Abstract
By adding excess niobium to the molten metal pool of a rod-fed evaporation source in order to approximate a steady state condition, reproducible transfer of source material containing niobium, titanium, chromium, and aluminum has been achieved. Single source evaporative coating of this material has not been considered practical prior to this work because of the factor of 106 difference in vapor pressure between the most volatile element and the least volatile element. As produced, the coatings had a banded structure. A heat treatment homogenized the coatings. A model is suggested to explain the banded structure.
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