Vapor-Phase Formation of Submicron ZrO2-Coated Chromium Particles

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Abstract
Submicron particles of chromium, produced by evaporation and condensation at reduced pressure in a helium atmosphere, were entrained in a stream of helium where they were coated with ZrO2. Factors affecting the chromium-particle growth rate were evaporation temperature and inert-gas overpressure. A model of particle growth was formulated which predicted particle sizes which were in reasonable agreement with those produced experimentally. The difference noted by other investigators in particle size resulting from substitution of one inert gas for another is also explained by the model.
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