부산대학교 도서관

The thermal stability of aluminide coated and uncoated Ti-6Al-4V(Ti-64) titanium alloys in high temperature flame environmentshas been investigated. The pack cementation method was used to apply the aluminide coatings. The TiAl3layerwas formed after heat treatment of coated pure Titanium and Ti alloys at 500 °C–700 °C. After being exposed to a hightemperature flame, the uncoated titanium alloys formed TiO2and Al2O3,resulting in a significant weight gain and the lossof the original shape. However, when the aluminide coated titanium alloys were exposed to the flame, a thin layer of Al2O3was produced as a result of the flame exposure, and the coated specimens maintained their original shape in high temperatureflame environments when exposed at ~ 1360 °C for 15 min. The detailed mechanisms for flame resistance of coatedspecimens, as well as microstructural observations were examined. The temperature distribution of the specimen as well asthe stability of the coating layer under flame exposure were discussed systematically.