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Silicon Nitride Balls For Cryogenic BearingsResistance to wear greater than that of 440C steel. Experiments show lives of ball bearings immersed in liquid nitrogen or liquid oxygen increased significantly when 440C steel balls (running on 440C steel races) replaced by balls of silicon nitride. Developed for use at high temperatures, where lubrication poor or nonexistent. Best wear life of any bearing tested to date and ball material spalls without fracturing. Plans for future tests call for use of liquid oxygen as working fluid.
Document ID
19900000353
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Butner, Myles F.
(Rockwell International Corp.)
Ng, Lillian W.
(Rockwell International Corp.)
Date Acquired
August 14, 2013
Publication Date
July 1, 1990
Publication Information
Publication: NASA Tech Briefs
Volume: 14
Issue: 7
ISSN: 0145-319X
Subject Category
Mechanics
Report/Patent Number
MFS-29613
Accession Number
90B10353
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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