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Korean J. Met. Mater.
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가솔린 터보차저용 Alloy1.4957 내열강의 석출 상 분석
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이종관, 이병주, 이언식
Korean J. Met. Mater.
2023;61(10):721-728. Published online 2023 Sep 25
DOI:
https://doi.org/10.3365/KJMM.2023.61.10.721
Abstract
Recently, strengthened environmental regulations have required the downsizing of gasoline engines, and as a result, demand for gasoline turbochargers has rapidly increased. The vane of a turbocharger controls the flow of gases toward the turbine, and it is manufactured by powder metallurgy due to its complex shape. Gasoline engines have.....
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X-선 회절을 통한 적층제조 A356.2 알루미늄 합금의 잔류응력 분석
[corrected-article]
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박상철, 김인영, 김영일, 김대겸, 오승주, 이기안, 이빈
Korean J. Met. Mater.
2023;61(7):534-544. Published online 2023 Jun 21
DOI:
https://doi.org/10.3365/KJMM.2023.61.7.534
Abstract
The physical properties of metal-based structural materials, such as hardness, strength and toughness, are directly or indirectly affected by residual stress inside or on the surface of the given part. Repeated rapid heating and cooling during the additive manufacturing process causes thermal gradients and expansion and contraction in the material,.....
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Web of Science 1
Crossref 1
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Powder Bed Fusion(PBF) 공정의 Laser rotation 적용 여부에 따른 17-4PH 스테인리스강 소재의 미세조직 및 기계적 특성 변화
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이승호, 윤종천, 어두림, 연시모, 최균석
Korean J. Met. Mater.
2023;61(6):397-403. Published online 2023 May 18
DOI:
https://doi.org/10.3365/KJMM.2023.61.6.397
Abstract
17-4 precipitation hardened stainless steel (17-4PH SS) has been reported to have excellent mechanical properties and excellent corrosion resistance, and is one of the materials used and studied with the powder bed fusion (PBF) method. Powder bed fusion (PBF) is a new manufacturing technology that has recently attracted attention in.....
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Korean J. Met. Mater.
2023;61(5):330-337. Published online 2023 Apr 20
DOI:
https://doi.org/10.3365/KJMM.2023.61.5.330
Abstract
The effect of TiO
2
additive concentration and sintering temperatures on the densification of alumina (Al
2
O
3
) ceramics were investigated. Densified alumina specimens were prepared by uniaxial pressing at a pressure of 60 MPa followed by isothermal heating at either 1400, 1500, or 1600 o C for 2 h. The relative.....
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Crossref 1
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분말 사출 성형된 Fe-Cr-B/316L 스테인레스강 복합재료의 미세조직과 기계적 특성에 미치는 Fe-Cr-B의 영향
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김영균, 주연아, 윤태식, 이기안
Korean J. Met. Mater.
2023;61(1):9-17. Published online 2022 Dec 28
DOI:
https://doi.org/10.3365/KJMM.2023.61.1.9
Abstract
Stainless steel-based composites (SMCs) mixed with 316L stainless steel powder and Fe-Cr-B based M alloys powder ed M) powder were manufactured using the powder injection molding (PIM) process, and their microstructure and mechanical properties were investigated. To examine the effect of M content on the properties of SMCs, the M.....
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Korean J. Met. Mater.
2022;60(7):551-556. Published online 2022 Jun 3
DOI:
https://doi.org/10.3365/KJMM.2022.60.7.551
Abstract
High quality Hg
2
Br
2
crystal grown
via
the physical vapor transport (PVT) process is essential for the fabrication of the acousto-optic tunable filters (AOTFs) module. The full process flow, including powder purification and crystal growth, should be systematically established, but there have been few reports about the fully established process flow.....
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Web of Science 3
Crossref 3
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Korean J. Met. Mater.
2021;59(6):357-364. Published online 2021 May 26
DOI:
https://doi.org/10.3365/KJMM.2021.59.6.357
Abstract
W-containing Ti-6Al-4V alloys (W=0, 1, and 5 wt%) were fabricated by the powder injection molding process, and the corresponding effects of tungsten content on the mechanical properties and microstructure of the alloys were investigated. The alloy powders were sintered at 1200 °C and then hot-isostatically-pressed at 900 °C. The fabricated.....
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Web of Science 3
Crossref 4
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방전플라즈마 소결법에 의해 제조된 Cu-Ni-Zr-Ti 비정질 기지 복합재료의 미세조직 및 기계적 특성
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신다운, 민 홍, 이진규
Korean J. Met. Mater.
2021;59(5):281-288. Published online 2021 Apr 6
DOI:
https://doi.org/10.3365/KJMM.2021.59.5.281
Abstract
In the present study, Cu
54
Ni
6
Zr
22
Ti
18
bulk metallic glass composites were developed by spark plasma sintering(SPS) using gas atomized Cu
54
Ni
6
Zr
22
Ti
18
metallic glass powders and Ta powders. Metallic glass composites with Ta phase were fabricated by SPS. The successful consolidation of Cu
54
Ni
6
Zr
22
Ti
18
metallic glass matrix composites with the Ta phase was achieved.....
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Web of Science 1
Crossref 2
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전용민, 권진구, 유시홍, 이영철, 이성의
Korean J. Met. Mater.
2021;59(3):195-200. Published online 2021 Feb 19
DOI:
https://doi.org/10.3365/KJMM.2021.59.3.195
Abstract
Zinc oxide is transparent inorganic UV absorber and widely used as a sunscreen. But sunscreen on the skin is easily erased by sebum, so zinc oxide with a sebum curing function was studied. In this study, a zinc oxide powder was prepared using zinc chloride and sodium hydroxide via a.....
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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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조영상, 성소현, 우승희, 김영석
Korean J. Met. Mater.
2021;59(2):99-112. Published online 2021 Feb 5
DOI:
https://doi.org/10.3365/KJMM.2021.59.2.99
Abstract
In this study, silica aerogel particles were synthesized from emulsion droplets as micro-reactors at room temperature under ambient pressure. An economical precursor, sodium silicate, was used as the starting material for silica, and an emulsification technique was applied to form droplets in continuous phase. By controlling the composition of the...
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Web of Science 6
Crossref 6
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소결기 장입을 위한 미분광브리켓 제조에 대한 연구
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배종호, 김강민, 이경욱, 한정환
Korean J. Met. Mater.
2021;59(1):14-20. Published online 2021 Jan 5
DOI:
https://doi.org/10.3365/KJMM.2021.59.1.14
Abstract
In ironmaking, the optimal size of the iron ore charged into a blast furnace is generally 10-30 mm. Oversized ores, which have a smaller reaction surface area, are crushed, while undersized ores, which decrease permeability, undergo a sizing process before being charged into the blast furnace. Recently, however, iron ore.....
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Web of Science 3
Crossref 2
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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.....
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Web of Science 4
Crossref 4
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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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Web of Science 5
Crossref 4
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분말 합금법 및 고온 압연 공정으로 제조된 대형 블록 Ni-Cr-Al 초합금 다공체의 기계적 특성 비대칭성
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김규식, 심민철, 박만호, 윤중열, 이기안
Korean J. Met. Mater.
2020;58(2):103-111. Published online 2020 Jan 8
DOI:
https://doi.org/10.3365/KJMM.2020.58.2.103
Abstract
A block Ni-Cr-Al superalloy foam with dimensions of 300 mm (width direction, WD) × 500 mm (rolling direction, RD) × 60 mm (normal direction, ND) was fabricated using powder alloying, multi-sheet stacking, and hot rolling processes. The structural characteristics, microstructure, and mechanical asymmetry of the block Ni-based foam were investigated......
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생체의료 임플란트용 개기공 티타늄 다공체 제조
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김경욱, 장진만, 김용대, 이재철, 이원식
Korean J. Met. Mater.
2019;57(10):679-687. Published online 2019 Sep 6
DOI:
https://doi.org/10.3365/KJMM.2019.57.10.679
Abstract
Open-pored metal foams have been partly used for orthopedic or dental applications because of their good bone ingrowth behavior and low elastic modulus. In this paper, we report a method that can produce open-pored Ti foams using a technique that combines the powder injection molding process and feedstocks containing expandable.....
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Web of Science 3
Crossref 3
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Korean J. Met. Mater.
2019;57(8):529-534. Published online 2019 Jul 11
DOI:
https://doi.org/10.3365/KJMM.2019.57.8.529
Abstract
A Cu composite reinforced by a three-dimensionally interconnected graphene network was synthesized in situ by a simple two-step process utilizing compacted Cu powder (99% purity) as a template for the growth of graphene. Cu composites with different graphene contents were obtained by controlling the processing parameters. The composites were approximated.....
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Web of Science 6
Crossref 6
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Korean J. Met. Mater.
2019;57(2):115-123. Published online 2019 Jan 9
DOI:
https://doi.org/10.3365/KJMM.2019.57.2.115
Abstract
The compression process is one of the more widely used industrial manufacturing methods for fabricating desired shape of specimens with various materials such as metals and ceramics. In the compaction process, the upper punch moves into the powder, and force is transmitted between particles, then achieving densification. In this process,.....
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Powder Injection Molding 공정으로 제조된 17-4PH 강과 Fe-Cr-B 합금 복합 소재의 미세조직 및 기계적 특성
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주연아, 김영균, 윤태식, 이기안
Korean J. Met. Mater.
2018;56(5):342-349. Published online 2018 May 8
DOI:
https://doi.org/10.3365/KJMM.2018.56.5.342
Abstract
This study investigated the microstructure and mechanical properties of 17-4PH precipitation hardened martensite stainless steel and Fe-Cr-B based alloy mixed material manufactured using powder injection molding. 17-4PH stainless steel powder was mixed with 5 wt%, 10 wt% and 20 wt% Fe-Cr-B based alloy (M alloy) powder to manufacture three different.....
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Crossref 5
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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%.....
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분말소재 특성에 따른 고속화염용사 WC-12Co 코팅층의 미세조직 및 침식 저항성
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강소영, 백경호, 윤상훈, 김형준
Korean J. Met. Mater.
2018;56(2):113-120. Published online 2018 Feb 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.2.113
Abstract
WC-Co coatings manufactured by high velocity oxy-fuel (HVOF) spraying have a superior hardness and wear resistance. In this study, HVOF-sprayed WC-12Co coatings from three different feedstock powders were evaluated in terms of microstructural features, carbide decomposition and erosion resistance. The fused-crushed and the sintered-crushed WC-12Co powders had an angular shape,.....
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Crossref 1
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다공성 소결 순철에서 인장연성의 변화에 관한 연구
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정재영, 손호상
Korean J. Met. Mater.
2018;56(1):34-39. Published online 2018 Jan 1
DOI:
https://doi.org/10.3365/KJMM.2018.56.1.34
Abstract
A model based on Irwin's approach to elastic-plastic deformation was applied to predict the tensile ductility of a sintered iron. The evaluation of this model using experimental results for porous sintered iron showed that tensile ductility depends not only on the pore volume fraction, but also the pore size and.....
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장입 슈트 형태에 따른 소결 원료 장입 거동
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김강민, 이기우, 권재홍, 정해권, 한정환
Korean J. Met. Mater.
2017;55(12):896-904. Published online 2017 Dec 4
DOI:
https://doi.org/10.3365/KJMM.2017.55.12.896
Abstract
In the iron ore sintering process, a thermal imbalance can occur in the sinter feed bed which degrades the quality of the sintered ores. In order to solve this thermal imbalance, it is necessary to control the sizes of the sintering feed charging through the chute by designing an appropriate.....
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유한요소법에 의한 수학적 모델링을 활용한 준-나노 Cu
x
Ni
y
Zn
1-x-y
Fe
2
O
4
페라이트 연소합성
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구문선, 최용
Korean J. Met. Mater.
2017;55(11):777-782. Published online 2017 Oct 31
DOI:
https://doi.org/10.3365/KJMM.2017.55.11.777
Abstract
Numerical modeling of the self-propagating high temperature synthesis (SHS) of Cu
x
Ni
y
Zn
1-x-y
Fe
2
O
4
ferrites was carried out using the finite element method, to control the combustion synthesis behaviors of the ferrites. Additional pre-heating above 300 ℃ caused the combustion temperature at the inner surface of the reactant compact to completely propagate the.....
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가스분무법으로 제조된 Al 합금분말의 펄스통전 소결체의 특성평가
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박현국, 장준호, 이정한, 오익현
Korean J. Met. Mater.
2017;55(10):703-709. Published online 2017 Sep 28
DOI:
https://doi.org/10.3365/KJMM.2017.55.10.703
Abstract
In this study, Al alloy targets were fabricated using the powder metallurgy (pulsed current activated sintering, PCAS) process for metal PVD coating target applications. Powders were prepared from Al, Si and Cu ingots for sintering Al alloy compacts using the gas atomizing process. To fabricate the gas atomized Al alloy.....
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퍼멀로이 분말이 혼합된 철계 나노결정립 분말코어의 성형밀도와 연자성 특성에 관한 연구
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신정훈, 정영목, 손근용, 박원욱
Korean J. Met. Mater.
2017;55(9):645-650. Published online 2017 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2017.55.9.645
Abstract
In this paper, the soft magnetic properties and compaction density of Fe-Si-B-Nb-Cu nanocrystalline powder cores, mixed with two kinds of permalloy powders (Ni
70
Fe
30
or Ni
50
Fe
50
), have been closely studied. Permalloy powders having an average diameter of 4
μ
m were added in the range of 5 to 15 wt%, and the powder.....
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침입형 탄소 확산을 이용하여 제조한 고강도 Ti 합금
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김보영, 고세현, 이재철
Korean J. Met. Mater.
2017;55(5):342-347. Published online 2017 May 9
DOI:
https://doi.org/10.3365/KJMM.2017.55.5.342
Abstract
Feasibility studies are performed to determine the suitability of a novel simple synthesis technique for fabricating a new Ti alloy with improved strength and ductility, while exhibiting lower cell toxicity. Through consolidating pure Ti powders under a C atmosphere at elevated temperatures, a bulk form of the Ti alloy, in.....
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Crossref 1
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철계 비정질/나노 결정 하이브리드 소재의 연자성 특성
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이연주, 전종규, 장태석, 이민우, 김용진, 양동열, 이미정, 최현주
Korean J. Met. Mater.
2017;55(5):328-334. Published online 2017 May 9
DOI:
https://doi.org/10.3365/KJMM.2017.55.5.328
Abstract
In this study, the effect of the crystalline structure on the magnetic properties of Fe-based amorphous powder is investigated. The Fe-B-P-C-Nb-Hf amorphous powder with excellent soft magnetic properties is prepared via gas-atomization, and the atomized amorphous powder is annealed in order to generate a small amount of nanosized crystallites in.....
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Crossref 3
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WC-Co 초고속 화염용사코팅 표면특성에 미치는 분말입자의 크기
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조동율, 윤재홍, 윤상환, 주윤곤, 최원호, 손영복
Korean J. Met. Mater.
2017;55(4):227-231. Published online 2017 Apr 6
DOI:
https://doi.org/10.3365/KJMM.2017.55.4.227
Abstract
The effects of particle size on the surface properties of HVOF spray coating were studied to improve of the durability of metal components. Micro and nano sized WC-12Co powders were coated on the surface of Inconel718, and the effects of particle size on surface properties were studied. Surface hardness was.....
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Crossref 5
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우라늄 분말 입자크기에 따른 Zr-U 금속연료의 성형 및 소결 미세조직의 영향
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윤창근, 전현준, 주정환, 이호진, 이종탁, 김형래
Korean J. Met. Mater.
2017;55(3):184-190. Published online 2017 Mar 3
DOI:
https://doi.org/10.3365/KJMM.2017.55.3.184
Abstract
In case of the uranium (U) and zirconium (Zr) powders which have been utilized for the production of a metallic fuel in the various nuclear applications, the homogenous distribution of U powders in the Zr-U pellet has influenced significantly on the nuclear fuel performance. The inhomogeneity in a powder process.....
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