Surface Processing for Enhanced Environmental and Creep-Fatigue Resistance

Period of Performance: 01/07/2008 - 01/07/2009


Phase 1 SBIR

Recipient Firm

Directed Vapor Technologies Internationa
2 Boars Head Ln Array
Charlottesville, VA 22903
Principal Investigator


The ongoing drive to increase the performance and efficiency of propulsion systems has led to increasingly severe operating environments, particularly for the components in the hot sections of turbine engines. One potential life-limiting area of future engines is the turbine disk where significant dwell fatigue may occur if engine temperatures are elevated. The mechanism for this reduction is not fully clear but is related to effects of grain boundary creep and surface oxidation / corrosion. The study proposed here will seek to develop advanced surface chemistry and modification techniques for the nickel-base superalloys used for turbine disks to limit dwell fatigue damage and promote higher operating temperatures in the engine. Key factors that will be studied include: (i) computational approaches to designing novel coating compositions that exhibit minimal interdiffusion and hence excellent compatibility with the substrate owing to chemical activity matching; (ii) the deposition, oxidation and compatibility testing of selected compositions; and (iii) the deposition of selected coated systems. Preliminary mechanical testing of the coated systems will be carried out. A targeted significant outcome of this study is the establishment of novel and cost-effective surface modifications that confer greatly improved component reliability and durability.