LUBRICITY PROPERTIES OF HIGH-TEMPERATURE JET FUELS

Abstract
Scuffing, as distinct from wear, can be made to occur in the ball-on- cylinder device by going to 1000g load and 300F. It is evidenced by chattering during test and a pronounced wear track on the cylinder, easily visible with a surface roughness profile. Scuffing is more likely with highly-refined fuels and an atmosphere of wet air. Additives can inhibit scuffing but they differ in their effectiveness. Sulfur compounds have little or no effect at jet fuel concentrations. Abrasive wear is shown to be an important wear mechanism in the Vickers vane pump test. This is believed to be triggered by corrosive wear, which forms the abrasive iron oxide. Techniques have been worked out to obtain bone- dry conditions and measure accurately the water content. Scuffing of aromatics in argon tends to be inhibited by small amounts of water.

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