DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY
False-colour scanning electron micrograph of the surface of a lubricating film of molybdenum disulphide from a dry film anti-scuffing aerosol spray. The spray contains the lubricant, a volatile organic solvent and a small amount of bonding resin. The solvent quickly evaporates, leaving a layer of randomly- dried rings of molybdenum disulphide (as seen here). These raised rings are gradually abraded with use, slowly smearing out to produce a thin film. Dry film lubricants have several advantages over oils; they do not pick up dust, can be used to higher temperatures and do not tend to contaminate other parts. Magnification: x130 at 35mm size.
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