Abstract
The oxidation resistance of ZrSi2–4 at.% Al prepared by reactive sintering was evaluated in air between 600 and 1100°C. The microstructure of the intermetallic consists of equiaxed ZrSi2 grains of about 10 μm with isolated nonreacted silicon and aluminum particles at grain boundaries. The oxidation rate of the alloy shows an anomalous dependence with the temperature. Mass-gain curves can be divided in an initial transient state and a subsequent steady state. Although the mass gain in both stages is very low, it is negligible during the steady state. Oxidation during the transient stage is determined by inward oxygen diffusion in the intermetallic substrate. The subsequent decrease in the oxidation rate during the steady stage is caused by the formation of a protective alumina layer. Grain boundaries contribute to the fast inward oxygen transport into the alloy, leading to internal oxidation of nonreacted silicon and aluminum particles.
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