Influences of Al 2 O 3 grain size on high-temperature oxidation of nano-Ni/Al 2 O 3 composites

Hai Vu Pham, Daisuke Maruoka, Makoto Nanko

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Two 5 vol% Ni/Al 2 O 3 composites with the difference in Al 2 O 3 grain size were fabricated by pulsed electric current sintering technique to investigate the influence of Al 2 O 3 grain size on oxidation behavior of the composites. Average Al 2 O 3 grain sizes of two fabricated composites were 1.1 μm and 0.5 μm after sintering. Oxidation tests were conducted at temperatures ranging from 1100 to 1350 °C for 1-48 h in air. A thin NiAl 2 O 4 layer was observed in exposed surface of samples after oxidation. An oxidized zone that consisted of Al 2 O 3 matrix and NiAl 2 O 4 grains was defined. Growth of the oxidized zone obeyed the parabolic law. Influences of Al 2 O 3 grain size on high-temperature oxidation of the composites were discussed.

Original languageEnglish
Pages (from-to)120-123
Number of pages4
JournalJournal of Asian Ceramic Societies
Volume4
Issue number1
DOIs
Publication statusPublished - 2016 Mar 1

Keywords

  • Al O
  • Grain size
  • High-temperature oxidation
  • Nanocomposite

ASJC Scopus subject areas

  • Ceramics and Composites

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