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Eco-Friendly Pretreatment of Titanium Turning Scraps and Subsequent Preparation of Ferro-Titanium Ingots
Jikwang Chae, Jung-Min Oh, Suhwan Yoo, Jae-Won Lim
Korean J. Met. Mater. 2019;57(9):569-574.   Published online 2019 Aug 21
DOI: https://doi.org/10.3365/KJMM.2019.57.9.569

Abstract
In this study, an eco-friendly pretreatment process was developed to recycle titanium turning scraps and ferro-titanium ingots with low gaseous impurities were prepared using recycled titanium turning scraps. The amount of gaseous impurities of titanium scraps before removing the machining oils on the surface was as high as 20000 ppm...... 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

Abstract
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

                        
Synthesis and Characterization of ZnO/TiO<sub>2</sub> Photocatalyst Decorated with PbS QDs for the Degradation of Aniline Blue Solution
Jong-Ho Lee, Hong-Joo Ahn, Jeong-Il Youn, Young-Jig Kim, Su-Jeong Suh, Han-Jun Oh
Korean J. Met. Mater. 2018;56(12):900-909.   Published online 2018 Dec 5
DOI: https://doi.org/10.3365/KJMM.2018.56.12.900

Abstract
A ZnO/TiO2 photocatalyst decorated with PbS quantum dots (QDs) was synthesized to achieve high photocatalytic efficiency for the decomposition of dye in aqueous media. A TiO2 porous layer, as a precursor photocatalyst, was fabricated using micro-arc oxidation, and exhibited irregular porous cells with anatase and rutile crystalline structures. Then, a..... More

                           Cited By 2
Efficacy of Acid Cleaning on the Deoxidation of Titanium Powder Using Calcium
Chon-Il Hong, Jae-Won Lim
Korean J. Met. Mater. 2018;56(3):205-209.   Published online 2018 Mar 6
DOI: https://doi.org/10.3365/KJMM.2018.56.3.205

Abstract
The optimum acid cleaning conditions for removing CaO formed by the reaction of Ca with Ti powder were investigated in this study. In this experiment, we used Ti powders composed of irregular polygonal Ti particles with average sizes of 125 mm and 250 μm. Ca granules were charged at 50%..... More

      
Hydrogen-Affected Tensile and Fatigue Properties of Ti-6Al-4V Sheets by Superplastic Forming
Jinil Son, Junhyuk Park, Daeho Jeong, Yongnam Kwon, Masahiro Goto, Sangshik Kim
Korean J. Met. Mater. 2017;55(9):615-623.   Published online 2017 Aug 30
DOI: https://doi.org/10.3365/KJMM.2017.55.9.615

Abstract
Mill-annealed Ti-6Al-4V (Ti64) sheets were formed into rectangular shaped pans with two square recesses by the superplastic forming (SPF) technique under high pressure using commercial grade argon gas. The SPF process induced a significant decrease in the tensile ductility and high cycle fatigue (HCF) resistance of the Ti64 alloy. The..... More

      
High-strength Ti Alloy Prepared via Promoting Interstitial-Carbon Diffusion
침입형 탄소 확산을 이용하여 제조한 고강도 Ti 합금
Bo-Young Kim, Se-Hyun Ko, Jae-Chul Lee
김보영, 고세현, 이재철
Korean J. Met. Mater. 2017;55(5):342-347.   Published online 2017 May 9
DOI: https://doi.org/10.3365/KJMM.2017.55.5.342

Abstract
Feasibility studies are performed to determine the suitability of a novel simple synthesis technique for fabricating a new Ti alloy with improved strength and ductility, while exhibiting lower cell toxicity. Through consolidating pure Ti powders under a C atmosphere at elevated temperatures, a bulk form of the Ti alloy, in..... More

      
Modeling and Simulation
Numerical Simulation of Yttrium Aluminum Garnet(YAG) Single Crystal Growth by Resistance Heating Czochralski(CZ) Method
저항가열 초크랄스키법에 의한 야그 단결정 성장의 전산모사 연구
Myeong Hyeon You, Pil Ryung Cha
유명현, 차필령
Korean J. Met. Mater. 2017;55(1):60-66.   Published online 2017 Jan 5
DOI: https://doi.org/10.3365/KJMM.2017.55.1.60

Abstract
Yttrium Aluminum Garnet (YAG) single crystal has received much attention as the high power solid-state laser’s key component in industrial and medical applications. Various growth methods have been proposed, and currently the induction-heating Czochralski (IHCZ) growth method is mainly used to grow YAG single crystal. Due to the intrinsic properties..... More

      
Optical Devices & Energy Materials
Study of the Morphological, Structural and Photoelectrochemical Properties of TiO<sub>2</sub> Nanorods grown by Hydrothermal Method
수열합성법으로 성장시킨 TiO2 나노로드의 형태학적, 구조적, 광전기화학적 특성 연구
Hayoung Choi, Hyukhyun Ryu, Won-Jae Lee
최하영, 류혁현, 이원재
Korean J. Met. Mater. 2017;55(1):46-52.   Published online 2017 Jan 5
DOI: https://doi.org/10.3365/KJMM.2017.55.1.46

Abstract
We investigated the effects of growth duration on the morphological, structural, and photoelectrochemical properties of TiO2 nanorods grown on a TiO2-buffered fluorine-doped tin oxide (FTO) substrate using the hydrothermal method. From the study, we found that the photoelectrochemical properties were mainly dependent on the nanorod length and (002) XRD peak..... More

         Cited By 2
in situ Fabrication of Fe-TiB<sub>2</sub> Nanocomposite Powder by Planetary Ball Milling and Subsequent Heat-treatment of FeB and TiH<sub>2</sub> Powder Mixture
FeB와 TiH2 혼합분말의 유성볼밀 및 후속열처리에 의한 Fe-TiB2 나노복합분말 in situ 제조
Xuan-Khoa Huynh, Sun-Woo Bae, Ji Soon Kim
Xuan-Khoa Huynh, 배선우, 김지순
Korean J. Met. Mater. 2017;55(1):10-15.   Published online 2017 Jan 5
DOI: https://doi.org/10.3365/KJMM.2017.55.1.10

Abstract
Fe-TiB2 powder was synthesized in-situ by the planetary ball milling and subsequent heat-treatment of an iron boride (FeB) and titanium hydride (TiH2) powder mixture. Mechanical activation of the (FeB+TiH2) powder mixtures was observed after a milling time of 3 hours at 700 rpm of rotation speed, but activation was not..... More

         Cited By 1
Effect of Aging Time and Temperature on Microstructure and Mechanical Properties of Ti-39Nb-6Zr Alloy
Ti-39Nb-6Zr 합금의 시효처리를 통한 미세조직 및 기계적 특성 제어
Hyun Jun Kwon, Ka Ram Lim, Yong Tae Lee, Dong Geun Lee, Jun Hee Lee, Seung Eon Kim
권현준, 임가람, 이용태, 이동근, 이준희, 김승언
Korean J. Met. Mater. 2016;54(12):925-930.   Published online 2016 Dec 5
DOI: https://doi.org/10.3365/KJMM.2016.54.12.925

Abstract
The aim of this study is to optimize the microstructure and mechanical properties of Ti-39Nb-6Zr (TNZ40) for bio-implant applications. TNZ40 was designed to have a low elastic modulus (~40 GPa) and good biocompatibility. However, the alloy shows relatively low strength compared to other titanium alloys for bio-implant. In the present..... More

         Cited By 1

김경욱1,2 · 장진만2 · 김용대2 · 이재철1,* · 이원식2,*

Received 2019 May 21     Accepted 2019 Aug 13     Published online 2019 Sep 6
Abstract
Open-pored metal foams have been partly used for orthopedic or dental applications because of their good bone ingrowth behavior and low elastic modulus. In this paper, we report a method that can produce open-pored Ti foams using a technique that combines the powder injection molding process and feedstocks containing expandable... More
      
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