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FIGURE 2 Wear rate as a function of temperature for conventional piston ring and cylinder liner materials tested with a 15W40 CE/SF mineral oil based lubricant (Cameron plint data).

FIGURE 3 Friction coefficient as a function of temperature for two different oil supply rates (one drop every 10 or 100 seconds) conventional ring and liner materials, commerical 15W40 CE/SF mineral oil based lubricant.

FIGURE 4 friction temperature and liner and heavily engine-tested oil 15W40 CE/SF mineral lubricant).

The variation of coefficient with for conventional ring materials with fresh soot-loaded (commerical oil based ttfe of ttBfeie DInc fob LIN« MATIUtt

HfM PI lilt Dttl

Cr20J/Cr203/- • • Çr3Ç2/ËË*/L TiC/Cr3C2A fTC/COÇJ/L

Cr20J/Cr203/- • • Çr3Ç2/ËË*/L TiC/Cr3C2A fTC/COÇJ/L

FIGURE 5 Piston ring and cylinder liner wear coefficients measured for various Cameron Plint tests. Solid and dashed lines show variation of ring and liner wear with temperature for conventional materials (Cr plated ring, grey iron liner) with a commercial CE/SF 15W40 mineral oil based lubricant. Data points show wear coefficients for various ceramic coatings. The captions refer to the ring material. liner material and lubricant: - = Unlubricated. L = Commerical Polyol Ester Based Lubricant, L' = CE/SF 15W40 mineral oil based lubricant. Cr203 = Plasma sprayed chromium oxide, CR3C2 = Plasma sprayed chromium carbide. Tie = Plasma sprayed titanium carbide with CaF2, Ni, Cr, Fe, SCA = Silica-chromia-alumina dipped coating.

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