Open AccessThe influence of the chemical composition of the Fe-Cr-Al system coatings on the oxide films phase composition
Author(s) -
В. Г. Шморгун,
А. И. Богданов,
V. P. Kulevich,
В. О. Харламов
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/862/2/022059
Subject(s) - feal , oxide , materials science , phase (matter) , aluminium , chemical composition , chromium , composition (language) , chromium oxide , metastability , aluminium oxide , coating , metallurgy , chemical engineering , thin film , chemistry , nanotechnology , alloy , intermetallic , linguistics , philosophy , organic chemistry , engineering
The phase composition of the oxide films on the surface of the Fe-Cr-Al system coatings is studied using glancing angle X-ray diffraction. It is shown that at 900 °C the formed oxide films consist of αAl 2 O 3 and (FeCr) 2 O 3 , to which FeAl 2 O 4 oxide is added during long-term exposure. An increase in temperature to 1100 °C intensifies the growth of oxide films, and an increase in the aluminum content ensures a stable growth of αAl 2 O 3 and FeAl 2 O 4 oxides. When the aluminum content in the coating is more than 10 at. % at large exposure times, metastable alumina δAl 2 O 3 is formed, the formation of which is associated with a decrease in the concentration of chromium in thin surface layers.