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Table of Contents | April, 2021  Vol. 59   No.4 Previous Issue | Next Issue | Archive
In this issue:

Research Papers
217 Study on a Superhydrophobic Stainless Steel (SUS 304) Surface to Enhance Corrosion Resistance
내식성 향상을 위한 기능성 초발수 스테인리스 스틸 (SUS 304) 표면 연구
Youngju Park, Chanyoung Jeong
박영주, 정찬영
Korean J. Met. Mater. 2021;59(4):217-222.   Published online 2021 Mar 24
DOI: https://doi.org/10.3365/KJMM.2021.59.4.217

Abstract
Stainless steel is a metal with excellent workability, economy, and corrosion resistance, so it is used in various industrial applications including the marine, machinery, electronic parts, piping, power generation, and nuclear power fields. However, in contaminated environments such as marine and gas pipelines, stainless steel has problems, including surface aging..... More

                        
223 A Study on Lithium Hydroxide Recovery Using Bipolar Membrane Electrodialysis
바이폴라 전기투석을 이용한 수산화리튬 회수에 관한 기초 연구
Yeonchul Cho, Kihun Kim, Jaewoo Ahn, Jaeheon Lee
조연철, 김기훈, 안재우, 이재헌
Korean J. Met. Mater. 2021;59(4):223-232.   Published online 2021 Mar 24
DOI: https://doi.org/10.3365/KJMM.2021.59.4.223

Abstract
Bipolar electrodialysis was used in a process of desalting a lithium sulfate solution, converting it to lithium hydroxide and sulfuric acid, and concentrating and recovering them. The effects of the experimental variables such as applied voltage, the concentration of electrode solution, the concentration of raw material solution, volume ratio, and..... More

                        
233 Microstructural Analysis of Solder Bump Fabricated by Sn Electroplating on a PCB Substrate
Sn 도금을 통한 PCB 기판상의 솔더 범프 제작 및 미세조직 분석
Sang-Hyeok Kim, Seong-Jin Kim, Han-Kyun Shin, Hyun Park, Cheol-Ho Heo, Seongjae Moon, Hyo-Jong Lee
김상혁, 김성진, 신한균, 박현, 허철호, 문성재, 이효종
Korean J. Met. Mater. 2021;59(4):233-238.   Published online 2021 Mar 24
DOI: https://doi.org/10.3365/KJMM.2021.59.4.233

Abstract
To manufacture finer solder bumps, the SR and DFR patterns were filled using a Sn electroplating process instead of the microball process currently used in BGA technology, and the solder bump shape was fabricated through a reflow process. The microstructure of the solder bump was investigated by EBSD and TEM..... More

                        
239 Effects of Charge Compensation on the Thermoelectric Properties of (La1-zCez)0.8Fe4-xCoxSb12 Skutterudites
Kyung-Wook Jang, Ye-Eun Cha, Deok-Yeong Choi, Sunuk Kim, Won-Seon Seo, Kyu Hyoung Lee, Il-Ho Kim
Korean J. Met. Mater. 2021;59(4):239-246.   Published online 2021 Mar 24
DOI: https://doi.org/10.3365/KJMM.2021.59.4.239

Abstract
La/Ce-partially double-filled and Co-charge-compensated (La1−zCez)0.8Fe4−xCoxSb12 skutterudites were synthesized, and their thermoelectric properties were studied by varying the filling ratio and charge compensation. X-ray diffraction analysis revealed that the matrix phase was skutterudite and a secondary phase was determined to the marcasite FeSb2. However, the formation of marcasite could be inhibited..... More

                        
247 Structure and Ion Conductivity Study of Argyrodite (Li5.5PS4.5Cl1.5) according to Cooling Method
냉각 방법에 따른 Argyrodite (Li5.5PS4.5Cl1.5)의 구조 및 이온전도성 연구
Sangwon Park, Jin-Woong Lee
박상원, 이진웅
Korean J. Met. Mater. 2021;59(4):247-255.   Published online 2021 Mar 24
DOI: https://doi.org/10.3365/KJMM.2021.59.4.247

Abstract
All solid-state batteries (ASSBs) are now anticipated to be an ultimate solution to the persistent safety issues of conventional lithium-ion batteries (LIBs). Contemporary society’s expanding power demands and growing energy consumption require energy storage with greater reliability, safety and capacity, which cannot be easily achieved with current state-of-the-art liquid-electrolyte-based LIBs...... More

                        
256 A Reasonable DFT Calculation Method for Hybrid Organic-Inorganic Halide Perovskites
MAPbI3 구조를 기반으로 한 하이브리드 유무기 할라이드 페로브스카이트 구조의 합리적인 DFT 계산 방법 연구
Jin-Woong Lee, Woon Bae Park
이진웅, 박운배
Korean J. Met. Mater. 2021;59(4):256-261.   Published online 2021 Mar 24
DOI: https://doi.org/10.3365/KJMM.2021.59.4.256

Abstract
Hybrid Organic-Inorganic Perovskites (HOIP) have received a great deal of attention as a key material for applications like solar cells and light emitting devices because of their many advantages, in spite of their stability and toxicity issues. Attempting to discover and characterize novel HOIPs using just an experimental approach would..... More

                        
262 Effect of ZnS/C Mass Ratio on the Morphologies and Luminescence Properties of ZnO Nano/Microstructures Synthesized via Thermal Evaporation of ZnS and C Powder Mixtures
ZnS와 C의 혼합 분말을 열증발시켜 생성된 ZnO 나노/마이크로구조의 형상과 발광 특성에 미치는 ZnS/C 질량비의 영향
Geun-Hyoung Lee
이근형
Korean J. Met. Mater. 2021;59(4):262-267.   Published online 2021 Mar 24
DOI: https://doi.org/10.3365/KJMM.2021.59.4.262

Abstract
ZnO nano/microstructures were grown via a simple thermal evaporation process in air at atmospheric pressure. Mixtures of ZnS and carbon powders were used as the sources. The effects of growth temperature and mass ratio of carbon powder to ZnS on the morphologies and luminescence properties of the ZnO nano/microstructures were..... More

                        
268 Fabrication and Surface Deformation of Boron Nitride Nanotubes by RF Plasma and Ion Beam
Seong Min Hong, Jae Geun Gil
Korean J. Met. Mater. 2021;59(4):268-272.   Published online 2021 Mar 24
DOI: https://doi.org/10.3365/KJMM.2021.59.4.268

Abstract
Boron Nitride Nanotubes (BNNT) are one of the candidate materials for storing hydrogen by physical adsorption. It has been reported that this hydrogen storage capacity increases as the crystallinity of the nanostructures decreases. Here, BNNT was synthesized using an RF plasma torch system, and the surface of the BNNT was..... More

                        
273 Characterization of the Strength of a Natural Sand and Artificial Sand Core Manufactured with Inorganic Binder
물유리계 바인더로 제조한 천연주물사와 인공주물사 중자의 강도 특성
Min A Bae, Pan Seong Kim, Kyeong Ho Kim, Man Sig Lee, Jae Ho Baek
배민아, 김판성, 김경호, 이만식, 백재호
Korean J. Met. Mater. 2021;59(4):273-280.   Published online 2021 Mar 24
DOI: https://doi.org/10.3365/KJMM.2021.59.4.273

Abstract
Natural sand and organic binders are commonly used in casting processes, but these ingredients produce environmental problems with dust and harmful TVOC(Total Volatile Organic Carbon) gases. Research on the introduction of artificial sand and inorganic binders to solve these environmental problems is being actively conducted mainly in the casting industry...... More

                        
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