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In this paper, we will demonstrate the effectiveness and usefulness of a new class of superlow-friction carbon films in alleviating the wear and scuffing problems associated with the use of low-sulfur diesel fuels in fuel delivery systems of advanced diesel engines. Specifically, using a well-established diesel fuel lubricity test machine, we will show that with the use of very thin (1 μm thick), super lubricious carbon films, one can restore lubricity and virtually eliminate scuffing and potential wear failures that can occur in low-sulfur, super-clean, and zero-sulfur (Fischer-Tropsch) diesel fuels. Test results from our study raise the prospect for using such carbon coatings to solve problems associated with the use of low-sulfur diesel fuels and high injection pressures in future engines.

In an effort to reduce fuel consumption and emissions, hybrid vehicles incorporating fuel cell systems are being developed by automotive manufacturers, their suppliers, federal agencies (specifically, the U.S. Department of Energy) and national laboratories. The fuel cell system will require an air management subsystem that includes a compressor/expander. Certain components in the compressor will require innovative lubrication technology in order to reduce parasitic energy losses and improve their reliability and durability. One such component is the air bearing for air turbocompressors designed and fabricated by Meruit, Inc. Argonne National Laboratory recently developed a carbon-based coating with low friction and wear attributes; this near-frictionless-carbon (NFC) coating is a potential candidate for use in turbocompressor air bearings. We presents here an evaluation of the Argonne coating for air compressor thrust bearings.