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Cu 첨가에 따른 p-type Bi
0.5
Sb
1.5
Te
3
및 Bi
0.4
Sb
1.6
Te
3
합금의 양극성 전도 저감 효과
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조현준, 김현식, 손웅희, 김상일
Korean J. Met. Mater.
2020;58(6):439-445. Published online 2020 May 21
DOI:
https://doi.org/10.3365/KJMM.2020.58.6.439
Abstract
In this study, we report how Cu doping can modify the thermoelectric performance of
p
-type Bi
0.5
Sb
1.5
Te3 and Bi
0.4
Sb
1.6
Te3 thermoelectric alloys, including their electronic and thermal transport properties. For electronic transport, the power factors of both Bi
0.5
Sb
1.5
Te3 and Bi0.4Sb1.6Te3 compositions were increased by Cu doping. The origins of the enhanced power.....
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CaF
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저반사 코팅된 ZnS 윈도우의 8~12 µm 적외선 영역 광학적 특성
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이일주, 홍승찬, 김병삼, 천재경
Korean J. Met. Mater.
2020;58(6):433-438. Published online 2020 May 19
DOI:
https://doi.org/10.3365/KJMM.2020.58.6.433
Abstract
Technologies for pedestrian safety are increasingly emphasized by Automakers in advance of autonomous driving vehicles. A Night Vision System attached behind the front grille can reduce fatal accidents, especially during the nighttime, however, consumers may hesitate to adopt such systems on account of their high price. High-cost Germanium is used.....
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기계 학습을 활용한 마그네슘 합금의 통전 비선형 온도 예측
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유진영, 이명재, 문영훈, 노유정, 이태경
Korean J. Met. Mater.
2020;58(6):413-422. Published online 2020 May 19
DOI:
https://doi.org/10.3365/KJMM.2020.58.6.413
Abstract
Electropulse-induced heating has attracted attention due to its high energy efficiency. However, the process gives rise to a nonlinear temperature variation, which is difficult to predict using a traditional physics model. As an alternative, this study employed machine-learning technology to predict such temperature variation for the first time. Mg alloy.....
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인코넬 FM52 및 308L 스테인리스강을 이용한 탄소강 이종 클래딩 및 공정변수에 따른 응고균열 발생 거동 변화: Transverse-Varestraint 시험을 이용한 응고취성 온도범위 평가
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김유경, 문병록, 강남현, 천은준
Korean J. Met. Mater.
2020;58(6):403-412. Published online 2020 May 14
DOI:
https://doi.org/10.3365/KJMM.2020.58.6.403
Abstract
In this study, solidification cracking behavior and susceptibility in dissimilar cladding of Inconel alloy FM 52, 308L stainless steel to carbon steel, was investigated by submerged arc welding and transverse−Varestraint testing with gas tungsten arc welding. The effect of cladding conditions on cracking behavior and susceptibility was extensively evaluated, and.....
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분말 합금법으로 제조된 Ni-Cr-Al 초합금 다공체의 인장 특성에 미치는 변형률 속도 및 하중 방향 효과
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김규식, 배정석, 오재성, 이기안
Korean J. Met. Mater.
2020;58(6):375-382. Published online 2020 May 20
DOI:
https://doi.org/10.3365/KJMM.2020.58.6.375
Abstract
The powder-alloyed metallic sheet foam manufacturing process has the advantage of being able to control pore shape, size, and distribution more easily and homogeneously than conventional foam manufacturing processes. The effects of strain rate and tensile direction on the mechanical properties of Ni-Cr-Al superalloy foam fabricated by powder alloying method.....
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규산 소다의 경화 반응을 이용한 상온 경화 괴성광 제조에 대한 연구
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김강민, 한정환
Korean J. Met. Mater.
2020;58(6):369-374. Published online 2020 May 20
DOI:
https://doi.org/10.3365/KJMM.2020.58.6.369
Abstract
New technologies need to be developed in the ironmaking process to reduce carbon dioxide emissions. To achieve this, in recent years steelmakers have been working to reduce coke usage by increasing thermal energy efficiency. However, it is very difficult to reduce coke consumption while maintaining production, because the level of.....
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탄점소성 구성모델을 활용한 폴리우레탄 폼의 밀도 및 변형률 속도 의존 변형률 경화-연화 연성 재료 거동 규명
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김태림, 이치승
Korean J. Met. Mater.
2020;58(5):357-367. Published online 2020 Apr 20
DOI:
https://doi.org/10.3365/KJMM.2020.58.5.357
Abstract
Polyurethane foam (PUF) is one of the most well-known cellular materials and is widely employed in various industrial and biomedical fields thanks to its many advantages. These include mechanical and material characteristics such as low density and thermal conductivity, and high specific elastic modulus and strength. Despite of these advantages,.....
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대기압의 공기 분위기에서 촉매를 사용하지 않는 열증발법을 이용하여 생성된 TiO
2
나노구조
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이근형
Korean J. Met. Mater.
2020;58(5):353-356. Published online 2020 Apr 14
DOI:
https://doi.org/10.3365/KJMM.2020.58.5.353
Abstract
TiO
2
nanostructures were synthesized using a thermal evaporation method without a catalyst. TiO powders mixed with graphite powders were used as the source materials. The synthesis process was performed in air atmosphere at 1000 °C. When the mass ratio of TiO/graphite in the source material was 2:1, TiO
2
nanowires and.....
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Korean J. Met. Mater.
2020;58(5):348-352. Published online 2020 Apr 20
DOI:
https://doi.org/10.3365/KJMM.2020.58.5.348
Abstract
Layered post transition metal chalcogenides such as SnSe, SnSe
2
, In
2
Se
3
, and In
4
Se
3
have attracted attention as promising thermoelectric materials due to their intrinsically low lattice thermal conductivities. Recently,
n
-type indium selenide (InSe) based materials have also been suggested as good candidates for thermoelectric materials by optimizing their electrical properties, i.e.,.....
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Korean J. Met. Mater.
2020;58(5):340-347. Published online 2020 Apr 20
DOI:
https://doi.org/10.3365/KJMM.2020.58.5.340
Abstract
Tetrahedrite (C
12
Sb
4
S
13
) has attracted attention as a p-type thermoeletric material with very low thermal conductivity induced by the anharmonic oscillation of Cu due to the lone-pair electrons of Sb. Many studies have been conducted to improve its thermoelectric performance by partially substituting the transition elements for the Cu sites. In.....
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산화물 환원공정에 의해 제작된 n-형 Bi
2
Te
2.7
Se
0.3
화합물의 열전특성연구
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임영수, 박배건, 이길근
Korean J. Met. Mater.
2020;58(5):334-339. Published online 2020 Apr 20
DOI:
https://doi.org/10.3365/KJMM.2020.58.5.334
Abstract
We report the thermoelectric transport properties of n-type Bi
2
Te
2.7
Se
0.3
compounds prepared by oxide-reduction process. The oxide-reduction process is a recently developed method that can synthesize Bi2Te3-based compounds using only oxide starting materials, which is advantageous in terms of the diversity of the starting materials and cost efficiency. In this study,.....
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고강도 API 라인파이프강의 저온 인성에 미치는 베이나이트계 미세조직의 영향
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이승완, 이상인, 황병철
Korean J. Met. Mater.
2020;58(5):293-303. Published online 2020 Apr 20
DOI:
https://doi.org/10.3365/KJMM.2020.58.5.293
Abstract
In this study the correlation between bainitic microstructure and the low-temperature toughness of high-strength API pipeline steels was discussed in terms of crack initiation and propagation in the microstructure. Three types of API pipeline steels with different bainitic microstructures were fabricated using varying alloying elements and thermo-mechanical processing conditions, and.....
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Korean J. Met. Mater.
2020;58(4):272-277. Published online 2020 Mar 9
DOI:
https://doi.org/10.3365/KJMM.2020.58.4.272
Abstract
Tetrahedrite has low lattice thermal conductivity because of the lone-pair electrons of Sb, which cause the Cu atoms to vibrate at a low frequency and high amplitude. The synthesis of tetrahedrite compounds by conventional melting methods requires a long-time reaction and annealing. However, a homogeneous and solid-state synthesis can be.....
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개선된 화학 용액 증착법 성장 온도에 따른 Fe
2
O
3
광전극의 물리화학적 및 광전기화학적 특성 연구
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홍예진, 전승환, 류혁현, 이원재
Korean J. Met. Mater.
2020;58(4):263-271. Published online 2020 Mar 10
DOI:
https://doi.org/10.3365/KJMM.2020.58.4.263
Abstract
In this study, Fe
2
O
3
photoelectrode thin films were grown on fluorine-doped tin oxide substrates at various temperatures ranging from 145 to 220 oC using modified chemical bath deposition. The morphological, structural, electrical, and photoelectrochemical properties of the resulting Fe
2
O
3
photoelectrode were analyzed using field emission scanning electron microscopy, X-ray diffraction,.....
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Ni-Cr-Co-Al-Mo-Ti-Re-Ta-W-Ru 단결정의 대기중 1000
o
C에서의 산화
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한준희, Xiao Xiao, 이동복
Korean J. Met. Mater.
2020;58(4):234-246. Published online 2020 Mar 11
DOI:
https://doi.org/10.3365/KJMM.2020.58.4.234
Abstract
Three kinds of Ni-based single crystals with the compositions of 63.8Ni-7.5Cr-5.1Co-4.8Al-1.9Mo- 0.9Ti-3Re-11.8Ta-1.2W, 61.4Ni-7.4Cr-5Co-4.8Al-1.8Mo-0.9Ti-3.1Re-11.6Ta-4W, and 60.9Ni-7.5Cr-5Co-4.8Al- 2Mo-1Ti-2.9Re-10.9Ta-1.2W-3.8Ru, in wt%, were cast in a Bridgman furnace. In the cast alloys, Cr, Co, Re, Mo, W, and Ru became microsegregated in dendrites consisting of γ-Ni, while Ni, Ta, and Al microsegregated in interdendrites.....
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고압 다이캐스팅 Al-6Si계 합금의 인장특성 및 열전도성에 미치는 Ni과 Cu 첨가 영향
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장재철, 신광선
Korean J. Met. Mater.
2020;58(4):217-226. Published online 2020 Mar 10
DOI:
https://doi.org/10.3365/KJMM.2020.58.4.217
Abstract
In this study, the effects of nickel and copper on the mechanical and thermal properties of Al-Si alloys were investigated, for different alloy compositions. Thermodynamic calculations were carried out to predict the alloys’ solidification behavior (solidification temperature, solid fraction and physical properties (density, thermal conductivity, elastic modulus, bulk modulus)). The.....
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나노인덴테이션 방법으로 크롬 박막의 고유경도를 측정하는 방법과 영향 인자
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강영준, 백주환, 박현, 조영래
Korean J. Met. Mater.
2020;58(3):207-215. Published online 2020 Mar 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.3.207
Abstract
Materials with very small dimensions exhibit different physical and mechanical properties compared to their bulk counterparts. This becomes significantly important for the thin films that are widely used as components in micro-electronics and functional materials. In this study, a chromium (Cr) thin film was deposited on a silicon (Si) wafer.....
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후열처리 공정이 스퍼터링법으로 제조된 NiTe
2
박막의 물리적 성질에 미치는 영향
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박호준, 이준호, 민병욱, 김석준
Korean J. Met. Mater.
2020;58(3):195-200. Published online 2020 Mar 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.3.195
Abstract
In this study, the effect of post annealing time on the physical properties of NiTe
2
thin films with 2D structure deposited by co-sputtering was investigated. After heat treatment for 10 min, nickel ditelluride thin films with a composition of Ni : Te = 1 : 2 exhibited transmittance of 46%.....
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Korean J. Met. Mater.
2020;58(3):182-189. Published online 2020 Mar 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.3.182
Abstract
Quarternay carbides of Ti
3
Al
x
Si
1-x
C
2
(x=0.3, 0.5, and 0.7) were oxidized at 400, 600, and 800 °C for 0.5-6 months in order to study their long-time oxidation behavior in air. When they were oxidized at 400-600
o
C for 0.5-3 months, oxidation proceeded relatively slowly with moderate weight gains. However, further oxidation.....
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박막 잔류응력 및 제조공정에 따른 금속박막층 미세크랙 영향
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조병규, 홍승찬, 김병삼, 천재경
Korean J. Met. Mater.
2020;58(3):175-181. Published online 2020 Mar 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.3.175
Abstract
In recent automobile trends, the functions of opening and closing the vehicle door are accomplished by touch sensor and smart-phone NFC (Near Field Communication) systems. These convenience features are incorporated into the outdoor handle. However, this function can’t be used when chrome plating is applied to this part for design.....
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A
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초탄성 티타늄 합금의 인장 변형거동 고찰
H
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정혜진, 르우비엣띠엔, 정용하, 홍성태, 한흥남
Korean J. Met. Mater.
2020;58(3):162-168. Published online 2020 Mar 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.3.162
Abstract
A superelastic titanium alloy was subjected to uniaxial tensile deformation at room temperature. The microstructural evolution and deformation mechanisms of the superelastic titanium alloy were investigated by electron backscatter diffraction (EBSD) and X-ray diffraction (XRD). Multiple deformation mechanisms including stress-induced martensitic transformation (SIMT), dislocation slip, {332}<113> and {112}<111> mechanical twinning.....
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Strip Casting 공정으로 제조된 Al 3003 합금의 미세조직, 인장 및 피로 특성에 미치는 후열처리 영향
M
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n
-
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백민석, 어광준, 정창열, 이기안
Korean J. Met. Mater.
2020;58(3):151-161. Published online 2020 Mar 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.3.151
Abstract
Al 3003 alloy was manufactured by strip casting process, and the effect of post heat-treatment on tensile and fatigue properties was investigated. The strip cast Al 300 alloy exhibited a unique globular shaped rapid-cooled solidification structure, and the microstructural characteristic remained after heat-treatment. Asstrip cast (F) and heat-treated (O) alloys.....
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증착 각도 조절 기반 패턴전사프린팅을 통한 패턴 형상의 제어
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박태완, 박운익
Korean J. Met. Mater.
2020;58(2):145-150. Published online 2020 Jan 8
DOI:
https://doi.org/10.3365/KJMM.2020.58.2.145
Abstract
The nanofabrication of modern electronic devices requires advanced nanopatterning technologies. To fabricate desirable nanodevices with excellent device performance, controlling the shape and dimension of the pattern is very important. However, to achieve more facile and faster device fabrication, with better pattern resolution, pattern-tunability, process simplicity, and cost-effectiveness, some remaining challenges.....
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에너지-전이 형광 특성 향상을 위한 다공성 실리카 중간층이 추가된 코어-쉘 나노입자 제조 및 특성평가
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심우형, 김세윤, 신원호, 정형모
Korean J. Met. Mater.
2020;58(2):137-144. Published online 2020 Jan 8
DOI:
https://doi.org/10.3365/KJMM.2020.58.2.137
Abstract
Multi-layer core-shell nanoparticles (YVO
4
:Nd
3+
/mSiO
2
/SiO
2
) consisting of silica cores (SiO
2
), mesoporous silica (mSiO
2
) intermediate layers, and Neodymium doped rare-earth phosphor (YVO
4
:Nd
3+
) shell layers were successfully synthesized using the stepwise sol-gel method. The morphological structure and optical properties of the functional core-shell nanoparticles were characterized and evaluated by transmission electron microscopy (TEM),.....
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Korean J. Met. Mater.
2020;58(2):112-124. Published online 2020 Jan 8
DOI:
https://doi.org/10.3365/KJMM.2020.58.2.112
Abstract
In this study, an electrospray technique was used for the synthesis of macroporous ceramic particles, such as silica or titania, by a colloidal templating method. For this purpose, a suspension of polystyrene nanospheres was synthesized by dispersion polymerization for use as sacrificial templates. The feed solution containing a ceramic precursor.....
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AZ31 마그네슘 합금의 플라즈마전해 산화막 두께 성장에 따른 내식특성
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최보은, 정원섭, 김용환
Korean J. Met. Mater.
2020;58(2):87-96. Published online 2020 Jan 8
DOI:
https://doi.org/10.3365/KJMM.2020.58.2.87
Abstract
The growth of the PEO coating with processing time on an AZ31B magnesium alloy in a dilute alkaline electrolyte containing silicate and the corrosion characteristics according to its thickness were investigated. The oxide film grew a porous outer layer mainly consisting of silicate with the spark discharge phenomenon from the.....
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전도식 원자현미경을 이용한 ZnO 나노로드 기반 압전 나노발전기의 사이즈 의존성 평가
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양이준, 김관래
Korean J. Met. Mater.
2020;58(1):67-75. Published online 2020 Jan 1
DOI:
https://doi.org/10.3365/KJMM.2020.58.1.67
Abstract
ZnO nanorods are one of the most studied materials because it can be facilely grown on a wide range of substrates at low temperature. ZnO exhibits piezoelectricity as well as semiconducting properties, and hence is applicable to piezoelectric nanogenerators and sensors. In the present work, the effect of ZnO nanorods’.....
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음이온 교환막 수전해에 사용되는 Cu
0.72
Co
2.28
O
4
산소 발생 촉매의 합성 및 특성 분석
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박성민, 장명제, 박유세, 이주영, 정재엽, 정재훈, 최민관, 노유성, 서민호, 김형주, 양주찬, 김양도, 최승목
Korean J. Met. Mater.
2020;58(1):49-58. Published online 2019 Dec 12
DOI:
https://doi.org/10.3365/KJMM.2020.58.1.49
Abstract
In this study, we investigated the morphological, crystal structural, electronic structural, and electrocatalytic properties of the inverse spinel structured copper cobalt oxide (Cu
0.72
Co
2.28
O
4
) catalysts. The materials were prepared by coprecipitation using various copper and cobalt precursors, and subsequent oxidation treatment. Electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Brunauer Emmett.....
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Cited By 1
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고전류밀도에서 유기첨가제에 의한 구리 전착층의 전기적 특성 변화
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우태규, 박일송
Korean J. Met. Mater.
2020;58(1):41-48. Published online 2019 Dec 12
DOI:
https://doi.org/10.3365/KJMM.2020.58.1.41
Abstract
Electroplating has many economic advantages in producing copper foils. The easiest way to manufacture electroplated copper foil with various properties is to add appropriate additives. This study evaluated the surface properties, mechanical and electrical properties of copper foil electroplated in electrolytes containing the leveler JGB (Janus Green B). When the.....
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알칼리 가스에 의한 SiC 및 Si
3
N
4
의 침식 거동
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김주훈, 김강민, 이지아, 김정일, 한정환
Korean J. Met. Mater.
2020;58(1):17-25. Published online 2019 Dec 12
DOI:
https://doi.org/10.3365/KJMM.2020.58.1.17
Abstract
Studies of effective furnace cooling technology and refractory materials have extended the lifetime of a blast furnace to more than 15 years. On the other hand, the replacement of refractories in the blast furnace results in considerable cost and time loss for stopping the blast furnace operation. Various kinds of.....
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