Higher Operating Temperatures New Materials

o Surface - lubricant interactions o Surface finish o Substrate properties (physical)

ENGINE DESIGN CHANGES o Raised compression ring oo Higher contact stresses oo Higher operating temperatures phosphorus content vt distance from •cerakic* surface in hydrkarbon solvent

Cooling system - single fluid use Exhaust heat recovery oo Improved turbomachinery oo Bottoming cycle Alternate fuels

Higher contact stresses other bearing areas

EMISSIONS o Particulates o Nox phosphorus-based antinear agent has no significant affinity for surface z increase-—

distauce from surface

LUBRICANTS o Solids o Liquids o Vapor phase

HEA1 REJECTION vs. RING TEMPERATURE

HEA1 REJECTION vs. RING TEMPERATURE

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