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Characterization of Transparent Electrodes with Ag Metal-mesh using MATLAB
MATLAB을 이용한 Ag Metal-mesh 기반의 투명 전극 특성 분석
Seung-Taek Jo, Jin Wook Shin, Walter Commerell, Dae-Hwang Yoo, Hyesun Yoo, Jinyoung Hwang, Hyun-Sik Kim, Sang-il Kim, Jong Wook Roh
조승택, 신진욱, Walter Commerell, 유대황, 류혜선, 황진영, 김현식, 김상일, 노종욱
Korean J. Met. Mater. 2024;62(6):464-471.   Published online 2024 May 31
DOI: https://doi.org/10.3365/KJMM.2024.62.6.464

It is well-known that optical transparence and electric resistance have a trade-off relationship in transparent electrodes. For this reason, developing methods to predict this relation have been important in various fields of academic research as well as for industrial applications. Herein, we suggest a simple method which reveals the relationship..... More

Polymer-Chain Aggregation-induced Electrical Gating at the H- and J-aggregate P3HT
Byoungnam Park
Korean J. Met. Mater. 2024;62(6):455-463.   Published online 2024 May 31
DOI: https://doi.org/10.3365/KJMM.2024.62.6.455

This research explores how aggregation influences the electrical behavior at both the planar - heterojunction poly(3-hexylthiophene) (P3HT)/SiO2 and P3HT/ZnO nanocrystal (NC) interfaces. The formation of H- and J-type aggregates leads to distinct molecular ordering and packing structures, manifesting as changes in threshold voltage shifts (electrical gating) as well as absorption..... More

Enhancement of Flexural Strength by Slip Casting Cordierite Ceramics with h-BN Nanoparticles
Chul Oh Park, Jong Hyun Lee, Dong Kyun Lee, Hyun Jun Cho, Sung Hwan Yim, Kyu Hyoung Lee
Korean J. Met. Mater. 2024;62(4):306-311.   Published online 2024 Mar 29
DOI: https://doi.org/10.3365/KJMM.2024.62.4.306

In this study, we enhanced the flexural strength of cordierite ceramics by incorporating h-BN (hexagonal boron nitride) nanoparticles, facilitated by the slip casting process. Initially, commercial cordierite powder with an average particle size of 10 mm underwent a ball-milling process to reduce the size to 2.5 mm and simultaneously achieve..... More

Improvement in the Hydrogen-Storage Properties of Mg<sub>2</sub>Ni by Adding LiBH<sub>4</sub>
Young Jun Kwak, Myoung Youp Song, Ki-Tae Lee
Korean J. Met. Mater. 2024;62(4):299-305.   Published online 2024 Mar 29
DOI: https://doi.org/10.3365/KJMM.2024.62.4.299

To improve the hydrogen-storage properties of Mg2Ni, LiBH4 was added by milling in hydrogen atmosphere (reactive mechanical milling, RMM). Mg2Ni-10LiBH4 was prepared with a composition of 90 wt% Mg2Ni + 10 wt% LiBH4. The quantity of released hydrogen (Hr) versus temperature T curve for Mg2Ni10LiBH4 was obtained by heating at..... More

Surfactant Composition Dependent Evolution of Electronic/Structural Properties of P3HT Nanoparticle Colloids Synthesized via Mini-Emulsion Technique
Byoung-Nam Park
Korean J. Met. Mater. 2024;62(4):284-291.   Published online 2024 Mar 29
DOI: https://doi.org/10.3365/KJMM.2024.62.4.284

: This study investigates the influence of surfactant (sodium dodecyl sulfate, SDS) concentration on the size and optoelectronic properties of poly(3-hexylthiophene) (P3HT) nanoparticles (NPs) synthesized via the mini-emulsion technique. P3HT NPs were fabricated with varying SDS concentrations. The size dependent optoelectronic properties, including the highest occupied molecular orbital (HOMO) and..... More

Development of Electrolyte with Enhanced Corrosion Resistance for Sn Electroplating on Multi-Layer Ceramic Capacitors
고신뢰성 적층 세라믹 커패시터를 위한 침식방지형 주석도금액 개발
Bonil Ku, Junseong Kim, Yujin Son, Kyeongseok Min, Sung-Hyeon Baeck
구본일, 김준성, 손유진, 민경석, 백성현
Korean J. Met. Mater. 2024;62(3):180-189.   Published online 2024 Mar 5
DOI: https://doi.org/10.3365/KJMM.2024.62.3.180

Capacitors not only store and release electricity but selectively conduct alternating current. Among the various types of capacitors, multi-layer ceramic capacitors (MLCCs) have been widely used in automotive, smartphone, and wearable devices because of their compact size and high capacitance capabilities. In this study, we have developed an electrolyte for..... More

Comparison of Weldability and Microstructure in Resistance Spot Welding of Aluminum 5052-H32 Alloy and Al 6014-T4 Alloy
알루미늄 5052-H32 합금과 6014-T4 합금의 저항 점 용접 시 용접성 및 미세조직 비교
Hyun-Uk Jun, Jaehun Kim, Wonho Kim, Jooyong Cheon, Ki-Man Bae, Eun-Kyung Lee, Yeong-Do Park, Changwook Ji
전현욱, 김재훈, 김원호, 천주용, 배기만, 이은경, 박영도, 지창욱
Korean J. Met. Mater. 2024;62(1):1-11.   Published online 2023 Dec 29
DOI: https://doi.org/10.3365/KJMM.2024.62.1.1

This study was performed to compare the resistance spot weldability of Al 5052-H32 alloy and Al 6014-T4 alloy, and the cause of the differences in the weldability was investigated. In general, the surface of the aluminum alloy has an oxide film several nm thick, and local heat input is generated..... More

Effect of Ion Flux Variation in DC Magnetron Sputtering on the Deposition of Cubic Boron Nitride Film
DC 마그네트론 스퍼터링에서 입방정 질화붕소 박막의 증착 거동에 미치는 이온 플럭스 변화의 영향
Young-Hwan Choi, Joo-Youl Huh, Young-Joon Baik
최영환, 허주열, 백영준
Korean J. Met. Mater. 2023;61(11):824-829.   Published online 2023 Oct 29
DOI: https://doi.org/10.3365/KJMM.2023.61.11.824

Cubic boron nitride (cBN) thin films were deposited using DC magnetron sputtering, and the effect of the ion flux on the deposition behavior and residual stress of the cBN thin films was investigated. To increase the ion flux, the magnetic force ratio of the central/peripheral permanent magnets inserted in the..... More

The Effect of Ni Interlayer Formation Plating Bath on the Suppression of Oxidation of Ag-Coated Cu Flakes
Ag 코팅 Cu 플레이크의 산화 억제에 미치는 Ni interlayer 형성 도금욕의 영향
Ji Hwan Kim, Jong-Hyun Lee
김지환, 이종현
Korean J. Met. Mater. 2023;61(10):748-759.   Published online 2023 Sep 25
DOI: https://doi.org/10.3365/KJMM.2023.61.10.748

To suppress Ag dewetting from around 200 oC in Ag-coated Cu (Cu@Ag) flakes, Ag and Ni-coated Cu (Cu@Ni@Ag) flakes were fabricated by successive Ni and Ag electroless plating. The Ni bath type was an important consideration to induce differences in the Ag dewetting and resultant Cu oxidation. An acid Ni..... More

                   Web of Science 1  Crossref 1
Development of Wet Chemical Analysis Technique for Tramp Elements (M = As, Pb, Sb, and Sn) in Silver-M Alloys
Won-Bum Park, Yong-Woo Kim, Sun-Joong Kim, Youn-Bae Kang
Korean J. Met. Mater. 2023;61(9):694-703.   Published online 2023 Aug 30
DOI: https://doi.org/10.3365/KJMM.2023.61.9.694

Wet chemical analysis techniques for four elements (M = As, Pb, Sb, and Sn) in Ag – M binary alloys were investigated with emphasis on the choice of solvent acid and the characteristic wavelength used in the ICP-AES (Inductively-Coupled Plasma Atomic Emission Spectrometer) analysis. The elements are representative tramp elements..... More

                   Web of Science 1  Crossref 1
Effects of Stacking Number on Microstructure and Mechanical Properties for Cold Roll Bonding Process of Dissimilar Aluminum Alloy Sheets
Seong-Hee Lee
Korean J. Met. Mater. 2023;61(9):652-658.   Published online 2023 Aug 30
DOI: https://doi.org/10.3365/KJMM.2023.61.9.652

A cold roll-bonding (CRB) process is applied to study the effects of stacking number on the microstructure and mechanical properties of roll-bonded and age-treated Al sheets. Commercial AA1050 and AA6061 sheets with a thickness of 2 mm were stacked alternately on each other to two and four layers, and roll-bonded..... More

                   Web of Science 5  Crossref 5
Development of Numerical Analysis Model for New Magnesium Electrolysis Process Using COMSOL
COMSOL을 활용한 신 마그네슘 전해 공정 수치해석 모델 개발
MaeHyun Cho, Hyeong-Jun Jeoung, Jungshin Kang, Kunok Chang
조매현, 정형준, 강정신, 장근옥
Korean J. Met. Mater. 2023;61(8):625-631.   Published online 2023 Jul 24
DOI: https://doi.org/10.3365/KJMM.2023.61.8.625

Magnesium (Mg) has good physical properties including light weight, excellent specific strength and high stiffness, and Mg is used in many fields. But current production methods of Mg have disadvantages, such as the generation of sulfur oxide and chlorine gas. In this situation, The Korea Institute of Geoscience and Mineral..... More

                   Web of Science 2  Crossref 3
Utilizing Dip-Coating to Fabricate Gate Dielectric and Semiconductor for Thin-Film Transistors
딥코팅 방법을 활용한 게이트 산화물 유전체 및 반도체 박막의 제조 및 박막트랜지스터 응용
Yongwan Kim, Young-Geun Ha
김용완, 하영근
Korean J. Met. Mater. 2023;61(8):581-588.   Published online 2023 Jul 20
DOI: https://doi.org/10.3365/KJMM.2023.61.8.581

The potential applications of advanced electronic materials in large-area, printable, and flexible electronics have generated significant interest. However, creating high-performance, low-voltage thin-film transistors (TFTs) for these applications remains difficult due to a lack of advanced gate dielectric and semiconductor materials that meet both ease-of-fabrication requirements and high electrical performance. In..... More

Microstructural Evolution and Mechanical Properties According to Aging Conditions of Ti-5Mo-2Fe Alloy
Ti-5Mo-2Fe 합금의 시효처리 조건에 따른 미세조직 변화 및 기계적 특성
Hong-Min Kim, Se-Yeong Park, Dong-Geun Lee
김홍민, 박세영, 이동근
Korean J. Met. Mater. 2023;61(8):545-552.   Published online 2023 Jul 20
DOI: https://doi.org/10.3365/KJMM.2023.61.8.545

Beta-type titanium alloys have a low elastic modulus, excellent cold workability, and are widely used as implant materials. High strength is possible by forming a precipitation in the β-matrix via solution treatment and aging treatment. However, beta titanium alloys require a large amount of beta-stabilizing elements (Fe, Nb, Mo, Ta,..... More

                   Web of Science 3  Crossref 3
Microstructural Evolutions and Strengthening Mechanism according to the Aging Temperatures of a High Si Cast Aluminum Alloy
Won-Sang Shin, Yoon-Jun Kim
Korean J. Met. Mater. 2023;61(7):524-533.   Published online 2023 Jun 21
DOI: https://doi.org/10.3365/KJMM.2023.61.7.524

A356 cast aluminum alloy contains 7 at.% Si and 0.3 at.% Mg, producing an approximately 50% eutectic microstructure. This high Si content and various casting conditions play a significant role in strengthening A356 alloy, by controlling the eutectic morphology and precipitates of other intermetallic compounds. Understanding how Si-related precipitates and..... More

                   Web of Science 1  Crossref 1
Effect of Oxygen Concentration on the Growth and Cathodoluminescence Properties of MgO Nanowires
MgO 나노선의 성장과 음극선 발광 특성에 미치는 산소 농도의 영향
Geun-Hyoung Lee
Korean J. Met. Mater. 2023;61(7):509-513.   Published online 2023 Jun 21
DOI: https://doi.org/10.3365/KJMM.2023.61.7.509

MgO nanowires were grown by a thermal evaporation method at different N2/O2 gas ratios in order to investigate the effect of oxygen concentration on the growth and luminescence properties of the MgO nanowires. A thermal evaporation process was conducted at 1000oC and under a pressure of 500Torr. No nanowires were..... More

Flexible Transparent Planar Heater Comprising ZnO/Cu/Al<sub>2</sub>O<sub>3</sub>
ZnO/Cu/Al2O3 구조의 유연 투명 면상발열체 연구
Heechang Kim, Dooho Choi
김희창, 최두호
Korean J. Met. Mater. 2023;61(7):480-488.   Published online 2023 Jun 21
DOI: https://doi.org/10.3365/KJMM.2023.61.7.480

In this study, we fabricated transparent heaters composed of an ultrathin Cu-layer heating element sandwiched between a ZnO underlayer and an Al2O3 overlayer. With the Cu layer thickness fixed at 8.5 nm, the thicknesses of the ZnO and Al2O3 layers were independently varied to reach the optimum antireflecting condition (maximum..... More

Branched MgO Nanowires Synthesized by Thermal Evaporation Method in Air at Atmospheric Pressure
대기압의 공기 분위기에서 열증발법에 의해 합성된 가지상 구조의 MgO 나노선
Geun-Hyoung Lee
Korean J. Met. Mater. 2023;61(6):444-448.   Published online 2023 May 18
DOI: https://doi.org/10.3365/KJMM.2023.61.6.444

MgO nanowires with a branched structure were fabricated using a thermal evaporation method in air at atmospheric pressure. The branched MgO nanowire was made up of two parts: a primary central nanowire trunk and lots of secondary nanowire branches. The branched MgO nanowires had a 4-fold symmetrical structure. The secondary..... More

Machine Learning-Based Prediction of Grain Size from Colored Microstructure
기계학습을 이용한 색상형 미세조직의 결정립 크기 측정
Jun-Ho Jung, Hee-Soo Kim
정준호, 김희수
Korean J. Met. Mater. 2023;61(5):379-387.   Published online 2023 Apr 20
DOI: https://doi.org/10.3365/KJMM.2023.61.5.379

We constructed a convolutional neural network to estimate average grain size from microstructure images. In the previous study from our research group, the network was trained using GB-type images in which the grain matrix and grain boundary were represented in white and black, respectively. The model well estimated the same..... More

                   Web of Science 1  Crossref 1
A Study on the History of Advances in Ancient Iron Making Based on Correlation of Oxides in Slag
슬래그 내 산화물의 상관관계로 보는 고대 제철 발전사 연구
Gwang Seob Oh, Won Seop Jung
오광섭, 정원섭
Korean J. Met. Mater. 2023;61(4):291-300.   Published online 2023 Mar 22
DOI: https://doi.org/10.3365/KJMM.2023.61.4.291

A lot of slag was produced by ancient production processes such as smelting, melting, and refining. Iron slag has information that can be used to determine the characteristics of the site, the iron-making process and manufacturing date, but there is a limit to reading information through visual observation and nondestructive..... More

                   Crossref 1
All-Solution-Processed OLEDs Using Printed Ag Electrodes and a PEI Bonding Layer
은 인쇄 전극과 PEI 접착 층을 사용한 용액공정 OLED
Cheol-Hee Moon
Korean J. Met. Mater. 2023;61(3):175-182.   Published online 2023 Feb 24
DOI: https://doi.org/10.3365/KJMM.2023.61.3.175

We demonstrated a bonding technology using polyethyleneimine (PEI) as a bonding layer between printed Ag electrodes and an emission material layer (EML) to fabricate all-solution-processed Organic LightEmitting Diodes (OLEDs). We manufactured Ag electrodes on a glass substrate by the screen printing method, which was bonded to another substrate with ITO..... More

                   Web of Science 1  Crossref 1
Predicting Grain Structure in Continuously-Cast Stainless Steel Slab
연속주조 스테인리스강 슬라브의 결정립 조직 예측
Hee-Soo Kim, Ji-Joon Kim
김희수, 김지준
Korean J. Met. Mater. 2023;61(1):60-68.   Published online 2022 Dec 28
DOI: https://doi.org/10.3365/KJMM.2023.61.1.60

Macrostructural features in continuously-cast stainless steel slabs such as the distribution of equiaxed and columnar grains, and microporosity, are crucial to the post-processes, and the mechanical properties of the final steel products. Among the methods for controlling grain structure during the continuous casting process, the application of electromagnetic stirring (EMS)..... More

                   Web of Science 2  Crossref 2
Fabricating and Probing Forsterite Li-ion Battery Anode Electrodes
Forsterite 리튬 이온 배터리 음극 제조 및 전기화학적 반응 탐침
Dong-Ju Kim, Byoung-Nam Park
김동주, 박병남
Korean J. Met. Mater. 2022;60(11):851-857.   Published online 2022 Oct 31
DOI: https://doi.org/10.3365/KJMM.2022.60.11.851

In an effort to minimize irreversible capacity loss and volume expansion, research on Si nanocomposite materials with a SiOx/Mg2SiO4/SiOx structure through a magnesiothermic reduction process (MTR) has attracted much attention from researchers. Mg2SiO4(forsterite) has been shown to improve the initial coulombic efficiency (ICE) by minimizing the irreversible capacity loss due..... More

                   Web of Science 2  Crossref 1
Paste Containing 1.5 m Ag Particles with Enhanced Surface Area: Ultrafast Thermo-Compression Sinter-Bonding and Annealing Effects
표면적이 발달된 1.5 μm Ag 입자 기반 페이스트의 초고속 열압착 소결접합 및 열처리 효과
Yeongjung Kim, Byeong Jo Han, Jong-Hyun Lee
김영중, 한병조, 이종현
Korean J. Met. Mater. 2022;60(11):827-836.   Published online 2022 Oct 31
DOI: https://doi.org/10.3365/KJMM.2022.60.11.827

To rapidly sinter a bondline and obtain mechanical stability at high temperature and high thermal conductivity, 1.5 μm Ag particles with enhanced surface area were synthesized by a wet-chemical method, and a sinter-bonding paste containing these Ag particles was obtained. Some particles were present in the form of agglomerates of..... More

                   Web of Science 3  Crossref 3
Effect of Microstructure on Strain Aging and Hydrogen Embrittlement Behavior of Bake Hardening Steels
소부경화강의 변형 시효 및 수소취성 거동에 미치는 미세조직의 영향
Jae-Yun Kim, Seok-Woo Ko, Byoungchul Hwang
김재윤, 고석우, 황병철
Korean J. Met. Mater. 2022;60(11):811-818.   Published online 2022 Oct 31
DOI: https://doi.org/10.3365/KJMM.2022.60.11.811

The strain aging and hydrogen embrittlement behavior of two bake hardening (BH) steels with different microstructures were investigated in this study. The single-phase BH steel was composed of fully ferrite, while the dual-phase BH steel consisted of ferrite and 3 % martensite. The BH index and aging index (AI) of..... More

                   Web of Science 3  Crossref 3
Bronze Production Systems in 6-7 Centuries South Korea: Micro-Structural and Micro-Chemical Analysis of Slags
슬래그의 미세구조 및 화학분석을 통한 6-7세기 한국의 청동 야금 기술 연구
So Jin Kim, Woo Rim Han, Dong Hyeok Moon, Na Ra Lee, Young Do Kim
김소진, 한우림, 문동혁, 이나라, 김영도
Korean J. Met. Mater. 2022;60(10):774-781.   Published online 2022 Sep 29
DOI: https://doi.org/10.3365/KJMM.2022.60.10.774

Metallurgical remains such as crucible, mould, slag and tuyere are generated in the production of bronze. The analysis of slag in particular can be used to identify the raw materials, processes and environments (temperature and condition) employed in the bronze fabrication . The Gwanbuk-ri site in Buyeo is known as..... More

                   Web of Science 1  Crossref 1
Ultrathin MgO Nanosheets Fabricated by Thermal Evaporation Method in Air at Atmospheric Pressure
대기압의 공기 분위기에서 열증발법에 의해 제작된 초박형 MgO 나노시트
Geun-Hyoung Lee
Korean J. Met. Mater. 2022;60(10):769-773.   Published online 2022 Sep 29
DOI: https://doi.org/10.3365/KJMM.2022.60.10.769

Ultrathin MgO nanosheets were successfully synthesized by thermal evaporation of a mixture of Mg and graphite powders as the source material. The synthesis was performed at 1000 oC in air. Scanning electron microscopy showed that the two-dimensional MgO nanosheets had widths of several micrometers and the thickness of less than..... More

                   Web of Science 2  Crossref 2
Fabrication and Surface Modification of Macroporous Silica Fibers by Electrospinning for Super Adsorbent of Oil
Hoai Han Nguyen, Thi Thu Hien Nguyen, Young-Sang Cho
Korean J. Met. Mater. 2022;60(10):732-743.   Published online 2022 Sep 29
DOI: https://doi.org/10.3365/KJMM.2022.60.10.732

Silica fibers were fabricated by sol-gel reaction and an electrospinning process. A high voltage source of electricity was applied to the prepared spinning solution to form the fibers. Macroporous silica fibers were prepared using polystyrene (PS) nanospheres as templates after calcination. The pore size could be controlled by adjusting the..... More

                   Web of Science 4  Crossref 4
Analysis of Tensile Deformation Behavior of Rolled AZ31 Mg Alloy Subjected to Precompression and Subsequent Annealing Using DIC
DIC를 활용한 선압축과 후열처리 공정을 거친 AZ31 마그네슘 압연재의 인장 변형 거동 분석
Gyo Myeong Lee, Jung Eun Kim, Sung Hyuk Park
이교명, 김정은, 박성혁
Korean J. Met. Mater. 2022;60(9):701-712.   Published online 2022 Aug 30
DOI: https://doi.org/10.3365/KJMM.2022.60.9.701

This study investigates the effects of precompression and subsequent annealing on the tensile deformation behavior of a rolled AZ31 Mg alloy at room temperature using digital image correlation (DIC). When the as-rolled sample (AR sample) is subjected to precompresssion along the rolling direction (RD) and transverse direction (TD), the sample’s..... More

                   Web of Science 1  Crossref 2
Enhancing mechanical properties of Mg-Gd-Y-Zn alloys via microalloying with Ce and La
Zhaobin Zhang, Jonghyun Kim, Hongxin Liao, Ki Buem Kim, Taekjib Choi, Taekyung Lee, Fusheng Pan
김기범, 최택집, 이태경,
Korean J. Met. Mater. 2022;60(9):654-667.   Published online 2022 Aug 30
DOI: https://doi.org/10.3365/KJMM.2022.60.9.654

This study investigated the microstructure and mechanical properties of Mg-1Gd-1Y-1Zn (at.%) alloys containing designed amounts of Ce or La. The Mg5(Gd,Zn) phase formed in the as-cast Mg-Gd-Y-Zn-Ce/La alloys and disappeared after a homogenization treatment at 500°C for 24 h. The addition of Ce and La resulted in the formation of..... More

                   Web of Science 1  Crossref 2
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