High-temperature oxidation of Y 2O 3-doped Al 2O 3 matrix composites dispersed with nano-Ni particles

Makoto Nanko, Daisuke Maruoka, Yoku Sato

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The oxidation kinetics of Y 2O 3-doped Al 2O 3-based composites dispersed with 5 vol% nano-Ni particles was investigated at temperatures ranging from 1200° to 1350°C in air. The oxidized zone consisted of Al 2O 3 matrix and NiAl 2O 4, which was an oxidation product and a thin surface NiAl 2O 4 layer. The growth of the oxidized zone followed a parabolic manner, which means that mass transport in the oxidized zone was the rate-controlling process. Doping of Y 2O 3 into Al 2O 3 matrix decreases growth rate of the oxidized zone. The value of the apparent activation energy was 681 kJ/mol, which was larger than that of nondoped Ni/Al 2O 3 composites.

Original languageEnglish
Pages (from-to)172-177
Number of pages6
JournalInternational Journal of Applied Ceramic Technology
Volume9
Issue number1
DOIs
Publication statusPublished - 2012 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Marketing
  • Materials Chemistry

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