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Characterization, shaping, and joining of SiC/superalloy sheet for exhaust system componentsHafnium carbide was shown to be virtually inert when in contact with silicon carbide and Waspaloy for at least 200 hr at 1093 C (2000 F). Extensive interaction was noted with other superalloys such as HA-188. A continuous CVD HfC deposition process was developed for deposition of up to 8 microns on .14 mm (.0056 in.) SiC tungsten core filament at rates as high as .6 m/min. The rate can be increased by increasing the length of the reactor and the output of the power supply used in resistive heating of the filament substrate. The strength of HfC coated filament varies with thickness in a Griffith-like manner. This strength reduction was greater for HfC coatings than for tungsten coatings, presumably because of the greater ductility of tungsten.
Document ID
19780005191
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Cornie, J. A.
(Westinghouse Electric Corp. Pittsburgh, PA, United States)
Date Acquired
September 3, 2013
Publication Date
July 20, 1977
Subject Category
Composite Materials
Report/Patent Number
NASA-CR-135301
REPT-9D4-NASIC-R1
Report Number: NASA-CR-135301
Report Number: REPT-9D4-NASIC-R1
Accession Number
78N13134
Funding Number(s)
CONTRACT_GRANT: NAS3-19735
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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