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Two-layer thermal-barrier systems for Ni-Al-Mo alloy and effects of alloy thermal expansion on system lifeCyclic furnace and cyclic natural gas-oxygen torch rig tests were conducted to (1) identify a thermal-barrier system for a nickel-aluminum-molybdenum alloy, (2) study the oxidation of the bond coating, and (3) study the effect of the substrate coefficient of thermal expansion on thermal barrier system life. It is found that the latter is affected by the composition of the bond coating, yttria concentration in zirconia, and the coefficient of thermal expansion of the substrate material. In addition, small compositional changes in the bond and thermal barrier coatings have greater effect on thermal barrier system life than the 40% increase in the coefficient of thermal expansion of the substrate material. No simple relation exists between the weight gain caused by bond-coating oxidation with increasing yttria concentration in zirconia and increasing bond coating thickness on the one hand, and thermal barrier system life on the other.
Document ID
19820040090
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Stecura, S.
(NASA Lewis Research Center Surface Protection Branch, Cleveland, OH, United States)
Date Acquired
August 10, 2013
Publication Date
February 1, 1982
Subject Category
Metallic Materials
Report/Patent Number
ACS PAPER 4-C-81
Accession Number
82A23625
Distribution Limits
Public
Copyright
Other

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