Mechanical seal arrangement with minimal leakage

Mechanical seal arrangement, comprising:

• a mechanical seal with a rotating slide ring and a stationary slide ring,
• wherein one of the two slide rings has a first sliding surface,
• wherein the other of the two slide rings has a second sliding surface with a circumferentially closed sealing edge, which projects from in a direction towards the first sliding surface by a height (H),
• wherein the sealing edge has a width which is in an area between 10 to 500 μm,
• wherein at least one pre-stressing element pre-stresses the slide rings against each other,
• wherein the second sliding surface and the sealing edge at the second sliding surface have a diamond coating, or wherein the second sliding surface and the sealing edge at the second sliding surface have a cubic boron nitride coating, wherein a width of the sealing edge is smaller than a width of the first sliding surface, and contacts only a portion of the first sliding surface, and
• wherein between the first sliding surface and the second sliding surface a OH ion donor and/or a H+ ion donor is present.