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Special Tribological Applications

As the properties of graphite materials and CFC composites can be configured with precision in many areas, these materials can be used for a variety of application options where frictional wear should be kept as low as possible. This applies to contact with aggressive media, low or high temperatures, components energised with electrical current or extreme loads. In addition to standard tribological applications, numerous other application options exist.

Developers and engineers are increasingly confronted with extremely high requirements regarding friction and sliding systems in tribological applications. One example of this is the emergency track systems on the Transrapid. Weights of several tonnes bear down on components in an emergency in this case, and that at speeds far in excess of 400 km/h. Enormous forces are also acting on the material. A similar situation exists in relation to brake disks made of fibre ceramics in aircraft, racing cars, heavy trucks and sports versions of some cars. Fibre-reinforced ceramics such as CFC or CMC materials exhibit the best prerequisites for such extreme applications. Weight advantage with undamped mass and simultaneously improved friction characteristics, resistance and durability of the material spur on development in these applications.

Carbon engine pistons with a weight advantage of 30 % when compared to aluminium also offer interesting perspectives when it comes to reducing fuel consumption. Graphite materials also provide better temperature and thermoschock resistance and enhanced sliding characteristics. Only the high price involved has stemmed a breakthrough on a broad front to date.

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