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Effect of as-ground surface and the BALINIT (R) C and Nb-S coatings on contact fatigue damage in gears

Lookup NU author(s): Dr Moorthy Vaidhianathasamy, Professor Brian Shaw


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The influence of as-ground surface and the BALINIT (R) C and Nb-S coatings on contact fatigue damage have been investigated using testing of case-carburised S156 steel helical gears. The micro-surface features on the as-ground gear flank tend to initiate micro-pitting. In BALINIT (R) C coated gears, the surface irregularities are removed by polishing effect resulting in small scale initiation of micro-pitting at the interface between polished and unpolished regions. In Nb-S coated gears, the coating tends to penetrate and fill-up the surface micro-valleys and hence showed only scattered micro-pitting. The Nb-S coated gears did not produce any tooth profile loss whilst the BALINIT (R) C coated gears produced profile loss. However, both BALINIT (R) C and Nb-S coated gears show enhanced contact fatigue performance. (C) 2012 Elsevier Ltd. All rights reserved.

Publication metadata

Author(s): Moorthy V, Shaw BA

Publication type: Article

Publication status: Published

Journal: Tribology International

Year: 2012

Volume: 51

Pages: 61-70

Print publication date: 08/03/2012

ISSN (print): 0301-679X

ISSN (electronic): 1879-2464

Publisher: Pergamon


DOI: 10.1016/j.triboint.2012.02.025


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Funder referenceFunder name
IonBond (UK)
Oerlikon Balzers (UK)
active collaboration of Rolls Royce plc (UK)
FP6-515840European Commission (FOREMOST)