Effect of oxygen barrier coatings on oxidation and embrittlement of Ti-6Al-2Sn-4Zr-2Mo foil in heat shield applicationsBecause of the loss of ductility with exposure to oxidizing conditions, long time applications of titanium alloys have been limited to temperatures below 700 K and short time applications have been limited to temperatures below 815 K. Oxygen barrier coatings for shielding Ti-6Al-2Sn-4Zr-2Mo alloy from oxidation during exposure to high temperatures were studied using foil gage specimens. The coatings included micrometer-thick sputtered SiO2 and chemical-vapor-deposited silicate layers both with and without an aluminum basecoat. The oxidation rates and resistance to embrittlement of the coated specimens were significantly better than those of the uncoated specimens.
Document ID
19860054083
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Clark, R. K. (NASA Langley Research Center Hampton, VA, United States)
Unnam, J. (NASA Langley Research Center Hampton, VA, United States)
Wiedemann, K. E. (Analytical Services and Materials, Inc. Hampton, VA, United States)