Effect of Pre-Oxidation on the High Temperature Oxidation Behavior of Fe-Cr-Al Powder Porous Metal

Abstract:

This study investigated the effect of pre-oxidation on the high-temperature oxidation behavior of Fe-Cr-Al powder porous metal. Using the powder metallurgy process, Fe-Cr-Al powder porous metals with and without pre-oxidation were manufactured. 24-hour TGA tests were conducted at three different temperatures: 900°C, 1000°C, and 1100°C. The high temperature oxidation results showed that pre-oxidized powder porous metal had even higher levels of oxidation resistance compared to that of porous metal without pre-oxidation regardless of the oxidation temperature. The weight gain of pre-oxidized porous metal (0.123%) was lowest at oxidation temperature of 900°C. In contrast, the weight gain of porous metals significantly increased at 1100°C. In the porous metals 900°C and 1000°C oxidized specimen, oxides such as Al₂O₃ and Cr₂O₃ were mainly observed. Porous metals oxidation specimen at 1100°C also revealed the presence of Fe-based oxides in large quantities in addition to the oxides formed at lower temperature.

• Periodical: Advanced Materials Research (Volumes 690-693)
• Pages: 294-297
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.690-693.294
• Online since: May 2013
• Authors: Jae Sung Oh, Seon Hui Lim, Sung Hwan Choi, Man Ho Park, Kee Ahn Lee
• Keywords: Fecralloy, High Temperature Oxidation, Powder Porous Metal, Pre-Oxidation

References

[1] L.J. Gibson and M.F. Ashby: Cellular solids: Structure and Properties, 2nd Ed.(Cambridge University Press, Cambridge, U.K., 1997)

[2] J. Banhart: Pro. Mater. Sci. Vol.46 (2001), p.559

[3] G.J. Davies, S. Zhen: Jour. Mater. Sci. Vol.18 (1983), p.1899

[4] J. Choi and K. Kim: J. Korean Powder metal. Inst. Vol.17 (2010), p.489

[5] S.H. Choi, S.Y. Kim, J.Y. Yun, Y.M. Kong, B.K. Kim and K.A. Lee: Met. Mater. Int. Vol.17 (2011), p.301