Diamantschicht mit optimierten Oberflaecheneigenschaften

Die vorliegende Erfindung betrifft eine Diamantschicht, insbesondere eine Diamantschicht zur Verbesserung von tribologischen Eigenschaften von damit beschichteten Werkzeugen oder Bauteilen, wobei die Diamantschicht eine (100)-Textur und eine definiert einstellbare Oberflaechenrauhigkeit mit in etwa gleichfoermigen Vertiefungen aufweist, und die Vertiefungen insbesondere dazu geeignet sind, zusaetzliche Materialien zur Optimierung der Schichteigenschaften aufzunehmen, sowie ein Verfahren zur Herstellung der Diamantschicht und Werkzeuge und Bauteile, die mit dieser Diamantschicht und ggf. zusaetzlichen Materialien beschichtet sind.

DE 19850346 A UPAB: 20000706 NOVELTY - A (100) textured diamond layer has a specific adjustable surface roughness. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (i) production of the above diamond layer by two-stage vapor phase growth of (100) oriented diamond crystals on a substrate, the preferred direction of crystal growth being perpendicular to the substrate surface in the first stage and being horizontal in the second stage; and (ii) a tool or component coated with the above diamond layer. Preferred Features: The layer has A1 recesses occupying 30-90% of its total surface. The surface recesses are (partially) filled with one or more different materials selected from solid or liquid lubricants, a sulfide, Teflon (RTM), soft metals, layers of DLC (diamond-like carbon) and its modifications and silicone. The layer is deposited by hot filament CVD using a first stage reaction gas mixture containing added nitrogen and/or having a higher carbon compound concentration than that in the second stage and/or using higher filament and substrate temperatures in the second stage. USE - As a coating for a tool, such as a machining tool (e.g. a throwaway cutter tip, miller or drill bit), pressing tool (e.g. ceramic, hard metal or tablet pressing tool) or shaping tool (e.g. a deep drawing tool), or a component such as a bearing, piston/cylinder unit (e.g. chemical pump) or guide element (e.g. linear guide or thread guide). ADVANTAGE - The controlled surface roughness of the diamond layer can be (partially) filled with one or more other materials to provide various properties, e.g. non-stick, lubricating and non-fouling properties, in addition to wear and friction resistance.