Study proves slip-rolling resistance
Thursday, 9 September 2010
A new study deals with the slip-rolling resistance of novel crystalline thin film coatings under high Hertzian contact pressures.
Novel thin film coatings can be slip-rolling resistant Source: Henrik-G. Vogel/Pixelio.de
A new study deals with the slip-rolling resistance of novel Zr(C,N) thin film coatings under high Hertzian contact pressures. Experiments showed that crystalline Zr(C,N) coatings can be slip-rolling resistant at 120 °C in factory fill engine oil up to ten million cycles under average Hertzian contact pressures up to P0mean = 1.94 GPa (P0max = 2.91 GPa). Basically, this represents the doubling of the normal force acting on the surface compared to uncoated steel traditionally lubricated with fully formulated oil. Typically, the coated substrates are made of the quenched and tempered bearing steel Cronidur 30. The Zr(C,N) coatings were fully characterised using different characterisation techniques in order to understand the difference in lip-rolling resistance under those high tribological demands. The study has been performed at the Bundesanstalt für Materialforschung und -prüfung (BAM).
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