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#21
07-29-2010, 08:59 PM
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http://en.wikipedia.org/wiki/Graphite
"Graphite and graphite powder are valued in industrial applications for its self-lubricating and dry lubricating properties. There is a common belief that graphite's lubricating properties are solely due to the loose interlamellar coupling between sheets in the structure.[9] However, it has been shown that in a vacuum environment (such as in technologies for use in space), GRAPHITE IS A VERY POOR LUBRICANT. This observation led to the discovery that the lubrication is due to the presence of fluids between the layers, such as air and water, which are naturally adsorbed from the environment. This molecular property is unlike other layered, dry lubricants such as molybdenum disulfide. Recent studies suggest that an effect called superlubricity can also account for graphite's lubricating properties." Tom Vaught
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