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High-temperature coating for titanium aluminides using the pack-cementation technique

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Abstract

The practical application of titanium aluminide metal-matrix composites (MMCs) at high temperatures requires suitable surface coatings to provide the needed oxidation resistance. Without a coating, the titanium aluminide alloys suffered from rapid oxidation attack at elevated temperatures, particularly under thermal cyclic conditions. The pack-cementation coating process was utilized to aluminize the surface region of a Ti3Al-base alloy to TiAl3, the most oxidation-resistant phase. With the existence of an adherent conversion coating, a thin protective alumina scale formed on the outer surface, and a significant improvement in the corrosion resistance was observed. Excellent coating efficiency and geometric flexibility were demonstrated in this study by the pack-cementation technique. Further development of the cementation process will focus on the elimination of surface cracking in the coating.

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Authors and Affiliations

  1. Universal Energy Systems, Inc., 4401 Dayton-Xenia Road, 45432, Dayton, Ohio

    Si -Cheng Kung

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  1. Si -Cheng Kung
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Kung, S.C. High-temperature coating for titanium aluminides using the pack-cementation technique. Oxid Met 34, 217–228 (1990). https://doi.org/10.1007/BF00665016

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  • DOI: https://doi.org/10.1007/BF00665016

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