S. Chevalier et al., EFFECTS OF CHROMIA COATINGS ON THE HIGH-TEMPERATURE BEHAVIOR OF F17TISTAINLESS-STEEL IN AIR - EFFECT OF RARE-EARTH-ELEMENT OXIDES, Oxidation of metals, 47(1-2), 1997, pp. 53-67
The MOCVD technique was used to form thin films of chromia and/or of a
rare-earth-element oxide on the surface of F17Ti stainless-steel samp
les. These oxides were deposited alone oi together, successively or by
codeposition. Coated samples were then subjected to high-temperature
oxidation tests, either under isothermal conditions at 1273 K for 50 h
, or under cyclic conditions at 1223 K for 40 cycles. An improved oxid
ation behavior was observed in every case, especially with codeposited
Ln(2)O(3)-Cr2O3 Weight gain decreased during oxidation, compared with
an uncoated sample, and scale spallation, generally observed under cy
clic conditions, disappeared. Longer time experiments were also carrie
d out. Large differences were observed depending on the sample-surface
treatment.