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ZHANG Feng
SONG Baoyu
QU Jianjun
School of Mechatronics Engineering,
Harbin Institute of Technology,
Harbin 150001, China
LIU Weimin
State Key Laboratory of Solid
Lubrication,
Lanzhou Institute of Chemical
Physics,
Chinese Academy of Sciences,
Lanzhou 730000, China |
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ROLLING CONTACT FATIGUE
BEHAVIOR OF CERAMIC BALLS
LUBRICATED BY LUBRICANTS WITH
EXTREME PRESSURE ADDITIVES*
Abstract:
An experiment is conducted to investigate the effects of lubricant10#, which contains extreme pressure additives T304 and T305, on the rolling contact fatigue (RCF) life of the contact pairs of a Si3N4 ceramic ball and a steel rod. The experimental investigation is carried out using a ball-rod RCF test rig. The results show that the extreme pressure additives increase the anti-contact-fatigue performance of ceramic balls; When the content of the additives varies from 1% to 5%, the increasing gradient of the RCF life curve decreases; And the oil sample with 1% T305 additive corresponds to the maximal gradient of the RCF life curve, with the RCF life being increased by about 10.77 times. The fatigue surface of the ceramic ball is analyzed with scanning electron microscope (SEM) and X-ray electron dispersion analysis (EDAX), and the physical model of extreme pressure additives’ increasing the RCF life of the ceramic ball is proposed. It is found that the extreme pressure additives form a corrosive film and a transfer film on the surface of the ceramic ball, which decrease the surface tangential stress, and to increase the surface energy is the most effective means for increasing the RCF life.
Key words:
Ceramic bearing Si3N4 ceramic Rolling contact fatigue Extreme pressure additive |