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High Value PVD Top Ring for High Speed Diesel Engines
Technical Paper
2008-01-0793
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
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.
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Citation
Ferrarese, A., Banfield, R., and Tomanik, E., "High Value PVD Top Ring for High Speed Diesel Engines," SAE Technical Paper 2008-01-0793, 2008, https://doi.org/10.4271/2008-01-0793.Also In
References
- Tomanik, E. Nigro, F. “Piston Ring Pack and Cylinder Wear Modelling” SAE 2001-01-0572 Detroit, EUA 2001
- Warkentin, T. Banfield, R. Nocera, E. “New Ring Pack for HDD Engines” SAE 2007-01-2846 Sao Paulo, Brazil 2007
- Tomanik, E. Ferrarese, A. “Low Friction Ring Pack for Gasoline Engines” ASME ICEF2006-1566 Sacramento, USA 2006