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Hydrogen Storage Properties of Mg-Graphene Composites
Myoung Youp Song, Young Jun Kwak, Eunho Choi
Korean J. Met. Mater. 2018;56(7):524-531.   Published online 2018 Jul 5
DOI: https://doi.org/10.3365/KJMM.2018.56.7.524

Abstract
To improve the hydrogen uptake and release properties of magnesium (Mg), five weight percent of graphene was added to pre-milled Mg by milling in hydrogen (reaction-involving milling). The hydrogen uptake and release properties of the graphene-added Mg (named Mg-5graphene) were investigated. Premilling of Mg (for 24 h) and then adding..... More

                           Cited By 4
Effects of Direct Current on the Wetting between Molten Al and a Graphite Substrate
In-Jin Shon
Korean J. Met. Mater. 2018;56(7):505-510.   Published online 2018 Jul 5
DOI: https://doi.org/10.3365/KJMM.2018.56.7.505

Abstract
Graphite fiber attracted much attention in the area of aluminum based composite due to its low density and high strength. However, one of the major drawbacks in fabricating graphite reinforced metal matrix composites (MMCs) is that aluminum generally does not wet graphite. Therefore, it is difficult to impregnate the graphite..... More

                        
Phase-field Modeling of Precipitate Behavior in RPV Steel Using CALPHAD Database
Kunok Chang, Junhyun Kwon, Gyeong-Geun Lee
Korean J. Met. Mater. 2018;56(6):472-478.   Published online 2018 Jun 4
DOI: https://doi.org/10.3365/KJMM.2018.56.6.472

Abstract
We developed a multi-scale modeling framework using the thermodynamic UW1 database of the Fe-Mn-Ni-Si quaternary system. To obtain input data for the phase-field model, such as mobility and interfacial energy data, we used DICTRA software and the TC-PRISMA package with the commercial TCFE8 and MOBFE3 databases. Using the developed framework,..... More

                        
Thermoelectric Properties of Partially Double-filled (Ce1-zNdz)yFe4-xCoxSb12 Skutterudites
Ye-Eun Cha, Il-Ho Kim
Korean J. Met. Mater. 2018;56(6):465-471.   Published online 2018 Jun 4
DOI: https://doi.org/10.3365/KJMM.2018.56.6.465

Abstract
(Ce1-zNdz)yFe4-xCoxSb12 skutterudites were prepared by encapsulated melting, annealing, and hot pressing. The formation of a marcasite phase (FeSb2) was significantly suppressed by partially filling the voids with Ce/Nd and making a Co substitution at the Fe site. Both the Hall and the Seebeck coefficient values were positive, indicating that all..... More

                           Cited By 3
Effect of Via Pitch on the Extrusion Behavior of Cu-filled TSV
Seho Kee, Wonjoong Kim, Jaepil Jung, Minhyung Choi
Korean J. Met. Mater. 2018;56(6):449-458.   Published online 2018 Jun 4
DOI: https://doi.org/10.3365/KJMM.2018.56.6.449

Abstract
In this study, the extrusion behavior of Cu fill material in a through-Si-via (TSV) subjected to thermal loading was investigated. The Cu filling of the TSV was accomplished using pulse periodic reverse (PPR) electroplating. To study the extrusion, TSVs of varying via pitch were filled with Cu by electroplating. Defect-free Cu..... More

                           Cited By 1
Evaluations of Hydrogen Permeation on Ni-SCYb Nano-Composites Membrane by Sol-Gel Methods
Min Gyeom Kim, Tae Whan Hong
Korean J. Met. Mater. 2018;56(5):406-411.   Published online 2018 May 8
DOI: https://doi.org/10.3365/KJMM.2018.56.5.406

Abstract
Industrially meaningful hydrogen production process from mixture or syngas certainly must have a cooling process, which is typically pressure swing adsorption (PSA). However, the PSA process involves an exothermic reaction during adsorption. Recently, hydrogen separation research has been in progress in order to develop a cooling process to minimize or..... More

         Cited By 1
A Study of Silicon Crystallization Dependence upon Silicon Thickness in Aluminum-induced Crystallization Process
Doo Won Lee, Muhammad Fahad Bhopal, Soo Hong Lee
Korean J. Met. Mater. 2018;56(5):400-405.   Published online 2018 May 8
DOI: https://doi.org/10.3365/KJMM.2018.56.5.400

Abstract
Aluminum-induced crystallization(AIC) is one of the ways to improve characteristics of thin-film poly-crystalline (TFPC) silicon solar cell since it shows large grain size and good properties for TFPC silicon solar cell. In AIC process, aluminum is firstly deposited on foreign substrate. Then, silicon is deposited on aluminum. Annealing was done..... More

      
Development of a Mg-Based Alloy with a Hydrogen-Storage Capacity of 7 wt% by Adding a Polymer CMC via Transformation-Involving Milling
Myoung Youp Song, Eunho Choi, Young Jun Kwak
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

         Cited By 4
Modification of the Amount of CH4 Supplied for the Efficient CH4 Reduction of SnO2
Taeyang Han, Youhan Sohn, Hyunwoo Ha, Mi Yoo, Sangyeol Kim, Sang-ro Lee, Hyun You Kim, Jun Hyun Han
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 SnO2 has been proposed as a highly efficient method for recovering Sn from SnO2 containing industrial wastes. The MR of SnO2 also produces a mixture of H2 and CO, which can be further utilized as a syngas for the production of various fuels through the..... More

      
Effect of Sn Content on Filler and Bonding Characteristics of Active Metal Brazed Cu/Al2O3 Joint
Jioh Shin, Ashutosh Sharma, Do-hyun Jung, Jae Pil Jung
Korean J. Met. Mater. 2018;56(5):366-374.   Published online 2018 May 8
DOI: https://doi.org/10.3365/KJMM.2018.56.5.366

Abstract
This study examined the effects of the Sn content in a pure active metal filler Ag-Cu-Ti for the brazing of a Cu/ Al2O3 joint. The optimal content of Sn to effectively wet alumina was 5 wt%. The microstructure of the brazed joint showed the presence of an Ag-rich matrix and..... More

         Cited By 1
High-temperature Oxidation of Hot-dip Aluminized 2.25Cr-1Mo Steel
Muhammad Ali Abro, Junhee Hahn, Dong Bok Lee
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)/(Al13Fe4 layer)/(Al5Fe2 layer) formed. With increment of oxidation temperature, the transform of Al→Al13Fe4→Al5Fe2→AlFe→AlFe3→α-Fe(Al)→α-Fe occurred through interdiffusion between the coating and the substrate as follows. The oxidation at 700 oC changed the coating to (α-Al2O3 scale)/(α-Al2O3, Al13Fe4, Al5Fe2)-mixed layer)/(Al5Fe2 layer)/(AlFe..... More

         Cited By 1
Enhanced Electrical Properties and Stability of Solution-processed Amorphous Oxide Thin Film Transistors with Multi-active Layers
Won Seok Choi, Byung Jun Jung, Myoung Seok Kwon
Korean J. Met. Mater. 2018;56(4):304-312.   Published online 2018 Apr 5
DOI: https://doi.org/10.3365/KJMM.2018.56.4.304

Abstract
We investigated the electrical properties and gate bias stress stability of solution-processed amorphous oxide thin film transistors (TFTs) with multi-stacked active layers. With the multi-layered InZnO (In:Zn = 1:1), mobility was increased from 4.6 to 21.2 cm2V-1s-1 and the subthreshold swing (SS) was improved from 0.71 to 0.54 V/decade compared..... More

      
High-temperature Corrosion of CrAlSiN Thin Films in N2/0.1%H2S Gas
Muhammad Ali Abro, Junhee Hahn, Dong Bok Lee
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
Cr25.2Al19.5Si4.7N50.5 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 oC for 5-100 h in N2/0.1%H2S gas atmosphere. Their corrosion mechanism, the structure of the formed scales, and the role of film-constituting elements during..... More

      
Comparison of the Hydrogen Release Properties of Zn(BH4)2-Added MgH2 Alloy and Zn(BH4)2 and Ni-Added MgH2 Alloy
Myoung Youp Song, Young Jun Kwak
Korean J. Met. Mater. 2018;56(3):244-251.   Published online 2018 Mar 6
DOI: https://doi.org/10.3365/KJMM.2018.56.3.244

Abstract
Samples with compositions of 99 w/o MgH2+1 w/o Zn(BH4)2 (designated MgH2-1Zn(BH4)2) and 96 w/o MgH2+2 w/o Zn(BH4)2+2 w/o Ni (designated MgH2-2Zn(BH4)2-2Ni) were prepared by milling in a planetary ball mill in a hydrogen atmosphere (reaction-involving milling). The hydrogen release properties of MgH2- 1Zn(BH4)2 and MgH2-2Zn(BH4)2-2Ni were compared. A larger quantity..... More

      
Bridge Burst Characteristics of Aluminum and Copper Thin-Film Bridges in Electrical Initiation Devices
Kyoungjin Kim, Kyu-Hyoung Kim, Seung-gyo Jang
Korean J. Met. Mater. 2018;56(3):235-243.   Published online 2018 Mar 6
DOI: https://doi.org/10.3365/KJMM.2018.56.3.235

Abstract
The optimal design of electrical initiation devices for explosive charges and other high energy materials critically depends on the bridge burst or the electrical explosion of the thin-film metallic bridges. It is therefore quite important to select the right material with suitable explosion properties for the metallic bridge film. However,..... More

      
Efficacy of Acid Cleaning on the Deoxidation of Titanium Powder Using Calcium
Chon-Il Hong, Jae-Won Lim
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

      
Hydrogen Absorption and Release Properties of MgH2, Mg2Ni, and Ni-Added Mg via Reactive Mechanical Grinding
Seong-Hyeon Hong, Myoung Youp Song
Korean J. Met. Mater. 2018;56(2):155-162.   Published online 2018 Feb 5
DOI: https://doi.org/10.3365/KJMM.2018.56.2.155

Abstract
In this work, MgH2, Mg2Ni, and Ni were added to Mg in order to improve the hydrogen-storage properties of Mg. A 84 wt% Mg + 10 wt% MgH2 + 5 wt% Mg2Ni + 1 wt% Ni sample (designated the Mg-based sample) was prepared by milling under a hydrogen atmosphere in..... More

      
Charge Transport and Thermoelectric Properties of P-type Bi2-xSbxTe3 Prepared by Mechanical Alloying and Hot Pressing
Kyung-Wook Jang, Hyeok-Jin Kim, Woo-Jin Jung, Il-Ho Kim
Korean J. Met. Mater. 2018;56(1):66-71.   Published online 2018 Jan 1
DOI: https://doi.org/10.3365/KJMM.2018.56.1.66

Abstract
Bi2-xSbxTe3 (x = 1.4–1.7) solid solutions were synthesized by mechanical alloying (MA) and consolidated by hot pressing (HP), and their charge transport and thermoelectric properties were examined. The relative densities of the hot-pressed specimens were higher than 96% on average. As the Sb content was increased, the lattice constants decreased,..... More

      
Enhancement of the Hydrogen-Storage Characteristics of Mg by Adding Mg2Ni and Ni to MgH2 via High Energy Ball Milling in Hydrogen Atmosphere
Seong-Hyeon Hong, Young Jun Kwak, Myoung Youp Song
Korean J. Met. Mater. 2018;56(1):59-65.   Published online 2018 Jan 1
DOI: https://doi.org/10.3365/KJMM.2018.56.1.59

Abstract
In this work, Mg2Ni and Ni were added to MgH2 in order to improve the hydrogen-storage properties of Mg. A 94 wt% MgH2+5 wt% Mg2Ni+1wt% Ni (named 94MgH2+5Mg2Ni+1Ni) sample was prepared by milling in a hydrogen atmosphere in a planetary ball mill for 5 h. The Mg2Ni was hydrided during..... More

         Cited By 4
Recovery of Fine Aluminum Hydroxide with High Whiteness Index from Low Quality Bauxite Using Caustic Roasting and Water Leaching
Su Jin Kim, Jeong Il Lee, Kyu Sung Han, So Yeong Byun, Tam Tran, Myong Jun Kim
Korean J. Met. Mater. 2018;56(1):49-58.   Published online 2018 Jan 1
DOI: https://doi.org/10.3365/KJMM.2018.56.1.49

Abstract
A bauxite of low quality containing 6.75% reactive silica and 37.4% Al2O3 as gibbsite was roasted with additives including NaOH (caustic/total alumina molar ratio of 2-4:1) and CaO (CaO/total SiO2 molar ratio of 0.5-3:1) at 300-1000 oC, producing calcines containing sodium aluminate (Na2O.Al2O3), silicates and hematite. Optimum conditions included roasting..... More

         Cited By 1
Study on the Water Durability of Molybdate Glasses with B2O3 as Low Temperature Sealing Materials
Jae-Young Shin, Jae-Min Cha, Dae-Sung Kim, Dea-Geol Jeong, Jun-Hyeon Bae, Bong-Ki Ryu
Korean J. Met. Mater. 2017;55(12):905-910.   Published online 2017 Dec 4
DOI: https://doi.org/10.3365/KJMM.2017.55.12.905

Abstract
The boron alkali molybdate glass system was investigated as lead-free low-temperature melting sealing materials, with different boron oxide contents between 0 and 8 mol%. The glasses were characterized using X-ray diffraction (XRD), differential scanning calorimetry (DSC), infrared spectroscopy (IR), and by densities. Their chemical properties were measured by their dissolution..... More

      
AISI 304 Steel Brazing Using A Flexible Brazing Foil Fabricated by Tape Casting Method
Ashutosh Sharma, Soon-Jae Lee, Joo-Hee Oh, Jae Pil Jung
Korean J. Met. Mater. 2017;55(12):836-844.   Published online 2017 Dec 4
DOI: https://doi.org/10.3365/KJMM.2017.55.12.836

Abstract
The authors report the fabrication of a flexible nickel brazing foil using powdered nickel alloy filler (BNi-2) mixed with an organic binder. The organic binder was composed of a polyacrylic acid polymer, glycol, carbon tetrachloride, and water as a dispersion medium for the powder. The brazing paste so formed was..... More

      
Role of Voltage and Gas Pressure in Determining the Mean Diameter of Sn-Bi-Ag Intermetallic Compound Nanoparticles Formed by Pulsed Wire Discharge
Dae Geol Jeong, Jae Min Cha, Dae Sung Kim, Ju Hyeong Kim, Hwa Jin Jeong, Jae Young Shin, Jun Hyeon Bae, Bong Ki Ryu, Hisayuki Suematsu, Kenta Tanaka
Korean J. Met. Mater. 2017;55(11):806-812.   Published online 2017 Oct 31
DOI: https://doi.org/10.3365/KJMM.2017.55.11.806

Abstract
Nanoscale Sn-Bi-Ag compound powders were successfully synthesized using the pulsed wire discharge (PWD) method. In PWD, when a high current is passed through high-density metal wires, the wires explode because of resistance heating, forming fine particles or metal vapor. In this study, we used Sn-Bi and Ag wires in order..... More

      
Pulsed Electrodeposition of Thin Cobalt Coating Layer on Ferritic Stainless Steel for SOFC Interconnects
Suk-Chul Kwak, Byung Kyu Kim, Dong-Ik Kim, Young Whan Cho
Korean J. Met. Mater. 2017;55(11):768-776.   Published online 2017 Oct 31
DOI: https://doi.org/10.3365/KJMM.2017.55.11.768

Abstract
A thin, compact, and uniform cobalt layer was coated on ferritic stainless steel (Crofer 22 APU) by high frequency square pulsed electrodeposition in an aqueous solution containing cobalt chloride and boric acid. The effects of various electrodeposition parameters and post heat treatment on the morphology, thickness, roughness and adhesion of..... More

      
Material Characterization of Single Crystalline Cu Subjected to High Strain Rates and High Temperatures for Multiscale Simulation
Yujin Seong, Youngkyu Kim, Im Doo Jung, Sungho Kim, See Jo Kim, Seong-Gon Kim, Hak Jun Kim, Seong Jin Park
Korean J. Met. Mater. 2017;55(11):760-767.   Published online 2017 Oct 31
DOI: https://doi.org/10.3365/KJMM.2017.55.11.760

Abstract
The material characterization of single crystalline Cu columns was numerically carried out at the submicroscopic level. A molecular dynamics (MD) simulation was employed using the embedded-atom method (EAM) interatomic potential between a pair of Cu atoms to describe the interactions among Cu atoms. First, the relationship between mechanical properties and..... More

         Cited By 1
Separation of Rhenium (VII) and Vanadium (V) from Hydrochloric Acid Solutions by Solvent Extraction
Thi Hong Nguyen, Hoai Thanh Truong, Man Seung Lee
Korean J. Met. Mater. 2017;55(10):724-731.   Published online 2017 Sep 28
DOI: https://doi.org/10.3365/KJMM.2017.55.10.724

Abstract
The separation of Re(VII) and V(V) by solvent extraction with TBP was investigated by varying the HCl, metal and chloride ion concentrations. Re(VII) was selectively extracted over V(V) from the HCl solution. The highest separation between Re(VII) and V(V) occurred at a concentration of 2.0 M HCl. The extraction reaction..... More

      
Inhomogeneous Deformation of Interstitial Free Steel during the High Pressure Torsion Process
Yuepeng Song, Miaomiao Chen, Wenke Wang, Baoyan Xu, Dongsheng Gao, Shuai Zhang, Hyoung Seop Kim
Korean J. Met. Mater. 2017;55(10):710-715.   Published online 2017 Sep 28
DOI: https://doi.org/10.3365/KJMM.2017.55.10.710

Abstract
Interstitial free (IF) steel disks were subjected to various degrees of revolution during application of the high-pressure torsion (HPT) process, and the resulting distributions of hardness and microstructure during the early torsion stage of high-pressure torsion (HPT) were investigated using experimental and simulation approaches. The results indicated that the deformation..... More

      
Increase in the Hydrogen-Sorption Rates and the Hydrogen-Storage Capacity of MgH2 by Adding a Small Proportion of Zn(BH4)2
Hye Ryoung Park, Young Jun Kwak, Myoung Youp Song
Korean J. Met. Mater. 2017;55(9):657-663.   Published online 2017 Aug 30
DOI: https://doi.org/10.3365/KJMM.2017.55.9.657

Abstract
Abstract: In this work, Zn(BH4)2 was added to improve the hydrogen-storage properties of MgH2. A 99 wt% MgH2+1 wt% Zn(BH4)2 sample was prepared by milling in a planetary ball mill in a hydrogen atmosphere. The proportion of the added Zn(BH4)2 was small (1 wt%) in order to increase hydriding and..... More

      
Review of Conductive Copper Paste for c-Si Solar Cells
Sang Hee Lee, Doo Won Lee, Soo Hong Lee
Korean J. Met. Mater. 2017;55(9):637-644.   Published online 2017 Aug 30
DOI: https://doi.org/10.3365/KJMM.2017.55.9.637

Abstract
In the photovoltaic industries, the main technique of metallization is screen printing with silver pastes, due to its simple and quick process. However, the high price of silver paste is one of the barriers to the producing of low cost solar cells. Consequently, a primary target in photovoltaic research is..... More

      
Wetting Behavior of Liquids on Micro-Patterned Polymer Surfaces Fabricated by Thermal Imprinting
Kwang-Jin Bae, Wenhui Yao, Yiliang He, Young-Rae Cho
Korean J. Met. Mater. 2017;55(9):624-631.   Published online 2017 Aug 30
DOI: https://doi.org/10.3365/KJMM.2017.55.9.624

Abstract
The wetting behavior of liquids on solid surfaces is important in the study of surfaces and interfaces. In this study, the wetting behavior of deionized (DI) water and hexadecane on fluorinated and micro-patterned polymer surfaces was investigated. The sample surfaces were processed by spray coating and thermal imprinting, respectively. The..... More

      
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