Emittance of Boehmite and Alumina Films on 6061 Aluminum Alloy Between 295 and 773 K

[+] Author and Article Information
T. G. Kollie, T. D. Radcliff, F. J. Weaver

Oak Ridge National Laboratory, Oak Ridge, TN 37831-6092

J. Heat Transfer 113(1), 185-189 (Feb 01, 1991) (5 pages) doi:10.1115/1.2910523 History: Received November 27, 1989; Revised May 15, 1990; Online May 23, 2008


The total hemispherical emittance of an oxide film that formed on 6061-T6 aluminum alloy parts in the Tower Shielding Reactor-II at Oak Ridge National Laboratory was measured from 295 to 773 K using an emissometer and/or a calorimeter. The emittance of this film was critically needed for heat transfer calculations in a simulated loss-of-coolant accident of the reactor. X-ray diffraction analysis identified the film as boehmite (Al2 O3 ·H2 O), which dehydrated to alumina (Al2 O3 ) upon heating above 473 K. The measured emittances for the alumina film are in excellent agreement with published values for anodized aluminum films and for bulk alumina. Published values of the emittance of boehmite could not be found for comparison, but evidence is presented that some anodization processes for aluminum yield boehmite and not alumina films.

Copyright © 1991 by The American Society of Mechanical Engineers
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