DLC – Diamond-Like Carbon Coatings
Depending on the inner structure, i.e. the configuration and correlation of the C-atoms, pure carbon exists just in two extremes in nature. On the on hand as an extremely hard and indestructible diamond, a pure sp3-chemical bond, and on the other hand as a (sp2-chemical bond) soft graphite even with a lubricating properties. DLC combines both of these characteristics of diamonds and graphite in one material and shows high hardness and at the same time a very low coefficient of friction rate. The hardness varies or even exceeds a range of 15-35 GPa. At the same time, the coefficient of friction can be as low as ≤ 0.15.
Because of these properties DLC-coatings work very well for surface finishing. Friction and wear of coated tools for machining of non-iron containing materials are reduced. The DLC-coating also reduces sliding friction significantly in roller bearings and sliding parts. Additionally there is the bio-compatibility of this material. This makes DLC suitable for medical purposes as in the coating of prostheses, surgical instruments and in the coating of components used in the food industry. Additionally due to the non-conductivity it can be used for electronic components.
We offer the following DLC-coatings custom designed for your applications:
|Coefficient of friction
|ta-C||≤ 35||0.15||< 500||black|
|a-C:H||15||0.05 – 0.1||350||black|
|M-DLC||20||0.1 – 0.15||400||black|
(*) Microhardness, deviations +/- 3 GPa
Applications of the respective DLC-coatings
Maximum hardness of the DLC-coating due to the very high content of sp3. Minimal wear due to a low coefficient of friction in combination with a high temperature stability. Applicable e.g. on cutting tools to be used for machining soft metals or plastics.
Hydrogen-containing DLC-coating to achieve the lowest coefficient of friction. For example applicable in roller bearings.
Various metal doped DLC-coatings for custom designed requirements with high pressure- and surface stress for example on cutting tools or dies.