NDLI: Performance evaluations of ceramic wafer seals

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Performance evaluations of ceramic wafer seals

Content Provider	NASA Technical Reports Server (NTRS)
Author	Dunlap Jr., Patrick H. Steinetz, Bruce M. DeMange, Jeffrey J.
Copyright Year	2006
Description	Future hypersonic vehicles will require high temperature, dynamic seals in advanced ramjet/scramjet engines and on the vehicle airframe to seal the perimeters of movable panels, flaps, and doors. Seal temperatures in these locations can exceed 2000 F, especially when the seals are in contact with hot ceramic matrix composite sealing surfaces. NASA Glenn Research Center is developing advanced ceramic wafer seals to meet the needs of these applications. High temperature scrub tests performed between silicon nitride wafers and carbon-silicon carbide rub surfaces revealed high friction forces and evidence of material transfer from the rub surfaces to the wafer seals. Stickage between adjacent wafers was also observed after testing. Several design changes to the wafer seals were evaluated as possible solutions to these concerns. Wafers with recessed sides were evaluated as a potential means of reducing friction between adjacent wafers. Alternative wafer materials are also being considered as a means of reducing friction between the seals and their sealing surfaces and because the baseline silicon nitride wafer material (AS800) is no longer commercially available.
File Size	880276
Page Count	20
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20060056246
Archival Resource Key	ark:/13960/t4vj0hh60
Language	English
Publisher Date	2006-12-01
Access Restriction	Open
Subject Keyword	Composite Materials Panels Scanning Electron Microscopy Ceramic Matrix Composites Propulsion System Performance Supersonic Combustion Ramjet Engines Flow Measurement High Temperature Mechanical Engineering Hypersonic Vehicles Seals Stoppers Airframes Wafers Silicon Nitrides Cross Sections Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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