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Table of Contents | July, 2021  Vol. 59   No.7 Previous Issue | Next Issue | Archive
In this issue:

Research Papers
439 Synthesis and Sintering of Nanostructured ZrB2-SiC Composite
나노구조의 ZrB2-SiC 복합재료 합성과 소결
In-Jin Shon
Korean J. Met. Mater. 2021;59(7):439-444.   Published online 2021 Jun 11
DOI: https://doi.org/10.3365/KJMM.2021.59.7.439

ZrB2 is considered a candidate material for ultra-high temperature ceramics because of its high thermal conductivity, high melting point, and low coefficient of thermal expansion. Despite these attractive properties, applications of ZrB2 are limited by its low fracture toughness below the brittle-ductile transition temperature. To improve its ductile properties, the..... More

                           Cited By 1
445 Evaluation and Control of Liquation Cracking Susceptibility for CM247LC Superalloy Weld Heat-Affected Zone via Visualization-Based Varestraint Test
가시화 기반 Varestraint 시험을 이용한 CM247LC 초내열합금 용접 열영향부의 액화균열 민감도 평가 및 제어
Ye-Seon Jeong, Kyeong-Min Kim, Hyungsoo Lee, Seong-Moon Seo, Eun-Joon Chun
정예선, 김경민, 이형수, 서성문, 천은준
Korean J. Met. Mater. 2021;59(7):445-458.   Published online 2021 Jun 11
DOI: https://doi.org/10.3365/KJMM.2021.59.7.445

The metallurgical aspects of weld cracking in Ni-based superalloys remain relatively unexplored in existing research. The present study performed comprehensive metallurgical and manufactural investigations into the weldability of an Ni-based superalloy, CM247LC, from the viewpoint of the liquation cracking behavior and its susceptibility. Metallurgical solutions to suppress the liquation-cracking susceptibility..... More

                           Cited By 1
459 A Study on the Leaching of Rare Earth Elements from Waste Phosphor Powder
폐형광체 분말로부터 희토류의 회수를 위한 침출 특성 고찰
Gee Hun Lee, Chang Kwon Kim, Dong Hoon Lee, Young Jun Song
이기헌, 김창권, 이동훈, 송영준
Korean J. Met. Mater. 2021;59(7):459-468.   Published online 2021 Jun 16
DOI: https://doi.org/10.3365/KJMM.2021.59.7.459

This study was carried out to obtain data to design a process to recover rare earth elements, specifically Y(Yttrium), La(Lanthanum), Ce(Cerium), Eu(Europium), Tb(Terbium) from waste phosphor powder. For this purpose, we investigated the effect of temperature, concentration, time and acids on leaching of the rare earth elements. The effect of..... More

469 Leaching of a Mixture of Palladium and Zinc Metal Using Hydrochloric and Sulfuric Acid Solutions
염산과 황산용액에서 팔라듐과 아연 금속혼합물의 침출
Si Jeong Song, Viet Nhan Hoa Nguyen, Man Seung Lee
송시정, Viet Nhan Hoa Nguyen, 이만승
Korean J. Met. Mater. 2021;59(7):469-475.   Published online 2021 Jun 16
DOI: https://doi.org/10.3365/KJMM.2021.59.7.469

Spent electroplating solutions contain small amounts of Pd(II). Cementation of Pd(II) with zinc metal powder is practiced to concentrate the Pd. Dissolution of the cemented Pd metal is necessary to recover pure Pd metal or compounds. In this work, the leaching behavior of Pd metal in inorganic acid solutions (hydrochloric..... More

                           Cited By 4
476 A Study on the Stability of TiO2 Nanoparticles as an Electron Transport Layer in Quantum Dot Light-Emitting Diodes
TiO2 나노입자를 전자 수송층으로 사용한 양자점 발광다이오드의 용액 안정성 연구
Moonbon Kim, Jiwan Kim
김문본, 김지완
Korean J. Met. Mater. 2021;59(7):476-480.   Published online 2021 Jun 16
DOI: https://doi.org/10.3365/KJMM.2021.59.7.476

We report highly efficient and robust quantum dot light-emitting diodes (QLEDs) with Li-doped TiO2 nanoparticles (NPs) as an electron transport layer (ETL). As core materials, ZnO-based inorganic NPs can enhance the performance of QLEDs due to their suitable energy level and solution processability. However, their fast electron mobility and instability..... More

                           Cited By 1
481 Effect of Co-Solvent Percentages on the Exfoliation Rate of NiTe2 Thin Film for Transparent Electrodes
혼합용매 비율이 투명전극 용 NiTe2 박막의 박리에 미치는 영향
Jun Ho Lee, Ho Jun Park, Chae Eun Im, Jong Gyeom Kim, Dong Eun Gu, Suk Jun Kim
이준호, 박호준, 임채은, 김종겸, 구동은, 김석준
Korean J. Met. Mater. 2021;59(7):481-490.   Published online 2021 Jun 16
DOI: https://doi.org/10.3365/KJMM.2021.59.7.481

We attempted to maximize the transmittance of 2D NiTe2 thin film using the liquid-phase exfoliation (LPE) process to confirm the applicability of NiTe2 as a transparent electrode. The LPE process, using a co-solvent of organic solvent and water, is a stable and efficient method of increasing transmittance at low cost...... More

491 Tellurium-Incorporated Nickel-Cobalt Layered Double Hydroxide and Its Oxygen Evolution Reaction
Jung-Il Lee, Hui Ra Chae, Jeong Ho Ryu
Korean J. Met. Mater. 2021;59(7):491-498.   Published online 2021 Jun 16
DOI: https://doi.org/10.3365/KJMM.2021.59.7.491

Transition-metal-based layered double hydroxides (LDHs) have attracted substantial attention as highly efficient oxygen evolution reaction (OER) catalysts because they are earth-abundant, low-cost, and environmentally friendly materials with favorable adsorption/desorption energies for intermittent reactants. However, the application of these LDHs as high-performance electrocatalysts is often hindered by their relatively sluggish electronic..... More

499 Enhancement of Dielectric Properties via Crystal Structure and Microstructure Control in the (K0.5Na0.5)NbO3-SrTiO3 System
(K0.5Na0.5)NbO3-SrTiO3계에서 결정구조 및 미세구조 제어를 통한 유전특성 향상
Seong Eun Lee, Jun-Hyeong Kwon, Kyoung-Seok Moon
이성은, 권준형, 문경석
Korean J. Met. Mater. 2021;59(7):499-504.   Published online 2021 Jun 16
DOI: https://doi.org/10.3365/KJMM.2021.59.7.499

Solid solutions and composites of a mixture of (K0.5Na0.5)NbO3 (KNN) and SrTiO3 (ST) were respectively synthesized by different process routes using a conventional solid state reaction. All starting materials were mixed simultaneously and calcined at 800 oC for 4 h to obtain the solid solutions of KNN-ST. Meanwhile, the composites..... More

                           Cited By 1
505 Synthesis of Three-Dimensionally Interconnected Hexagonal Boron Nitride Networked Cu-Ni Composite
Zahid Hussain, Hye-Won Yang, Byung-Sang Choi
Korean J. Met. Mater. 2021;59(7):505-513.   Published online 2021 Jun 16
DOI: https://doi.org/10.3365/KJMM.2021.59.7.505

A three-dimensionally interconnected hexagonal boron nitride (3Di-hBN) networked Cu-Ni (3DihBN-Cu-Ni) composite was successfully synthesized in situ using a simple two-step process which involved the compaction of mixed Cu-Ni powders (70 wt.% Cu and 30 wt.% Ni) into a disc followed by metal-organic chemical vapor deposition (MOCVD) at 1000 oC. During..... More

                           Cited By 1
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