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Thin coatings for protecting titanium aluminides in high-temperature oxidizing environmentsTitanium aluminides have high specific strengths at high temperatures but are susceptible to environmental attack. Their use in many aerospace applications would require that they be protected with coatings that, for structural efficiency, must be thin. It is conceivable that acceptable coatings might be found in several oxide systems, and consequently, oxide coatings of many compositions were prepared from sol-gels for study. Response-surface methodology was used to refine coating compositions and factorial experiments were used to develop coating strategies. Oxygen permeability diagrams of two-layer coatings for several oxide systems, an analysis of multiple-layer coatings on rough and polished surfaces, and modeling of the oxidation weight gain are presented.
Document ID
19930029612
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Wiedemann, K. E.
(NASA Langley Research Center Hampton, VA, United States)
Taylor, P. J.
(Analytical Services and Materials, Inc. Hampton, VA, United States)
Clark, R. K.
(NASA Langley Research Center Hampton, VA, United States)
Wallace, T. A.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Publication Information
Publication: In: Environmental effects on advanced materials (A93-13601 02-23)
Publisher: Minerals, Metals & Materials Society
Subject Category
Metallic Materials
Accession Number
93A13609
Distribution Limits
Public
Copyright
Other

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