• Title/Summary/Keyword: 자전고온합성

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Effect of Heating Rate on Self-Propagating, High-Temperature Synthesis of $TiAl_3$ Intermetallic from Multi-Layered Elemental Foils (다층원소박판에서 $TiAl_3$의 고온자전합성에 미치는 승온속도의 영향)

  • Kim, Yeon-Uk;Kim, Byeong-Gwan;Nam, Tae-Un;Heo, Bo-Yeong;Kim, Yeong-Jik
    • Korean Journal of Materials Research
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    • v.8 no.11
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    • pp.987-992
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    • 1998
  • Titanium aluminide intermetallic compound was formed from high purity elemental Ti and A1 foils by selfpropagating, high-temperature synthesis(SHS1 in hot press. Formation of $TiAl_3$ intermetallics at the interface between Ti and Al foil was observed to be controlled by temperature, pressure and heating rate. Especially, the heating rate is the most important role to form intermetallic compound by SHS reaction. According to DTA experiment, the SHS reactions appeared at two different temperatures below and above the melting point of Al. It was also observed that both SHS reaction temperatures increased with increasing the heating rate. After the SHS reaction of alternatively layered 10 Ti and 9 A1 foils at the heating rate of $20^{\circ}C$/min, the $700\mu\textrm{m}$ thick titanium aluminide sheet was formed by heat treatment at $810^{\circ}C$ for 4hours.

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Preparation of TaC Powder from the Waste of Ta powder Fabrication Process for Capacitor (Capacitor용 Ta분말 제조공정 Waste Ta를 이용한 TaC분말 제조)

  • Park Je-Shin;Suh Chang-Youl;Yaon Jae-Sik;Bae In-Sung;Park Hyeoung-Ho
    • Resources Recycling
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    • v.12 no.4
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    • pp.51-57
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    • 2003
  • Using the wastes of Ta powder fabrication process for capacitor, TaC powder was synthesized by SHS method. In previous to synthesis, the waste Ta was needed of milling and deoxidization treatments for active reaction and prevention of oxidation. In SHS reaction, it was found that the TaC single phase was obtained in composition of 5~6wt.%C. The reaction temperature was affected by the compaction pressure of the specimens, exhibiting the maximum values at 1600psi, respectively.

An Update Technology Trend in Iron Oxide (산화철의 기술개발동향)

  • Sohn Jin-Gun
    • Resources Recycling
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    • v.12 no.6
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    • pp.3-7
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    • 2003
  • For the manufacture of iron oxide, the hydro-process and the pyre-process are conventionally used. Both processes use a huge amount of chemicals in reaction which affect the environment harmfully. This paper introduced the new environment friendly processes; the bio-chemical process and the self propagating high temperature synthesis process.