A Study of the Oxidation of Gd-Doped FeCrAl in 1000 °C Steam Environments.

Autor: Liu, Riu, Sun, Hongliang, Guo, Qianqian, Jiang, Minjin, Jiang, Xiaosong
Předmět:
Zdroj: Journal of Materials Engineering & Performance; Feb2023, Vol. 32 Issue 3, p978-992, 15p
Abstrakt: This study investigated the isothermal oxidation behavior of FeCrAl-(0, 1, 2, 4) wt.% Gd alloys when prepared by spark plasma sintering at 1000 °C in steam. When doped with Gd, the FeCrAl alloy oxidation kinetics significantly improved and showed excellent resistance to high-temperature steam oxidation. The 1.0 Gd alloy gained the least mass (0.32 mg/cm2) and the oxide scale was thinnest (1.9 ± 0.2 μm) after the FeCrAl alloy was treated in steam for 100 h. However, when Gd content is more than 1 wt.%, the oxidation resistance of the alloy decreases at high temperature, but it is still better than that of the alloy without Gd. The oxide layer of FeCrAl-(0, 1, 2, 4) wt.% Gd alloy was mainly Al2O3 and Gd doping slightly inhibited growth in Al2O3 oxide layer. Gd-rich particles were dispersed in the matrix, reducing the diffusion rate of oxygen and inhibiting the outward diffusion of Al. This reduced the growth rate and also the spallation rate of the oxide skin on the FeCrAl alloy. Gd reduced the oxidation rate of the alloy by changing the diffusion process of the oxide layer. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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