Hard coatings have potential for increasing gear surface fatigue lives. Experiments were conducted using gears both with and without a metal-containing, carbon-based coating. The gears were case-carburized AISI 9310 steel spur gears. Some gears were provided with the coating by magnetron sputtering. Lives were evaluated by accelerated life tests. For uncoated gears, all of 15 tests resulted in fatigue failure before completing 275 million revolutions. For coated gears, 11 of the 14 tests were suspended with no fatigue failure after 275 million revolutions. The improved life owing to the coating, approximately a sixfold increase, was a statistically significant result.
Increased Surface Fatigue Lives of Spur Gears by Application of a Coating
Contributed by the Power Transmission and Gearing Committee for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received March 20, 2003; revised February 18, 2004. Associate Editor: A. Kahraman.
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Krantz, T., Cooper, C., Townsend, D., and Hansen, B. (February 14, 2005). "Increased Surface Fatigue Lives of Spur Gears by Application of a Coating ." ASME. J. Mech. Des. November 2004; 126(6): 1047–1054. https://doi.org/10.1115/1.1799651
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