L. O. Vatamanu, NanoVAT Inc. and ITT Technical Institute, Lakewood, OH; A. Sherman, Powdermet Inc., Euclid, OH
This reseach paper demonstrated an innovative manufacturing technique to produce a strengthened niobium, vanadium alloyed gamma-titanium aluminide with impoved room temperatue ductility and fracture oxidation resistance. Controlled nanoengineered microencapsulated composite structures by powder metallurgy processing route have been investigated. FBCVD coating and HIP processes allowed major improvement for these intermetalllic microstructures for high temperature application in aerospace industry as turbine engines, airframe structures and thermal protection systems. Effect of variables as deposition cycles, precursors feeding rate, carrier gas and helium feed rate, weight of the CVD Bed, particle size, deposition temperature, coating thickness on Nb and V coatings have been studyed. Have been analyzed also the morphology, density, surface area, particle size and microstructure of the TiAl/Nb composite components and the mechanical properties. The project demostrated that the proposed approach is a technically and economically feasable route to improve the gamma Ti-Al.
