Abstract
Mixtures of zirconium and carbon powders in various atomic fractions (5–75 at.% of C) were ground in a planetary ball mill. When the mixtures thus activated mechanically were transferred into a graphite crucible and exposed to air, they ignited spontaneously and the self-propagating high-temperature synthesis (SHS) took place in two successive steps. Zirconium carbide and zirconium nitride were formed, depending on the initial C concentration. The almost stoichiometric ZrC was formed in air from the ZrC powder mixtures with C = 50–60 at.%. From the measurement of the lattice constant and X-ray photoelectron spectroscopy (XPS) spectra, the formation of solid solutions between ZrC and ZrN was also estimated. A possible reaction mechanism for the formation of the zirconium carbide and nitride is discussed.
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