  The influence of nitrogen on the oxidation behavior of hot-pressed zirconium
carbide was investigated using a flow-tube furnace at temperatures ranging from
1000 to 1600 {\deg}C. Mass gain, oxide formation characteristics, and oxide
transitions were evaluated at various experimental conditions. Differences in
oxidation behavior across the range of temperatures investigated show both
kinetic and microstructural dependence with implications pointing to this
materials efficacy in ultra-high temperature applications. Results suggest that
at temperatures above 1400 {\deg}C, although oxidation mechanisms remain
dominant, nitridation and reduction mechanisms may be appreciable enough to
require consideration. Supporting discussions regarding polymorphism and
microstructural influences are outlined.
