Foil air bearing load capacity tests were conducted to investigate if a solid lubricant coating applied to the surface of the bearing's top foil can function as a break-in coating. Two foil coating materials, a conventional soft polymer film (polyimide) and a hard ceramic (alumina), were independently evaluated against as-ground and worn (run-in) journals coated with NASA PS304, a high-temperature solid lubricant composite coating. The foil coatings were evaluated at ...
Reciprocating wear tests were performed to investigate the effects of honing on the wear of ceramic coated piston rings and cylinder liners. The baseline or control cases consisted of testing ceramic coated rings against ceramic coated liner specimens whose surfaces were ground and lapped smooth. A second series of tests were performed with liner specimens with base and plateau honed surfaces. Test conditions were chosen to simulate ...
A tribological test method has been developed to assess candidate high temperature piston ring and cylinder liner coatings for advanced heavy duty diesel engines. A reciprocating test rig is employed to reproduce the boundary lubricated conditions existing at the piston ring-cylinder liner interface during top ring reversal (TRR). The test specimens are fabricated from commercially available piston rings and cylinder liners to facilitate direct comparisons with current diesel engines. A ...
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