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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

Measurement of Intrinsic Hardness of Deposited Chromium Thin Films by Nanoindentation Method and Influencing Factors
나노인덴테이션 방법으로 크롬 박막의 고유경도를 측정하는 방법과 영향 인자

Young-Joon Kang, Ju-Hwan Baeg, Hyun Park, Young-Rae Cho
강영준, 백주환, 박현, 조영래

Korean J. Met. Mater. 2020;58(3):207-215. Published online 2020 Mar 5
DOI: https://doi.org/10.3365/KJMM.2020.58.3.207

Abstract
Materials with very small dimensions exhibit different physical and mechanical properties compared to their bulk counterparts. This becomes significantly important for the thin films that are widely used as components in micro-electronics and functional materials. In this study, a chromium (Cr) thin film was deposited on a silicon (Si) wafer..... More

Effect of Shear Deformation During Drawing on Inhomogeneous Microstructures and Textures in High Purity Copper Wires After Annealing
고순도 구리 선재의 어닐링 후 불균질 미세조직과 집합조직에 미치는 신선 시 전단 변형의 영향

Hyun Park, Sang-Hyeok Kim, Se-Jong Kim, Hyo-Jong Lee
박현, 김상혁, 김세종, 이효종

Korean J. Met. Mater. 2018;56(12):861-869. Published online 2018 Dec 5
DOI: https://doi.org/10.3365/KJMM.2018.56.12.861

Abstract
To determine the origin of the inhomogeneous microstructure and texture observed in drawn and annealed high purity copper wires, two kinds of drawing process conditions and their influence was investigated. The regular condition, based on a symmetric die, and a condition designed intentionally to produce an inhomogeneous shear deformation using..... More

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Catalytic Activity and Surface Characteristics of WO₃-doped MnO_x-TiO₂ Catalysts for Low-temperature Selective Catalytic Reduction of NO_x with NH₃

Byeongkil Shin, Heesoo Lee, Hyun Park

Korean J. Met. Mater. 2016;54(10):787-792. Published online 2016 Oct 5
DOI: https://doi.org/10.3365/KJMM.2016.54.10.787

Abstract
The effect of added WO₃ on the catalytic activity and surface characteristics of the MnO_x-TiO₂ system was investigated for the low-temperature selective catalytic reduction of NO_x with NH₃. Based on physio-chemical characterizations, the specific surface areas of the WO₃-MnO_x-TiO₂ catalysts increased from 76.12 m²/g to 90.29 m²/g as the WO₃... More

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