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Chemical vapor deposition coatings for oxidation protection of titanium alloysResults of an experimental investigation of the oxidation protection afforded to Ti-14Al-21Nb and Ti-14Al-23Nb-2V titanium aluminides and Ti-17Mo-3Al-3Nb titanium alloy by aluminum-boron-silicon and boron-silicon coatings are presented. These coatings are applied by a combination of physical vapor deposition (PVD) and chemical vapor deposition (CVD) processes. The former is for the application of aluminum, and the latter is for codeposition of boron and silicon. Coating thickness is in the range of 2 to 7 microns, and coating weights are 0.6 to 2.0 mg/sq cm. Oxidation testing was performed in air at temperatures to 1255 K in both static and hypersonic flow environments. The degree of oxidation protection provided by the coatings is determined from weight change measurements made during the testing and post test compositional analyses. Temperature-dependent total normal emittance data are also presented for four coating/substrate combinations. Both types of coatings provided excellent oxidation protection for the exposure conditions of this investigation. Total normal emittances were greater than 0.80 in all cases.
Document ID
19930069941
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Cunnington, G. R.
(NASA Langley Research Center Hampton, VA, United States)
Robinson, J. C.
(Lockheed Missiles & Space Co., Inc. Palo Alto, CA, United States)
Clark, R. K.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1991
Publication Information
Publication: In: Damage and oxidation protection in high temperature composites. Vol. 1; Proceedings of the Symposium, 112th ASME Winter Annual Meeting, Atlanta, GA, Dec. 1-6, 1991 (A93-53937 23-24)
Publisher: American Society of Mechanical Engineers
Subject Category
Chemistry And Materials (General)
Accession Number
93A53938
Funding Number(s)
CONTRACT_GRANT: NAS1-18566
Distribution Limits
Public
Copyright
Other

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