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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. CuBi
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O
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is one of the p-type semiconductor cathode materials that can be used for photoelectrochemical hydrogen production via environment-friendly water electrolysis. CuBi
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O
4
has a bandgap of 1.5 – 1.8 eV which allows it to photogenerate electrons.....
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연속주조 스테인리스강 슬라브의 결정립 조직 예측
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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).....
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Berkovich 압자와 Cube-corner 및 Conical shape 압자를 이용해서 얻은 Cu(In,Ga)Se
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광흡수층 박막의 탄성계수 및 경도의 불일치에 대한 고찰
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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......
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아연치환체의 무기산 침출액에서 선택적 환원에 의한 고순도 팔라듐금속의 회수
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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.....
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DED 공정에서의 SS304L 적층 조건 최적화
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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.....
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강도조합에 따른 TWB 핫스탬핑 부품의 미세구조 및 충돌성능 비교 분석
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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.....
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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.....
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열가소성 성형을 이용한 비정질 합금의 홀로그램 임프린팅 공정 최적화
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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......
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Li 도핑에 따른 CuO 광전극의 광전기화학적 특성 개선 연구
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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.....
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성에 제거용 대면적 투명 히터를 위한 환원된 산화 그래핀 연구
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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.....
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벌크 다결정 SnS / PEDOT:PSS 박막 이중층에서의 변조 도핑을 통한 열전 역률 강화
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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.....
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Ba-Sr-Co-Fe 산화물과 La-Sr-Mn 산화물 양극을 포함하는 Ni-Fe 기반 금속지지형 고체산화물 연료전지의 전기화학적 성능
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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.....
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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,.....
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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 NH
4
OH/H
2
O diluted with ethanol, for the continuous synthesis of the silica suspension. The.....
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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 Cu
3
SbS
4
(famatinite) and Cu
3
SbSe
4
(permingeatite). In this study, solid solutions of Cu
3
SbS
4-y
Se
y
(y.....
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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.....
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박판주조법으로 제조한 Al-8Zn-2.5Mg-xCu 합금 판재의 미세조직에 미치는 Cu의 영향
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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.....
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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.....
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Cited By 1
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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.....
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진공 원심 주조된 Ti-6Al-4V 합금의 주조 및 열처리에 따른 미세조직과 기계적 특성
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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.....
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Cited By 1
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도금폐액에 함유된 팔라듐의 아연치환물 염산침출액에서 상용화추출제를 이용한 용매추출로 팔라듐(II)과 아연(II)의 분리
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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.....
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Cited By 2
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황산용액에서 상용화 추출제에 의한 팔라듐(II)과 아연(II)의 분리
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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).....
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Cited By 2
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슈퍼듀플렉스 스테인리스강의 반복 수정용접이 기계적 물성과 공식저항성에 미치는 영향
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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.....
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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.....
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슈퍼커패시터 전극 제조시 Indium-Tin-Oxide기판 위 활성탄 증착에 적합한 바인더와 용매 소재
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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......
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Al-Si 도금된 핫스탬핑 보론강의 볼트 프로젝션 용접시 예열 통전이 용융 거동에 미치는 영향
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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.....
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Cited By 2
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열보조 나노 전사 프린팅을 통한 금속 박막의 표면 주름 나노패턴 형성 방법
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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,.....
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Twin-Roll Strip Casting 공정으로 제조된 Al 7075 합금의 미세조직 및 마모 특성
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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.....
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Cited By 1
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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.....
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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.....
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