Evaluation of High Temperature Lubricants in Ceramic/Metal and Metal/Metal Contacts

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Abstract
The tribological performance of high temperature lubricants was investigated in cast iron/cast iron, cast iron/Si3N4, and cast iron/Cr2O3-coated cast iron contacts. Three formulated polyolester-based lubricants, PE-A, PE-B, and PE-4L were evaluated from room temperature to 400°C using a reciprocating wear tester. PE-A showed an increase of wear volume above 300°C, and PE-B, which has higher viscosity than PE-A, showed an increase of wear volume around 250°C in the cast iron/cast iron contact. PE-4L showed an increase of wear volume around 200°C. The presence of sulfur on the wear tested specimens coincided with the increase of wear volume. Cast iron/Si3N4, Ra = 0.05 μn pair tested with PE-A showed the lowest wear volume and friction coefficients. The presence of iron, or iron oxide, on the wear-tested Si3N4 was observed at 300°C indicating a transfer of cast iron to the Si3N4. The presence of a thick carbon layer and a thin carbon layer on the cast iron tested against S13N4, Ra =0.05 μm, at 300°C with PE-B and PE-A, respectively, showed an earlier breakdown of PE-B than PE-A.

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