Effect of Sulfur to Molybdenum Composition Ratio on Friction and Wear Characteristics in Air of Sputtered Molybdenum Disulfide Films

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  • MATSUZAKI Kazunari
    Department of Mechanical and Control Engineering, Graduate School of Engineering, Kyushu Institute of Technology
  • SASAKI Iwao
    Department of Biological Functions and Engineering, Graduate School of Life Science and Systems, Kyushu Institute of Technology
  • SUNAHARA Kenji
    Department of Intelligent Mechanical Engineering, Fukuoka Institute of Technology
  • IKEDA Michiaki
    Ikeda Consulting Engineer Office
  • MATSUDA Kenji
    Department of Mechanical and Control Engineering, Graduate School of Engineering, Kyushu Institute of Technology

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  • 二硫化モリブデンスパッタ膜の大気中における摩擦摩耗特性に及ぼす硫黄対モリブデン組成比の影響
  • ニリュウカ モリブデンスパッタマク ノ タイキ チュウ ニ オケル マサツ マモウ トクセイ ニ オヨボス イオウ タイ モリブデン ソセイヒ ノ エイキョウ

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Abstract

<p>It has been known that molybdenum disulfide exists as a monophase in the S/Mo composition ratio range from about 1.94 to 2.25. In this study, sputtered molybdenum disulfide films having S/Mo ratio from 1.96 to 2.25 have been prepared on surface of JIS SUS440C rollers for cross roller bearings by applying the positive voltages ranging from 0 to 60 V to rollers. Friction coefficient and wear life of molybdenum disulfide films have been investigated by friction test conducted in air atmosphere of 10 % relative humidity. It is found that better lubricating performance which means longer wear life and lower friction coefficient was obtained in the films having S/Mo ratio from 2.06 to 2.15 near the center of the S/Mo composition ratio range of molybdenum disulfide. On the other hand, sudden drop of lubricating performance were appeared near both limit values of the composition ratio range.</p>

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