Clean Power

Published on September 24th, 2012 | by James Ayre


Metal Surface Developed That Can Self-Repair

September 24th, 2012 by  

Metal surfaces may soon have the ability to repair themselves thanks to a newly designed ‘coating’ that is filled with tiny lubricant capsules.


A group of researchers from SINTEF and the Norwegian University of Science and Technology (NTNU) have spent most of the last two years developing “ground-breaking expertise in coatings and thermal spraying. The researchers are now testing whether it is possible — where two metal surfaces are in contact with each other — to apply a coating to the surfaces formed of hard particles and capsules filled with liquid lubricant.”

There are many types of machinery that depend on being lubricated at all times — if a leak occurs and causes the moving parts to dry out, that creates huge damage and massive costs to repair. The metal surfaces will grate against each other and eventually seize up, sometimes resulting in the complete junking of the machinery.

As an example, wind turbines have very high maintenance costs — “overhaul of their mechanical components alone accounts for 30 per cent.” And I imagine those costs go up substantially for the offshore wind power market. A technology like this could potentially lead to huge cost savings for wind power providers.

To create the surface, the researchers “apply the lubricant using a thermal spray technique, where powder and capsules are fired at the surface using a flame,” says Sergio Armada of SINTEF Materials and Chemistry. “When the metal surfaces come into contact with each other, the coating is broken down in a controlled manner, releasing the contents of the capsules, and the lubricant will then prevent further friction.”

To test the material, the researchers have done a number of tests using slide bearings in industrial settings, measuring the friction on surfaces with the capsules and without them. “When a coating without capsules was applied to the slide bearing, the friction coefficient was 0.7, while friction was reduced to 0.15 in bearings coated with a layer of capsules.”

The researchers think that this coating also has uses in the medical sector, especially in joint replacements.

Source: SINTEF
Image Credits: SINTEF

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About the Author

's background is predominantly in geopolitics and history, but he has an obsessive interest in pretty much everything. After an early life spent in the Imperial Free City of Dortmund, James followed the river Ruhr to Cofbuokheim, where he attended the University of Astnide. And where he also briefly considered entering the coal mining business. He currently writes for a living, on a broad variety of subjects, ranging from science, to politics, to military history, to renewable energy. You can follow his work on Google+.

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