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## Liquid cryogenic lubricant For some time there has been a need for reliable bearings for short term use, in cryogenic systems, particularly high speed rocket turbo-pumps. Now fluorinated polyethers have been shown to be suitable and effective lubricants for rolling element bearings in cryogenic systems. Their lubrication effectiveness is comparable to that of super-refined mineral oil lubricants operating at room temperature. A study and test programme were conducted using a different approach to the problem of lubrication in cryogenic systems. The new concept involved the use of liquid lubricants. To be an effective lubricant in a cryogenic system, a fluid must be a liquid in the cryogenic temperature range, capable of operating at the maximum system temperature without evaporating; it must be chemically insert, not susceptible to water absorption, and must have good heat transfer properties. Additionally such a fluid must be able to form a fluid film in the high pressure region of a rolling element contact. Four fluids, each having a different viscosity, were evaluated in two phases: first to compare the lubricating characteristics of fluorinated polyether fluids at outer race

Who reads Superconducting hydrides?

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0011-2275)

Published

1971

Language

EN

Field

Engineering (Physical Sciences)