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Korean J. Met. Mater.
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Korean Journal of Metals and Materials
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친환경 Ti 및 TiH
2
분말 제조를 위한 TiO
2
의 칼슘열환원에 대한 기초연구
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박성훈, 강정신, 손호상
Korean J. Met. Mater.
2024;62(3):190-203. Published online 2024 Feb 28
DOI:
https://doi.org/10.3365/KJMM.2024.62.3.190
Abstract
To develop an eco-friendly titanium (Ti) production process, the calciothermic reduction of titanium dioxide (TiO
2
) was investigated. The mechanism involved in the reduction of TiO
2
using calcium (Ca) was examined. The influence of a molten salt, calcium chloride (CaCl
2
), on the calciothermic reduction was investigated by conducting experiments at 1123.....
More
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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.....
More
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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.....
More
Crossref 1
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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.....
More
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아연치환체의 무기산 침출액에서 선택적 환원에 의한 고순도 팔라듐금속의 회수
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송시정, Viet Nhan Hoa Nguyen, 이만승
Korean J. Met. Mater.
2022;60(11):837-844. Published online 2022 Oct 31
DOI:
https://doi.org/10.3365/KJMM.2022.60.11.837
Abstract
A small amount of Pd(II) present in spent electroplating solutions is concentrated by cementation. In this work, a process was developed to recover pure palladium metal by selective reduction from the hydrochloric and the sulfuric acid leaching solutions of cemented zinc. For this purpose, hydrazine and ascorbic acid were employed.....
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Web of Science 1
Crossref 1
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산화물 환원공정에 의한 n형 Bi
2
Te
2.7
Se
0.3
화합물의 합성과 열전특성
Y
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임영수, 박배건, 이길근
Korean J. Met. Mater.
2022;60(6):463-470. Published online 2022 May 24
DOI:
https://doi.org/10.3365/KJMM.2022.60.6.463
Abstract
We present a study on the synthesis of Bi
2
Te
2.7
Se
0.3
powders through an oxide reduction process and also on the effect of the oxide reduction process on the thermoelectric transport properties of the resulting Bi
2
Te
2.7
Se
0.3
compounds. Starting materials of Bi
2
O
3
, TeO
2
and SeO
2
were mechanical milled for homogeneous mixing, and then.....
More
Web of Science 5
Crossref 6
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고분자 전해질 연료전지의 산소환원반응에 대한 Pt-M 합금 촉매의 최근 연구 동향
Y
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심유진, 정원석
Korean J. Met. Mater.
2021;59(10):741-752. Published online 2021 Sep 6
DOI:
https://doi.org/10.3365/KJMM.2021.59.10.741
Abstract
Due to environmental pollution and global warming, research on new energy sources that can replace fossil fuels is important. A fuel cell is an eco-friendly energy conversion system that discharges water, and uses hydrogen as fuel. Although platinum is a widely used catalyst in PEMFCs, it has commercial limitations because.....
More
Crossref 2
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초음파 분무 열분해법으로 제조한 텅스텐 미세분말의 미세조직과 소결 거동
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조현희, 김정현, 이영인, 정영근, 오승탁
Korean J. Met. Mater.
2021;59(5):289-294. Published online 2021 Apr 6
DOI:
https://doi.org/10.3365/KJMM.2021.59.5.289
Abstract
The powder microstructure and sintering behavior of W prepared by ultrasonic spray pyrolysis and spark plasma sintering were investigated. Fine-grained W powders were synthesized by ultrasonic spray pyrolysis using an ammonium metatungstate hydrate solution and hydrogen reduction. The XRD analysis of the powder, pyrolyzed below 600
o
C, showed tungsten oxide.....
More
Web of Science 2
Crossref 2
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수소 기반 환원 제철 공정과 전환 기술
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이상호, 이운재, 이영석, 김완호
Korean J. Met. Mater.
2021;59(1):41-53. Published online 2021 Jan 5
DOI:
https://doi.org/10.3365/KJMM.2021.59.1.41
Abstract
This study analyzed the current state of technical development of the BF-based process, to determine ways to reduce carbon consumption. The technical features of the hydrogen reduction ironmaking process were also examined as a decarbonized ironmaking method, and related issues that should be considered when converting to hydrogen reduction are.....
More
Web of Science 15
Crossref 14
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Korean J. Met. Mater.
2020;58(11):798-807. Published online 2020 Oct 15
DOI:
https://doi.org/10.3365/KJMM.2020.58.11.798
Abstract
Facile, economic methods of preparing tungsten (W) nanopowder are critically needed to meet industrial demand. Herein, we report a method of preparing single-phase alpha-W (α-W) nanopowders using ammonium paratungstate (APT) as a starting material and the optimum synthesis conditions. The process involves two stages: i) the radio-frequency (RF) induction thermal.....
More
Web of Science 4
Crossref 4
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규산 소다의 경화 반응을 이용한 상온 경화 괴성광 제조에 대한 연구
K
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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.....
More
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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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Web of Science 3
Crossref 4
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광환원반응을 통한 TiO
2
/Pd 복합광촉매 제조와 광촉매 특성
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이종호, 안홍주, 윤정일, 김영직, 서수정, 오한준
Korean J. Met. Mater.
2019;57(8):510-520. Published online 2019 Jul 8
DOI:
https://doi.org/10.3365/KJMM.2019.57.8.510
Abstract
To decompose dye in aqueous solution, Pd nanoparticle-decorated TiO
2
nanotube photocatalysts were fabricated through electrochemical anodization and photoreduction processes. Morphological and surface characterization of the TiO
2
/Pd heterojunction photocatalyst, as well as photoelectrochemical behaviors, were investigated by X-ray diffraction, UV/Vis diffuse reflectance and photocurrent response. It was found that the precipitated.....
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Web of Science 5
Crossref 3
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Korean J. Met. Mater.
2019;57(6):390-395. Published online 2019 May 16
DOI:
https://doi.org/10.3365/KJMM.2019.57.6.390
Abstract
We demonstrate a synthetic route to high-quality Sn microcrystals using thermal chemical vapor deposition (CVD) in a hydrogen-reducing atmosphere. During thermal CVD with SnO2 powder, a mixture of Ar and H2 (4%) gases was used as a carrier gas to maintain a hydrogen reduction environment. Hydrogen maintained a reduction environment.....
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Web of Science 2
Crossref 2
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BaO가 담지된 V2O5-WO3/TiO2 SCR 촉매의 질소산화물 흡, 탈착 특성 및 제거 효율
J
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김진우, 예보라, 이민우, 정보라, 이덕현, 이희수, 김홍대
Korean J. Met. Mater.
2019;57(4):270-277. Published online 2019 Apr 5
DOI:
https://doi.org/10.3365/KJMM.2019.57.4.270
Abstract
Recently, directly emitted NOx upon start-up has been spotlighted as a significant emissions problem. BaO loaded V2O5-WO3/TiO2 Selective Catalytic Reduction (SCR) catalysts were synthesized with various contents of barium which was a representative NOx adsorbent and their NOx adsorption, desorption, and removal efficiency were shown. The phase of BaO was.....
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Web of Science 3
Crossref 4
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Korean J. Met. Mater.
2018;56(5):384-391. Published online 2018 May 8
DOI:
https://doi.org/10.3365/KJMM.2018.56.5.384
Abstract
The methane reduction (MR) of SnO
2
has been proposed as a highly efficient method for recovering Sn from SnO
2
containing industrial wastes. The MR of SnO
2
also produces a mixture of H
2
and CO, which can be further utilized as a syngas for the production of various fuels through the.....
More
Crossref 2
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수소 주입 방식에 따른 세 고망간강의 수소 취화 거동 비교
S
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이승용, 황병철
Korean J. Met. Mater.
2017;55(10):695-702. Published online 2017 Sep 28
DOI:
https://doi.org/10.3365/KJMM.2017.55.10.695
Abstract
In this study the hydrogen embrittlement characteristics of three high-manganese steels were tested using different hydrogen charging methods, and the results were compared with various Mn-containing steels. The results showed that the hydrogen embrittlement susceptibility of the high-manganese steels increased with increasing inherent strength because deformation mechanisms, such as deformation.....
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염료감응형 태양전지용 니켈실리사이드 촉매재료의 물성 연구
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박태열, 김광배, 송오성
Korean J. Met. Mater.
2017;55(6):440-445. Published online 2017 Jun 1
DOI:
https://doi.org/10.3365/KJMM.2017.55.6.440
Abstract
We have investigated the properties of nickel silicides as catalysts for dye-sensitized solar cells (DSSCs) by preparing several nickel silicide layers with a 100 nm-Ni/Si (100) structure using silicidation annealing for 30 minutes at 300 ℃ – 900 ℃. X-ray diffraction (XRD), four-point probe, field emission scanning electron microscope (FE-SEM),.....
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Crossref 1
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산화성분위기에서의 탄재 내장 산화철 브리켓의 환원특성
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이기우, 김강민, 권재홍, 손상한, 한정환
Korean J. Met. Mater.
2017;55(1):24-30. Published online 2017 Jan 5
DOI:
https://doi.org/10.3365/KJMM.2017.55.1.24
Abstract
The carbon composite iron oxide briquette (CCB) is considered a potential solution to the upcoming use of low grade iron resources in the ironmaking process. CCB is able to reduce raw material cost by enabling the use of low grade powdered iron ores and coal. Additionally, the fast reduction of.....
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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
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WC/Co 초경 스크랩 산화물의 환원/침탄 반응
C
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권철민, 이길근, 하국현
Korean J. Met. Mater.
2016;54(10):743-751. Published online 2016 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.10.743
Abstract
This study conducted an analysis of the carbothermal reduction of oxidized WC/Co hardmetal scrap with solid carbon under an argon and hydrogen gas atmosphere. The WC/Co hardmetal scrap oxide consisted of WO
3
and CoWO
4
. WO
3
was reduced before CoWO
4
by the solid carbon regardless of gas atmosphere. The simple oxide.....
More
Crossref 3
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