Spheroidal graphite
Spheroidal graphite is a geometric form of graphite . It is used in various commercial applications.
Spheroidal graphite as an admixture of colloids
Spheroidal graphite is used with grain sizes of 1 to 10 µm z. B. used in lubricating oils to reduce the coefficient of friction. Due to the layered crystal structure of the graphite, the particles can slide off, which leads to a lubricating effect.
The addition creates a colloidal preparation. The fine spheroidal graphite particles float in the emulsion and are prevented from settling by the Brownian movement . MoS 2 ( molybdenum disulfide ) and PTFE ( Teflon ) are also used with the same aim .
Nodular graphite in cast iron
In " spheroidal graphite cast iron ", spheroidal graphite is a precipitate of carbon in the iron matrix. This gives the material a very good ductility , which is significantly higher than that of cast iron with lamellar graphite.
They are used in irons that are subject to pulsating and dynamic loads. These cast iron materials are available in different strength classes.
Individual evidence
- ^ Colloidal graphite in oil . CP-Handels-GmbH. January 6, 2011. Archived from the original on May 1, 2014. Retrieved December 11, 2013.