LUBRICITY PROPERTIES OF HIGH-TEMPERATURE JET FUELS.
Quarterly rept. no. 5, 15 May-15 Aug 66,
ESSO RESEARCH AND ENGINEERING CO LINDEN NJ PRODUCTS RESEARCH DIV
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The lubricity components most likely responsible for differences in jet fuels have been identified as high molecular weight aromatics. Commercial fuels having good lubricity are high in aromatics highly-refined fuels of poor lubricity are very low in aromatics. Such compounds as methyl-naphthalene greatly reduce friction and wear of poor lubricity fuels. In contrast, several high molecular weight sulfur compounds were relatively ineffective in the concentrations found in jet fuels. Also, removing organic acids did not greatly affect performance. Four-ball tests at 300 F rated fuels in the same order as at 97 F although the spread was greater. No unusual effects for temperature were noted. Lubricity additives were found to differ considerably from each other in their effectiveness at different concentrations. In most cases, incremental addition of additives gave an incremental improvement in performance all the way out to 1 concentration. A complex relationship has been found between oxygen availability, hydrocarbon type and lubricity. A paraffinic fuel showed a decrease in wear and friction when oxygen was removed, whereas an aromatic fuel showed the reverse.
- Lubricants and Hydraulic Fluids