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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

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

Facile Synthesis of Single-Phase Alpha-Tungsten Nanopowders from Ammonium Paratungstate by RF Induction Thermal Plasma and Thermochemical Reduction
Dongyoon Shin, Hyun-Woo Shim, Basudev Swain, Kyung-Soo Park, Chan-Gi Lee
Korean J. Met. Mater. 2020;58(11):798-807.   Published online 2020 Oct 15
DOI: https://doi.org/10.3365/KJMM.2020.58.11.798

Facile, economic methods of preparing tungsten (W) nanopowder are critically needed to meet industrial demand. Herein, we report a method of preparing single-phase alpha-W (α-W) nanopowders using ammonium paratungstate (APT) as a starting material and the optimum synthesis conditions. The process involves two stages: i) the radio-frequency (RF) induction thermal..... More

                           Cited By 1
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

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 1
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

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

Adsorption and Recovery using Vaporization of Liquid Fluorocarbon Precursor
액상플루오르카본전구체(Liquid Fluorocarbon Precursor)의 기화를 이용한 흡착 및 회수
Junyoung Park, Byoungmoon Oh, Kyongnam Kim
박준영, 오병문, 김경남
Korean J. Met. Mater. 2020;58(6):397-402.   Published online 2020 May 14
DOI: https://doi.org/10.3365/KJMM.2020.58.6.397

PFC gas is primarily used during the etching process in the manufacture of ULSIs and in cleaning after CVD processes. PFC is classified as a greenhouse gas that stays in the atmosphere for a long time and has a high GWP. High capacity and high integration have been achieved in..... 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

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

Corrosion Characteristics of Plasma Electrolytic Oxidation Treated AZ31 Magnesium Alloy with an Increase of the Coating Thickness
AZ31 마그네슘 합금의 플라즈마전해 산화막 두께 성장에 따른 내식특성
Boeun Choi, Wonsub Chung, Yonghwan Kim
최보은, 정원섭, 김용환
Korean J. Met. Mater. 2020;58(2):87-96.   Published online 2020 Jan 8
DOI: https://doi.org/10.3365/KJMM.2020.58.2.87

The growth of the PEO coating with processing time on an AZ31B magnesium alloy in a dilute alkaline electrolyte containing silicate and the corrosion characteristics according to its thickness were investigated. The oxide film grew a porous outer layer mainly consisting of silicate with the spark discharge phenomenon from the..... More

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

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

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

                           Cited By 1
Bridge Burst Characteristics of Aluminum and Copper Thin-Film Bridges in Electrical Initiation Devices
Kyoungjin Kim, Kyu-Hyoung Kim, Seung-gyo Jang
Korean J. Met. Mater. 2018;56(3):235-243.   Published online 2018 Mar 6
DOI: https://doi.org/10.3365/KJMM.2018.56.3.235

The optimal design of electrical initiation devices for explosive charges and other high energy materials critically depends on the bridge burst or the electrical explosion of the thin-film metallic bridges. It is therefore quite important to select the right material with suitable explosion properties for the metallic bridge film. However,..... More

Factors Influencing Plasma Electrolytic Oxidation(PEO) Coatings on Magnesium Alloys: A Review
마그네슘 합금의 플라스마전해산화 코팅에 영향을 미치는 제반 요소들에 대한 고찰
Gunchoo Shim
Korean J. Met. Mater. 2017;55(5):296-307.   Published online 2017 May 9
DOI: https://doi.org/10.3365/KJMM.2017.55.5.296
Magnesium alloys, which possess excellent specific strength and castability, are highly susceptible to corrosion. Although anodizing is widely used to resolve this problem, it requires toxic electrolytes and produces relatively thin and weak surface coatings. Recently, plasma electrolytic oxidation (PEO) has emerged as an alternative to anodizing. Although it is... More
         Cited By 6
Powder Metallurgy
Microstructure Changes of ZrO<sub>2</sub>/W/Mo Coating Layers on Graphite after Heat Treatment at 2100
용사 코팅한 ZrO2/W/Mo-Graphite 코팅층의 2100 ℃ 열처리 후 미세조직 변화에 관한 연구
Gyu Baek Ahn, Kyeong Hwan Choe, Sang Sub Kim, Gue Serb Cho
안규백, 최경환, 김상섭, 조규섭
Korean J. Met. Mater. 2016;54(8):559-565.   Published online 2016 Aug 5
DOI: https://doi.org/10.3365/KJMM.2016.54.8.559

A tungsten coating was deposited onto a graphite substrate using the atmospheric plasma spraying (APS) technique. In order to increase the adhesion strength between the metallic tungsten(W) and graphite, a molybdenum (Mo) interlayer was pre-deposited onto the graphite surface by utilizing the APS technique. Also, after deposition of a APS-W..... More

         Cited By 4
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