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Volume 60(6); Jun 2022
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Research Papers
409 Continuous Synthesis of Monodisperse Spherical Silica Powder Using Tubular Reaction System
Young-Sang Cho, Chiyeop Hwang, Seong-Jun Kim, U-Hyeon Park
Korean J. Met. Mater. 2022;60(6):409-422.   Published online 2022 May 24
DOI: https://doi.org/10.3365/KJMM.2022.60.6.409

In the present study, monodisperse silica nanospheres were synthesized using a tubular reaction system in a continuous way. Screw-type blades were inserted inside a T-mixer for static mixing of the reactant streams which consisted of TEOS and NH4OH/H2O diluted with ethanol, for the continuous synthesis of the silica suspension. The..... More

423 Hot Workability and Dynamic Recrystallization Behaviors of Medium-Carbon Cr-Mo Alloys for High Strength Cold Heading Quality Wire Rod
고강도 냉간압조용 중탄소 Cr-Mo 합금강의 고온변형특성 및 동적재결정 거동 평가
YongDeok Jo, HuiJu Lee, SungSil Nam, HyeonWoo Kang, ByoungLok Jang
조용덕, 이희주, 남성실, 강현우, 장병록
Korean J. Met. Mater. 2022;60(6):423-431.   Published online 2022 May 24
DOI: https://doi.org/10.3365/KJMM.2022.60.6.423

The hot deformation behavior of medium-carbon Cr-Mo alloy, which has been developed for high strength cold-heading quality wire rod, was investigated to evaluate its hot workability. A flow curve was derived using the hot torsion test, under conditions with temperatures of 1173-1273 K and strain rates of 0.1-1.0 s-1. At..... More

432 Process Optimization for Dual Laser Beam Joining for Dissimilar Plastics
Suwon Kim, PilGong Choi, Soo Jin Choi, Sang Bae Han, Jiyeon Choi, Jeng O Kim, Hyonkee Sohn, Sanghoon Ahn, Jiwhan Noh, Heeshin Kang, Kwangyun Jung, Dohyun Kim, Hyun-Deok Kim, Changkyoo Park
Korean J. Met. Mater. 2022;60(6):432-439.   Published online 2022 May 24
DOI: https://doi.org/10.3365/KJMM.2022.60.6.432

A dual laser beam joining process is introduced for joining dissimilar plastics. A customized laser head was built, and two different diode lasers with central wavelengths of 980 and 1940 nm were simultaneously applied to obtain PMMA/PC-1 and PC-2/ABS joints. Various experimental conditions were employed for the dual laser beam..... More

440 Preparation and Thermoelectric Properties of Si-Doped Tetrahedrites Cu12Sb4-ySiyS13
Min-Cheol Kwon, Il-Ho Kim
Korean J. Met. Mater. 2022;60(6):440-447.   Published online 2022 May 24
DOI: https://doi.org/10.3365/KJMM.2022.60.6.440

Si-doped Cu12Sb4-ySiyS13 (y = 0.1-0.4) compounds were prepared using solid-state synthesis. Each specimen consisted of a single tetrahedrite phase with a densely sintered body whose relative density exceeded 98.9%. The lattice constant decreased from 1.0357 nm to 1.0336 nm as the Si content increased. When the Si doping content (y)..... More

448 Effect of Co3O4/Additive Interface and Crystallite Size on Co3O4 Li-ion Battery Capacity and Cycle Stability
코발트 산화물 리튬 이온 배터리 용량 및 사이클 안정성에 대한 코발트 산화물/첨가제 계면 및 결정립 크기의 영향
Byoung-Nam Park
Korean J. Met. Mater. 2022;60(6):448-454.   Published online 2022 May 24
DOI: https://doi.org/10.3365/KJMM.2022.60.6.448

Due to its high theoretical capacity in the conversion reaction, Co3O4, a transition metal oxide, has been attracting attention as an anode material for lithium-ion batteries. Comparing conventional slurry method with the electrophoretic deposition (EPD) method without additives (conductive agents and binders), we investigated the effect of the Co3O4/additive interface..... More

455 Skinnerite Cu3SbS3: Solid-State Synthesis and Thermoelectric Properties
Go-Eun Lee, Il-Ho Kim
Korean J. Met. Mater. 2022;60(6):455-462.   Published online 2022 May 24
DOI: https://doi.org/10.3365/KJMM.2022.60.6.455

Skinnerite Cu3SbS3, which consists of non-toxic and low-cost elements, is a potential thermoelectric material, however, studies on its thermoelectric properties are limited. In this study, the optimal conditions of mechanical alloying (MA) and hot pressing (HP) for the synthesis of the Cu3SbS3 phase were investigated, and its thermoelectric properties were..... More

463 Synthesis of N-type Bi2Te2.7Se0.3 Compounds through Oxide-Reduction Process and Related Thermoelectric Transport Properties
산화물 환원공정에 의한 n형 Bi2Te2.7Se0.3 화합물의 합성과 열전특성
Young Soo Lim, Bae Gun Park, Gil-Geun Lee
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

We present a study on the synthesis of Bi2Te2.7Se0.3 powders through an oxide reduction process and also on the effect of the oxide reduction process on the thermoelectric transport properties of the resulting Bi2Te2.7Se0.3 compounds. Starting materials of Bi2O3, TeO2 and SeO2 were mechanical milled for homogeneous mixing, and then..... More

471 Effect of Sn addition on the Microstructure and Friction–wear Properties of a Nodular Graphite Cast Iron
Won-Sang Shin, Seungwoo Baek, Yoon-Jun Kim
Korean J. Met. Mater. 2022;60(6):471-477.   Published online 2022 May 24
DOI: https://doi.org/10.3365/KJMM.2022.60.6.471

Nodular graphite cast iron is used in the railway and automobile industries because of its excellent workability, abrasion resistance, mechanical strength, and hardenability. To use nodular graphite cast iron in harsh environments, it is essential to examine their friction–wear properties in conjunction with the surface hardness of the materials. Therefore,..... More

478 Effect of Silica Nanoparticle Dispersion on Flexural Strength of Sand Mold with Sodium Silicate Binder
실리카 나노입자의 분산도가 주형의 항절강도에 미치는 영향
Panseong Kim, Min A Bae, Jae Ho Baek, Jung Ho Jae, Man Sig Lee
김판성, 배민아, 백재호, 제정호, 이만식
Korean J. Met. Mater. 2022;60(6):478-487.   Published online 2022 May 24
DOI: https://doi.org/10.3365/KJMM.2022.60.6.478

Sodium silicate solutions are used as an eco-friendly binder in the casting process. However, the strength of sand molds using the sodium silicate solutions is reduced because of their low humidity resistance. In this study, silica nanoparticles were added to a sodium silicate solution with a constant SiO2/Na2O ratio to..... More

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