NDLI: Tribological properties of ceramic/ti3al-nb sliding couples for use as candidate seal materials to 700 deg c

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Tribological properties of ceramic/ti3al-nb sliding couples for use as candidate seal materials to 700 deg c

Content Provider	NASA Technical Reports Server (NTRS)
Author	Dellacorte, Christopher Steinetz, Bruce M. Brindley, Pamela K.
Copyright Year	1989
Description	Tribological properties of Ti3Al-Nb intermetallic disks sliding against alumina-boria-silicate fabric were ascertained in air at temperatures from 25 to 700 C. These materials are candidates for sliding seal applications for the National AeroSpace Plane. The tests were done using a pin on disk tribometer. Sliding was unidirectional at 0.27 m/sec under a nominal contact stress of 340 kPa. Gold sputter or ion plating deposited films were used to reduce friction and wear. Rhodium and palladium films were used beneath the gold lubricating films to prevent diffusion of the substrate into the gold at high temperature. The friction and wear of the unlubricated specimens was unacceptable. Friction coefficients were generally greater than 1.0. The ion plated gold films, when used with a rhodium diffusion barrier reduced friction by almost a factor of 2. Wear was also substantially reduced. The sputter deposited films were not adherent unless the substrate was sputter cleaned immediately prior to film deposition. Palladium did not function as a diffusion barrier.
File Size	823856
Page Count	22
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19900003342
Archival Resource Key	ark:/13960/t01022p2m
Language	English
Publisher Date	1989-01-01
Access Restriction	Open
Subject Keyword	Aerospace Planes Aluminum Ceramics Coefficient of Friction Refractory Materials Titanium Alloys Seals Stoppers Metal Films Niobium Compounds Temperature Effects Wear Resistance Lubrication Sliding Friction Tribology 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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