Titanium Aluminides for Metallic Thermal Protection System of Reusable Space Transportation Vehicle: A Review

Gamma phase based two phase (+2) titanium aluminides have promising potential as high temperature structural materials particularly for aerospace systems due to light weight. They are potential candidate materials for metallic thermal protection system (MTPS) of reentry vehicles. Limitations with respect to processing have been reported due to poor formability below 700 0 C. However, different specialized techniques have been evolved to realize the material in various forms. The present paper brings out the candidature of this material (two phase +2, titanium aluminides) for MTPS and discusses the different processing options. Viable process route is also discussed to obtain thin sheets for MTPS.