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Korean J. Met. Mater.
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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
Abstract
: 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.....
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폐리튬배터리(LIBs)에서 유가금속(Ni, Co, Mn, Li) 회수 시 발생하는 황산나트륨의 처리 및 회수 연구
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조연철, 서민혁, 이영재, 안재우
Korean J. Met. Mater.
2024;62(4):275-283. Published online 2024 Mar 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.4.275
Abstract
Concerns have arisen regarding the high concentrations of sodium sulfate in wastewater resulting from the waste Li-ion battery wet recycling process. In addressing this issue, Bipolar electrodialysis was employed to desalinate high-concentration sodium sulfate and recover it as sulfuric acid and sodium hydroxide. The investigation encompassed various experimental variables, such.....
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IN792 초내열 합금의 고온 산화 거동에 미치는 결정립 크기의 영향
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방지예, 이동현, 이수열
Korean J. Met. Mater.
2024;62(4):267-274. Published online 2024 Mar 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.4.267
Abstract
It is known that Ni-based superalloys possess superior mechanical properties in high-temperature and high-pressure environments. One of the drawbacks of these alloys is their tendency to oxidize at high temperatures. Improving their oxidation properties and obtaining a fundamental understanding of the underlying mechanism of their oxidation behavior are critical for.....
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Twin wire arc spray 공정을 통해 제작된 Al-Al
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복합소재 미끄럼 방지 코팅의 우수한 마모 저항성
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권한솔, 박영진, 강용진, 김도현, 남욱희, 변응선
Korean J. Met. Mater.
2024;62(4):257-266. Published online 2024 Mar 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.4.257
Abstract
In this study, novel non-skid Al-Al
2
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coatings with improved wear resistance were fabricated using twin wire arc spray (TWAS). TWAS Al coating was prepared as a reference sample and representative TWAS parameters (working distance, process gas pressure, arc current) were controlled to fabricate different Al-Al
2
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coatings. The Al-Al
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coatings showed.....
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유연 압저항 센서에 적용되는 나노 소재 및 구조 설계에 대한 최신 연구 동향
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강여울, 이정우
Korean J. Met. Mater.
2024;62(3):239-249. Published online 2024 Feb 28
DOI:
https://doi.org/10.3365/KJMM.2024.62.3.239
Abstract
This review provides an overview of recent advances in the materials and structural design of flexible piezoresistive sensors, which are of significant interest as smart devices in the Fourth Industrial Revolution. Recent research has focused on addressing demand for a wide pressure range and high sensitivity for use in diverse.....
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계면 스위칭 멤리스터 소자 구조와 신경망 회로 성능에 대한 시뮬레이션 연구
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송윤혁, 임지민, Sagar Khot, 정동명, 권용우
Korean J. Met. Mater.
2024;62(3):212-221. Published online 2024 Feb 28
DOI:
https://doi.org/10.3365/KJMM.2024.62.3.212
Abstract
In this study, the architecture of an interfacial switching memristor, which has a metal-insulatormetal structure of Pt/SrTiO
3
/Nb-SrTiO
3
was investigated. The performance of a neural network that uses memristors as its synapse components was also examined with system-level simulations. A finite element solver, COMSOL Multiphysics, was used to simulate synaptic device.....
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고신뢰성 적층 세라믹 커패시터를 위한 침식방지형 주석도금액 개발
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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
Abstract
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.....
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Er 합금 원소 첨가를 통한 인장 물성과 절삭성이 우수한 Ti 합금 개발
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최이슬, 오정목, 박찬희, 이욱진, 박용호, 원종우
Korean J. Met. Mater.
2024;62(3):171-179. Published online 2024 Mar 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.3.171
Abstract
This study demonstrates that the addition of the rare earth element Erbium (Er) significantly enhances the machinability and tensile properties of titanium (Ti). Pure Ti alloys and Er-added Ti alloys with 0.5-1.1 wt.% Er content were prepared, and their microstructure, machinability, and tensile properties were compared. Two different types of.....
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고에너지 볼 밀링을 이용한 분산강화된 Fe-TaC 합금분말의 소결거동 및 기계적 특성평가
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박범순, 이정한, 박재철, 홍성길, 박현국
Korean J. Met. Mater.
2024;62(3):163-170. Published online 2024 Feb 28
DOI:
https://doi.org/10.3365/KJMM.2024.62.3.163
Abstract
In this study, a high-melting point element, tantalum carbide (TaC) was added to improve the mechanical properties and the oxidation/corrosion resistance of Fe. The Fe-TaC composites were synthesized by high energy ball milling for the mechanical alloying of the non-equilibrium phase (Fe-Ta) and the homogeneous dispersion of TaC. Fe-TaC composite.....
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반데르발스 소재 기반의 태양전지 적용에 관한 최신 연구동향 리뷰
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박형기, 이재현, 허근
Korean J. Met. Mater.
2024;62(2):154-161. Published online 2024 Jan 30
DOI:
https://doi.org/10.3365/KJMM.2024.62.2.154
Abstract
In recent years, the exploration of van der Waals materials has taken center stage in the field of advanced materials research. Studies have delved deeply into the multifaceted characteristics of these materials, and in particular their potential applications in solar cell technology. Van der Waals materials, named after the unique.....
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금속산화물 나노구조체를 이용한 화학저항식 가스센서의 최신 연구동향
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고재권, 박인혁, 심영석, 홍구택, 권기창
Korean J. Met. Mater.
2024;62(2):142-153. Published online 2024 Jan 30
DOI:
https://doi.org/10.3365/KJMM.2024.62.2.142
Abstract
In the modern era, advanced industrial and process technologies in various fields are known to produce harmful gases. These gases typically leak at low concentrations, but continuous exposure can cause serious harm to health and safety. Since human sensory organs cannot detect these risks or leaking hazardous gases, there has.....
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Al-Mg-Si-Cu-Mn 합금 압출재의 미세조직 및 기계적 성질에 미치는 용체화 온도와 퀜칭 지연의 영향
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김지수, 정제기, 천현석, 김병주, 임차용, 김수현, 최윤석
Korean J. Met. Mater.
2024;62(2):132-141. Published online 2024 Jan 30
DOI:
https://doi.org/10.3365/KJMM.2024.62.2.132
Abstract
The effect of solution temperature and quench delay on the microstructure and mechanical properties of an extruded Al-Mg-Si-Cu-Mn alloy was investigated by employing differential scanning calorimetry, transmission electron microscopy, hardness test, and tensile test. The extruded specimens were held at 500 and 540
o
C, respectively, for 80 min for solutionizing.....
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Ti-xMo-2Fe 베타계 타이타늄 합금의 기계적 특성 및 부식 특성에 미치는 Mo의 영향 평가
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박정연, 이재관, 이용재, 이동근
Korean J. Met. Mater.
2024;62(2):125-131. Published online 2024 Jan 30
DOI:
https://doi.org/10.3365/KJMM.2024.62.2.125
Abstract
Titanium alloys are currently used in offshore industries. The titanium alloys used in offshore plants need to have excellent corrosion resistance and mechanical properties because offshore plants are exposed to harsh corrosive environments. At this time, the Ti-6Al-4V ELI alloy is mainly used in offshore plants because it has excellent.....
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Ni-Fe bimetallic oxides 촉매의 CO, NO 가스상 오염물질 동시저감 특성
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김운기, 정재일, 이명진, 정보라, 예보라, 이희수, 김홍대
Korean J. Met. Mater.
2024;62(2):115-124. Published online 2024 Jan 30
DOI:
https://doi.org/10.3365/KJMM.2024.62.2.115
Abstract
Many studies have been conducted on methods to remove air pollutants. Among them, a representative commercial technology for reducing nitrogen oxides (NO
X
) is selective catalytic reduction (SCR) using NH
3
as a reductant. However, the NH
3
-SCR technology has problems, such as the need for additional NH
3
gas (Active-SCR), the fact that.....
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Korean J. Met. Mater.
2024;62(2):106-114. Published online 2024 Jan 30
DOI:
https://doi.org/10.3365/KJMM.2024.62.2.106
Abstract
This research elucidates the intricate interplay of lithium content, oxygen pressure, and temperature and their influence on the electrical properties of Lithium-doped zinc oxide (LZO). The electrical behavior of zinc oxide (ZnO), a prominent semiconductor material, can be modulated when doped with lithium (Li). Through systematic experimentation, we demonstrate that.....
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회귀기반의 동적재료모델을 이용한 Inconel 718 합금의 고온 변형 거동 분석 및 Ring rolling 공정의 적용
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양선영, 박진욱, 윤준석, 이광석, 이동근, 신다슬
Korean J. Met. Mater.
2024;62(2):81-93. Published online 2024 Jan 30
DOI:
https://doi.org/10.3365/KJMM.2024.62.2.81
Abstract
Inconel 718 nickel-based alloy is extensively used in the aerospace industry (e.g., gas turbine engine components) because of its excellent corrosion resistance and high mechanical properties at elevated temperatures. However, there is a certain limit to manufacturing the alloy through plastic deformation due to its high deformation resistance and complicated.....
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SS304L 표면 오염물질 제거를 위한 고출력 레이저 클리닝 영향 분석
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최수진, 유현종, 최지연, 노지환, 강희신, 안상훈, 박준수, 최필공, 김도현, 김영규, 김병주, 전익근, 김정오, 손현기, 김경한, 박창규
Korean J. Met. Mater.
2024;62(2):73-80. Published online 2024 Jan 30
DOI:
https://doi.org/10.3365/KJMM.2024.62.2.73
Abstract
In this study, artificially formed corrosion and paint layers on 304L stainless steel (SS304L) specimen were removed using a kilowatt level high-power Nd:YAG laser. A laser power of 1140 W and a pulse duration of 89 ns were used for the corrosion removal, and a laser power of 850 W.....
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Korean J. Met. Mater.
2024;62(1):57-64. Published online 2023 Dec 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.1.57
Abstract
Carbon fiber reinforced polymer (CFRP) has been extensively used in civil engineering for applications such as reinforcing and retrofitting various architectural materials. Therefore, understanding the degradation of CFRP under high temperatures is important. This study aims to investigate the thermomechanical and microstructural properties of CFRP plates at elevated temperatures up.....
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Ni-based 초내열합금의 미세조직, 인장특성, δ 석출상에 미치는 열처리 온도의 영향
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송전영, 구지호, 신종호, 조원희, 이초현, 설재복, 마영화
Korean J. Met. Mater.
2024;62(1):32-38. Published online 2023 Dec 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.1.32
Abstract
Here, we investigated the influence of δ-precipitate (orthorhombic D0a Ni
3
Nb-ordered phase) on the room- and high-temperature tensile properties in wrought nickel-based Inconel 625 superalloys subjected to solution and aging heat treatment. Typically, solution heat-treatment temperatures in these alloys affect the solid-state precipitation of δ-phase, which governs high-temperature tensile properties. While.....
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파워 소자의 고속 다이 접합을 위한 5 um Cu@Sn 입자 기반 프리폼의 천이액상 소결접합 특성
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한병조, 조상호, 전강록, 이종현
Korean J. Met. Mater.
2024;62(1):12-21. Published online 2023 Dec 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.1.12
Abstract
To ensure the high-temperature stability of a bondline under next-generation power devices such as SiC semiconductors, a die bonding test was performed by transient liquid-phase (TLP) sinter-bonding using a Sn-coated Cu (Cu@Sn) particle-based preform. Compared to the existing 20 min-bonding result using a 30 μm Cu@Sn particle-based preform, a 5.....
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알루미늄 5052-H32 합금과 6014-T4 합금의 저항 점 용접 시 용접성 및 미세조직 비교
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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
Abstract
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.....
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이중 인공지능을 이용한 Al 7075 합금에서의 압광 균열 진단 연구
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박태오, 신윤우, 이승환, 좌비오, 권용남, Suman Timilsina, 장성민, 조철우, 김지식
Korean J. Met. Mater.
2023;61(12):958-964. Published online 2023 Nov 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.12.958
Abstract
The phenomenon of mechanoluminescence (ML) refers to the emission of light induced by mechanical stimulation applied to mechano-optical materials for example SrAl
2
O
3
:Eu,Dy (SAO). Numerous technologies on the basis of ML have been presented to visualize the stress or strain in various structures for the applications including structural health monitoring. As.....
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브레이크 마찰재의 마찰특성에 미치는 부식 환경의 영향
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신희섭, 김율구, 이상목
Korean J. Met. Mater.
2023;61(12):943-950. Published online 2023 Nov 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.12.943
Abstract
The friction properties of brake friction materials are investigated utilizing the different car cleaners. Water, wheel cleaner and tire dressing were used to designate driving conditions in the field. The friction materials were soaked in each solution before friction test. The Coefficient of friction (COF) was similar in the case.....
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WC-20wt%Co 초경 합금의 미세 조직 변화에 따른 인장 및 피로 성질
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조규섭, 김경일, 노우람
Korean J. Met. Mater.
2023;61(12):933-942. Published online 2023 Nov 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.12.933
Abstract
WC-Co cemented carbide has excellent mechanical properties and is widely used in many industrial applications including cold forging dies and cutting tools. The tensile and fatigue properties of WC-20wt%Co cemented carbides with microstructural variations were investigated. Microstructure parameters such as Co binder content, WC particle size, binder mean free path,.....
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Zn-ion 배터리용 ZnMn
2
O
4
양극재의 입자 크기 증가를 통한 Mn
3+
용출 완화로 수명 증가
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박재영, 최영묵, 전상은
Korean J. Met. Mater.
2023;61(12):923-932. Published online 2023 Nov 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.12.923
Abstract
ZnMn
2
O
4
(ZMO) cathode possesses a high theoretical capacity of 224 mAh g
-1
and high operating voltage (1.9 V vs. Zn
2+
/Zn) for aqueous Zn–ion batteries. However, the disproportionation reaction of Mn
3+
leads to Mn dissolution in the ZMO cathode, deteriorating lifespan. In this study, we attempted to reduce Mn dissolution by.....
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Bi 도핑에 따른 SnTe의 상온 최대 열전성능지수 예측
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이준하, 박현진, 김정연, 서원선, 양희선, Umut Aydemir, 김세윤, 신원호, 김현식
Korean J. Met. Mater.
2023;61(12):915-922. Published online 2023 Nov 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.12.915
Abstract
SnTe has drawn much attention due to its Pb-free composition along with tunable electronic and lattice structures. However, its intrinsically high defect concentration and high lattice thermal conductivity (
κ
1
) have hindered its application in devices. Recently, Bi doping at Sn-sites in Sn
1-
x
Bi
x
Te (
x
= 0.0 – 0.08) has been demonstrated.....
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Sputtering공정 적용 Ag-Ti 조성경사형 박막의 구조분석
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전용민, 유시홍, 김민준, 이성의
Korean J. Met. Mater.
2023;61(12):909-914. Published online 2023 Nov 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.12.909
Abstract
In this study, a composition-gradient thin film was applied for the formation of intermediate layer of Ti seed layer for an stable electrode stack Ag metal layer. Various composition of Ag-Ti hetero metal layer were simultaneously deposited by using the sputtering process with Ti and Ag target, respectively. An intermediate.....
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API 강재에 첨가된 미량의 합금원소(Cr, Mo)가 CO
2
포화염수 환경 내 부식거동에 미치는 영향
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윤덕빈, 방혜린, 김완근, 김성진
Korean J. Met. Mater.
2023;61(12):896-908. Published online 2023 Nov 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.12.896
Abstract
This study examined the effects of minor alloying elements (Cr and Mo) on the corrosion behaviors of API grade steel in CO
2
-saturated near-neutral aqueous solutions. Various experimental and analytical methods were applied to gain insights into the underlying CO
2
corrosion mechanism of the steels. The findings revealed that steel with.....
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염수환경 내 해드필드강 용접열영향부의 부식 및 침식-부식 거동에 미치는 Cr 첨가의 영향
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진승우, 박진성, 윤덕빈, 이상철, 최종교, 오민석, 김성진
Korean J. Met. Mater.
2023;61(12):883-895. Published online 2023 Nov 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.12.883
Abstract
The corrosion and erosion-corrosion behaviors in the weld heat-affected zone (HAZ) of Hadfield steels with varying Cr contents (1, 2, and 3 wt%) were examined. Various experimental methods, including electrochemical polarization, impedance, and weight loss measurements, were utilized. Two types of isothermal heat treatments were conducted in a box furnace.....
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설명 가능한 인공지능으로 해석한 Al-Sc-X 합금의 경도 예측 기계학습 모델과 역설계
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박지원, 김수현, 김지수, 김병주, 천현석, 오창석
Korean J. Met. Mater.
2023;61(11):874-882. Published online 2023 Oct 29
DOI:
https://doi.org/10.3365/KJMM.2023.61.11.874
Abstract
In this study, the Vickers hardness of precipitation-strengthened Al-Sc-X (X = Zr, Si, and Fe) alloys were predicted using machine learning models, depending on the alloys’ compositions, solid-solution treatment and aging conditions. The data used for machine learning were collected from the literature. Among the models, tree-based ensemble models such.....
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