Abstract
Ni-Co-ThO 2 composites prepared by a coprecipitation method have been studied under air oxidation conditions between 800 and 1000 ° C. Thermogravimetry showed slight but continuous oxidation of the material. The effect of 5–20% chromium powder additions to the base powder mixture was studied. The results demonstrated significant decreases in oxidation rate, starting from 10 wt.-% chromium addition while efficient protection was obtained from 15 wt.-% by formation of a Cr 2O 3 scale. Polarized light microscopy studies, as well as scanning electron microscopy, coupled with X-ray emission microanalysis and X-ray diffraction, enabled qualitative analysis of the different zones distinguished inside the oxide scale. This led to the establishment of an oxidation mechanism related to the chromium content.
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