Coating arrangement

A coupling comprising:

• two shaft elements of a deep-sea wind power plant system, each of the two shaft elements defining a connecting end comprising a flanged-shaped widened shaft end, each flange-shaped widened shaft end having a planar flange surface, the planar flange surface having a Mohs hardness,
• a perforated disk-shaped component having at least a front side and a side opposite to the front side, wherein the front side and the side opposite to the front side are formed having planar surfaces which are parallel with one another, the perforated disk shaped component being inserted between the respective planar flange surfaces of the flange shaped widened shaft ends of the two shaft elements,
• the front side planar surface having a plurality of depressions formed therein and the planar surface of side opposite the front side having a plurality of depressions formed therein, the front side planar surface, the planar surface opposite the front side planar surface and the plurality of depressions collectively defining a coating carrier,
• a coating arrangement applied to the coating carrier, the coating arrangement comprising:
• a plurality of particles each particle having a Mohs hardness of at least 9 and a predetermined mean grain size, and
• a coating applied to the coating carrier, so as to enclose the particles and having a thickness of about half of the particle mean grain size, wherein:
• the coating includes a lower coating applied to the surface of the coating carrier, the particles being disposed on the lower coating, and an upper coating applied to an exposed surface of the lower coating, and
• at least 85% of the depressions being formed such that each depression of the at least 85% of the depressions is surrounded by a surface environment and has at least one of a depth of less than about 10% of the coating thickness and an opening width of up to about 15% of the coating thickness in relation to a surface environment,
• wherein the flanged-shaped widened shaft ends are implemented from a material which has lesser values than the coating carrier both in regard to Mohs hardness and also tensile strength,
• wherein the perforated-disk-shaped component is assembled between the flanged-shaped widened shaft ends of the two shaft elements,
• wherein the coupling is arranged to transfer a torsional load from a first shaft element of the two shaft elements to a second shaft element of the two shaft elements using solely a combination of (a) friction between each planar flange surface of the respective shaft element and the planar surfaces of the respective mating side of the perforated disk-shaped component and (b) mechanical engagement of a fastener passing through each respective aligned series of perforations extending through the two shaft elements and the perforated disk-shaped component,
• wherein the friction includes a force provided by pressing the plurality of particles carried by the side of the perforated disk-shaped component into the respective flanged-shaped widened shaft end.