| 摘要 |
Unleaded aviation gasolines of enhanced properties are described. They satisfy at least the octane and heat content specifications of ASTM D 910-90. Also described are unleaded aviation gasolines which satisfy all of the specifications of ASTM D 910-90. The fuels also prevent or at least inhibit exhaust valve recession or wear during use in aviation engines, especially those designed to operate on leaded aviation fuel. The fuels of the invention contain a cyclopentadienyl manganese tricarbonyl compound. Preferably the fuels are made up of a blend of at least about 80% by volume of aviation alkylate gasoline, up to about 10% by volume of a gasoline-soluble dialkyl ether gasoline blending agent, from about 0.25 to about 0.60 grams of manganese per gallon as at least one cyclopentadienyl manganese tricarbonyl compound, and optionally up to about 15% by volume of aromatic gasoline hydrocarbons, these being proportioned such that the fuel possesses at least the octane qualities and heat contents called for by ASTM Specification D 910-90.
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