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Korean J. Met. Mater.
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Korean Journal of Metals and Materials
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텅스텐산암모늄 단계 생략 초경합금 슬러지 재활용 공정에 의해 제조된 텅스텐의 소결 및 경도 특성
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권한중, 신정민
Korean J. Met. Mater.
2022;60(1):53-61. Published online 2021 Dec 10
DOI:
https://doi.org/10.3365/KJMM.2022.60.1.53
Abstract
In this paper, we suggest a novel recycling process for hard metal sludge that does not use ammonium paratungstate. Ammonia, which in the conventional recycling process is essential for removing sodium and crystallized tungstate, was not used in the novel process. Instead of ammonia, acid was used to remove the.....
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Web of Science 1
Crossref 2
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텅스텐 나노박막의 상변태를 이용한 반투명 면상발열체 형성 연구
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최지윤, 최두호
Korean J. Met. Mater.
2021;59(9):664-669. Published online 2021 Aug 4
DOI:
https://doi.org/10.3365/KJMM.2021.59.9.664
Abstract
In this study, we prepared highly thermostable semi-transparent heaters composed of W layers with thicknesses of 1-20 nm, on which a 30 nm-thick ZnO layer was deposited to serve as an anti-oxidation barrier. The optical transmittance and sheet resistance of the heaters could be greatly modulated by varying the W.....
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Web of Science 1
Crossref 1
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급속소결에 의한 WC-Graphene-Al 복합재료 제조 및 기계적 성질
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손인진
Korean J. Met. Mater.
2021;59(6):384-391. Published online 2021 May 26
DOI:
https://doi.org/10.3365/KJMM.2021.59.6.384
Abstract
Tungsten carbides are very attractive because of their superior properties, e.g., high thermal and electrical conductivities, high melting point, high hardness, and relatively high chemical stability. Tungsten carbides with a binder metal, for example Ni or Co, are mainly used to fabricate nozzles, molds and cutting tools in the composite.....
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Web of Science 1
Crossref 1
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Korean J. Met. Mater.
2021;59(6):357-364. Published online 2021 May 26
DOI:
https://doi.org/10.3365/KJMM.2021.59.6.357
Abstract
W-containing Ti-6Al-4V alloys (W=0, 1, and 5 wt%) were fabricated by the powder injection molding process, and the corresponding effects of tungsten content on the mechanical properties and microstructure of the alloys were investigated. The alloy powders were sintered at 1200 °C and then hot-isostatically-pressed at 900 °C. The fabricated.....
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Web of Science 3
Crossref 4
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초음파 분무 열분해법으로 제조한 텅스텐 미세분말의 미세조직과 소결 거동
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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
o
C, showed tungsten oxide.....
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Web of Science 2
Crossref 2
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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
Abstract
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.....
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Web of Science 4
Crossref 4
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Metal Injection Molding 공정으로 제조된 W-7Ni-3Fe 텅스텐 중합금의 미세조직 및 기계적 특성에 미치는 열처리의 영향
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윤성준, 주연아, 윤태식, 이기안
Korean J. Met. Mater.
2018;56(10):727-733. Published online 2018 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.10.727
Abstract
This study investigated the microstructure and room temperature mechanical properties of W-7Ni-3Fe (wt%) tungsten heavy alloy (as-fabricated) which was manufactured by metal injection molding (MIM). To identify the effect of heat treatment on the W-7Ni-3Fe alloy, its properties were compared after heattreatment (1,100 oC for 1 hour) in vacuum atmosphere......
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Crossref 1
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Korean J. Met. Mater.
2017;55(6):405-411. Published online 2017 Jun 1
DOI:
https://doi.org/10.3365/KJMM.2017.55.6.405
Abstract
The solvent extraction of tungsten(VI) from hydrochloric acid solutions using 5,8-diethyl- 7-hydroxydodecan-6-one oxime (LIX 63) was analyzed in solutions having an initial pH range from 2 to 5, by varying the concentration of metal and extractant. In our experimental range, the cationic exchange reaction as well as the solvation reaction.....
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Crossref 5
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WC/Co 초경 스크랩 산화물의 환원/침탄 반응
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권철민, 이길근, 하국현
Korean J. Met. Mater.
2016;54(10):743-751. Published online 2016 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.10.743
Abstract
This study conducted an analysis of the carbothermal reduction of oxidized WC/Co hardmetal scrap with solid carbon under an argon and hydrogen gas atmosphere. The WC/Co hardmetal scrap oxide consisted of WO
3
and CoWO
4
. WO
3
was reduced before CoWO
4
by the solid carbon regardless of gas atmosphere. The simple oxide.....
More
Crossref 3
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