Coatings for Mitigation of Mixed Mode Hot Corrosion and Oxidation
Abstract
UVA (Haydn Wadley, PI) will apply recently upgraded plasma assisted ~ electron beam vapor deposition techniques to the deposition of" marinized coatings for the mitigation of mixed mode hot corrosion and oxidation. An upgraded CPD approach will be used to deposit compositionally optimized Ni-Co-Cr-Al-Y/Hf coatings on Rene 80 and CMSX-4 flat coupons and tested in a Dean-rig set up as well as under oxidizing conditions at T>1000~C. Their resistance to oxidation and Types I and II hot corrosion will be compared with that of as deposited and shot peened and/or laser surface modified coatings developed under the base program. Dual layer (smart) coatings with" a Cr-enriched base layer to suppress diffusion with the substrate and an Al-, Si- and/or B-enriched outer layer to support protecti"ve scale growth at low and high use temperatures will also be deposited on the same substrates. The most successful coatings for each substrate alloy will then be subjected to Navy approved burner-rig test protocols that subject the coatings to the complex mixed degradation modes of hot corrosion and oxidation. The most promising coatings would also be deposited on burner rig pins of the engine manufacture~s (EM)-developed alloys using the process recipes developed for the Rene 80 and CMSX-4 pins. Their adherence to the su"bstrate, as well as their thickness, microstructure and composition will be characterized to ensure they meet the quality required f"or long term burner rig testing.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 29, 2017
- Source ID
- N000141712938
Entities
People
- H.N.G. Wadley
Organizations
- Office of Naval Research
- United States Navy
- University of Virginia