Encapsulated liquid lubricants for production of self-lubricating surfaces

Ruth Schmid1, Sergio Armada2, S├ębastien Equey2, Heidi Johnsen1 and Nuria Espallargas3
1SINTEF Materials and Chemistry, Department of Synthesis and Properties, N-7465 Trondheim, Norway; 2SINTEF Materials and Chemistry, Department of Mechanics and Corrosion, N-7465 Trondheim, Norway; 3NTNU, Department of Engineering Design and Materials, N-7491 Trondheim, Norway

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Summary
Self-healing materials and self-repairing systems are of great interest and importance in many industrial sectors. In this study, lubricant-filled microcapsules of polyurea were prepared and used in liquid-solid self-lubricating coatings. Various types and amounts of lubricants could be successfully encapsulated. A novel thermal spray coating process was developed in parallel, tailor-made for the use of these thermally labile capsules in high-temperature coating processes. Coatings of thermally sprayed lubricant-filled capsules were prepared and lubricant-release on demand showed in lab-scale scratch and tribological experiments. These novel liquid-solid coatings open for a new generation of self-repairing systems, avoiding unlubricated contacts in rotating/sliding parts and improving the lifetime of moving parts.

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