LUBRICITY PROPERTIES OF HIGH-TEMPERATURE JET FUELS
Quarterly rept. no. 6, 15 Aug-15 Nov 1966
ESSO RESEARCH AND ENGINEERING CO LINDEN NJ PRODUCTS RESEARCH DIV
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Humidity is as important as dissolved oxygen in its effect on friction and wear. For most pure hydrocarbons and all the commercial fuels, wear and friction increase with oxygen and moisture content, indicating that corrosive wear is the controlling mode of wear. Methyl naphthalene remains an anomaly. It gives very high wear and friction in a dry inert atmosphere. Both oxygen and water greatly reduce this wear. Differences among fuels are accentuated by high oxygen content, high humidity, high loads and high temperatures. In an inert atmosphere the effect of humidity, load and temperature is greatly diminished, and the difference among fuels is much less. Antioxidant additives do not appear to affect friction and wear. Lubricity additives such as oleic acid are effective in reducing corrosive wear but not elsewhere. Oleic acid does not reduce the wear of methyl naphthalene under any conditions. Work in the immediate future will continue to investigate the complex interaction between fuel composition, atmosphere and temperature.
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