Air-oxidation of a Co-based amorphous ribbon at 400-600 degrees C

作者：Kai W^*; Lin P C; Chen W S; Kao P C; Huang R T; Liaw P K

来源：Journal of Alloys and Compounds, 2011, 509: S179-S183.

DOI：10.1016/j.jallcom.2010.12.053

• Oxidation
• Co(69)B(12)Si(12)Fe(4)Mo(2)Ni(1) amorphous ribbon
• CoO

The oxidation behavior of a commercial Co(69)B(12)Si(12)Fe(4)Mo(2)Ni(1) amorphous ribbon (Co6-AR) was studied over the temperature range of 400-600 degrees C in dry air. The results showed that virtually no oxidation occurred at 400 degrees C. On the other hand, the oxidation kinetics of the Co6-AR alloy at 450-600 degrees C generally followed a multi-stage parabolic-rate law, and the parabolic-rate constants (k(p) values) tend to increase with increasing temperature. It was found that the oxidation rates of the glassy alloy are slower than those of pure Co, indicative of a better oxidation resistance. An exclusive scale of CoO was observed after the oxidation of the glassy alloy in the temperature range of interest, and several crystalline phases formed on the substrate beneath the scale, consisting of pure Co (both FCC and HCP structures), Co(3)B, Co(2)Si, CoFe, and Co(2)B (absent at 450 degrees C), which indicated the occurrence of crystallization.

• 出版日期2011-6