Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Densification Behavior of Rhenium Alloy using Master Sintering Curve

  • Park, Dong Yong (Department of Mechanical Engineering, Pohang University of Science and Engineering (POSTECH)) ;
  • Oh, Yong Jun (Division of New Materials Engineering, Hanbat National University) ;
  • Kwon, Young Sam (CetaTech, Inc.) ;
  • Lim, Seong Taek (Agency for Defense Development) ;
  • Park, Seong Jin (Department of Mechanical Engineering, Pohang University of Science and Engineering (POSTECH))
  • Received : 2014.02.12
  • Accepted : 2014.02.17
  • Published : 2014.02.28
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Abstract

This study investigated the densification behavior of rhenium alloys including W-25 wt.%Re and Re-2W-1Ta (pure Re) during sintering. The dilatometry experiments were carried out to obtain the in-situ shrinkage in $H_2$ atmosphere. The measured data was analyzed through shrinkage, strain rate and relative density, and then symmetrically treated to construct the linearized form of master sintering curve (MSC) and MSC as a well-known and straightforward approach to describe the densification behavior during sintering. The densification behaviors for each material were analyzed in many respects including apparent activation energy, densification parameter, and densification ratio. MSC with a minimal set of preliminary experiments can make the densification behavior to be characterized and predicted as well as provide guideline to sinter cycle design. Considering the results of linearized form and MSC, it was confirmed that the W-25 wt.%Re compared to Pure Re is more easily densified at the relatively low temperature.

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