Study of MoS2-Ti Composite Coatings Applied in Precision Ball Bearings

Hui Zhou; Jun Zheng; Ji Xing Hu; Rui Peng Sang; Zhi Hua Wan

doi:10.4028/www.scientific.net/AMR.538-541.281

Paper Titles

Microstructural Characterization and Thermal Barrier Effects of Conventional and Nanostructured ZrO₂-7wt.%Y₂O₃ Thermal Barrier Coatings Deposited by Plasma Spraying
p.260

Analysis of Plastic Strain versus Different Depth between Two Fractal Surfaces under Different Deformation Characteristics
p.265

The Electrochemical Behavior of Surface Modified Spinel LiMn₂O₄
p.269

The Corrosion and Oxidation Resistance Improvement of DZ4 Ni-Based Superalloy Irradiated by High Intensity Pulsed Ion Beams
p.276

Study of MoS₂-Ti Composite Coatings Applied in Precision Ball Bearings
p.281

Microstructure Analysis of TiC Reinforced Ni-Based Composite Coating by Plasma Cladding
p.286

Development and Application of Repairing and Protection Technologies for Desulfurization Pump
p.290

The Effects of Voltage on Cu-Ce Infiltration Layer of 304 Stainless Steel by Double Glow Plasma Surface Metallurgy
p.298

Microstructure and Hardness of Surface Composite Layer Fabricated by Evaporative Pattern Casting Technology
p.302

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Study of MoS₂-Ti Composite Coatings Applied in Precision Ball Bearings

Abstract:

708C Ball bearings were made of 9Cr18 steel which had precision of class 4, MoS2-Ti composite coatings were deposited on inner and outer races of ball bearings by unbalanced magnetron sputtering system, and bearing cages were made of PTFE-based self-lubricating polymers. Bearing’s tribological torques as a function of storage time in high humidity environment were studied by using LHU-2 thermal & humidity test chamber and Bearing 2000 torque measurement device. Developing bearing vacuum performance test rig to research bearing’s torque as a function of running time, bearings were dismantled after test and using XPS to analyze the surfaces of bearing’s races and balls. The results show that storied in the environment of 30°C, 85% RH, bearing’s running torques increased proportionally as the storage time went on. When run-in the bearings which were storied for 440 days, the start and average running torques of bearings could come back to the level which was the same as the test start, but the fluctuation of bearing’s average running torque increased. Running in one direction at the speed of 650 r/min, in vacuum environment (~10-4Pa) and ambient temperature, tested bearings showed good running performance with low friction torque varied only between 1g·cm~2 g·cm until to the test ended at 1.872×108 revolutions. XPS analysis showed that a stable and sustainable solid lubrication system was established among bearing’s races, balls and cages.