Knowing A Bit More About Functions Of Graphite Lubricant: Appropriate Lubricant To Decrease Friction In Various Purposes
Graphite is a form of carbon, that is silvery black in colour. Graphite is among the popular materials used as solid lubricant. The lamellar structure of graphite (the tendency to flake), in the form of dry powder, makes it ideal to reduce friction. Graphite may also work as a liquid based lubricant. The lubrication film provides resistance to wear and tear and also seizure resistance.
Being a dry lubricant, the powdered graphite reacts with vapour and the molecular bonding doesn't occur, leaving it dry and slippery. However, it does not 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 causes oxidation of graphite.
The liquid graphite lubricant is of different kinds. The graphite grease is produced to attach to the surface, where the grease will prevent the graphite from falling off the work surface. Another 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 could be used in some situations where wet lubricants may contribute to danger as in electrical fittings or when lubricating substances such as wood. Also, graphite grease can tolerate higher heat than standard grease or other lubricants.
Graphite may be used as an additive in lubricating oil to raise the thermal tolerance. They're also used as ingredient of polymer based composite anti-friction coatings and form the second phase 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 used in continuous casting molds. The molds are fabricated 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 offers low friction without the requirement of additional lubrication.
Graphite is characterized as organic and artificial. Natural graphite is derived from mining. The purified graphite is consists of carbon, sulfur, SiO2 and Ash. The crystallizing quality of graphite is determined by the greater content of carbon, and better the lubricity and resistance to oxidation. Synthetic 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 conventional automotive oils can not withstand the high temps, graphite can function as lubricants in automotive engines which reach temperatures 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 reduce friction. It also penetrates effectively into parts where oil can not reach, keeps oil from thickening, enhances compression and helps energy consumption and fuel economy.
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