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Synthesis of N-type Bi<sub>2</sub>Te<sub>2.7</sub>Se<sub>0.3</sub> Compounds through Oxide-Reduction Process and Related Thermoelectric Transport Properties
산화물 환원공정에 의한 n형 Bi2Te2.7Se0.3 화합물의 합성과 열전특성
Young Soo Lim, Bae Gun Park, Gil-Geun Lee
임영수, 박배건, 이길근
Korean J. Met. Mater. 2022;60(6):463-470.   Published online 2022 May 24
DOI: https://doi.org/10.3365/KJMM.2022.60.6.463

Abstract
We present a study on the synthesis of Bi2Te2.7Se0.3 powders through an oxide reduction process and also on the effect of the oxide reduction process on the thermoelectric transport properties of the resulting Bi2Te2.7Se0.3 compounds. Starting materials of Bi2O3, TeO2 and SeO2 were mechanical milled for homogeneous mixing, and then..... More

                        
Improvement of Mechanical Properties of Hard Metals Using Solid Solution Strengthened Metallic Binder (Co<sub>1-x</sub>W<sub>x</sub>)
고용 강화 금속 바인더(Co1-xWx) 적용을 통한 초경합금의 기계적 특성 향상
Hanjung Kwon
권한중
Korean J. Met. Mater. 2022;60(1):14-25.   Published online 2021 Dec 10
DOI: https://doi.org/10.3365/KJMM.2022.60.1.14

Abstract
The metallic binder in WC-Co hard metals was effectively strengthened using the solid solution phases of Co and W. These metallic phases of Co and W (Co1-xWx, x<1), which consist of two kinds of structures (FCC and HCP), were successfully formed by hydrogen reduction of milled oxides mixtures (Co3O4 and..... More

                        
Microstructure and Sintering Behavior of Fine Tungsten Powders Synthesized by Ultrasonic Spray Pyrolysis
초음파 분무 열분해법으로 제조한 텅스텐 미세분말의 미세조직과 소결 거동
Hyeonhui Jo, Jeong Hyun Kim, Young-In Lee, Young-Keun Jeong, Sung-Tag Oh
조현희, 김정현, 이영인, 정영근, 오승탁
Korean J. Met. Mater. 2021;59(5):289-294.   Published online 2021 Apr 6
DOI: https://doi.org/10.3365/KJMM.2021.59.5.289

Abstract
The powder microstructure and sintering behavior of W prepared by ultrasonic spray pyrolysis and spark plasma sintering were investigated. Fine-grained W powders were synthesized by ultrasonic spray pyrolysis using an ammonium metatungstate hydrate solution and hydrogen reduction. The XRD analysis of the powder, pyrolyzed below 600 oC, showed tungsten oxide..... More

                        
Microstructure and Mechanical Properties of Cu-Ni-Zr-Ti Bulk Metallic Glass Composites by Spark Plasma Sintering
방전플라즈마 소결법에 의해 제조된 Cu-Ni-Zr-Ti 비정질 기지 복합재료의 미세조직 및 기계적 특성
Da Woon Shin, Hong Min, Jin Kyu Lee
신다운, 민 홍, 이진규
Korean J. Met. Mater. 2021;59(5):281-288.   Published online 2021 Apr 6
DOI: https://doi.org/10.3365/KJMM.2021.59.5.281

Abstract
In the present study, Cu54Ni6Zr22Ti18 bulk metallic glass composites were developed by spark plasma sintering(SPS) using gas atomized Cu54Ni6Zr22Ti18 metallic glass powders and Ta powders. Metallic glass composites with Ta phase were fabricated by SPS. The successful consolidation of Cu54Ni6Zr22Ti18 metallic glass matrix composites with the Ta phase was achieved..... More

                        
Microstructure and Mechanical Properties of NiCrY<sub>2</sub>O<sub>3</sub> Alloy Sintered Powder Composed of Oxide-Embedded Metallic Particles
Changjae Kim, Jungho Gwak, Jaewon Lim, Minsuk Oh, Jeshin Park
Korean J. Met. Mater. 2020;58(12):843-851.   Published online 2020 Dec 4
DOI: https://doi.org/10.3365/KJMM.2020.58.12.843

Abstract
In this study, oxide (Y2O3)-embedded Ni particles were fabricated via a new process. The process involves the mechanical hydrogenation of Ni–Y alloy into Ni–YH2 and the selective oxidation of Ni–YH2 to Ni–Y2O3. The alloy powders were prepared for sintering by the mechanical alloying of a mixed powder. The powder was..... More

                        
Property Evaluation of Tungsten-Carbide Hard Materials as a Function of Fe Contents
Fe 함량변화에 따른 텅스텐카바이드 초경소재의 특성평가
Ju-Hun Kim, Jeong-Han Lee, Junho Jang, Ik-Hyun Oh, Sung-Kil Hong, Hyun Kuk Park
김주훈, 이정한, 장준호, 오익현, 홍성길, 박현국
Korean J. Met. Mater. 2020;58(8):533-539.   Published online 2020 Jul 27
DOI: https://doi.org/10.3365/KJMM.2020.58.8.533

Abstract
In this study, consolidated WC-Fe compacts as a function of Fe contents were fabricated by a spark plasma sintering method, following the mixed by the ball-milled powder. Fe among the metallic binders was added to WC enhance not only the driving force of sintering process but also suppressing the grain..... More

                           Cited By 5
Effect of Zn-Doping on the Phase Transition Behavior and Thermoelectric Transport Properties of Cu<sub>2</sub>Se
Zn 도핑이 Cu2Se의 상전이 거동과 열전수송특성에 미치는 영향
Seung Hyun Jin, Young Soo Lim
진승현, 임영수
Korean J. Met. Mater. 2020;58(7):466-471.   Published online 2020 Jul 5
DOI: https://doi.org/10.3365/KJMM.2020.58.7.466

Abstract
We report on the phase transition behavior and thermoelectric transport properties of Zn-doped Cu2Se. Cu2Se is comprised of nontoxic, low-cost and abundant elements, and has been attracting attention because of its very high thermoelectric performance, ZT, at high temperatures. Many studies have reported enhanced ZT in impurity doped Cu2Se, however,..... More

                        
Thermoelectric Transport Properties of N-type Bi<sub>2</sub>Te<sub>2.7</sub>Se<sub>0.3</sub> Compound Prepared by Oxide-Reduction Process
산화물 환원공정에 의해 제작된 n-형 Bi2Te2.7Se0.3 화합물의 열전특성연구
Young Soo Lim, Bae Gun Park, Gil-Geun Lee
임영수, 박배건, 이길근
Korean J. Met. Mater. 2020;58(5):334-339.   Published online 2020 Apr 20
DOI: https://doi.org/10.3365/KJMM.2020.58.5.334

Abstract
We report the thermoelectric transport properties of n-type Bi2Te2.7Se0.3 compounds prepared by oxide-reduction process. The oxide-reduction process is a recently developed method that can synthesize Bi2Te3-based compounds using only oxide starting materials, which is advantageous in terms of the diversity of the starting materials and cost efficiency. In this study,..... More

                           Cited By 2
Up- and Downconversion Luminescence in Ho<sup>3+</sup>,Yb<sup>3+</sup>-Co-Doped Y<sub>2</sub>O<sub>3</sub> Transparent Ceramics Prepared by Spark Plasma Sintering
Cheol Woo Park, Jun Hyeong In, Jae Hwa Park, Kwang Bo Shim, Jeong Ho Ryu
Korean J. Met. Mater. 2019;57(9):609-616.   Published online 2019 Aug 21
DOI: https://doi.org/10.3365/KJMM.2019.57.9.609

Abstract
We employed spark plasma sintering (SPS) in the presence of sintering aids to fabricate high-quality Ho3+,Yb3+-co-doped Y2O3 transparent ceramics suitable for use as a laser gain medium, and analyzed their microstructure and optical properties. Ho3+,Yb3+-co-doped Y2O3 transparent ceramics with different contents of Yb3+ were fabricated by SPS and exhibited high..... More

                           Cited By 3
Thermoelectric Properties of <i>p</i>-type Polycrystalline Si Prepared by Melt-Spinning Process
용융방사법으로 제작된 p-type 다결정 Si의 열전특성 연구
Ju Hyeong Sun, Young Soo Lim
선주형, 임영수
Korean J. Met. Mater. 2018;56(9):686-692.   Published online 2018 Sep 5
DOI: https://doi.org/10.3365/KJMM.2018.56.9.686

Abstract
Thermoelectric energy conversion has attracted much attention as an efficient and environment-friendly energy technology. Thermoelectric energy conversion performance is directly influenced by the figure of merit (ZT) of the thermoelectric material, however, most known thermoelectric materials with high ZT contain toxic and/or scarce elements. Herein, we report the thermoelectric properties..... More

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