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Korean J. Met. Mater.
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Korean Journal of Metals and Materials
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압력 센서용 탄소 나노 튜브 폴리머 복합체의 필러 함량과 종횡비에 따른 압저항 특성
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유종찬, 김동영, 이동관, 남건우, 박성훈
Korean J. Met. Mater.
2023;61(10):793-799. Published online 2023 Sep 25
DOI:
https://doi.org/10.3365/KJMM.2023.61.10.793
Abstract
Polymer composites enriched with conductive fillers hold immense potential for flexible pressure sensors, because of the remarkable piezoresistive effect they possess. Research on polymer composite pressure sensors has been actively ongoing because of their flexibility and high electrical resistance performance. This paper presents a comprehensive comparison of the piezoresistive characteristics.....
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L-DED 공정으로 제조된 AISI 316L 스테인리스 스틸의 적층 형상 및 특성에 미치는 공정 변수의 영향
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박지영, 남현지, Qing-Ye Jin, 이욱진
Korean J. Met. Mater.
2023;61(10):760-771. Published online 2023 Sep 25
DOI:
https://doi.org/10.3365/KJMM.2023.61.10.760
Abstract
In this study, AISI 316L stainless steels were manufactured by the L-DED process with various laser scanning speeds and laser powers, in order to analyze how volumetric energy density (VED) can affect their final shape, microstructure and mechanical properties. Under various VED conditions, it was found that a higher VED.....
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Ti-12.1Mo-1Fe 준안정 베타 합금의 변형 거동에 대한 변형률 속도의 영향
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진인경, 이동근
Korean J. Met. Mater.
2023;61(10):741-747. Published online 2023 Sep 25
DOI:
https://doi.org/10.3365/KJMM.2023.61.10.741
Abstract
The addition of expensive elements to β titanium alloys, which are widely used in the aerospace and automobile industries, causes their price to increase. Low-cost, high-strength alloy (Ti-12.1Mo-1.0Fe) was designed in this study and the compressive behaviors of this alloy were evaluated for application to automobile parts, etc. As a.....
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SA508 Gr.4N Ni-Cr-Mo계 고강도 원자로압력용기용 저합금강의 템퍼취화 거동에 미치는 이상영역 열처리의 영향
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홍석민, 이초롱, 이봉상, 김홍덕, 김민철
Korean J. Met. Mater.
2023;61(10):729-740. Published online 2023 Sep 25
DOI:
https://doi.org/10.3365/KJMM.2023.61.10.729
Abstract
To analyze the effects of intercritical heat treatment on the temper embrittlement of SA508 Gr.4N steels, two model alloys with different phosphorus (P) contents were fabricated. Each sample was heat treated by applying a conventional heat treatment process (quenching-tempering) with/without an intercritical heat treatment process (IHT) and a step-cooling heat.....
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산소함량에 따른 Ti-6Al-4V 적층제조 조형체의 미세조직 및 기계적 특성 변화
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강태진, P.L. Narayana, 최성우, 김재혁, 홍재근, 이태경
Korean J. Met. Mater.
2023;61(9):714-720. Published online 2023 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.9.714
Abstract
Titanium alloys are used in many fields including military, aerospace, and biomedical because of their excellent specific strength, corrosion resistance, and biocompatibility. Recently, much research has been focused on addressing the disadvantages of conventional manufacturing methods, including reducing material and energy waste when manufacturing titanium alloy parts by additive manufacturing.....
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채색안료로 사용되는 천연 및 합성 Azurite의 특성 및 안정성 연구
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박주현, 김명남, 박세린, 이선명
Korean J. Met. Mater.
2023;61(9):704-713. Published online 2023 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.9.704
Abstract
Azurite is an inorganic pigment commonly used in traditional painting arts and even today. This pigment has two types: natural azurite and synthetic artificial azurite, called blue verditer or blue bice. Because they have the same structure and similar appearance they are difficult to distinguish. The purpose of this study.....
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Debye-Callaway 모델 기반 Yb(Cd
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열전 합금의 격자 열전도도 분석
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허민수, 권승환, 서원선, 김상일, 김현식
Korean J. Met. Mater.
2023;61(8):608-615. Published online 2023 Jul 24
DOI:
https://doi.org/10.3365/KJMM.2023.61.8.608
Abstract
YbCd
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Korean J. Met. Mater.
2023;61(8):602-607. Published online 2023 Jul 24
DOI:
https://doi.org/10.3365/KJMM.2023.61.8.602
Abstract
Recently, transition metal dichalcogenides (TMDCs) with 2D structure have attracted interest due to their many unique optical and electrical properties. The primary preparation methods for 2D materials are chemical vapor deposition (CVD), exfoliation, and other vacuum technologies. Large-scale synthesis of WS
2
via solution-process is rare due to the higher temperature.....
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열전 복합체 필름을 이용한 스트레쳐블 에너지 하베스팅 소자 개발
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김철민, 박귀일
Korean J. Met. Mater.
2023;61(8):594-601. Published online 2023 Jul 20
DOI:
https://doi.org/10.3365/KJMM.2023.61.8.594
Abstract
Thermoelectric energy harvesting has attracted a lot of attention for powering self-powered devices because of the potential to generate energy anywhere with a temperature difference. In particular, a stretchable thermoelectric generator (S-TEG) can be applied to the repetitively moving parts of a machine and even a human body. Herein, we.....
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전기수력학 젯 기술을 이용한 아연-주석 산화물 박막트랜지스터에서 첨가제에 의한 전기적 특성 향상
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최운섭, 이영직, 김용재
Korean J. Met. Mater.
2023;61(8):589-593. Published online 2023 Jul 24
DOI:
https://doi.org/10.3365/KJMM.2023.61.8.589
Abstract
Oxide thin-film transistors (TFTs) are important semiconductor materials for display backplanes. To fabricate flexible displays, not only display modes but also TFTs are important. Flexible TFTs are especially needed for flexible displays, and related processes need to be developed. Printing is a good choice for the new fabrication of oxide.....
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딥코팅 방법을 활용한 게이트 산화물 유전체 및 반도체 박막의 제조 및 박막트랜지스터 응용
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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
Abstract
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.....
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개질된 COG (coke oven gas)를 이용한 2단 DRI (direct reduced iron) 공정의 공정변수 결정
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고민정, 김수영, 조종오, 이재랑, 김용하, 원용선
Korean J. Met. Mater.
2023;61(8):573-580. Published online 2023 Jul 24
DOI:
https://doi.org/10.3365/KJMM.2023.61.8.573
Abstract
On the road to carbon neutrality, a great deal of attention is being paid to emerging technologies such as the DRI (direct reduced iron) process. This study proposes a two-stage DRI process using reformed COG (coke oven gas), and determined optimal process parameters. The reduction and carbonization of Carajás iron.....
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0
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1
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UNS N07718의 묽은 사워(sour) 모사 용액 내 국부 부식 거동
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이예진, 이준섭, 권순일, 신정호, 조영태, 김석, 이재현
Korean J. Met. Mater.
2023;61(8):553-560. Published online 2023 Jul 24
DOI:
https://doi.org/10.3365/KJMM.2023.61.8.553
Abstract
The localized corrosion behavior of precipitation-hardened UNS N07718 was investigated by immersion tests in 6 wt% FeCl
3
+ 1.0 wt% HCl and the use of electrochemical techniques in a simulating solution of a diluted-sour environment of 25 wt% NaCl + 0.5 wt% CH
3
COOH. The Ti carbides and Nb-Mo carbides with.....
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X-선 회절을 통한 적층제조 A356.2 알루미늄 합금의 잔류응력 분석
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박상철, 김인영, 김영일, 김대겸, 오승주, 이기안, 이빈
Korean J. Met. Mater.
2023;61(7):534-544. Published online 2023 Jun 21
DOI:
https://doi.org/10.3365/KJMM.2023.61.7.534
Abstract
The physical properties of metal-based structural materials, such as hardness, strength and toughness, are directly or indirectly affected by residual stress inside or on the surface of the given part. Repeated rapid heating and cooling during the additive manufacturing process causes thermal gradients and expansion and contraction in the material,.....
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전로 제강 공정에서 초음속 산소 랜스가 2차 연소에 미치는 영향 - 전로 모사 가스 반응로 실험 및 해석
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이지아, 하창수, 한정환
Korean J. Met. Mater.
2023;61(7):514-523. Published online 2023 Jun 21
DOI:
https://doi.org/10.3365/KJMM.2023.61.7.514
Abstract
Employing post-combustion technology in the converter, using the sensible heat of the hot metal and the oxidation reaction heat as a heat source, is known to compensate for insufficient heat in the converter process. However, most studies on post-combustion have been conducted using subsonic nozzles, whereas actual converter processes use.....
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MgO 나노선의 성장과 음극선 발광 특성에 미치는 산소 농도의 영향
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이근형
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
Abstract
MgO nanowires were grown by a thermal evaporation method at different N
2
/O
2
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 1000
o
C and under a pressure of 500Torr. No nanowires were.....
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카본나노튜브/Ecoflex 복합체로 제작된 고신축성 및 고감도 신축성 스트레인 센서
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황보유환, 남현진, 좌성훈
Korean J. Met. Mater.
2023;61(7):500-508. Published online 2023 Jun 21
DOI:
https://doi.org/10.3365/KJMM.2023.61.7.500
Abstract
Wearable strain sensors with high and broad sensitivity, high stretchability and excellent mechanical endurance will be widely useful in smart wearable electronics. In this work, we developed a stretchable strain sensor fabricated with a simple stencil printing technique. The stretchable strain sensor was fabricated using a multi-walled carbon nanotubes (MWCNTs)-Ecoflex.....
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Cited By 1
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ZnO/Cu/Al
2
O
3
구조의 유연 투명 면상발열체 연구
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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
Abstract
In this study, we fabricated transparent heaters composed of an ultrathin Cu-layer heating element sandwiched between a ZnO underlayer and an Al
2
O
3
overlayer. With the Cu layer thickness fixed at 8.5 nm, the thicknesses of the ZnO and Al
2
O
3
layers were independently varied to reach the optimum antireflecting condition (maximum.....
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Al-Si-Mg합금에서 Mg함량과 주조응고 후 냉각속도가 T5 처리시 기계적 특성에 미치는 영향
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손현우, 구태민, 조영희, 이정무
Korean J. Met. Mater.
2023;61(7):472-479. Published online 2023 Jun 21
DOI:
https://doi.org/10.3365/KJMM.2023.61.7.472
Abstract
The effects of Mg content and cooling rate on the T5 treatment of Al-Si-Mg alloys have been investigated using Avrami kinetics and transmission electron microscopy. The alloys were super-heated at 800
o
C for 1 hr followed by degassing treatment at 720
o
C for 15 min, and poured into a metallic.....
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Korean J. Met. Mater.
2023;61(7):459-471. Published online 2023 Jun 21
DOI:
https://doi.org/10.3365/KJMM.2023.61.7.459
Abstract
The degree to which parameters affect the spheroidization heat treatment of steel was calculated by setting the spheroidization heat treatment conditions of Cr-Mo steel and using data analysis such as S/N ratio and ANOVA. After analyzing the transformation temperatures of the steel, A
c1
and A
c3
, using a DSC, the.....
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대기압의 공기 분위기에서 열증발법에 의해 합성된 가지상 구조의 MgO 나노선
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이근형
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
Abstract
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.....
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기계학습을 이용한 색상형 미세조직의 결정립 크기 측정
J
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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
Abstract
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.....
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고전류밀도에서의 탄산칼륨 첨가제의 전해동박 특성에 미치는 영향
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우태규, 박일송
Korean J. Met. Mater.
2023;61(5):347-354. Published online 2023 Apr 20
DOI:
https://doi.org/10.3365/KJMM.2023.61.5.347
Abstract
The amount and kind of additives in electrolytes play a very important role on the electroplating of Cu foil, which is used as a cathode materials for secondary batteries. As the use of Cu foil increased, various studies on the electroplated Cu foil are urgently needed. We studied surface characteristics.....
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2
6
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균질화 AA 2026 합금의 고온 변형과 미세 구조 변화
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K
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강현우, 김수빈, 장병록, 김희국
Korean J. Met. Mater.
2023;61(5):338-346. Published online 2023 Apr 20
DOI:
https://doi.org/10.3365/KJMM.2023.61.5.338
Abstract
AA 2026 is an improved version of AA 2024, an alloy with added Zr to reduce Fe and Si content and inhibit recrystallization during hot working. Al 2026 alloy has high strength and high damage resistance, so it is widely used in aircraft parts. In this study, in order to.....
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황 함량 변화가 NiZnS 복합광촉매의 태양광 물분해 효율에 미치는 영향
J
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김주현, 강은선, 김정현
Korean J. Met. Mater.
2023;61(4):284-290. Published online 2023 Mar 22
DOI:
https://doi.org/10.3365/KJMM.2023.61.4.284
Abstract
Solar energy is attracting much attention as an eco-friendly source for future energy needs. Herein, NiZnS photocatalysts were synthesized with a hydrothermal method at various sulfur contents. The ZnS material is widely used as a photocatalyst because of its high stability, low toxicity, and excellent charge separation characteristics. Nickel is.....
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IN 625 초내열합금의 응고거동 및 상변태 온도 분석
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함성효, 박준호, 조창용, 양승철, 주윤곤, 구지호, 이재현
Korean J. Met. Mater.
2023;61(4):261-268. Published online 2023 Mar 22
DOI:
https://doi.org/10.3365/KJMM.2023.61.4.261
Abstract
The solidification and phase transformation behaviors of IN625 with low C and Fe were investigated through directional solidification and quenching experiments. The primary and secondary dendrite arm spacing decreased exponentially as the solidification rate increased, demonstrating good agreement with theoretical equations. The MC carbide formed at a constant temperature gradient.....
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금속 산화물 지지체를 이용한 산소환원반응에 대한 전기화학 촉매 연구 동향
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조유진, 정원석, 임보영
Korean J. Met. Mater.
2023;61(4):231-241. Published online 2023 Mar 22
DOI:
https://doi.org/10.3365/KJMM.2023.61.4.231
Abstract
Global warming and air pollution have forced greater attention to new energy sources to replace fossil fuels. Among several eco-friendly energy sources, polymer electrolyte membrane fuel cells have been increasingly investigated since they have zero emissions, high energy density, and high energy efficiency. Carbon-supported Pt catalyst is generally used for.....
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YbCd
2-x
Mg
x
Sb
2
열전 합금의 열전 성능 증대 메커니즘 분석
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권승환, 김상일, 허민수, 서원선, 노종욱, 양희선, 김현식
Korean J. Met. Mater.
2023;61(3):198-205. Published online 2023 Feb 24
DOI:
https://doi.org/10.3365/KJMM.2023.61.3.198
Abstract
YbCd
2
Sb
2
is a promising Zintl compound for waste heat recovery applications due to its low thermal conductivity, originating from its complex crystal structure. Many strategies such as alloying or doping have been suggested to further reduce the thermal conductivity of YbCd
2
Sb
2
to improve its thermoelectric performance. However, the.....
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루테늄 기반 전이금속 나노입자/환원된 산화그래핀 혼성체를 이용한 알칼리 수전해 촉매 합성
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이은빈, 조승근, 김상준, 박길령, 이정우
Korean J. Met. Mater.
2023;61(3):190-197. Published online 2023 Feb 24
DOI:
https://doi.org/10.3365/KJMM.2023.61.3.190
Abstract
Green hydrogen has attracted significant attention as one of the future energy sources because no greenhouse gases are emitted during production and its energy density is much higher than fossil fuels. Precious metals such as platinum (Pt) and iridium (Ir)-based catalysts are commonly used for water splitting catalysts. However, because.....
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La
0.7
Sr
0.3
MnO
3
의 합성, 특성 평가 및 전자기파 흡수 특성
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허재희, 강영민
Korean J. Met. Mater.
2023;61(3):183-189. Published online 2023 Feb 24
DOI:
https://doi.org/10.3365/KJMM.2023.61.3.183
Abstract
Perovskite manganese La
0.7
Sr
0.3
MnO
3
(LSMO) powders were prepared by sol-gel synthesis and calcination in the temperature (
T
) range of 500~1200 o C and their structures and electromagnetic (EM) wave absorption properties were investigated. X-ray diffraction (XRD) analysis revealed that the crystalline perovskite phase can be formed at
T
≥ 600
o
C......
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