High-grade surface finish

Superfinishing

Depending on the hardness of the carbon material electro-corundum wheels with grain size 120-160 um and hardness P-Z are used.

Honing

Silicon carbide stones of grain size 69-99 um are used. In special cases for hard carbon it is also possible to use diamond coated honing strips depending on the required level of surface finish. Honing is done using the standard honing oils.

Lapping

This process uses lapping powder of aluminium oxide and silicon carbide in grain sizez 1 2-1 6pm.

Polishing

It is essential to achieve a high degree of lapped finish before polishing is carried out. Diamond powder in grain sizes 6-10 pm is used. After machining it is essential to remove the media used (honing oil, lapping and polishing powder) from the work parts.

Ultrasonic dust removal

Where dust-free surfaces are required, ultrasonic dust removal can be carried out. The media used for this are water, distilled water or solvents. Properties of isotropic pyrolytic carbon

• Good hardness: easy to polish, material can have high gloss, good wear resistance

• Mechanical property: reasonable structural material

• Good gas permeability

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