser zone of LAHWs using filler wire, more Mn vaporization in the laser zone was observed than at the arc..... More

                
Surface Defect Generation on SnO2 Nanoparticles Using High-Energy Ball Milling for H2S Gas Sensor Applications
Changyu Kim, Sung Wook Ye, Jiyeon Shin, Jimyeong Park, Se Hun Lee, Jeung-Soo Huh, Ali Mirzaei, Jong Wook Roh, Myung Sik Choi
Korean J. Met. Mater. 2024;62(12):963-971.   Published online 2024 Nov 29
DOI: https://doi.org/10.3365/KJMM.2024.62.12.963

Abstract
Hydrogen sulfide (H2S) is a highly toxic and dangerous gas with a flammable and corrosive nature, making the development of reliable gas sensors for its detection vital. This study investigated the enhancement in H2S gas sensing performance of commercial SnO2 powders after high-energy milling. SnO2 powders were subjected to high-energy..... More

                
Facile Synthesis and Thermal Stability Enhancement of Sulfurized Polyacrylonitrile for Thermal Battery Cathodes
Dohun Kim, Wonjun Ahn, Jae-Seong Yeo, Yusong Choi, Sangbaek Park
Korean J. Met. Mater. 2024;62(11):879-885.   Published online 2024 Nov 5
DOI: https://doi.org/10.3365/KJMM.2024.62.11.879

Abstract
Although sulfide-polyacrylonitrile (SPAN) is considered a promising cathode material for various battery applications, their application in thermal batteries has not yet been explored. Herein we synthesized carbonized SPAN (c-SPAN) to enhance the thermal stability of SPAN and evaluated its application as a cathode for thermal batteries. The efficiency of c-SPAN..... More

                   Web of Science 1  Crossref 1
Enhanced Electromagnetic Wave Absorption in Hexaferrite/LSMO Bilayers: Optimization of Structural Design Using a High Frequency Software Simulation
Jae-Hee Heo, Tae-Woo Lee, Young-Min Kang, Sang-Min Lee
Korean J. Met. Mater. 2024;62(11):868-878.   Published online 2024 Nov 5
DOI: https://doi.org/10.3365/KJMM.2024.62.11.868

Abstract
In this study, the electromagnetic (EM) wave absorption properties of a two-layered structure composed of La0.7Sr0.3MnO3-epoxy (10 wt.%) (LSMO) and SrFe9.5Co1.25Ti1.25O19-epoxy (10 wt.%) (SFCTO), both exhibiting distinct high-frequency magnetic and dielectric properties, were investigated using a High Frequency Simulation Software (HFSS) simulation tool. LSMO had a high dielectric constant (ε'..... More

                
Corrosion Behavior of SLMed Ti6Al4V-Equine Bone Nanocomposites
Se Hee Kim, Se Eun Shin
Korean J. Met. Mater. 2024;62(11):837-843.   Published online 2024 Nov 5
DOI: https://doi.org/10.3365/KJMM.2024.62.11.837

Abstract
Ti6Al4V is one of the most widely used Ti alloys in biomedical applications, such as orthopedic and dental implants, due to its excellent mechanical properties, biocompatibility, and high corrosion resistance. Metal implants require high bonding strength between the implant and bone for long-term use in the human body; Hydroxyapatite (HAp)..... More

                
Visible Light-driven Effective Photocatalytic Degradation of the Persistent Organic Pollutant Using Cobalt-doped Strontium Titanate
Shanmugam Mahalingam, Abinaya Srinivasan, Senthil Bakthavatchalam, Chandramohan Govindasamy, Karnan Ramachandiran, Sathish Kumar Paneerselvam, Junghwan Kim
Korean J. Met. Mater. 2024;62(10):803-819.   Published online 2024 Oct 5
DOI: https://doi.org/10.3365/KJMM.2024.62.10.803

Abstract
Residual antibiotics in natural aquatic environments pose a critical threat to humans and other organisms. However, most sewage treatment plants fail to remove them. Photocatalytic nanomaterials can efficiently destroy these persistent organic pollutants in wastewater. In this study, we developed a series of cobalt-doped SrTiO3 (Co-STO) catalysts with different doping..... More

                Supplementary       Web of Science 1
Changes in Microstructure, Mechanical Properties, and Electrical Conductivity of Severely Drawn AA1070 Wire with Annealing
Sang-Hyeon Jo, Seong-Hee Lee
Korean J. Met. Mater. 2024;62(10):749-756.   Published online 2024 Oct 5
DOI: https://doi.org/10.3365/KJMM.2024.62.10.749

Abstract
The drawing process severely deforms commercial AA1070 alloy for electrical wire, reducing a rod from a diameter of 2.0 mm to 0.4 mm, followed by annealing. The annealing process was conducted at various temperatures ranging from 200℃ to 450℃, with each temperature maintained for 1hour. The effects of increasing annealing..... More

                   Web of Science 1  Crossref 1
Effect of Al2O3 Content and Particle Size of Iron Ore on the Assimilation Characteristics of Sintered Ore
Jun Gi Seo, Jae Min Song, Do Yeon Lee, Tae Jun Park, Han Jung Kwon
Korean J. Met. Mater. 2024;62(9):696-704.   Published online 2024 Sep 5
DOI: https://doi.org/10.3365/KJMM.2024.62.9.696

Abstract
This study aims to comprehensively understand the effects of changes in the chemical composition and size of attached particles on the resulting assimilation characteristics during the sintered ore production process. By evaluating the penetration depth and changes in the chemical composition in the assimilated region of the iron ore and..... More

                   Web of Science 1  Crossref 1
Synthesis of Mesoporous CuOx Using Inverse Micelle Sol–gel Process for NO2 Gas Sensing
Sung Gue Heo, Sangwoo Kim, Seok-Jun Seo, Jae Jin Sim, Jiyeon Shin, Ali Mirzaei, Myung Sik Choi
Korean J. Met. Mater. 2000;62(8):631-638.   Published online 2024 Jul 31
DOI: https://doi.org/10.3365/KJMM.2024.62.8.631

Abstract
Nitrogen dioxide (NO2) is a highly dangerous gas, mostly emitting emitted from fossil fuels, and a major contributor to air pollution. It has negatively effects affects on the human health as well asand contributes to environmental issues like acid rain. In this study, mesoporous CuOx nanoparticles (NPs) were successfully synthesized..... More

                   Web of Science 2  Crossref 2
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