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Graphite Characteristics

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Graphite has a low friction coefficient and very high thermal stability (2000°C [3632°F] and above). However, practical application is limited to a range of 500 to 600°C (932 to 1112°F) due to oxidation. Furthermore, because graphite relies on adsorbed moisture or vapors to achieve low friction, use may be further limited. At temperatures as low as 100°C (212°F), the amount of water vapor adsorbed may be significantly reduced to the point that low friction cannot be maintained. In some instances sufficient vapors may be extracted from contaminants in the surrounding environment or may be deliberately introduced to maintain low friction. When necessary, additives composed of inorganic compounds may be added to enable use at temperatures to 550°C ( 1022°F). Another concern is that graphite promotes electrolysis. Graphite has a very noble potential of + 0.25V, which can lead to severe galvanic corrosion of copper alloys and stainless steels in saline waters.

 

 

 

 

 

 

 

 

 

 

 

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