• Title/Summary/Keyword: Powder Spherodization

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NEW FRONTIERS IN THERMAL PLASMAS FROM SPACE TO NANOMATERIALS

  • Boulos, Maher I.
    • Nuclear Engineering and Technology
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    • v.44 no.1
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    • pp.1-8
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    • 2012
  • Thermal plasma technology has been at the center of major developments over the past century. It has found numerous applications ranging from aerospace materials testing to nanopowder synthesis and processing. In the present review highlights of principal breakthroughs in this field are presented with emphasis on an analysis of the basic phenomena involved, and the potential of the technology for industrial scale applications.

Fabrication of Carbon Nanofiber/Cu Composite Powder by Electroless Plating and Microstructural Evolution during Thermal Exposure (무전해 도금에 의한 탄소나노섬유/Cu 복합 분말 제조 및 열적 안정성)

  • Kim In-soo;Lee Sang-Kwan
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2004.10a
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    • pp.39-42
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    • 2004
  • Carbon nanofiber/Cu composite powder has been fabricated by electroless plating process. Microstructural evolution of the composite powder after heat treatment under vacuum, hydrogen and air environment was investigated. A dispersed carbon nanofiber coated by copper was produced at the as-plated condition. Carbon nanofiber is coated uniformly and densely with the plate shaped copper particles. The copper plates on the carbon nanofiber aggregate during the thermal exposure at elevated temperature in vacuum and hydrogen in order to reduce surface energy. The thermal exposure of the composite powder in air at $400^{\circ}C$ for 3 hours leads to the spherodization of the composite powder owing to oxidation of copper.

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Spherodization of Granuled Cr2O3 Fine Ceramic Powder by Plasma Spray (플라즈마 분사 처리에 의한 Cr2O3 조립분말의 구상화에 대한 연구)

  • Lee, Dong Won;Lee, Hak Sung;Yu, Ji-Hun;Wang, Jei-Pil
    • Resources Recycling
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    • v.25 no.6
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    • pp.92-97
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    • 2016
  • Spray dried $Cr_2O_3$ powder having an agglomerated structure of particles was twice treated into a plasma flame to increase its apparent density. The powder subjected to the first densification treatment did not show the entirely melted state keeping inner particle hollows, and it was fully melted after the second processing only. The powder size as a result of the second treatment decreased, and the apparent density as well as flowability were increased due to melting and surface smoothing effects. But a part of particles after the second densified treatment showed the hollow structure, especially those which were above $30{\mu}m$ in size. This densification behavior of the powder has been qualitatively discussed in terms of the thermal conductivity and inner gas pressure within aggregates exposed to the plasma flame.