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Long-Term Cyclic Oxidation Behavior of Uncoated and Coated Re-108 and In-939 at 980 and 870 CVery long-term cyclic oxidation behavior of Re108 and In939 with and without a protective coating was evaluated at 980 and 870 C, respectively. Re-108 and In-939 without a protective coating began to show a rapid weight loss at 3000 h due to scale spallation, indicating the need for an oxidation protective coating for longer than thousands of hours of oxidative life. NiAl-base coatings of a vapor phase aluminide (VPA), a pack aluminide (CODEP), and a slurry paint aluminide (SERMALOY J) were applied on Re-108 and In-939. The VPA and CODEP on Re-108 and all three coatings on In-939 showed excellent cyclic oxidation resistance out to 10,000 h. Coated alloys were annealed in an inert atmosphere to determine the loss of Al from the coating into the alloy substrate through diffusion. The Al loss from the coating through diffusion was twice as great as the Al loss through oxidation after 10,000 h of cyclic exposure. The oxidation life of VPA-coated Re-108 was estimated by calculating the amount of Al initially available for protective oxidation and the amount of Al lost through oxidation and diffusion.
Document ID
20010059383
Acquisition Source
Glenn Research Center
Document Type
Reprint (Version printed in journal)
Authors
Lee, K. N.
(NASA Glenn Research Center Cleveland, OH United States)
Barrett, C. A.
(NASA Glenn Research Center Cleveland, OH United States)
Smith, J.
(DYNACS Engineering Co., Inc. Cleveland, OH United States)
Date Acquired
August 20, 2013
Publication Date
March 1, 2000
Publication Information
Publication: Journal of Thermal Spray Technology
Publisher: ASM International
Volume: 9
Issue: 1
Subject Category
Metals And Metallic Materials
Distribution Limits
Public
Copyright
Other

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