In-cylinder wear and friction mitigation is essential for high-temperature, low-heat-rejection (LHR) engines. Under these extreme conditions, the piston ring/cylinder liner interface operates at oil-starved conditions. Surfaces Research has developed superior self-lubricating cylinder liner composite coatings containing novel solid lubricants to improve wear and friction under these conditions. These hard/soft coatings are two-phase, utilizing either metal or ceramic matrices with new solid lubricants. The solid lubricant phase lowers friction; the harder metal or ceramic matrix reduces wear. Our composite coatings successfully decrease both wear and friction in high-temperature oil-starved applications.
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