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.
|Number of pages||6|
|Journal||International Journal of Applied Ceramic Technology|
|Publication status||Published - 2012 Jan 1|
ASJC Scopus subject areas
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry