Materials Transactions Online

Materials Transactions, Vol.51 No.09 (2010) pp.1570-1573
© 2010 The Japan Institute of Metals

Influence of Si-Doping of Nano-Ni Dispersed Al2O3 Composites on High-Temperature Oxidation

Daisuke Maruoka1 and Makoto Nanko2

1Department of Materials Science, Nagaoka University of Technology, Nagaoka 940-2188, Japan
2Department of Mechanical Engineering, Nagaoka University of Technology, Nagaoka 940-2188, Japan

The oxidation kinetics of 5 vol% nano-Ni dispersed Al2O3 with Si-doping (nano-Ni/Al2O3-Si) was studied in the present paper. The starting powder mixture was prepared by drying aqueous slurry consisting of alumina with nickel nitrate and Si (OCH3)4. The powder mixture was reduced at 600°C for 12 h in a stream of Ar-1%H2 gas mixture. Nano-Ni/Al2O3-Si was densified by pulsed electric current sintering. The oxidation test was conducted at 1200–1350°C for 1–14 d in air. Oxidized zone consisted of Al2O3 matrix and NiAl2O4 as the oxidation product. Growth of the oxidized zone followed a parabolic manner. A thin NiAl2O4 layer was also observed on the sample surface. Si-doping decreases growth rate of oxidized zone effectively at lower temperatures such 1200°C.

(Received 2010/4/26; Accepted 2010/7/5; Published 2010/8/25)

Keywords: nanocomposite, pulsed electric current sintering, high temperature oxidation, alumina

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