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Korean J. Met. Mater.
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IN792 초내열 합금의 고온 산화 거동에 미치는 결정립 크기의 영향
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방지예, 이동현, 이수열
Korean J. Met. Mater.
2024;62(4):267-274. Published online 2024 Mar 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.4.267
Abstract
It is known that Ni-based superalloys possess superior mechanical properties in high-temperature and high-pressure environments. One of the drawbacks of these alloys is their tendency to oxidize at high temperatures. Improving their oxidation properties and obtaining a fundamental understanding of the underlying mechanism of their oxidation behavior are critical for.....
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일방향 응고 CM247LC 초내열합금 크리프 시편 게이지에서 고온 산화가 표면 피트 및 재결정 형성에 미치는 영향
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최병학, 최광수, 한성희, 김대현, 안종기, 강동수, 서성문
Korean J. Met. Mater.
2023;61(12):951-957. Published online 2023 Nov 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.12.951
Abstract
This study analyzed a recrystallization phenomenon that occurred simultaneously with hightemperature oxidation on the surface of a directionally solidified CM247LC creep specimen, using optical and scanning electron microscopy. After heat treatment, the surface of the specimen subjected to the creep test at 982oC was oxidized by exposure to high temperature.....
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Crossref 1
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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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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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탄소 팩 세멘테이션 (Pack cementation) 공정을 통한 상용 Ti-48Al-2Nb-2Cr 합금의 고온 내산화성 개선과 탄소 확산 경로 해석
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김동현, 최광수, 박준식, 이승훈
Korean J. Met. Mater.
2022;60(10):723-731. Published online 2022 Sep 29
DOI:
https://doi.org/10.3365/KJMM.2022.60.10.723
Abstract
γ-TiAl alloys have attracted interest as lightweight materials for structural applications at temperatures below 800
o
C. With recent improvements in microstrutural control of the γ-TiAl alloys, resulting in excellent creep properties and high temperature strength, their use can be extended to temperatures higher than 800
o
C. To increase.....
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Web of Science 1
Crossref 1
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박선영, 최한철
Korean J. Met. Mater.
2022;60(4):263-271. Published online 2022 Mar 28
DOI:
https://doi.org/10.3365/KJMM.2022.60.4.263
Abstract
The surface characteristics of a dental implant doped with Si, Mg, Ca, and P ions via plasma electrolytic oxidation (PEO) were investigated using various experimental instruments. Plasma electrolytic oxidation of the alloy was performed in a solution containing Ca, P, Si, and Mg ions at 280 V for 3 min......
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Web of Science 1
Crossref 1
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질소 5N 가스 분위기에서 다공질 ZrFe 합금의 산화 안정화
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김광배, 진새라, 임예솔, 이현준, 김성훈, 노윤영, 송오성
Korean J. Met. Mater.
2021;59(10):753-759. Published online 2021 Sep 6
DOI:
https://doi.org/10.3365/KJMM.2021.59.10.753
Abstract
A porous ZrFe alloy specimen was prepared as a 6 × 3 mm (diameter × thickness) disk. The reaction of the ZrFe alloy was confirmed while the whole system was maintained at a target temperature, which was increased from 150
o
C to 950
o
C in a 99.999% low purity nitrogen.....
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Korean J. Met. Mater.
2021;59(3):149-154. Published online 2021 Feb 19
DOI:
https://doi.org/10.3365/KJMM.2021.59.3.149
Abstract
In this study, an effective method is demonstrated for fabricating titanium sputtering targets, which are used to fabricate thin films in the semiconductor industry. The method is an alternative to the existing electron beam melting (EBM) process under high vacuum. Titanium sputtering targets used in the production of semiconductors must.....
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Web of Science 4
Crossref 4
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Korean J. Met. Mater.
2020;58(12):843-851. Published online 2020 Dec 4
DOI:
https://doi.org/10.3365/KJMM.2020.58.12.843
Abstract
In this study, oxide (Y
2
O
3
)-embedded Ni particles were fabricated via a new process. The process involves the mechanical hydrogenation of Ni–Y alloy into Ni–YH
2
and the selective oxidation of Ni–YH
2
to Ni–Y
2
O
3
. The alloy powders were prepared for sintering by the mechanical alloying of a mixed powder. The powder was.....
More
Web of Science 1
Crossref 2
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Korean J. Met. Mater.
2020;58(9):645-652. Published online 2020 Aug 13
DOI:
https://doi.org/10.3365/KJMM.2020.58.9.645
Abstract
Because of their simplicity and low equipment costs, various oxidation methods can be used to create metal oxides, but they still require long processing times and/or high temperatures. In this study, a new electrochemical oxidation (ECO) method, which oxidizes metal in DI water with a constant flowing current to both.....
More
Web of Science 2
Crossref 1
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Halide activated pack cementation에 의한 silicide 코팅층의 형성에 따른 Nb 합금의 산화거동
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양원철, 정중희, 이상엽, 백경호, 김영무, 이성, 박준식
Korean J. Met. Mater.
2020;58(8):507-514. Published online 2020 Aug 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.8.507
Abstract
In this study, we tried to improve the oxidation resistance of Nb-12Si (wt%) alloys at 1200 °C or higher through pack cementation coatings. Nb-12Si (wt%) alloys were prepared by arc-melting under Ar atmosphere. When the alloys were coated using pack powder mixtures composed of Si, Al
2
O
3
and NaF, two silicide.....
More
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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.....
More
Web of Science 6
Crossref 6
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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.....
More
Web of Science 3
Crossref 3
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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.....
More
Web of Science 2
Crossref 2
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Ti-44Al-6Nb-2Cr-0.3Si-0.1C 합금의 0.2%SO
2
/Ar가스에서의 고온부식
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Shi Yuke, Xiao Xiao, 김성웅, 홍재근, 한준희, 이동복
Korean J. Met. Mater.
2019;57(10):648-655. Published online 2019 Sep 23
DOI:
https://doi.org/10.3365/KJMM.2019.57.10.648
Abstract
Cast Ti–44Al–6Nb–2Cr–0.3Si–0.1C alloy having good air-oxidation resistance was corroded under 1 atm of flowing 0.2%SO
2
/Ar gas at 900-1100
o
C for 50-300 h in order to examine its corrosion behavior in a SO
2
-containing environment, because SO
2
is an industrially important by-product in the field of combustion and processing of fossil fuels......
More
Web of Science 1
Crossref 1
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Korean J. Met. Mater.
2019;57(9):575-581. Published online 2019 Aug 21
DOI:
https://doi.org/10.3365/KJMM.2019.57.9.575
Abstract
Alloys of Fe-12Cr-0.3C-4Mn-(13, 14, 15)Cu (wt%) were cast using an induction furnace. They were structurally heterogeneous composites that consisted of a relatively stiff α-Fe matrix and a soft (Cu, Mn)-rich secondary phase. They were developed as self-lubricating, wear-resistant metals. Since the formation of oxides plays an important role in wear,.....
More
Web of Science 4
Crossref 6
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Ti-6Al-4V합금에서 양극산화 공정변수가 TiO
2
나노튜브 형성에 미치는 영향
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유승연, 박현균
Korean J. Met. Mater.
2019;57(8):521-528. Published online 2019 Jul 11
DOI:
https://doi.org/10.3365/KJMM.2019.57.8.521
Abstract
To investigate the effect of anodic oxidation process parameters on TiO
2
nanotube formation in Ti-6Al-4V alloys, the composition of NH
4
F and H
2
O in the anodic oxidation processes were changed under the conditions of constant DC power ranging from 20 V to 60V and current density ranging from 10 mA to.....
More
Web of Science 4
Crossref 3
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Ni 및 Cu 첨가가 고온 산화된 자동차용 초고강도 강재의 부식 거동에 미치는 영향
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류승민, 성환구, 김정길, 황중기, 이만재, 오민석, 김성진
Korean J. Met. Mater.
2019;57(6):343-351. Published online 2019 May 16
DOI:
https://doi.org/10.3365/KJMM.2019.57.6.343
Abstract
The incomplete elimination of oxide scale formed during the normalizing process can result in severe degradation of the surface and mechanical properties of ultra-strong steels. This study revealed that the formation of oxide scale was highly dependent upon the alloying elements Ni and Cu. Ni-bearing steel showed a much higher.....
More
Web of Science 3
Crossref 2
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β
/B2상을 포함한 Ti-Al-Mo-Nb 합금의 산화 거동과 실리콘 화합물 코팅을 통한 내산화성 개선
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최광수, 송영범, 이승훈, 박준식
Korean J. Met. Mater.
2019;57(3):131-137. Published online 2019 Feb 8
DOI:
https://doi.org/10.3365/KJMM.2019.57.3.131
Abstract
Alloys containing the β/B2 phases of Ti-45Al-3Mo, Ti-45Al-3Mo-2Nb and Ti-45Al-5Mo were prepared using an vacuum arc-melting machine. Heat-treatments were carried out at 1250 oC in an Ar atmosphere. The temperature of 1250 oC is the temperature region of phase α + γ + (β/B2), and the heat treatment condition which.....
More
Web of Science 2
Crossref 2
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Korean J. Met. Mater.
2018;56(12):900-909. Published online 2018 Dec 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.12.900
Abstract
A ZnO/TiO2 photocatalyst decorated with PbS quantum dots (QDs) was synthesized to achieve high photocatalytic efficiency for the decomposition of dye in aqueous media. A TiO2 porous layer, as a precursor photocatalyst, was fabricated using micro-arc oxidation, and exhibited irregular porous cells with anatase and rutile crystalline structures. Then, a.....
More
Crossref 11
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Korean J. Met. Mater.
2018;56(5):350-359. Published online 2018 May 8
DOI:
https://doi.org/10.3365/KJMM.2018.56.5.350
Abstract
When 2.25Cr-1Mo steel was hot-dip aluminized, a coating consisting of (Al-rich topcoat)/(Al
13
Fe
4
layer)/(Al
5
Fe
2
layer) formed. With increment of oxidation temperature, the transform of Al→Al
13
Fe
4
→Al
5
Fe
2
→AlFe→AlFe
3
→α-Fe(Al)→α-Fe occurred through interdiffusion between the coating and the substrate as follows. The oxidation at 700
o
C changed the coating to (α-Al
2
O
3
scale)/(α-Al
2
O
3
, Al
13
Fe
4
, Al
5
Fe
2
)-mixed layer)/(Al
5
Fe
2
layer)/(AlFe.....
More
Crossref 2
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Korean J. Met. Mater.
2018;56(4):272-279. Published online 2018 Apr 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.4.272
Abstract
Cr
25.2
Al
19.5
Si
4.7
N
50.5
thin films were deposited on steel substrates by cathodic arc plasma deposition. They consisted of alternating
fcc
-Cr(Al)N/hcp-Al(Cr,Si)N nanolayers. They were corroded at 900 and 1000
o
C for 5-100 h in N
2
/0.1%H
2
S gas atmosphere. Their corrosion mechanism, the structure of the formed scales, and the role of film-constituting elements during.....
More
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Korean J. Met. Mater.
2018;56(3):205-209. Published online 2018 Mar 6
DOI:
https://doi.org/10.3365/KJMM.2018.56.3.205
Abstract
The optimum acid cleaning conditions for removing CaO formed by the reaction of Ca with Ti powder were investigated in this study. In this experiment, we used Ti powders composed of irregular polygonal Ti particles with average sizes of 125 mm and 250 μm. Ca granules were charged at 50%.....
More
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Fe-Mn-Al-Si-Sb-C 강의 고온산화에 미치는 Mn, Si, Sb 첨가효과
S
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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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마그네슘 합금의 플라스마전해산화 코팅에 영향을 미치는 제반 요소들에 대한 고찰
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심건주
Korean J. Met. Mater.
2017;55(5):296-307. Published online 2017 May 9
DOI:
https://doi.org/10.3365/KJMM.2017.55.5.296
Abstract
Magnesium alloys, which possess excellent specific strength and castability, are highly susceptible to corrosion. Although anodizing is widely used to resolve this problem, it requires toxic electrolytes and produces relatively thin and weak surface coatings. Recently, plasma electrolytic oxidation (PEO) has emerged as an alternative to anodizing. Although it is...
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Crossref 7
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세륨 인산염계 유리에서 세륨의 산화수와 촉매특성에 대한 용융조건의 영향
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김주형, 김대성, 류봉기
Korean J. Met. Mater.
2017;55(2):144-149. Published online 2017 Feb 2
DOI:
https://doi.org/10.3365/KJMM.2017.55.2.144
Abstract
As with any solvent, stabilizing a multivalent element at a given oxidation level in the glass depends on the thermodynamic conditions. The effects of temperature in the oxidation-reduction equilibrium have been previously noted with higher temperatures being conductive to reduced states. 30Ce
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O-70P
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binary system glasses were prepared. The effects of.....
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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
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, respectively, at grain boundaries. Ca increased the oxidation resistance by forming a.....
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Crossref 2
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