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Table of Contents | February, 2022  Vol. 60   No.2 Previous Issue | Next Issue | Archive
In this issue:

Research Papers
95 Effect of Nickel Silicide Content on the Friction Properties of Wet Sintered Friction Material
습식 소결 마찰재의 마찰특성에 대한 니켈 실리사이드 함량의 영향
Tae-Hyung Park, Sang-Wook Kim, Jong-Kyun Kim, Soong-Keun Hyun
박태형, 김상욱, 김종균, 현승균
Korean J. Met. Mater. 2022;60(2):95-101.   Published online 2022 Jan 12
DOI: https://doi.org/10.3365/KJMM.2022.60.2.95

The effect of nickel silicide on the friction properties of Cu-based wet sintered friction materials was investigated. The microstructure and mechanical properties of nickel silicide added Cu-based wet sintered friction materials were examined. Nickel silicide was prepared by mechanically alloying Ni and Si powder. Three types of Cu-based wet sintered..... More

102 Effect of Precipitates and Cold Working on the Reheat Cracking of STS 347 Austenitic Stainless Steel
STS 347 오스테나이트계 스테인리스강의 재열균열에 미치는 석출물과 냉간 가공의 영향
Il Yoo, Seok-Woo Ko, Jaeyun Kim, Byoungchul Hwang
유일, 고석우, 김재윤, 황병철
Korean J. Met. Mater. 2022;60(2):102-113.   Published online 2022 Jan 12
DOI: https://doi.org/10.3365/KJMM.2022.60.2.102

The aim of this study was to investigate the effect of precipitates and cold working on the reheat cracking of STS 347 austenitic stainless steel. Three different heat treatments to form NbC and M23C6 precipitates were applied to the STS 347 austenitic stainless steel and 10% pre-strain was additionally introduced..... More

114 Effect of Repeated Repair Welding on the Mechanical Properties and Pitting Corrosion Resistance of Super Duplex Stainless Steel
슈퍼듀플렉스 스테인리스강의 반복 수정용접이 기계적 물성과 공식저항성에 미치는 영향
Yusung Kim, Seongkil Nam, Myeonghwan Choi, Namhyun Kang
김유성, 남성길, 최명환, 강남현
Korean J. Met. Mater. 2022;60(2):114-123.   Published online 2022 Jan 12
DOI: https://doi.org/10.3365/KJMM.2022.60.2.114

The study investigated the effect of repeated repair welding on the mechanical properties and pitting corrosion resistance of 25% Cr super duplex stainless steels (UNS S32750). The test coupons were prepared by gas tungsten arc welding (GTAW) with ER2594 filler metal and repaired 3-times at the same weld locations, where..... More

124 Electrowinning of Neodymium Metal Using FLiNdBa Molten Salt
FLiNdBa 용융염을 이용한 네오디뮴 금속의 전해채취
Sung-Wook Cho, Jeong-Hyun Yu
조성욱, 유정현
Korean J. Met. Mater. 2022;60(2):124-131.   Published online 2022 Jan 12
DOI: https://doi.org/10.3365/KJMM.2022.60.2.124

Neodymium is the most used of rare earth elements. Its demand is rapidly increasing as the raw material for Nd-Fe-B permanent magnets. In the present study, the preparation of neodymium metal by molten salt electrowinning was investigated, using the support salt of LiF:NdF3:BaF2 = 7.5:67.4:25.1 (in wt%, FLiNdBa). It focused..... More

132 Separation of Pd(II) and Zn(II) from Sulfuric Acid Solution by Commercial Extractants
황산용액에서 상용화 추출제에 의한 팔라듐(II)과 아연(II)의 분리
Si Jeong Song, Viet Nhan Hoa Nguyen, Man Seung Lee
송시정, Viet Nhan Hoa Nguyen, 이만승
Korean J. Met. Mater. 2022;60(2):132-140.   Published online 2022 Jan 12
DOI: https://doi.org/10.3365/KJMM.2022.60.2.132

Spent electroplating solutions contain a small amount of Pd(II). This Pd(II) can be concentrated by cementation with zinc metal powder. In order to recover pure palladium, a hydrometallurgical process consisting of leaching followed by solvent extraction was developed in this work. First, suitable extractants for the selective extraction of Pd(II)..... More

141 Sintering Mechanism and Enhanced Piezoelectric and Crystal Structural Properties of (1-x)Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 Lead Free Ceramics
Yoo-Young Oh, Gwangseop Lee, Masao Kamiko, Jung-Hyuk Koh
Korean J. Met. Mater. 2022;60(2):141-148.   Published online 2022 Jan 12
DOI: https://doi.org/10.3365/KJMM.2022.60.2.141

A lead-free piezoelectric ceramic, (1-x)Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 (hereafter (1-x)BZT-xBCT), was investigated for functional device applications. Lead-free piezoelectric materials with high piezoelectric charge coefficients and voltage coefficients are indispensable for functional industrial applications. Piezoelectric ceramic specimens tend to shrink in size during the sintering process without melting. This study focused on this phenomenon..... More

149 Dependency of Conductive Atomic Force Microscopy and Lateral Force Microscopy Signals on Scan Parameters for Zinc Oxide Nanorods
Yijun Yang, Kwanlae Kim
Korean J. Met. Mater. 2022;60(2):149-159.   Published online 2022 Jan 12
DOI: https://doi.org/10.3365/KJMM.2022.60.2.149

Conductive atomic force microscopy (C-AFM) is one of the most commonly used characterization techniques for piezoelectric one-dimensional nanomaterials. However, a comprehensive understanding of the effects of certain scan parameters on the C-AFM signals remains elusive. In the present work, the dependency of C-AFM signals on the normal force, scan speed,..... More

160 Effect of UV Irradiation on Optical Properties of Water-Based Synthetic Zinc Selenide Quantum Dots
자외선 조사가 수계 용매에서 합성된 셀렌화 아연 양자점의 광학특성에 미치는 영향
Geum Ji Back, Yu Jin Kang, I Ju Kang, Jeong Hyeon Lim, Hyun Seon Hong
백금지, 강유진, 강이주, 임정현, 홍현선
Korean J. Met. Mater. 2022;60(2):160-167.   Published online 2022 Jan 12
DOI: https://doi.org/10.3365/KJMM.2022.60.2.160

ZnSe quantum-dots were synthesized in an aqueous system and UV irradiation was introduced as a post-treatment process. The synthesis temperature was varied from 25 oC to 90 oC, and the surface of the nano powder was stabilized using different ligands such as glutathione (GSH), 3-mercaptopropionic acid (MPA) and thioglycolic acid..... More

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