Preparation of Ni-Al alloys at reduced temperature for fuel cell applications

Hyung Chul Ham, Anatoly P. Maganyuk, Jonghee Han, Sung Pil Yoon, SukWoo Nam, Tae Hoon Lim, Seong Ahn Hong

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Ni-Al alloys have been fabricated from the physical mixture of nickel and aluminum powders at temperatures below the melting point of aluminum using AlCl 3 vapor as an activator. Pure Ni 3Al intermetallic compound has been synthesized from the Ni-Al powder mixtures containing 15 wt% aluminum at 600 °C. From the powder mixture containing 5 wt% aluminum, a compound consisting of Ni-Al solid solution and Ni 3Al was produced at 600 °C, but this compound was converted entirely to a Ni-Al solid solution after annealing at 700 °C. The particle size and morphology of the Ni-Al solid solution were not greatly different from original nickel powders. It was observed that oxidation resistance was significantly enhanced by alloying of nickel with aluminum. The Ni-Al alloys synthesized in this study can be used as anode materials for high-temperature fuel cells which need improved resistance toward creep, sintering and redox cycling.

Original languageEnglish
Pages (from-to)733-737
Number of pages5
JournalJournal of Alloys and Compounds
Volume446-447
DOIs
Publication statusPublished - 2007 Oct 31

Keywords

  • Gas-solid reactions
  • High temperature alloys
  • Intermetallics
  • Thermal analysis
  • X-ray diffraction

ASJC Scopus subject areas

  • Metals and Alloys

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