Knowing A Little Bit More About Functions Of Graphite Lubricant: Ideal Lubricant To Reduce Friction In Different Purposes
by Chris on February 15, 2010
Graphite is a version of carbon, that is silvery black in colour. Graphite is among the predominant materials used as solid lubricant. The lamellar structure of graphite (the tendency to flake), in the form of dry powder, makes it suitable to reduce friction. Graphite may also work as a liquid based lubricant. The lubrication film gives resistance to deterioration and also seizure resistance.
Being a dry lubricant, the powdered graphite reacts with vapour and the molecular bonding does not occur, leaving it dry and slippery. However, it doesn't bond well with the surface and thus keeps falling off, increasing the necessity to be applied often. Solid graphite lubricant is tolerant to temps of about 900 degree F. Higher temperatures than this leads to oxidation of graphite.
The liquid graphite lubricant is of various kinds. The graphite grease is produced to stick to the surface, where the grease will prevent the graphite from falling off the work surface. One more combination of graphite lubricants with liquid base is such that the liquid will evaporate when the combination is painted on the surface, leaving the graphite to work to decrease friction.
As a dry lubricant, graphite might be utilised in some situations where wet lubricants may contribute to hazard as in electrical fittings or when lubricating substances like wood. Also, graphite grease can tolerate higher heat than standard grease or any other lubricants.
Graphite could be used as an additive in lubricating oil to raise the thermal tolerance. They're also used as components of polymer based composite anti-friction coatings and form the second stage particles of metal based composite anti-friction coatings. They're used as molds for continual casting and solid lubricant in metal forming.
Graphite is also utilised in continuous casting molds. The molds are forged from iso-statically pressed graphite. The low friction among the mold surface and solidifying metal guarantees smooth extraction of the casting. The crystal structure of graphite provides low friction without the requirement of extra lubrication.
Graphite is characterized as organic and artificial. Organic graphite comes from mining. The purified graphite is consists of carbon, sulfur, SiO2 and Ash. The crystallizing quality of graphite is determined by the higher content of carbon, and better the lubricity and resistance to oxidation. Artificial graphite is sintered from high temperature and has very high carbon content of up to 99.5-99.9%, and is thus extremely good as a lubricant.
While the traditional auto oils can not withstand the high temps, graphite can serve as lubricants in automotive engines which reach temps as high as 1,250 degree F. The commercially available graphite lubricant is a colloidal dispersion of billions of microscopic particles of graphite. When this is placed in the crankcase of an engine, it functions with the motor oil to decrease friction. It also penetrates efficiently into parts where oil can't reach, keeps oil from thickening, improves compression and helps energy use and fuel economy.
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