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Bandgap Reduction and Enhanced Photoelectrochemical Water Electrolysis of Sulfur-doped CuBi<sub>2</sub>O<sub>4</sub> Photocathode
Eunhwa Kim, Sanghan Lee, Sangwoo Ryu
Korean J. Met. Mater. 2023;61(2):115-119.   Published online 2023 Jan 27
DOI: https://doi.org/10.3365/KJMM.2023.61.2.115

Abstract
As interest in hydrogen energy grows, eco-friendly methods of producing hydrogen are being explored. CuBi2O4 is one of the p-type semiconductor cathode materials that can be used for photoelectrochemical hydrogen production via environment-friendly water electrolysis. CuBi2O4 has a bandgap of 1.5 – 1.8 eV which allows it to photogenerate electrons..... More

      
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

Abstract
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

                        
Discrepancies in Nanoindentation Hardness and Modulus with a Berkovich, a Cube-corner, and a Conical Tip in a Cu(In,Ga)Se<sub>2</sub> Light-Absorption Layer
Berkovich 압자와 Cube-corner 및 Conical shape 압자를 이용해서 얻은 Cu(In,Ga)Se2 광흡수층 박막의 탄성계수 및 경도의 불일치에 대한 고찰
Yeojin Kang, Wonjung Park, Mao Zhang, Dayoung Yoo, Dongyun Lee
강여진, 박원정, 장마오, 유다영, 이동윤
Korean J. Met. Mater. 2022;60(12):884-891.   Published online 2022 Nov 25
DOI: https://doi.org/10.3365/KJMM.2022.60.12.884

Abstract
In this study, we tried to understand the difference in the mechanical properties (elastic modulus, E & hardness, H) values of CIGS compound semiconductors measured using the Berkovich indenter and the sharper cube corner and conical indenter. Adopted continuous stiffness measurement technique to characterize it along with the indentation depth...... More

                        
Recovery of Palladium Metal with High Purity by Selective Reduction from Inorganic Acid Leaching Solutions of Cemented Zinc
아연치환체의 무기산 침출액에서 선택적 환원에 의한 고순도 팔라듐금속의 회수
Si Jeong Song, Viet Nhan Hoa Nguyen, Man Seung Lee
송시정, Viet Nhan Hoa Nguyen, 이만승
Korean J. Met. Mater. 2022;60(11):837-844.   Published online 2022 Oct 31
DOI: https://doi.org/10.3365/KJMM.2022.60.11.837

Abstract
A small amount of Pd(II) present in spent electroplating solutions is concentrated by cementation. In this work, a process was developed to recover pure palladium metal by selective reduction from the hydrochloric and the sulfuric acid leaching solutions of cemented zinc. For this purpose, hydrazine and ascorbic acid were employed..... More

                        
An Optimization of Manufacturing Process of SS304L Using Direct Energy Deposition Method
DED 공정에서의 SS304L 적층 조건 최적화
Sung Eun Kim, Sung Chan Yoo, Hyun-Gil Kim
김성은, 유승찬, 김현길
Korean J. Met. Mater. 2022;60(11):819-826.   Published online 2022 Oct 31
DOI: https://doi.org/10.3365/KJMM.2022.60.11.819

Abstract
The direct energy deposition (DED) method is an emerging manufacturing technique that has been recently highlighted due to its capabilities to coat materials with complex geometry for high temperature and highly corrosive environmental applications, such as steam turbine blade. Amongst metallic materials, SS304L has been reported to have superior corrosion..... More

                        
Comparative Analysis of Microstructure and Collision Performance of TWB Hot Stamped Parts with Various Strength Combinations
강도조합에 따른 TWB 핫스탬핑 부품의 미세구조 및 충돌성능 비교 분석
Chang Wook Lee, Yeonjung Hwang, Uk Heo, Byung Gil Yoo, Ji Hong Yoo, Taejeong Kim, Kwang Min Yoon
이창욱, 황연정, 허욱, 유병길, 유지홍, 김태정, 윤광민
Korean J. Met. Mater. 2022;60(11):801-810.   Published online 2022 Oct 31
DOI: https://doi.org/10.3365/KJMM.2022.60.11.801

Abstract
Hot stamping technology has been steadily developed because it provides both excellent formability and high strength. With the development of TWB hot stamping technology, it is now possible to freely apply the required strength and thickness in the right place. In this study, the microstructure and collision performance of TWB..... More

                        
Effects of Fillers on the Hydration Behaviors of Tricalcium Silicate Scaffolds Fabricated by Fused Deposition Modeling
Yeongjin Koo, Yoonjoo Lee, Myung-Hyun Lee, Seog Young Yoon
구영진, 이윤주, 이명현, 윤석영
Korean J. Met. Mater. 2022;60(9):685-693.   Published online 2022 Aug 30
DOI: https://doi.org/10.3365/KJMM.2022.60.9.685

Abstract
With the development of additive manufacturing technology, many types of materials are being utilized, and methods of printing the materials and characteristics of their hydration properties are being studied in the fields of construction and biotechnology. Tricalcium silicate (C3S), which is used as a cement material or biomaterial, is a..... More

                        
Optimization of Holographic Imprinting Process for Metallic Glass using Thermoplastic Forming
열가소성 성형을 이용한 비정질 합금의 홀로그램 임프린팅 공정 최적화
Wook Ha Ryu, Chae Woo Ryu, Kyung Jun Kim, Min Kyung Kwak, Eun Soo Park
류욱하, 류채우, 김경준, 곽민경, 박은수
Korean J. Met. Mater. 2022;60(9):644-653.   Published online 2022 Aug 30
DOI: https://doi.org/10.3365/KJMM.2022.60.9.644

Abstract
The thermoplastic forming (TPF) process of metallic glass (MG) is a unique and powerful method that cannot be performed using conventional crystalline alloys. Because the mechanical and thermal properties of MGs are more favorable with smaller sample sizes, TPF is particularly useful for microscale and nanoscale part molding and micro-patterning...... More

                        
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

Abstract
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

Abstract
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
이동욱
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

                           Cited By 1
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

Abstract
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

Abstract
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

Abstract
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

                           Cited By 2
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

Abstract
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 2
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

                           Cited By 2
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

                        
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