The MKP 200 coating, a metal-ceramic composite coating, is applied using a plasma spraying process and is successfully used in a variety of applications.

• Compression rings
• Technological properties: Very high scuff resistance and high wear resistance
• Coating material: Sprayed powder material composed of metal matrix chrome carbide and molybdenum
• Coating application process: Plasma spraying
• Chemical composition of the coating (%): Mo: 52-68, C: 0.5-2.0, Cr: 12-22, Ni: 12-20
• Hardness of coating: Average 300-1100 HV 0.1

In order to improve the wear resistance and tribological properties of the rings, different coatings have been used on running surfaces for many years. Galvanic coatings, thermal coatings and PVD coatings are used.  Spray coatings on piston rings in the top groove are preferred to hard chromium plated rings above all when engines - chiefly diesel engines - are subject to increased risk of scuffing. Materials deposited by a spray process can better withstand this adhesive wear caused by direct metal-to-metal frictional contact, as in some cases they have a very high ceramic content.  Metal-ceramic composite coatings today predominate in most applications as armouring for the running face of piston rings in diesel engines, while molybdenum coatings are now only used occasionally because of their comparatively low wear resistance.