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Sintering Mechanism and Enhanced Piezoelectric and Crystal Structural Properties of (1-x)Ba(Zr<sub>0.2</sub>Ti<sub>0.8</sub>)O<sub>3</sub>-x(Ba<sub>0.7</sub>Ca<sub>0.3</sub>)TiO<sub>3</sub> 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

Removal of Iron from Ilmenite Through Selective Chlorination Using Coke and Cl<sub>2</sub> Gas
코크스와 염소가스에 의한 일메나이트 광석 중 Fe의 선택염화 제거
So-Yeong Lee, Sung-Hun Park, Ho-Sang Sohn
이소영, 박성훈, 손호상
Korean J. Met. Mater. 2019;57(3):146-153.   Published online 2019 Feb 8
DOI: https://doi.org/10.3365/KJMM.2019.57.3.146

This study on the chlorination of ilmenite ore was carried out using chlorine gas and coke as the chlorinating and reduction agents in a static bed reactor for the selective removal of iron. The effect of the amount of coke, the partial pressure of the chlorine gas and the reaction..... More

                   Web of Science 2  Crossref 4
Growth Rate of Gamma Prime Precipitates in Ni-Base Superalloy
니켈기 초내열합금의 감마프라임상의 성장거동
Junhyeob Oh, Daeyoung Jo, Hongkyu Kim, Jondo Yun
오준협, 조대영, 김홍규, 윤존도
Korean J. Met. Mater. 2018;56(1):8-13.   Published online 2018 Jan 1
DOI: https://doi.org/10.3365/KJMM.2018.56.1.8

The mechanical properties of nickel-base superalloys used in disk and blade materials for gas turbine engines can be maximized by controlling their microstructure, such as the size of precipitates. In this study, we investigated the size of gamma prime precipitates after age hardening heat treatment at 650-980 oC for 1-48..... More

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