S. Chevalier et al., INFLUENCE OF A REACTIVE ELEMENT OXIDE COATING ON THE HIGH-TEMPERATUREOXIDATION OF CHROMIA-FORMER ALLOYS, Journal de chimie physique et de physico-chimie biologique, 95(9), 1998, pp. 2083-2101
MOCVD technique was used to deposit Nd2O3 coatings on two chromia-form
ers alloys. Oxidation experiments were performed at 1000 degrees C und
er air at atmospheric pressure on uncoated alloys and Nd2O3-coated all
oys. The beneficial effects generally ascribed to the reactive element
s were confirmed : the oxidation rates were decreased and the adherenc
e of the oxide scales was drastically improved. The reactive element w
as located at the top of the oxide scale after oxidation. X-ray diffra
ction measurements identified NdCrO3 as the phase containing the react
ive element, This work is compared to a previous study [1] concerning
the influence of Nd2O3 on the high temperature oxidation behaviour of
a Ti-containing chromia-former alloy in the oxide scale of which a com
plex phase close to CeTi21O38 was characterized.