The bearings for a gimbal of a cryogenic upper stage rocket engine are highly loaded, exposed to corrosive environment and have to cope with a wide temperature range down to cryogenic temperatures. "Cronidur 30" steel was chosen for the bearing material. To satisfy the demand of low friction moment under these conditions a tribological concept should be found. This paper describes the selection process for the tribological concept suitable for this specific application that resulted in the selection of sputtered lead as lubricant for the gimbal bearings.
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