Increased Surface Fatigue Lives of Spur Gears by Application of a Coating

Abstract

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 fifteen tests resulted in fatigue failure before completing 275 million revolutions. For coated gears, eleven of the fourteen tests were suspended with no fatigue failure after 275 million revolutions. The improved life owing to the coating, approximately a six-fold increase, was a statistically significant result.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 2003
Accession Number
ADA417930

Entities

People

  • Bruce D. Hansen
  • Clark V. Cooper
  • Dennis P. Townsend
  • Timothy L. Krantz

Organizations

  • National Aeronautics and Space Administration

Tags

Communities of Interest

  • Air Platforms
  • Space

DTIC Thesaurus Topics

  • Aircrafts
  • Coatings
  • Computer Programs
  • Diameters
  • Engineering
  • Fatigue Life
  • Fatigue Tests (Mechanics)
  • Geometry
  • Life Tests
  • Low Resolution
  • Mass Spectrometry
  • Materials
  • Space Sciences
  • Standards
  • Statistical Analysis
  • Test Methods
  • Thickness

Fields of Study

  • Materials science

Readers

  • Mathematics or Statistics
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).