Thermal Conductivity of Molten Al, Si and Ni Measured under Microgravity

Kazuhiro Nagata, Hiroyuki Fukuyama, Kouki Taguchi, Hiroyuki Ishii, Miyuki Hayashi

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

The thermal conductivities of molten Si, Ni, Al and their alloys have been measured by means of the non-stationary hot wire method under 1 G and microgravity of 10-5G. A Mo wire was used as the heating wire and coated with alumina by the electrophoretic deposition to prevent an electric current leakage through the melts. Natural convection in the melts was suppressed by measuring the thermal conductivity under the microgravity of 10-5G using the drop shaft facility of the Japan Microgravity Center. Moreover, the free surface of the melts was covered with a ceramics plate to prevent Marangoni flow. The thermal conductivity of molten Si is about 10 Wm-1K-1, and that of molten Al is 47 Wm-1K-1at 1260 K. The thermal conductivity of molten Al-30 mass% Si alloy is about 30 Wm-1K-1, and that of molten Ni is 5 Wm-1K-1at 1773 K. The thermal conductivities of some molten metals are discussed on the deviation from the Wiedemann-Franz law.

Original languageEnglish
Pages (from-to)267-274
Number of pages8
JournalHigh Temperature Materials and Processes
Volume22
Issue number5-6
DOIs
Publication statusPublished - 2003 Apr 17
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Physical and Theoretical Chemistry

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