The thermal diffusivity and conductivity of Fe3O4 scale have been determined with the laser flash method. Fe3O4 scale was provided by oxidation of iron plates at 823 K in Ar containing 0.84%H2 and 15.6%H2O. The scale was characterized by scanning electron microscopy and X-ray diffraction analysis for high temperature use to identify the phase of the scale. The thermal diffusivity and conductivity derived for the Fe3O4 scale decrease from 1.1 × 10-6 m2s-1 to 4.1 × 10-7 m2s-1 and from 3.5 Wm-1K-1 to 1.7 Wm-1K-1, respectively, with increasing temperature from room temperature to 676 K. The effective thermal conductivity of iron oxide scale with Fe3O4 has been evaluated assuming that Fe3O4 occupies 30% of the total scale thickness, suggesting the impact of the presence of Fe3O4 is about ten percent.
|出版ステータス||Published - 2022|
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