Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5457820 | International Journal of Refractory Metals and Hard Materials | 2017 | 29 Pages |
Abstract
The oxidation behavior of two alloys containing different content of Al and Cr from the Nb-Si-Ti-Hf-Al-Cr system has been evaluated at 1200 and 1250 °C. The alloy compositions in atomic percent are Nb-24Ti-16Si-2Hf-2Al-10Cr (B1), and Nb-24Ti-16Si-2Hf-6Al-17Cr (B2). The oxidation kinetic of B1 alloy at 1200 and 1250 °C followed a mixed parabolic-linear law, while the oxidation kinetic of B2 alloy at 1200 and 1250 °C followed a parabolic law. The weight gain of B2 alloy was 18.9 mg/cm2 after oxidation at 1200 °C for 100 h, which was a seventh of the value of that of B1 alloy. Besides, oxidation became more severe as temperature increased to 1250 °C. The oxide scales of B2 alloy consisted of CrNbO4, TiNb2O7 and SiO2, which were relatively compact and protective. In addition, the oxidation mechanism of Nb-Si based alloys were also discussed.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Linfen Su, Lina Jia, Kaiyong Jiang, Hu Zhang,