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Improvement of Photoelectrochemical Properties of CuO Photoelectrode by Li Doping
Li 도핑에 따른 CuO 광전극의 광전기화학적 특성 개선 연구
Seongchan Bae, Sunghyeok Lee, Hyukhyun Ryu, Won-Jae Lee
배성찬, 이성혁, 류혁현, 이원재
Korean J. Met. Mater. 2022;60(8):577-586.   Published online 2022 Jul 12
DOI: https://doi.org/10.3365/KJMM.2022.60.8.577

We fabricated a Li doped CuO photoelectrode by doping CuO with Li to improve the photoelectrochemical properties of the CuO photoelectrode. The fabricated Li doped CuO photoelectrode was optimized by experimentally investigating Li doping concentration, annealing temperature, and spin coating deposition cycle. It was confirmed that Li doped CuO had..... More

A Study on Reduced Graphene Oxide in Large-area Transparent Heaters for Defrosting
성에 제거용 대면적 투명 히터를 위한 환원된 산화 그래핀 연구
Seung Geun Jo, Hae-In Moon, Young Won Kim, Hwan Soo Dow, Jung Woo Lee
조승근, 문해인, 김영원, 도환수, 이정우
Korean J. Met. Mater. 2022;60(8):570-576.   Published online 2022 Jul 12
DOI: https://doi.org/10.3365/KJMM.2022.60.8.570

Transparent heaters are promising devices because of their versatile applications in vehicles, smart windows, and sensors, etc. Indium tin oxide is widely used for transparent heater materials due to its high electronic conductivity and visible light transmittance. However, the cost of indium is too high, and its fabrication needs sophisticated..... More

Enhancement of thermoelectric power factor by modulation doping of bulk polycrystalline SnS / thin film PEDOT:PSS bilayer
벌크 다결정 SnS / PEDOT:PSS 박막 이중층에서의 변조 도핑을 통한 열전 역률 강화
Dongwook Lee
Korean J. Met. Mater. 2022;60(7):531-536.   Published online 2022 Jun 3
DOI: https://doi.org/10.3365/KJMM.2022.60.7.531

Modulation doping occurs in a heterojunction where a charge carrier-rich material transfers charge to a carrier-deficient material. The modulation-doped material is intentionally selected to have higher charge carrier mobility than the modulation dopant material, so that the overall electrical conductivity can be boosted. Although this modulation doping strategy has proven..... More

Electrochemical Performance of the Ni-Fe Based Metal-Support Solid Oxide Fuel Cell with Ba-Sr-Co-Fe-O and La-Sr-Mn-O Cathodes
Ba-Sr-Co-Fe 산화물과 La-Sr-Mn 산화물 양극을 포함하는 Ni-Fe 기반 금속지지형 고체산화물 연료전지의 전기화학적 성능
Sang Eun Lee, Jun Seo Park, Hee Jung Park
이상은, 박준서, 박희정
Korean J. Met. Mater. 2022;60(7):523-530.   Published online 2022 Jun 3
DOI: https://doi.org/10.3365/KJMM.2022.60.7.523

Unlike conventional solid oxide fuel cells (SOFCs) where ceramic materials have been used as a support, in this study a new SOFC structure with a metal support and a contact layer between the support and anode is suggested. A mixture of Ni-Fe alloy and zirconia ceramics as the contact layer..... More

Enhanced Photoelectrochemical Water-Splitting through Application of Layer by Layer (LBL) and Hydrothermal (HT) Methods in TiO<sub>2</sub> and -Fe<sub>2</sub>O<sub>3</sub> Hierarchical Structures
Aryan Azad, Sun Jae Kim
Korean J. Met. Mater. 2022;60(7):517-522.   Published online 2022 Jun 3
DOI: https://doi.org/10.3365/KJMM.2022.60.7.517

Improving solar energy conversion efficiency and reducing energy loss have become critical issues in recent decades. Photoelectrochemical (PEC) water splitting provides an ideal method for solar energy harvesting and is a key factor in decreasing the use of fossil fuels. Thus, it is extremely important to identify cost-effective, highly active,..... More

Continuous Synthesis of Monodisperse Spherical Silica Powder Using Tubular Reaction System
Young-Sang Cho, Chiyeop Hwang, Seong-Jun Kim, U-Hyeon Park
Korean J. Met. Mater. 2022;60(6):409-422.   Published online 2022 May 24
DOI: https://doi.org/10.3365/KJMM.2022.60.6.409

In the present study, monodisperse silica nanospheres were synthesized using a tubular reaction system in a continuous way. Screw-type blades were inserted inside a T-mixer for static mixing of the reactant streams which consisted of TEOS and NH4OH/H2O diluted with ethanol, for the continuous synthesis of the silica suspension. The..... More

Preparation and Investigation of Thermoelectric Properties of Cu<sub>3</sub>SbS<sub>4</sub>-Cu<sub>3</sub>SbSe<sub>4</sub> Solid Solutions
Go-Eun Lee, Il-Ho Kim
Korean J. Met. Mater. 2022;60(5):384-390.   Published online 2022 Apr 22
DOI: https://doi.org/10.3365/KJMM.2022.60.5.384

Cu-based ternary chalcogenides composed of earth-abundant and nontoxic elements are considered promising thermoelectric materials, although there are few reports on them. In our previous studies, optimal mechanical alloying (MA) and hot pressing (HP) were used to synthesize Cu3SbS4 (famatinite) and Cu3SbSe4 (permingeatite). In this study, solid solutions of Cu3SbS4-ySey (y..... More

Kerfless Si Wafering Using Al Metal Paste, Epoxy and Ni Electroplating as Stress-Induced Layer
Young Joon Cho, Hyo Sik Chang
Korean J. Met. Mater. 2022;60(5):370-375.   Published online 2022 Apr 22
DOI: https://doi.org/10.3365/KJMM.2022.60.5.370

Kerfless wafering is a beneficial technique that enhances the cost effectiveness of crystalline silicon (c-Si) solar cells, preventing silicon (Si) waste during diamond sawing. This study compared the advantages of three stress layers for kerfless wafering: aluminum (Al) paste, epoxy-, and electroplated nickel (Ni). These materials demonstrated the ability to..... More

Effect of Cu on the Microstructure of Al-8Zn-2.5Mg-xCu Alloys Fabricated by Twin roll casting
박판주조법으로 제조한 Al-8Zn-2.5Mg-xCu 합금 판재의 미세조직에 미치는 Cu의 영향
Dong-Guk Kim, Yong hee Jo, Yun-Soo Lee, Yong-You Kim, Hyoung-Wook Kim, Jung-Ki Kim
김동국, 조용희, 이윤수, 김용유, 김형욱, 김정기
Korean J. Met. Mater. 2022;60(4):329-339.   Published online 2022 Mar 28
DOI: https://doi.org/10.3365/KJMM.2022.60.4.329

The effect of Cu content on the microstructure and mechanical properties of Al-8.0Zn-2.5Mg-xCu (x: 0, 1, 2, 3) aluminum alloys manufactured by the twin-roll casting process was investigated. The Al-8.0Zn-2.5Mg-xCu alloy showed an increase in surface defects with increasing Cu content. This is because the amount of residual liquid in..... More

Hydration Deformation Behaviors of Scaffolds of Tricalcium Silicate/Tricalcium Aluminate Mixtures Printed Using the Fused Deposition Modelling (FDM)
Yeongjin Koo, Myung-Hyun Lee, Seog Young Yoon, Yoonjoo Lee
구영진, 이명현, 윤석영, 이윤주
Korean J. Met. Mater. 2022;60(4):321-328.   Published online 2022 Mar 28
DOI: https://doi.org/10.3365/KJMM.2022.60.4.321

3D printing technology has advanced rapidly over the last decade. However, for ceramic materials, drying and sintering steps are required after printing, and excessive shrinkage that occurs during these steps is a major factor that has hindered the development of the ceramic 3D printing technology. In this study, a non-sintering..... More

A Study on Ceramic Heater Devices Based on Si<sub>3</sub>N<sub>4</sub> with a MoO<sub>3</sub> Protective Layer
MoO3 보호막 적층 Si3N4 기반 세라믹 히터 소자 연구
Yong Min Jeon, Si Hong Ryu, Seon Ho Kim, Seong Eui Lee
전용민, 유시홍, 김선호, 이성의
Korean J. Met. Mater. 2022;60(4):301-306.   Published online 2022 Mar 28
DOI: https://doi.org/10.3365/KJMM.2022.60.4.301

Currently, the need for high performance heaters for industrial application is increasing, and repeated wear, rapid temperature change, and uneven temperature can cause deteriorating quality and reduced productivity. The ceramic heater in this study consists of a substrate, an electrode layer, and a protective layer, and low-melting temperature glass frit..... More

Microstructure and Mechanical Properties of Vacuum Centrifugal Casted Ti-6Al-4V Alloy by Casting and Heat Treatment
진공 원심 주조된 Ti-6Al-4V 합금의 주조 및 열처리에 따른 미세조직과 기계적 특성
Hyun-Woo Lee, Byeong-Ook Kong, Seung Eon Kim, Yunkon Joo, Sukhyun Yoon, Je Hyun Lee
이현우, 공병욱, 김승언, 주윤곤, 윤석현, 이재현
Korean J. Met. Mater. 2022;60(4):282-290.   Published online 2022 Mar 28
DOI: https://doi.org/10.3365/KJMM.2022.60.4.282

The Ti-6Al-4V alloy has been widely used for structural materials due to high specific strength property, however it is difficult to cast because of high reactivity at high temperature. In this study casting characteristics and post-casting heat treatment were studied in the cast Ti alloy. The cast alloy was prepared..... More

                           Cited By 1
Separation of Pd(II) and Zn(II) by Solvent Extraction using Commercial Extractants from Hydrochloric Acid Leaching Solution of Cemented Pd from Spent Electroplating Solutions
도금폐액에 함유된 팔라듐의 아연치환물 염산침출액에서 상용화추출제를 이용한 용매추출로 팔라듐(II)과 아연(II)의 분리
Si Jeong Song, Viet Nhan Hoa Nguyen, Man Seung Lee
송시정, Viet Nhan Hoa Nguyen, 이만승
Korean J. Met. Mater. 2022;60(3):188-197.   Published online 2022 Feb 8
DOI: https://doi.org/10.3365/KJMM.2022.60.3.188

The demand for palladium (Pd) has increased and this has made it necessary to recover pure Pd from diverse secondary resources. To recover the small amount of Pd(II) present in spent electroplating solutions, Pd(II) is concentrated by cementation with zinc metal. In this work, a hydrometallurgical process consisting of leaching..... More

Separation of Pd(II) and Zn(II) from Sulfuric Acid Solution by Commercial Extractants
황산용액에서 상용화 추출제에 의한 팔라듐(II)과 아연(II)의 분리
Si Jeong Song, Viet Nhan Hoa Nguyen, Man Seung Lee
송시정, Viet Nhan Hoa Nguyen, 이만승
Korean J. Met. Mater. 2022;60(2):132-140.   Published online 2022 Jan 12
DOI: https://doi.org/10.3365/KJMM.2022.60.2.132

Spent electroplating solutions contain a small amount of Pd(II). This Pd(II) can be concentrated by cementation with zinc metal powder. In order to recover pure palladium, a hydrometallurgical process consisting of leaching followed by solvent extraction was developed in this work. First, suitable extractants for the selective extraction of Pd(II)..... More

                           Cited By 1
Effect of Repeated Repair Welding on the Mechanical Properties and Pitting Corrosion Resistance of Super Duplex Stainless Steel
슈퍼듀플렉스 스테인리스강의 반복 수정용접이 기계적 물성과 공식저항성에 미치는 영향
Yusung Kim, Seongkil Nam, Myeonghwan Choi, Namhyun Kang
김유성, 남성길, 최명환, 강남현
Korean J. Met. Mater. 2022;60(2):114-123.   Published online 2022 Jan 12
DOI: https://doi.org/10.3365/KJMM.2022.60.2.114

The study investigated the effect of repeated repair welding on the mechanical properties and pitting corrosion resistance of 25% Cr super duplex stainless steels (UNS S32750). The test coupons were prepared by gas tungsten arc welding (GTAW) with ER2594 filler metal and repaired 3-times at the same weld locations, where..... More

Effects of Si and Sn Contents and Heat-Treatment Temperature on the Corrosion Behavior of AISI 439 Ferrite Stainless Steel
Chan Yang Kim, Do hyung Kim, Won sub Chung
Korean J. Met. Mater. 2022;60(1):26-34.   Published online 2021 Dec 10
DOI: https://doi.org/10.3365/KJMM.2022.60.1.26

This study was conducted to evaluate the corrosion resistance and optimize the heat-treatment process of AISI 439 ferrite stainless steel silicon and tin alloys with reduced chromium. The microstructure of the specimens and deposition under each condition were analyzed. The production of oxide films was compared based on the thickness..... More

Exploring Binder and Solvent for Depositing Activated Carbon Electrode on IndiumTin-Oxide Substrate to Prepare Supercapacitors
슈퍼커패시터 전극 제조시 Indium-Tin-Oxide기판 위 활성탄 증착에 적합한 바인더와 용매 소재
Young Mook Choi, Sang-Eun Chun
최영묵, 전상은
Korean J. Met. Mater. 2021;59(12):911-920.   Published online 2021 Nov 19
DOI: https://doi.org/10.3365/KJMM.2021.59.12.911

Supercapacitor electrode slurry is prepared for mass production by mixing activated carbon powder, conductive agent, and binder, which is then deposited on a substrate using the doctor-blade method. Polyvinylidene fluoride (PVDF) and 1-methyl-2-pyrrolidone (NMP) are used as binder and solvent, respectively, to form the electrode slurry on a metal substrate...... More

The Effect of Preheating Current on the Melting Behavior of Bolt Projection Welding of Al-Si Coated Hot-Stamped Boron Steel
Al-Si 도금된 핫스탬핑 보론강의 볼트 프로젝션 용접시 예열 통전이 용융 거동에 미치는 영향
Jae-Hun Kim, Hyun-Uk Jun, Joo-Yong Cheon, Jae-won Kim, Jae-deuk Kim, Changwook Ji
김재훈, 전현욱, 천주용, 김재원, 김재득, 지창욱
Korean J. Met. Mater. 2021;59(12):893-903.   Published online 2021 Nov 19
DOI: https://doi.org/10.3365/KJMM.2021.59.12.893

This study evaluated the effect of preheating on early stage melting behavior of a Al-Si coated hot stamped boron steel bolt during projection welding. A large amount of heat was generated in the early stage of projection welding. Because of the large heat generation, a rapid collapse of the projection..... More

Formation of Surface-Wrinkled Metal Nanosheets via Thermally Assisted Nanotransfer Printing
열보조 나노 전사 프린팅을 통한 금속 박막의 표면 주름 나노패턴 형성 방법
Tae Wan Park, Woon Ik Park
박태완, 박운익
Korean J. Met. Mater. 2021;59(12):880-885.   Published online 2021 Nov 19
DOI: https://doi.org/10.3365/KJMM.2021.59.12.880

Nanopatterning methods for pattern formation of high-resolution nanostructures are essential for the fabrication of various electronic devices, including wearable displays, high-performance semiconductor devices, and smart biosensor systems. Among advanced nanopatterning methods, nanotransfer printing (nTP) has attracted considerable attention due to its process simplicity, low cost, and great pattern resolution. However,..... More

Microstructure and Wear Properties of Al 7075 Alloy Manufactured by Twin-Roll Strip Casting Process
Twin-Roll Strip Casting 공정으로 제조된 Al 7075 합금의 미세조직 및 마모 특성
Kyoung-Wook Kim, Min-Seok Baek, Kwangjun Euh, Kee-Ahn Lee
김경욱, 백민석, 어광준, 이기안
Korean J. Met. Mater. 2021;59(12):870-879.   Published online 2021 Nov 19
DOI: https://doi.org/10.3365/KJMM.2021.59.12.870

Al 7075 alloy was manufactured using the twin-roll strip casting (TRC) process, and the mechanical and wear properties of the fabricated TRC process were investigated. To compare the properties of the alloy manufactured by TRC, another Al 7075 alloy was fabricated by conventional direct chill (DC) casting as a comparative..... More

                           Cited By 1
Nano Silicon Composite with Gelatin/Melamine Derived N-doped Carbon as an Efficient Anode Material for Li-ion Batteries
Venugopal Nulu
Korean J. Met. Mater. 2021;59(11):802-812.   Published online 2021 Oct 28
DOI: https://doi.org/10.3365/KJMM.2021.59.11.802

Silicon (Si) has a high theoretical capacity and low working potential vs. Li/Li+, and has been investigated as the most capable negative electrode material for lithium-ion batteries (LIBs). However, Si undergoes significant volume changes during the Li+ alloying/ dealloying processes, leading to unstable cycle life and limiting its practical applicability..... More

Effect of Joule-Heating Treatment on the Microstructure and Physical Properties of 16-Stranded Compressed Copper Wires
Jin-Ju Choi, Byoungyong Im, Yubin Kang, Dae-Geun Kim
최진주, 임병용, 강유빈, 김대근
Korean J. Met. Mater. 2021;59(11):796-801.   Published online 2021 Oct 28
DOI: https://doi.org/10.3365/KJMM.2021.59.11.796

Compressed wires are produced by cross-sectionally compressing stranded conductors, which results in a smaller conductor diameter. This also leads to a lower weight wire, because a thinner external insulated coating can be used, compared to the low-voltage wires typically used in automobiles. However, a post production heat treatment of the..... More

Low Temperature Growth of One-Dimensional Al and Al<sub>2</sub>O<sub>3</sub> Nano/Micro-Structures Using Al and SnO<sub>2</sub> Powder Mixture
Al과 SnO2 혼합 분말을 사용한 일차원 Al과 Al2O3 나노/마이크로구조의 저온 성장
Geun-Hyoung Lee
Korean J. Met. Mater. 2021;59(9):677-681.   Published online 2021 Aug 4
DOI: https://doi.org/10.3365/KJMM.2021.59.9.677

One-dimensional Al and Al2O3 nano/microstructures were fabricated via thermal oxidation of Al and SnO2 powder mixtures at temperatures below the melting point of Al (660 oC). Furthermore, the synthesis process was carried out in air at atmospheric pressure, which made the process very simple and easy. Sn metal particles with..... More

Evaluation of Cooling Performance of an Additive Manufactured Gravity Die Casting Mold with Conformal Cooling Channel
적층제조 공정으로 구현된 형상 적응형 냉각채널 적용 다이캐스팅 금형의 냉각성능 평가
Yu Jin Park, Eok Soo Kim, Jeong Hun Lee, Ji Hwan Choi, Pil Hwan Yoon, Ho Jeong Kang, Dong Hyun Kim, Yong Ho Park, Jong Wan Ko
박유진, 김억수, 이정훈, 최지환, 윤필환, 강호정, 김동현, 박용호, 고종완
Korean J. Met. Mater. 2021;59(9):652-663.   Published online 2021 Aug 4
DOI: https://doi.org/10.3365/KJMM.2021.59.9.652

A cooling channel with an optimized design provides not only high throughput with gravity die casting, but also guarantees product quality. A conformal cooling channel (CC) whose structure follows the shapes or surfaces of the mold cavity has attracted great attention in the die casting industry, because it allows rapid..... More

Development of PosMAC<sup></sup> Steel and Its Application Properties
고내식 합금도금 PosMAC® 강판의 개발과 응용 특성
Il-Ryoung Sohn, Tae-Chul Kim, Gwang-Il Ju, Myung-Soo Kim, Jong-Sang Kim
손일령, 김태철, 주광일, 김명수, 김종상
Korean J. Met. Mater. 2021;59(9):613-623.   Published online 2021 Aug 4
DOI: https://doi.org/10.3365/KJMM.2021.59.9.613

PosMAC® is a hot dipping Zn-Mg-Al coated steel sheet developed by POSCO. PosMAC®3.0 shows excellent anti-corrosion performance and is suitable for construction and solar energy systems in severe corrosive environments. PosMAC®1.5 has a superior surface quality and is preferred for automotive and home appliances. The advanced anti-corrosion properties of PosMAC®..... More

A Study on the Leaching of Rare Earth Elements from Waste Phosphor Powder
폐형광체 분말로부터 희토류의 회수를 위한 침출 특성 고찰
Gee Hun Lee, Chang Kwon Kim, Dong Hoon Lee, Young Jun Song
이기헌, 김창권, 이동훈, 송영준
Korean J. Met. Mater. 2021;59(7):459-468.   Published online 2021 Jun 16
DOI: https://doi.org/10.3365/KJMM.2021.59.7.459

This study was carried out to obtain data to design a process to recover rare earth elements, specifically Y(Yttrium), La(Lanthanum), Ce(Cerium), Eu(Europium), Tb(Terbium) from waste phosphor powder. For this purpose, we investigated the effect of temperature, concentration, time and acids on leaching of the rare earth elements. The effect of..... More

Effects of JGB Additives on the Microstructures and Electrical Properties of Electroplated Copper Foil
JGB 첨가제에 의한 동박의 미세구조변화와 전기적 특성
Tae-Gyu Woo, Il-Song Park
우태규, 박일송
Korean J. Met. Mater. 2021;59(6):404-411.   Published online 2021 May 26
DOI: https://doi.org/10.3365/KJMM.2021.59.6.404

Extremely thin film high quality copper foil is required to ensure high performance in electronics and slimness in secondary batteries. During the electroplating of copper foil, Janus Green B(JGB) and Collagen were introduced as additives to the electrolytes to study their effects. The structural and electrical properties of the electroplated..... More

                           Cited By 1
Corrosion Behaviors of Super Austenitic Stainless Steel Weld Joints in the As-Welded and Post Weld Heat Treated States
슈퍼 오스테나이트계 스테인리스강 (UNS S31254)의 용접 및 용접 후 열처리 상태에서의 부식거동
Dong min Cho, Jin-seong Park, Won Ki Jeong, Seung Gab Hong, Sung Jin Kim
조동민, 박진성, 정원기, 홍승갑, 김성진
Korean J. Met. Mater. 2021;59(6):374-383.   Published online 2021 May 26
DOI: https://doi.org/10.3365/KJMM.2021.59.6.374

The corrosion behaviors of a combined weld (plasma, gas tungsten arc) joint in a super austenitic stainless steel pipe were investigated using a range of experimental and analytical methods. To ensure superior corrosion resistance, a Ni-based super alloy (Inconel 625) was employed as the welding material only in the gas..... More

                           Cited By 1
Study on A-Site Compositional Mixing for the Shear Coating Process of FA-Based Lead Halide Perovskites
A-site 조성 제어를 통한 FA기반 페로브스카이트의 상안정화 및 전단 코팅 최적화 연구
Hansol Kim, Hyewon Gu, Minju Song, Choong-Heui Chung, Yong-Jun Oh, Chang Eun Song, Ki-Ha Hong
김한솔, 구혜원, 송민주, 정중희, 오용준, 송창은, 홍기하
Korean J. Met. Mater. 2021;59(5):321-328.   Published online 2021 Apr 6
DOI: https://doi.org/10.3365/KJMM.2021.59.5.321

Halide perovskite solar cells have been attracting tremendous attention as next-generation solar cell materials because of their excellent optical and electrical properties. Formamidinium lead tri-iodide (FAPbI3) exhibits the narrowest band gap among lead iodide perovskites and shows excellent thermal and chemical stability, also. However, the large-area coating of FAPbI3 needed..... More

Preparation of Li-Doped Indium-Zinc Oxide Thin-Film Transistor at Relatively Low Temperature Using Inkjet Printing Technology
잉크젯 인쇄 기술을 이용하여 상대적으로 낮은 온도에서 리튬이 도핑 된 인듐-아연-산화물 트랜지스터의 제작
Woon-Seop Choi
Korean J. Met. Mater. 2021;59(5):314-320.   Published online 2021 Apr 6
DOI: https://doi.org/10.3365/KJMM.2021.59.5.314

Inkjet printing is a very attractive technology for printed electronics and a potential alternative to current high cost and multi-chemical lithography processes, for display and other applications in the electronics field. Inkjet technology can be employed to fabricate organic light emitting diodes (OLED), quantum dots displays, and thin-film transistors (TFTs)...... More

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