NDLI: Sliding durability of candidate seal fiber materials in hydrogen from 25 to 900 c

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Sliding durability of candidate seal fiber materials in hydrogen from 25 to 900 c

Content Provider	NASA Technical Reports Server (NTRS)
Author	Dellacorte, Christopher Steinetz, Bruce M.
Copyright Year	1992
Description	Sliding durability studies of candidate ceramic fibers were conducted in hydrogen to support the high temperature seal development program at NASA LeRC. Pin-on-disk tests were used to measure the friction and durability of a tow or bundle of ceramic fibers in sliding against a superalloy disk. This procedure was used previously to test candidate fibers in an air environment. The fibers based upon mullite (Al2O3-SiO2) chemistry (Nextel 550, 440, and 312) exhibited better durability in hydrogen than in air. HPZ, a complex silicon carboxynitride fiber which showed good durabilty in air, however, showed a significant loss of durability in hot hydrogen. These results are consistent with recent thermodynamic and experimental studies of ceramic compatibility with hydrogen at elevated temperatures. These research results indicate that only oxide fibers display good durability in both air and hydrogen environments. Also, simple, low cost testing in air can provide an adequate data base for initial seal material screening and selection, especially for oxide fiber candidates. The findings of this research provide critical input to the seal design team.
File Size	9164430
Page Count	19
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19930013401
Archival Resource Key	ark:/13960/t45q9v32r
Language	English
Publisher Date	1992-01-01
Access Restriction	Open
Subject Keyword	Thermodynamics Seals Stoppers Mullites Hydrogen Heat Resistant Alloys Sliding Contact Ceramic Fibers Durability High Temperature Environments Sliding Friction Aluminum Oxides Silicon Dioxide Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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