High performance coatings for titanium alloys to protect against oxidation

With a view to use titanium alloys more effectively at elevated temperatures, the oxidation and alpha case formation should be prevented. This can be achieved by the application of high performance oxidation resistant coatings on the titanium alloys. A high performance oxidation resistant coating, based on the combination of surface modification techniques, electro-deposition and pack aluminizing, has been successfully developed to protect the titanium alloy, IMI 834 from oxidation and alpha case formation. Negligible weight gain and elimination of the alpha case formation during the entire exposure period demonstrate the superior performance of platinum aluminide coating. The excellent behavior is due to the formation of a protective, adherent and continuous alumina scale on the surface of the coating. Based on the results obtained for both coated and uncoated alloys, the developed high performance coating can enhance the life of components fabricated from the titanium alloy, IMI 834 considerably by preventing oxidation and alpha case formation and thereby improve the efficiency of gas turbine compressor sections significantly