145

N.B. test speed is very important at room temperature (EHD -ยป boundary transition)

Table III - List of Ring and Liner Coatings Tested in Uncooled NTC-250 Engine

Piston Ring Coatings Cylinder Liner Coatings

Tribaloy Cr203

TiC cr2c3

Cr2C3 Kaman SCA (Cr203 Based)

Cr203 A1203

Al203/Ti02 SiC

vc Tribaloy

TiN NiCr/Al203

Table IV - Best Coating Combinations Found in Uncooled NTC-250 Tests

Piston Ring Coatings Cylinder Liner Coatings

Cr203 Cr2o3

Cr203 Kaman SCA (Cr203 Based)

Cr2C3 Cr203

Tribaloy Tribaloy

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