Goetze MoThermal Piston Rings for 4-Stroke Large Bore Engines
All-molybdenum spray coatings have low adhesion tendency due to its proneness to form hard (ceramic) oxides during spraying and its high melting temperature. Applications include diesel engines subject to increased risk of scuffing.
Main applications: compression rings
High scuff resistance, low adhesion tendency
Coating material: Molybdenum
Coating application process: Flame spraying
Hardness of coating: Average 900 - 1200 HV 0.1 (permitted variation ±60 HV 0.1)
Strength: minimum 30Nmm²
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. All-molybdenum has a low adhesion tendency due to its proneness to form hard (ceramic) oxides during spraying and its high melting temperature.
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