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Sn 조성 변화가 Cu-Sn 브레이징 접합부의 응고조직과 균열에 미치는 영향
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문병록, 유성훈, 이병휘, 홍원식, 정진욱, 강남현
Korean J. Met. Mater.
2025;63(5):370-379. Published online 2025 May 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.5.370
Abstract
Solidification cracking in brazed joints is significantly influenced by solidification conditions and alloy composition, making it a critical factor for the reliability of parts and products. Numerous studies have been conducted to predict solidification cracking in processes like casting, welding, and joining, leading to the development of an index to.....
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그린레이저를 이용한 리튬 이온 배터리 버스바 용접부의 응고균열과 성분 분포 상관관계
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유예지, Jeong-Hoi Koo, 강희신, 천은준
Korean J. Met. Mater.
2025;63(5):356-369. Published online 2025 May 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.5.356
Abstract
This study investigates the solidification cracking susceptibility of Cu-Steel laser welds used for cylindrical lithium-ion battery busbars. The research utilized green laser technology with three distinct beam patterns: Linear, Spiral + Wobble, and Circular + Wobble. Additionally, Ni-P coating layers of varying thicknesses (10, 50, 100 μm) were applied to.....
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AZ31, Al5052, Cu 미세조직이 전자파 차폐 효과에 미치는 영향
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김경택, 김성제, 강민혁, 이상봉
Korean J. Met. Mater.
2025;63(3):224-230. Published online 2025 Mar 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.3.224
Abstract
With the widespread use of electronic devices in the telecommunications industry, exposure to electromagnetic waves has largely increased in the last decades. In addition to concerns about heath issues caused by an accumulative exposure to electromagnetic waves, electromagnetic interference causes malfunctions in complex electronic devices and degrades signal quality. The.....
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Korean J. Met. Mater.
2025;63(3):186-196. Published online 2025 Mar 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.3.186
Abstract
This study examines the influence of ZrO
2
on austenitic stainless steel 316 (ASS 316). Following the addition of varying weight percentages (0, 1, 2, and 3) of ZrO
2
to ASS 316 powder, the samples were ball-milled for a duration of 30 h and then subjected to vacuum hot-pressing (VHP) for.....
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구리 및 구리 합금의 산화 거동에 미치는 기압의 영향
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박준상, 김두원, 정일석, 최은애, 권세훈, 한승전
Korean J. Met. Mater.
2025;63(2):85-94. Published online 2025 Feb 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.2.85
Abstract
This study investigated the effect of gas pressure and alloying elements on the oxidation behavior of copper. Copper alloys containing 1 wt.% of zinc, nickel, or manganese were cast using vacuum induction melting, followed by solution treatment at 400°C for 60 minutes. Oxidation were conducted at 700°C for 60 minutes.....
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직교 가공 시험법을 이용한 내열 Ta-W 합금 절삭 가공 최적화 연구
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김규식, 김신원, 문창현, 박정효, 김동훈, 양성호, 박형욱
Korean J. Met. Mater.
2025;63(1):23-32. Published online 2025 Jan 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.1.23
Abstract
Tantalum and tantalum alloys, which have superior thermal properties, including a high melting temperature, low specific heat, low thermal conductivity, and high density, are promising candidates for highperformance parts exposed to high temperatures and hazardous environments in aerospace, defense, and other industries. However, those alloys are hard to cut and.....
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슈퍼커패시터 전극 활용을 위한 Polyvinylidene Chloride-resin으로부터 CuO와 Tetrahydrofuran을 이용해 합성된 친수성 다공성 탄소의 율속 특성 향상
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홍이진, 전상은
Korean J. Met. Mater.
2024;62(12):981-988. Published online 2024 Nov 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.12.981
Abstract
Carbon materials used as an electrode for aqueous supercapacitors should be synthesized with a porous structure and hydrophilic properties to facilitate the adsorption and desorption of electrolyte ions for charge storage. To enlarge the specific surface area, the porous morphology should contain micropores (diameter < 2 nm). Mesopores (diameter: 2.....
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MLCC용 Ni 나노파우더의 소결 억제를 위한 W 나노파우더 첨가의 효과
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이준운, 민건식, 이성민, 안영규, 한흥남
Korean J. Met. Mater.
2024;62(10):777-786. Published online 2024 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.10.777
Abstract
Multilayer ceramic capacitors (MLCCs) are essential fundamental components in electronic devices, enabling miniaturization and high capacitance for energy storage and filtering. A key focus in MLCC research is enhancing capacitance density, for which improving the connectivity of Ni internal electrodes is imperative. The primary cause of reduced electrode connectivity in.....
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Korean J. Met. Mater.
2000;62(8):631-638. Published online 2024 Jul 31
DOI:
https://doi.org/10.3365/KJMM.2024.62.8.631
Abstract
Nitrogen dioxide (NO
2
) is a highly dangerous gas, mostly emitting emitted from fossil fuels, and a major contributor to air pollution. It has negatively effects affects on the human health as well asand contributes to environmental issues like acid rain. In this study, mesoporous CuO
x
nanoparticles (NPs) were successfully synthesized.....
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Cu 도핑 및 Electric Current Pulse 공정에 의한 Bi-Sb-Te계 열전소재의 최대 열전성능지수 예측
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이준하, 박현진, 김준수, 서원선, 김상일, 김현식
Korean J. Met. Mater.
2024;62(7):550-557. Published online 2024 Jun 28
DOI:
https://doi.org/10.3365/KJMM.2024.62.7.550
Abstract
Bi
2
Te
3
shows high thermoelectric performance near room temperature, making it the most widely used material in thermoelectric cooling applications. Cu doping has been found to be effective in improving the thermoelectric performance of Bi
2
Te
3
. However, due to the problem of easy migration of Cu ions, the stability of Cu-doped Bi
2
Te
3
.....
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리튬이온 배터리용 Cu-Steel 이종 레이저 용접부 응고균열에 미치는 Ni-P 도금의 영향
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박재현, 김명진, 강희신, 천은준
Korean J. Met. Mater.
2024;62(7):503-510. Published online 2024 Jun 28
DOI:
https://doi.org/10.3365/KJMM.2024.62.7.503
Abstract
This study investigated the effect of a Ni-P coating layer on the solidification cracking behavior of Cu–mild steel dissimilar welds during the manufacturing of cylindrical Li-ion battery packs for electric vehicles. Four Cu plates were prepared and characterized: uncoated Cu and three levels (12, 50, and 100 μm) of Ni–P-coated.....
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시작물질 농도 제어에 따른 Cu
3
SbSe
4
열전소재의 최대 열전성능지수 예측
M
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이민규, 황성미, 김세준, 서원선, 김상일, 김현식
Korean J. Met. Mater.
2024;62(6):487-493. Published online 2024 May 31
DOI:
https://doi.org/10.3365/KJMM.2024.62.6.487
Abstract
Cu
3
SbSe
4
is considered a promising thermoelectric material because of its large effective mass and low thermal conductivity, originating from its unique lattice structure. However, Cu
3
SbSe
4
has intrinsically low carrier concentration and relatively high electric resistance which limit performance. Recently, a
zT
improvement in Cu
3
SbSe
4
was reported where doping/precipitation is controlled.....
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방전플라즈마소결법을 이용한 구리-흑연 재료의 소결거동 및 열적 특성 평가
M
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양민혁, 박범순, 문형석, 박재철, 박현국
Korean J. Met. Mater.
2024;62(6):411-418. Published online 2024 May 31
DOI:
https://doi.org/10.3365/KJMM.2024.62.6.411
Abstract
The use of heat dissipation materials in various field such as power semiconductor device, LED and microelectronic system. Therefore, there is a need for heat dissipation materials using copper (Cu) and graphite (Gr). These materials have high thermal conductivity. In particular, graphite has high thermal stability with a low coefficient.....
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Web of Science 1
Crossref 1
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Korean J. Met. Mater.
2024;62(5):360-366. Published online 2024 May 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.5.360
Abstract
A Cu-based paste containing Cu formate and Cu particles was prepared for the compressionassisted sinter-bonding of Cu-finished wide-bandgap power devices onto a Cu-finished substrate at a relatively low bonding temperature of 250 oC in air. A mixture of Cu formate and Cu particles was designed to mitigate the tremendous volume.....
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금속산화물 분말의 수소환원에 의한 W-Ni-Cu 합금분말의 합성
Y
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허연지, 이의선, 최지원, 변종민, 오승탁
Korean J. Met. Mater.
2024;62(5):334-339. Published online 2024 May 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.5.334
Abstract
The effect of powder processing on the microstructure and sinterability of the heavy alloy W-Ni-Cu was investigated. The heavy alloy powders were prepared by the ball milling and hydrogen reduction of metal oxide powders. As the milling time increased, the size of the powder mixture decreased and at 5 h.....
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Korean J. Met. Mater.
2024;62(4):299-305. Published online 2024 Mar 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.4.299
Abstract
To improve the hydrogen-storage properties of Mg
2
Ni, LiBH
4
was added by milling in hydrogen atmosphere (reactive mechanical milling, RMM). Mg
2
Ni-10LiBH
4
was prepared with a composition of 90 wt% Mg
2
Ni + 10 wt% LiBH
4
. The quantity of released hydrogen (H
r
) versus temperature T curve for Mg
2
Ni10LiBH
4
was obtained by heating at.....
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Web of Science 1
Crossref 1
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진공 브레이징을 통해 제조한 TiAl/HI-TEMP 820/SCM440H 재료의 공정 온도에 따른 미세조직 및 기계적 특성 평가
S
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유상규, 김지원, 이초롱, 오명훈, 최인철
Korean J. Met. Mater.
2024;62(3):229-238. Published online 2024 Feb 28
DOI:
https://doi.org/10.3365/KJMM.2024.62.3.229
Abstract
The TiAl alloy is attracting attention as a lightweight and heat-resistant material, because of its high specific strength, excellent high-temperature formability, and fatigue strength. However, its applications are limited by its high unit price and low room temperature ductility. To overcome this issue, dissimilarly bonded materials have been extensively employed......
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Web of Science 1
Crossref 1
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Al-Mg-Si-Cu-Mn 합금 압출재의 미세조직 및 기계적 성질에 미치는 용체화 온도와 퀜칭 지연의 영향
J
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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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Web of Science 1
Crossref 1
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p/n PbSe 다이오드의 제조 및 전기적 특성 평가
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b
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황보석호, 이제원
Korean J. Met. Mater.
2024;62(2):94-105. Published online 2024 Jan 30
DOI:
https://doi.org/10.3365/KJMM.2024.62.2.94
Abstract
Lead selenide (PbSe) diodes were fabricated using a magnetron sputtering process system with a pulsed DC power supply and a 2-inch PbSe target with a purity of 5N. For p-type PbSe thin films, the process variable was the oxygen ratio in the mixed gas of argon and oxygen. The electrical.....
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파워 소자의 고속 다이 접합을 위한 5 um Cu@Sn 입자 기반 프리폼의 천이액상 소결접합 특성
B
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J
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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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WC-20wt%Co 초경 합금의 미세 조직 변화에 따른 인장 및 피로 성질
G
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N
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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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DC 마그네트론 스퍼터링에서 입방정 질화붕소 박막의 증착 거동에 미치는 이온 플럭스 변화의 영향
Y
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최영환, 허주열, 백영준
Korean J. Met. Mater.
2023;61(11):824-829. Published online 2023 Oct 29
DOI:
https://doi.org/10.3365/KJMM.2023.61.11.824
Abstract
Cubic boron nitride (cBN) thin films were deposited using DC magnetron sputtering, and the effect of the ion flux on the deposition behavior and residual stress of the cBN thin films was investigated. To increase the ion flux, the magnetic force ratio of the central/peripheral permanent magnets inserted in the.....
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L-DED 공정으로 제조된 AISI 316L 스테인리스 스틸의 적층 형상 및 특성에 미치는 공정 변수의 영향
J
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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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Web of Science 11
Crossref 12
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Ag 코팅 Cu 플레이크의 산화 억제에 미치는 Ni interlayer 형성 도금욕의 영향
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김지환, 이종현
Korean J. Met. Mater.
2023;61(10):748-759. Published online 2023 Sep 25
DOI:
https://doi.org/10.3365/KJMM.2023.61.10.748
Abstract
To suppress Ag dewetting from around 200
o
C in Ag-coated Cu (Cu@Ag) flakes, Ag and Ni-coated Cu (Cu@Ni@Ag) flakes were fabricated by successive Ni and Ag electroless plating. The Ni bath type was an important consideration to induce differences in the Ag dewetting and resultant Cu oxidation. An acid Ni.....
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Web of Science 2
Crossref 2
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Korean J. Met. Mater.
2023;61(6):431-436. Published online 2023 May 18
DOI:
https://doi.org/10.3365/KJMM.2023.61.6.431
Abstract
The addition of Cu to layered Bi
2
Te
3
-based thermoelectric alloys has been studied as an effective way to enhance thermoelectric transport properties. In this study, the influence of adding Cu to Bi
2
Se
3
alloys, which have the same rhombohedral crystal structure as Bi
2
Te
3
, was investigated by synthesizing a series of Cu
x
Bi
2
Se
3
(
x
.....
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Web of Science 2
Crossref 2
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Cu 및 Zr 첨가 A356 합금의 열처리 조건에 따른 상 변화와 기계적 특성 분석
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송태웅, 구자욱, 전승병, 정창열
Korean J. Met. Mater.
2023;61(5):311-323. Published online 2023 Apr 20
DOI:
https://doi.org/10.3365/KJMM.2023.61.5.311
Abstract
Cast A356(Al-Si-Mg) alloys are widely used in automotive and general applications because of their mechanical properties and castability. Al-Si-Mg-(Cu) alloys typically lose their strength above 170 o C due to coarsening of precipitates, which limits their application to components. To maintain their strength at elevated temperature, Al-Si-Mg-(Cu) alloys are modified.....
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Web of Science 3
Crossref 3
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집속이온빔 가공 처리된 오스테나이트 스테인리스강의 표면 손상층 제어 방법
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진형하, 류이슬
Korean J. Met. Mater.
2023;61(2):137-143. Published online 2023 Jan 27
DOI:
https://doi.org/10.3365/KJMM.2023.61.2.137
Abstract
There is substantial concern about the phase change to artificial ferrite or martensite in commercial austenitic stainless steels during intense focused-ion-beam milling. In this work, severe Ga ion milling to prepare microscale samples was found to produce thin transformed layers on the surface of austenitic stainless steel. The surface BCC.....
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Web of Science 3
Crossref 3
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Korean J. Met. Mater.
2023;61(2):120-125. Published online 2023 Jan 27
DOI:
https://doi.org/10.3365/KJMM.2023.61.2.120
Abstract
In the present study, we analyzed the thermal and mechanical properties of Cu-graphite composites (CGCs) with spatially anisotropic graphite layers. These composites were fabricated using a combination of electroless plating and spark plasma sintering (SPS) processes. Thermal conductivities and thermal expansion coefficients of the composites were measured using differential thermal.....
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Web of Science 2
Crossref 2
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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
2
O
4
is one of the p-type semiconductor cathode materials that can be used for photoelectrochemical hydrogen production via environment-friendly water electrolysis. CuBi
2
O
4
has a bandgap of 1.5 – 1.8 eV which allows it to photogenerate electrons.....
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Web of Science 1
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Bi
2
Te
3
, Sb
2
Te
3
, 및 Bi
0.5
Sb
1.5
Te
3
플레이크들의 광학 및 광전자적 특성
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조현승, 김주원, 김상일, 김태완
Korean J. Met. Mater.
2023;61(2):107-114. Published online 2023 Jan 27
DOI:
https://doi.org/10.3365/KJMM.2023.61.2.107
Abstract
In this study, a mechanical exfoliation method was developed for the synthesis of high purity Bi
2
Te
3
, Sb
2
Te
3
, and Bi
0.5
Sb
1.5
Te
3
flakes. The synthesized Bi
2
Te
3
, Sb
2
Te
3
, and Bi
0.5
Sb
1.5
Te
3
flakes were characterized by atomic force microscope, Raman spectroscopy, and photoluminescence (PL). The effect of the thickness of the Bi
2
Te
3
, Sb
2
Te
3
, and Bi
0.5
Sb
1.5
Te
3
flakes.....
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