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Korean J. Met. Mater.
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수소 분위기에서 Mg와 VCl
3
의 밀링에 의한 Mg의 수소 흡수 방출 특성의 향상
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송명엽, 이성호, 곽영준
Korean J. Met. Mater.
2021;59(10):709-717. Published online 2021 Sep 6
DOI:
https://doi.org/10.3365/KJMM.2021.59.10.709
Abstract
VCl
3
(vanadium (III) chloride) was selected as an additive to Mg to increase the hydrogenation and dehydrogenation rates and the hydrogen storage capacity of Mg. Instead of MgH
2
, Mg was used as a starting material since Mg is cheaper than MgH
2
. Samples with a composition of 95 wt% Mg +.....
More
Crossref 5
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Korean J. Met. Mater.
2019;57(10):663-672. Published online 2019 Sep 6
DOI:
https://doi.org/10.3365/KJMM.2019.57.10.663
Abstract
The dehydrogenation rates of graphene-added Mg (named Mg-5graphene) were very low at 573 K and 593 K. Ni was added to increase the dehydrogenation rates of graphene-added Mg. Samples (designated as Mg-2.5Ni-2.5graphene) with a composition of 95 wt% Mg + 2.5 wt% Ni + 2.5 wt% graphene were prepared by.....
More
Web of Science 7
Crossref 6
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Korean J. Met. Mater.
2018;56(12):878-884. Published online 2018 Dec 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.12.878
Abstract
In the present work, we selected a polymer, polyvinylidene fluoride (PVDF), as an additive to improve the hydrogenation and dehydrogenation properties of Mg. 95 wt% Mg + 5 wt% PVDF (designated Mg-5PVDF) samples were prepared via milling in hydrogen atmosphere (reactive milling), and the hydrogenation and dehydrogenation characteristics of the.....
More
Crossref 5
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Korean J. Met. Mater.
2018;56(8):620-627. Published online 2018 Aug 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.8.620
Abstract
In our previous work, samples with a composition of 95 wt% Mg + 5 wt% CMC (Carboxymethylcellulose, Sodium Salt, [C
6
H
7
O
2
(OH)
x
(C
2
H
2
O
3
Na)
y
]
n
) (named Mg-5 wt%CMC) were prepared through hydride-forming milling. Mg-5 wt%CMC had a very high hydrogenation rate but a low dehydrogenation rate. Addition of Ni to Mg is known to increase.....
More
Crossref 5
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Korean J. Met. Mater.
2018;56(8):611-619. Published online 2018 Aug 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.8.611
Abstract
TaF
5
and VCl
3
were chosen as additives to enhance the hydrogen uptake and release rates of Mg. The total content of the additives was not more than 10 wt% since too high content reduces the fraction of Mg and thus the hydrogen storage capacity of the alloys. Samples with compositions.....
More
Crossref 7
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니켈기 초내열합금의 열화에 따른 미세구조 및 저주기 피로손상도 평가
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허인강, 윤동현, 홍상현, 김진열, 김재훈, 장성호, 배시연
Korean J. Met. Mater.
2018;56(8):561-569. Published online 2018 Aug 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.8.561
Abstract
Nickel-based superalloys have excellent resistance to extreme environments such as high temperature and high stress and are used as materials for large gas turbines. In this paper, specimens were taken from a blade that had been used for a long time, and their life span was studied by analysis of microstructure......
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Crossref 3
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Korean J. Met. Mater.
2018;56(5):392-399. Published online 2018 May 8
DOI:
https://doi.org/10.3365/KJMM.2018.56.5.392
Abstract
The addition of CMC (Carboxymethylcellulose, Sodium Salt) may improve the hydriding and dehydriding properties of Mg since it has a relatively low melting point and the melting of CMC during transformation-involving milling may put the milled samples in good states to absorb and release hydrogen rapidly. Samples with compositions of.....
More
Crossref 6
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전류밀도에 따른 플립칩 Sn-Ag 솔더 범프의 Electromigration 손상기구 분석
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김가희, 손기락, 박규태, 박영배
Korean J. Met. Mater.
2017;55(11):798-805. Published online 2017 Oct 31
DOI:
https://doi.org/10.3365/KJMM.2017.55.11.798
Abstract
The effect of current densities on the electromigration (EM) failure mechanism of flip chip Cu/Ni/Sn-Ag/Cu solder bumps was investigated under stressing conditions at current densities ranging from 5.0~6.9 × 10
3
A/cm
2
at 150 ℃. The EM failure times at 5.0 × 10
3
A/cm
2
were around 11 times longer than at.....
More
Crossref 1
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Fe-Mn-Al-Si-Sb-C 강의 고온산화에 미치는 Mn, Si, Sb 첨가효과
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박순용, 이동복
Korean J. Met. Mater.
2017;55(5):308-314. Published online 2017 May 9
DOI:
https://doi.org/10.3365/KJMM.2017.55.5.308
Abstract
High Mn twinning-induced plasticity (TWIP) steels with compositions of Fe-(18.0-18.17) Mn-1.51Al-(0.48-0.52)Si-(0.61-0.62)C-(0.52-0.54)Cr-(0.22-0.23)Ni-0.03Nb-(0-0.04)Sb (wt%) are oxidized at 650 ℃ and 750 ℃ for < 24 h in air in order to determine the effect of the alloying elements on the oxidation. They are oxidized parabolically to MnO
2
,Mn
2
O
3
,FeO,Fe
2
O
3
, and FeMn
2
O
4
oxides with relatively.....
More
Crossref 1
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Korean J. Met. Mater.
2017;55(2):98-109. Published online 2017 Feb 2
DOI:
https://doi.org/10.3365/KJMM.2017.55.2.98
Abstract
The aim of this study is to establish an optimized hot-press sintering condition for aluminum matrix composites (AMCs) by analyzing their sintered microstructure and mechanical properties. The fabricated AMCs in this study consisted of a blend of commercial Ecka Alumix 431 powder, and Al-Si/SiC
p
powder manufactured by gas atomizer (Al-Si/SiC
p
)......
More
Crossref 1
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탄재내장 산화철 브리켓의 환원거동에 미치는 염기도 영향
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권재홍, 권의혁, 이기우, 김강민, 이지아, 한정환
Korean J. Met. Mater.
2016;54(11):846-854. Published online 2016 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.11.846
Abstract
The world is gradually running short of high quality iron resources. This forces ironmaking processes to focus on the use of low quality iron ores. Carbon composite iron oxide briquettes (CCB) are one of the alternative choices. CCB enables the utilization of low quality powdered iron ores and coal, and.....
More
Crossref 1
Casting/Solidification/Heat Treatment
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다이캐스팅 공정에 사용된 개량형 STD61 열간 금형 표면의 미세조직에 관한 연구
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유하영, 이승준, 강민우, 이석진, 양원존, 정재석, 김병훈, 이영국
Korean J. Met. Mater.
2016;54(9):672-680. Published online 2016 Sep 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.9.672
Abstract
The surface microstructure and crack formation of an aluminum die-casting mold were investigated. The mold was made of a modified STD61 steel, and was used for more than 165,000 cycles. The mold surface consisted of four layers; an oxidized layer, a decarburized layer, a network carbide layer and a tempered...
More
Corrosion & Surface Treatment
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Korean J. Met. Mater.
2016;54(9):645-651. Published online 2016 Sep 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.9.645
Abstract
Pure Mg, Mg-5wt%Ca, and Mg-5wt%Ca-1wt%Zn alloys were cast, and their high-temperature oxidation behavior was investigated to determine the roles of Ca and Zn in oxidation. Ca and Zn additions refined the microstructure by formation of Mg
2
Ca and Ca
2
Mg
6
Zn
3
, respectively, at grain boundaries. Ca increased the oxidation resistance by forming a.....
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Crossref 2
Powder Metallurgy
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/W/Mo-Graphite 코팅층의 2100 ℃ 열처리 후 미세조직 변화에 관한 연구
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안규백, 최경환, 김상섭, 조규섭
Korean J. Met. Mater.
2016;54(8):559-565. Published online 2016 Aug 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.8.559
Abstract
A tungsten coating was deposited onto a graphite substrate using the atmospheric plasma spraying (APS) technique. In order to increase the adhesion strength between the metallic tungsten(W) and graphite, a molybdenum (Mo) interlayer was pre-deposited onto the graphite surface by utilizing the APS technique. Also, after deposition of a APS-W.....
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Crossref 4
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