Abstract
In this work, the structure, morphology and oxidation behavior in air of ultrafine Cr particles prepared by the gas evaporation method are investigated, using TEM, HREM, XRD and TG. The ultrafine Cr particles are easily oxidized when directly exposed to air or even when combustion occurs. After a protective treatment, a thin oxide film is formed on the surfaces of the particles, which makes them stable in the air. The growth morphologies of the Cr particles depend on the size and intrinsic structure. The starting temperature of pronounced oxidation for ultrafine particles is much lower than that for coarse particles.
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