Patent ID: 6599636
Filing Date: 2003-07-29
Classification: C23C,Y02T,Y10S

Abstract:
A process for forming a specific reactive element bilayer barrier on a titanium aluminide substrate, the process comprising:creating a hydrogen atmosphere with a concentration of water vapor below 750 ppm at a temperature above about 550Â° C. contiguous to a surface of the titanium aluminide substrate on which the barrier layer is to be formed; maintaining the temperature above 550Â° C. and water vapor concentration below 750 ppm; and reacting the gaseous hydrogen/water vapor atmosphere with specific reactive elements at the titanium aluminide substrate surface and with oxygen to form a specific reactive element oxide barrier layer which is strongly bonded to the substrate surface, said barrier layer having an aluminum oxide layer at a substrate/barrier layer interface and a titanium oxide layer at a barrier layer/gas interface.