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Thermoelectric Properties of MnSi1.74-1.75:Gem Prepared by Solid-State Reaction and Hot Pressing
In-Jae Lee, Sol-Bin Park, Soon-Chul Ur, Kyung-Wook Jang, Il-Ho Kim
Korean J. Met. Mater. 2019;57(4):264-269.   Published online 2019 Apr 5
DOI: https://doi.org/10.3365/KJMM.2019.57.4.264

Abstract
Higher manganese silicides (HMSs) MnSi1.74-1.75:Gem (m = 0.01–0.04) were prepared by solid-state reaction and hot pressing. The major phases of the HMSs were Mn27Si47 or Mn4Si7, and a small quantity of Si remained, but the intermetallic compound MnSi was not formed. The lattice constant increased with the substitution of Ge..... More

                        
Comparative Leaching Study on Conichalcite and Chalcopyrite Under Different Leaching Systems
Jiajia Wu, Junmo Ahn, Jaeheon Lee
Korean J. Met. Mater. 2019;57(4):245-250.   Published online 2019 Apr 5
DOI: https://doi.org/10.3365/KJMM.2019.57.4.245

Abstract
Copper leaching from low-grade copper ore samples obtained from two active mines in the US, named conichalcite (sample A) and chalcopyrite (sample B), were studied under different leaching conditions using sulfuric acid and methane sulfonic acid (MSA). The conichalcite, sample A, is calcium-copper arsenite hydroxide [CaCu(AsO4)(OH)] with small amount of..... More

                        
Corrosion of Hot-dip Aluminized 9Cr-1Mo Steel in N2/0.1%H2S Gas
Muhammad Ali Abro, Junhee Hahn, Dong Bok Lee
Korean J. Met. Mater. 2019;57(4):236-244.   Published online 2019 Apr 5
DOI: https://doi.org/10.3365/KJMM.2019.57.4.236

Abstract
ASTM P91 steel (viz. 9Cr-1Mo steel) was hot-dip aluminized to form a ~70 μm thick coating, and was then corroded in N2/0.1%H2S gas for 50 h at 800 and 900 ºC, to study the effect of aluminizing on the corrosion resistance of P91 steel in highly corrosive H2S environments. Before..... More

                        
Anisotropy in Green Body Bending Strength due to Additive Direction in the Binder-Jetting Additive Manufacturing Process
Ji-Won Oh, Sahn Nahm, Byoungmoon Kim, Hanshin Choi
Korean J. Met. Mater. 2019;57(4):227-235.   Published online 2019 Apr 5
DOI: https://doi.org/10.3365/KJMM.2019.57.4.227

Abstract
The additive manufacturing (AM) process is a production technology process that has recently attracted attention. Among AM processes, the binder jetting (BJ) method is advantageous because it allows both wide material selection and design freedom. However, the output arrangement, which determines the direction in which the binder is injected during..... More

                        
Effects of Zn(BH4)2, Ni, and/or Ti Doping on the Hydrogen-Storage Features of MgH2
Myoung Youp Song, Young Jun Kwak
Korean J. Met. Mater. 2019;57(3):176-183.   Published online 2019 Feb 8
DOI: https://doi.org/10.3365/KJMM.2019.57.3.176

Abstract
In the present work, MgH2 was doped with Zn(BH4)2, Ni, and/or Ti to improve its hydrogen absorption and release features. Samples were prepared by grinding in a planetary ball mill in a hydrogen atmosphere. To increase the hydrogen absorption and release rates without significantly sacrificing hydrogenstorage capacity the additive percentages..... More

                        
Extraction Behavior of Hydrogen Ion by an Ionic Liquid Mixture of Aliquat 336 and Cyanex 272 in Chloride Solution
Minh Nhan Le, Seong Ho Son, Man Seung Lee
Korean J. Met. Mater. 2019;57(3):162-169.   Published online 2019 Feb 8
DOI: https://doi.org/10.3365/KJMM.2019.57.3.162

Abstract
During the extraction of metal ions from a weak acidic chloride solution by ionic liquids consisting of an organophosphorus extractant and Aliquat 336, the equilibrium pH is sometimes observed to be higher than the initial pH. To compare the hydrogen ion extraction behavior of tertiary and quaternary amines, Alamine 336,..... More

                        
Improvement of Alumina Dissolution from the Mechanically Activated Dross Using Ultrasound-Assisted Leaching
Thi Thuy Nhi Nguyen, Man Seung Lee
Korean J. Met. Mater. 2019;57(3):154-161.   Published online 2019 Feb 14
DOI: https://doi.org/10.3365/KJMM.2019.57.3.154

Abstract
Aluminum dross results from the re-melting of used aluminum cans, and is a valuable resource containing alumina. In general, aluminum dross contains oxides of Al, Ca, Fe, Mg, Si and Ti and some salts. As a continuation of the previous work to recover pure alumina from the dross, the effect..... More

                        
Pressure Transmission in the Compaction Process of Nickel Powder Using the Finite Element Methods
Jong Won Baek, Seong Jin Park
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,..... More

                        
Numerical Investigation of the Self-Propagation of Intermetallic Reaction Waves in Nanoscale Aluminum/Nickel Reactive Multilayer Foils
Kyoungjin Kim
Korean J. Met. Mater. 2019;57(2):97-107.   Published online 2019 Jan 8
DOI: https://doi.org/10.3365/KJMM.2019.57.2.97

Abstract
Among several candidates for nanoenergetic materials and systems, nanoscale reactive multilayer foils (NRMF) or bimetallic nano-laminates are highly promising candidates. They provide the highly desirable pyrotechnical properties of high energy density and reaction sensitivity as well as flexible tunability. They could be useful in various fields of explosive and propellant..... More

                        
Synthesis and Characterization of ZnO/TiO2 Photocatalyst Decorated with PbS QDs for the Degradation of Aniline Blue Solution
Jong-Ho Lee, Hong-Joo Ahn, Jeong-Il Youn, Young-Jig Kim, Su-Jeong Suh, Han-Jun Oh
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

                           Cited By 1
Hydrogen Storage Properties of Mg Alloy Prepared by Incorporating Polyvinylidene Fluoride via Reactive Milling
Myoung Youp Song, Young Jun Kwak
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

                           Cited By 2
Hydrogenation Properties of MgH2–CaO Composites Synthesized by Hydrogen-Induced Mechanical Alloying
Min Gyeom Kim, Jeong-Heum Han, Young-Hwan Lee, Jong-Tae Son, Tae Whan Hong
Korean J. Met. Mater. 2018;56(11):829-834.   Published online 2018 Nov 5
DOI: https://doi.org/10.3365/KJMM.2018.56.11.829

Abstract
Although magnesium-based alloys are attractive materials for hydrogen storage applications, their activation properties, hydrogenation/dehydrogenation kinetics, thermodynamic equilibrium parameters, and degradation characteristics must be improved for practical applications. Further, magnesium poses several risks, including explosion hazard, environmental pollution, insufficient formability, and industrial damage. To overcome these problems, CaO-added Mg alloys, also..... More

                        
Thermoelectric Properties of P-type (Ce1-zYbz)0.8Fe4-xCoxSb12 Skutterudites
Deok-Yeong Choi, Ye-Eun Cha, Il-Ho Kim
Korean J. Met. Mater. 2018;56(11):822-828.   Published online 2018 Nov 5
DOI: https://doi.org/10.3365/KJMM.2018.56.11.822

Abstract
P-type Ce/Yb-filled skutterudites were synthesized, and their charge transport and thermoelectric properties were investigated with partial double filling and charge compensation. In the case of (Ce1-zYbz)0.8Fe4Sb12 without Co substitution, the marcasite (FeSb2) phase formed alongside the skutterudite phase, but the generation of the marcasite phase was inhibited by increasing Co..... More

                        
Comparative Study of Estimation Methods of the Endpoint Temperature in Basic Oxygen Furnace Steelmaking Process with Selection of Input Parameters
Tae Chang Park, Beom Seok Kim, Tae Young Kim, Il Bong Jin, Yeong Koo Yeo
Korean J. Met. Mater. 2018;56(11):813-821.   Published online 2018 Nov 5
DOI: https://doi.org/10.3365/KJMM.2018.56.11.813

Abstract
The basic oxygen furnace (BOF) steelmaking process in the steel industry is highly complicated, and subject to variations in raw material composition. During the BOF steelmaking process, it is essential to maintain the carbon content and the endpoint temperature at their set points in the liquid steel. This paper presents..... More

                        
Charge Transport and Thermoelectric Properties of (La1−zPrz)0.8Fe4−xCoxSb12 Skutterudites
Ye-Eun Cha, Il-Ho Kim
Korean J. Met. Mater. 2018;56(10):772-778.   Published online 2018 Oct 5
DOI: https://doi.org/10.3365/KJMM.2018.56.10.772

Abstract
Partially La/Pr-double-filled and Co-substituted (La1−zPrz)0.8Fe4−xCoxSb12 skutterudites were synthesized by encapsulated melting and vacuum hot pressing. (La,Pr)Sb2 phases were not formed because the partial filling did not exceed the filling fraction limit, and the amount of secondary phase FeSb2 also decreased as the Co content increased. Electrical conductivity decreased with increasing..... More

                        
Diluents Role in Extraction and Possible Separation of Light Rare Earth Elements from Chloride Solutions by using Cyanex® 272 used as an Extractant
Rajesh Kumar Jyothi, Hae-Rim Kim, Joon Soo Kim, Kyeong-Woo Chung, Jin-Young Lee
Korean J. Met. Mater. 2018;56(10):763-771.   Published online 2018 Oct 5
DOI: https://doi.org/10.3365/KJMM.2018.56.10.763

Abstract
The present paper deals with liquid-liquid extraction studies and the possible separation of light rare earths (LREs) from chloride solutions. Aromatic diluents such as benzene, toluene and xylene were tested for LREs extraction and possible separation from chloride solutions. Bis(2,4,4-triethylpentyl)phosphinic acid (trade name Cyanex® 272) was used as an extractant..... More

                        
Effect of MgO Addition on the Monoclinic to Tetragonal Transition of ZrO2 Fabricated by High Energy Ball Milling
Ashutosh Sharma, Byungmin Ahn
Korean J. Met. Mater. 2018;56(10):718-726.   Published online 2018 Oct 5
DOI: https://doi.org/10.3365/KJMM.2018.56.10.718

Abstract
In this work, we studied the formation of partially stabilized zirconia by a high energy ball milling (HEBM) approach. Zirconia powder was mixed with 8 mol% MgO and the powder mixture was milled for 10 hours. The structural and morphological evolutions of the powder particles were studied using X-ray diffraction..... More

                        
Thermoelectric Properties of Ge-doped Higher Manganese Silicides MnSi1.72-1.73:Gem
Sol-Bin Park, In-Jae Lee, Il-Ho Kim
Korean J. Met. Mater. 2018;56(9):693-698.   Published online 2018 Sep 5
DOI: https://doi.org/10.3365/KJMM.2018.56.9.693

Abstract
Ge-doped higher manganese silicides (HMSs) MnSi1.72–1.73:Gem (m = 0.01-0.04) were prepared and their thermoelectric properties were studied. HMS powders were synthesized by solid-state reaction of raw material powders (Mn, Si, and Ge) at 1273 K for 6 h in vacuum, and hot-pressed at 1173 K for 2 h under 70..... More

                           Cited By 1
Effects of Annealing on Structure and Magnetic Properties of Fe-Si-Al Flakes
Pyungwoo Jang
Korean J. Met. Mater. 2018;56(9):680-685.   Published online 2018 Sep 5
DOI: https://doi.org/10.3365/KJMM.2018.56.9.680

Abstract
This study elucidates the effects of annealing on the properties of Fe-Si-Al flakes. The changes of the DO3 phase, the lattice parameter and the grain size of the flakes were analyzed by X-ray peak broadening and shift. Static magnetic properties, namely, coericivity and saturation magnetization, were analyzed by a vibration..... More

                        
Influence of Nanosized AlN Powders on the Microstructure, Brazeability, and Tensile Properties of Al-based Filler for Low Temperature Al/Cu Dissimilar Brazing
Do Hyun Jung, Jae Pil Jung
Korean J. Met. Mater. 2018;56(9):664-673.   Published online 2018 Sep 5
DOI: https://doi.org/10.3365/KJMM.2018.56.9.664

Abstract
This study examined the influence of nanosized aluminum nitride (AlN) powders (0, 0.01, 0.05, 0.10, 0.30, and 0.50 wt%), on an Al4047-based filler metal. Nanosized AlN powders were dispersed uniformly into the filler metal by a mechanical mixing and melting route using a stainless steel propeller. The influences of nanosized..... More

                        
Effect of BN Addition on the Mechanical Properties of TiN-BN Composites
Woo-Jin Cho, In-Jin Shon
Korean J. Met. Mater. 2018;56(9):658-663.   Published online 2018 Sep 5
DOI: https://doi.org/10.3365/KJMM.2018.56.9.658

Abstract
Titanium nitride (TiN) has been used extensively in coating materials and cutting tools because of its attractive properties, which include low density, high melting point, high hardness and thermodynamic stability. However, like many ceramic materials, its low fracture toughness limits wide industrial application. The methods generally utilized to improve its..... More

                        
Characteristics of Electroless Sn Plating Electrolyte using a Choline Chloride-Based Ionic Liquid
Chieon Park, Bongyoung Yoo, Joonkyun Lee
Korean J. Met. Mater. 2018;56(9):645-651.   Published online 2018 Sep 5
DOI: https://doi.org/10.3365/KJMM.2018.56.9.645

Abstract
In the present study, a choline chloride(ChCl)-based ionic liquid(IL) was used as an electrolyte to confirm the characteristics of electroless tin plating. The effect of the type of additive and reducing agent, as well as the addition of complexing agent and water, on the properties of the ChCl-based IL, including..... More

                           Cited By 1
Raising the Dehydrogenation Rate of a Mg-CMC (Carboxymethylcellulose, Sodium Salt) Composite by Alloying Ni via Hydride-Forming Milling
Myoung Youp Song, Eunho Choi, Young Jun Kwak
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, [C6H7O2(OH)x(C2H2O3Na)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

                           Cited By 1
Hydrogen Uptake and Release Characteristics of Mg-xTaF5-xVCl3 (x=1.25, 2.5, and 5)
Myoung Youp Song, Young Jun Kwak
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
TaF5 and VCl3 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

                           Cited By 4
Charge Transport and Thermoelectric Properties of N-type Bi2-xSbxTe3-ySey:Im Prepared by Encapsulated Melting and Hot Pressing
Woo-Jin Jung, Hyeok-Jin Kim, Il-Ho Kim
Korean J. Met. Mater. 2018;56(7):544-550.   Published online 2018 Jul 5
DOI: https://doi.org/10.3365/KJMM.2018.56.7.544

Abstract
Iodine-doped n-type Bi2-xSbxTe3-ySey:Im (x = 0.1–0.2, y = 0.15–0.6, and m = 0.0025–0.005) quaternary solid solutions were prepared by encapsulated melting (EM) and hot pressing (HP). The lattice constants of the resulting materials decreased with increasing Sb and Se contents, whereas the amount of I dopant was too small to..... More

                        
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 2
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

                        
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