Journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 89, Issue 10, Pages 3240-3245Publisher
WILEY
DOI: 10.1111/j.1551-2916.2006.01229.x
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The oxidation behavior of zirconium diboride containing 30 vol% silicon carbide particulates was investigated under reducing conditions. A gas mixture of CO and similar to 350 ppm CO2 was used to produce an oxygen partial pressure of similar to 10(-10) Pa at 1500 degrees C. The kinetics of the growth of the reaction layer were examined for reaction times of up to 8 h. Microstructures and chemistries of reaction layers were characterized using scanning electron microscopy and X-ray diffraction analysis. The kinetic measurements, the microstructure analysis, and a thermodynamic model indicate that oxidation in CO-CO2 produced a non-protective oxide surface scale.
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