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Title: Effects of extreme pressure additive chemistry on rolling element bearing surface durability

Abstract

Lubricant additives have been known to affect rolling element bearing surface durability for many years. Tapered roller bearings were used in fatigue testing of lubricants formulated with gear oil type additive systems. These systems have sulfur- and phosphoruscontaining compounds used for gear protection as well as bearing lubrication. Several variations of a commercially available base additive formulation were tested having modified sulfur components. The variations represent a range of ''active'' extreme pressure (EP) chemistries. The bearing fatigue test results were compared with respect to EP formulation and test conditions. Inner ring near-surface material in selected test bearings was evaluated on two scales: the micrometer scale using optical metallography and the nanometer scale using transmission electron microscopy (TEM). Focused-ion beam (FIB) techniques were used for TEM specimen preparation. Imaging and chemical analysis of the bearing samples revealed near-surface material and tribofilm characteristics. These results are discussed with respect to the relative fatigue lives.

Authors:
 [1];  [1];  [1];  [2];  [2]
  1. Timken Company
  2. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Temperature Materials Lab. (HTML)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
931056
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Tribology International
Additional Journal Information:
Journal Volume: 40; Journal Issue: 10-12; Journal ID: ISSN 0301-679X
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; ROLLER BEARINGS; WEAR RESISTANCE; ADDITIVES; LUBRICANTS; LUBRICATION; MATERIALS TESTING; SURFACE PROPERTIES; TRIBOLOGY; Rolling element bearings; Extreme pressure additives; Transmission electron microscopy (TEM)

Citation Formats

Evans, Ryan D., Nixon, H. P., Darragh, Craig V., Howe, Jane Y, and Coffey, Dorothy W. Effects of extreme pressure additive chemistry on rolling element bearing surface durability. United States: N. p., 2007. Web. doi:10.1016/j.triboint.2007.01.012.
Evans, Ryan D., Nixon, H. P., Darragh, Craig V., Howe, Jane Y, & Coffey, Dorothy W. Effects of extreme pressure additive chemistry on rolling element bearing surface durability. United States. https://doi.org/10.1016/j.triboint.2007.01.012
Evans, Ryan D., Nixon, H. P., Darragh, Craig V., Howe, Jane Y, and Coffey, Dorothy W. 2007. "Effects of extreme pressure additive chemistry on rolling element bearing surface durability". United States. https://doi.org/10.1016/j.triboint.2007.01.012.
@article{osti_931056,
title = {Effects of extreme pressure additive chemistry on rolling element bearing surface durability},
author = {Evans, Ryan D. and Nixon, H. P. and Darragh, Craig V. and Howe, Jane Y and Coffey, Dorothy W},
abstractNote = {Lubricant additives have been known to affect rolling element bearing surface durability for many years. Tapered roller bearings were used in fatigue testing of lubricants formulated with gear oil type additive systems. These systems have sulfur- and phosphoruscontaining compounds used for gear protection as well as bearing lubrication. Several variations of a commercially available base additive formulation were tested having modified sulfur components. The variations represent a range of ''active'' extreme pressure (EP) chemistries. The bearing fatigue test results were compared with respect to EP formulation and test conditions. Inner ring near-surface material in selected test bearings was evaluated on two scales: the micrometer scale using optical metallography and the nanometer scale using transmission electron microscopy (TEM). Focused-ion beam (FIB) techniques were used for TEM specimen preparation. Imaging and chemical analysis of the bearing samples revealed near-surface material and tribofilm characteristics. These results are discussed with respect to the relative fatigue lives.},
doi = {10.1016/j.triboint.2007.01.012},
url = {https://www.osti.gov/biblio/931056}, journal = {Tribology International},
issn = {0301-679X},
number = 10-12,
volume = 40,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}