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Coatings 2018, 8(3), 113; https://doi.org/10.3390/coatings8030113

The Influence of Aluminizing Process on the Surface Condition and Oxidation Resistance of Ti–45Al–8Nb–0.5(B, C) Alloy

1
Faculty of Materials Engineering and Metallurgy, Institute of Materials Engineering, 40-019 Katowice, Poland
2
Institute for Ferrous Metallurgy, 44-100 Gliwice, Poland
*
Author to whom correspondence should be addressed.
Received: 3 March 2018 / Revised: 17 March 2018 / Accepted: 19 March 2018 / Published: 20 March 2018
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Abstract

One of the major barriers limiting the suitability of TiAl intermetallic alloys for use in the demanding aircraft and automotive industries is their susceptibility to degradation as a result of oxidation at temperatures exceeding 760 °C. Paper presents the characteristics of resistance to cyclic oxidation at 950 °C for Ti–45Al–8Nb–0.5(B, C) alloy with and without protective coating obtained as a result of aluminizing using out of pack method. The characteristics of surface condition were determined by scanning electron microscope with EDS system, transmission electron microscope, and X-ray diffractometer. The favorable behavior of the Ti–45Al–8Nb–0.5(B, C) alloy with a protective coating under cyclic oxidation conditions is a result of a higher content of Al2O3 in the microstructure of the scale and the presence of Al and Nb-rich phases at the substrate interface, which probably constitue a barrier for oxidation process. The high temperature oxidation test revealed that aluminide coating was responsible for a remarkable improvement in the oxidation resistance. View Full-Text
Keywords: TiAl–based alloys; aluminide coating; aluminization process; cyclic oxidation resistance; surface characterization TiAl–based alloys; aluminide coating; aluminization process; cyclic oxidation resistance; surface characterization
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Szkliniarz, W.; Moskal, G.; Szkliniarz, A.; Swadźba, R. The Influence of Aluminizing Process on the Surface Condition and Oxidation Resistance of Ti–45Al–8Nb–0.5(B, C) Alloy. Coatings 2018, 8, 113.

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