Browse Publications Technical Papers 2008-01-0793

High Value PVD Top Ring for High Speed Diesel Engines 2008-01-0793

Due to several market demands of higher wear and scuffing resistance, Duplex PVD (Physical Vapor Deposition) CrN top ring has been used in Heavy Duty Diesel (HDD) engines. The ring comprises a nitrided high chromium stainless steel with a PVD ceramic CrN coating. For High Speed Diesel (HSD) vehicles with lower demands, MAHLE has developed an alternative PVD coated ring, which balances the cost and performance ratio. This alternative, named High Value PVD (HV-PVD), consists of applying the best resistant coating for wear and scuffing, PVD, onto a less costly ring material, Ductile Cast Iron.
The HV-PVD top ring has been tested in HSD engines and shown excellent performance. Additional advantages of the HV-PVD are its lower friction coefficient and better tribological compatibility with the cylinder bore materials when compared to the traditional galvanic chrome based coatings. Such features lead to reduced engine friction and lower cylinder wear. Besides the superb product performance, the demands for environment friendly processes are complied by the vacuum technology of PVD process.
This paper presents bench tests evaluation for wear, friction and scuffing resistance. Engine tests for different European passenger car applications are also presented.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:

Tribological Behavior of Plasma Electrolyte Oxidation Coating on Al 319 Aluminum Alloy


View Details


Influence of Micro Surface Structures of Nodular Cast Iron Crankshafts on Plain Bearing Wear


View Details


Dry Sliding Wear Behavior of Al-B4C Particulate Reinforced Composites Produced by Powder Metallurgy Method


View Details