Method for coating micromechanical parts with high tribological performances for application in mechanical systems

A method for coating micromechanical components of a micromechanical system, including a watch movement, comprising:

• providing a substrate component to be coated;
• and
• providing said substrate component with a diamond coating, on a surface of said substrate component, of a given final thickness;
• wherein said diamond coating is provided by CVD deposition in a reaction chamber;
• wherein in a first phase of the CVD deposition process only sp3 hybridised carbon is deposited on said substrate over a first thickness;
• wherein during a second phase of CVD deposition process, a controlled change of the carbon content within the reaction chamber is provided, thereby providing a change of the sp2/sp3 carbon bonds in a vicinity of the surface over a second thickness thereby forming an outer layer having a top, exterior surface;
• and
• wherein the change of sp2/sp3 carbon bond is such that there is a gradual increase of sp2 hybridised carbon content towards the top, exterior surface.