• 제목/요약/키워드: Mo powder

검색결과 456건 처리시간 0.026초

기계적 합금화 및 스파크 플라즈마 소결에 의해 제조된 Al-Fe-X계 합금의 열적 안정성: II. Al-Fe-Cr and Al-Fe-Mo (Thermal Stability of Al-Fe-X Alloy System Prepared by Mechanical Alloying and Spark Plasma Sintering: II. Al-Fe-Cr and Al-Fe-Mo)

  • 이현권;이상우;조경식
    • 한국분말재료학회지
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    • 제12권1호
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    • pp.43-50
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    • 2005

  • Mechanical alloying using high-energy ball mill and subsequent spark plasma sintering (SPS) process was applied to Al-Fe-Cr and Al-Fe-Mo powder mixture to investigate effects of Cr and Mo addition on thermal stability of Al-Fe, and thereby to enhance its thermal stability up to $500^{\circC}$. Various analytical techniques including micro-Vickers hardness test, SEM, TEM, X-ray diffractometry and corrosion test were carried out. It was found that addition of Cr and Mo to Al-Fe system played a role of grain growth inhibitor of matrix Al and some precipitates such as $Al_3Fe$ during SPS and subsequent heat treatment. The inhibition of grain growth resulted in increased Vickers hardness and thermal stability up to $500^{\circC}$ comparing to those of Al-Fe alloy system.

  • https://doi.org/10.4150/KPMI.2005.12.1.043 인용 PDF KSCI

Ti-6Al-4V 및 Ti-8Al-1Mo-1V 합금 스크랩을 이용한 저산소 분말 제조와 탈산방법 비교 (Preparation of Low Oxygen Content Powder from Ti-6Al-4V and Ti-8Al-1Mo-1V Alloy Scraps with Deoxidation in Solid State Process)

  • 오정민;서창열;권한중;임재원;노기민
    • 자원리싸이클링
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    • 제24권1호
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    • pp.21-27
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    • 2015

  • Ti-6Al-4V 및 Ti-8Al-1Mo-1V (AMS 4972) 합금 스크랩을 대상으로 수소화-탈수소화(HDH) 기술로 분말을 제조하고 칼슘 접촉식과 비접촉식 방법으로 탈산을 실시하여 탈산효과를 비교하였다. 타이타늄을 대상으로 한 이전 연구결과에서는 비접촉식 탈산법이 탈산 효과가 더 크다고 보고되었으나 산소함유량을 분석한 결과 Ti-6Al-4V 및 Ti-8Al-1Mo-1V 합금 분말 모두 비접촉식으로 탈산한 분말의 산소함유량이 더 높은 것으로 밝혀졌다. 따라서, 본 연구에서는 XRD와 가스분석기를 이용하여 합금 내에 가장 많이 함유되어 있는 알루미늄이 비접촉식 탈산 공정 중 탈산에 미치는 영향을 조사하였다.

  • https://doi.org/10.7844/kirr.2015.24.1.21 인용 PDF KSCI

Establishing CCT Diagrams for Sinter Hardening Grade Cr-Mo Prealloyed Steels

  • Stetina, G.;Kalss, G.;Gierl, C.;Danninger, H.;Orth, P.
    • 한국분말야금학회:학술대회논문집
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    • 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part2
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    • pp.836-837
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    • 2006

  • A CCT diagram for Cr-Mo prealloyed sintered steels suitable for sinter hardening was established by combining dilatometry data, microstructural studies and microhardness measurements of the material. CCT diagrams deepen the understanding of material properties after sinter hardening and support the design of materials on an industrial scale by providing information about required cooling rates for successful sinter hardening of these materials.

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Effect of Cu During Non-isothermal Hydrogen Reduction of $MoO_3$

  • Kim, Gil-Su;Kim, Dae-Gun;Oh, Sung-Tag;Suk, Myung-Jin;Kim, Young-Do
    • 한국분말야금학회:학술대회논문집
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    • 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part2
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    • pp.1329-1330
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    • 2006

  • The effect of Cu on the hydrogen reduction of $MoO_3$ powders was investigated by measuring the humidity change during a non-isothermal process of hydrogen reduction. The presence of Cu induced a shift in the reduction temperature and strongly affected the reduction processes of $MoO_3\rightarrowMo_4O_{11}\rightarrowMoO_2$, which comprised the contained chemical vapor transport of $MoO_x(OH)_2$. This study suggests that the surface of the Cu grains acts as a nucleation site for the reduction of $MoO_x(OH)_2$ to $MoO_2$ particles from $MoO_3$ or $Mo_4O_{11}$. Such an activated reduction process results in the deposition of Mo and $MoO_2$ particles on the surface of the Cu.

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