• 제목/요약/키워드: powder fabrication

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핵연료분말 제조에서 반응물질의 변화가 분말의 특성에 미치는 영향 (Powder Characteristics by Change of Reacting Material in Nuclear Fuel Powder Preparation)

  • 정경채;박진호;황성태
    • 한국세라믹학회지
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    • 제33권6호
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    • pp.631-636
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    • 1996
  • The powder characteristics of UO2 via AUC prepared by precipitation from a UN with AC soiution produced from nuclear fuel powder conversion plant and that of the existing facility were compared. Mean particle size of AUC powder was decreased and agglomerates were much occured in case of using the AC solution that that of the gases but other properties such as particle size distribution and shape of particle are thought to be similarly. In compaction of UO2 powder the breaking pressur of agglomerated UO2 powder and the sintered density of final UO2 pellet from AC solution were measured 1.45$\times$108 N/m2 and 10.52 g/cc, These values could be used in nuclear fuel powder fabrication process.

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Making Alumina Microcomponents from Al Powder

  • Kim, J.S.;Jiang, K.;Falticeanu, L.;Daviesd, G.J.;Chang, I.
    • 한국분말야금학회:학술대회논문집
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    • 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part2
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    • pp.864-865
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    • 2006
  • Alumina microcomponents have distinguishing advantages over Si counterpart. However, the shrinkage of alumina, as high as 20%, makes it difficult to produce precision components meeting a high tolerance. A new fabrication process presented to greatly reduce the shrinkage by producing alumina microcomponents from ultrafine Al powder. The process consists of forming Al powder components through sintering and turning the Al powder component into alumina. In this way, the shrinkage occurring in sintering the Al powder component will be compensated by the expansion appearing when the Al powder component turns into alumina. The process has proven successful.

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Development of Titanium Powder Injection Molding: Rheological and Thermal Analyses

  • Wu, Yunxin;Park, Seong-Jin;Heaney, Donald F.;Zou, Xin;Gai, Guosheng;Kwon, Young-Sam;German, Randall M.
    • 한국분말야금학회:학술대회논문집
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    • 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part 1
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    • pp.227-228
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    • 2006
  • Powder injection molding (PIM) is a suitable technology for the fabrication of complex shape titanium and its alloys, and has a great potential in many applications. This paper dealt with the injection molding of hydride dehydrogenization (HDH) titanium powder, spheroidized HDH titanium powder and gas atomized titanium powder. Rheological and thermalgravimetric behaviors were compared between the feedstocks of the three powders, and a tentative application of Ti PIM to eye frame temple and bridge was briefed.

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볼밀링에 의한 알루미늄 프레이크 분말 제조 (Fabrication of Aluminium Flake Powder by Ball Milling Process)

  • 이동원
    • 한국분말재료학회지
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    • 제3권3호
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    • pp.159-166
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    • 1996
  • A series of test were undertaken in order to estabilish the effect of different milling variables on dimension and quality of aluminium flake powder. Milling conditions such as initial powder size, milling container rotation speed, milling time, and ball size were varied to produce aluminium flake powder. Flake powder could then be obtained with size range from 15 $\mu$m to 40 $\mu$m with a maximum specific surface area of 5 $m^{2}$/g by controlling milling conditions. Diameter of milled powders with different milling container rotation speed and ball size were compared with that obtained from theoretical model. The best flake powder was obtained in milling condition of initial powder with average size of 19 $\mu$m, mill container rotation speed of 80 rpm, balls of 9.5 mm diameter, and milling time of 40 hours.

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