Abstract
A phosphonium-phosphinate ionic liquid (IL) was studied as a lubricant additive for rolling-sliding contacts. The bench-scale test was designed to simulate automotive rear axle operation during cold start, highway towing, and overload conditions. Adding such an IL (2%) into a base oil significantly reduced wear loss and rolling contact fatigue, e.g., microcracking and micropitting, but made the vibrational noise notably higher under a low (−1.5%) sliding roll ratio (SRR). Worn surface characterization revealed an interesting texture pattern with alternating smoother plateaus and rougher valleys, which is believed to cause the high vibration. No increased vibration was observed at a high (−30%) SRR, possibly because the more aggressive sliding abrasion prevented such a surface texture from forming.
| Original language | English |
|---|---|
| Article number | 106949 |
| Journal | Tribology International |
| Volume | 159 |
| DOIs | |
| State | Published - Jul 2021 |
Funding
The authors thank M. Viola from General Motors for providing the VHVI8 base oil and D. Coffey from ORNL for preparing STEM samples. Research was jointly sponsored by the Vehicle Technologies Office, Office of Energy Efficiency and Renewable Energy, U.S. Department of Energy (DOE) and Tank Automotive Research, Development and Engineering Center (TARDEC), U.S. Army, U.S. Department of Defense (DoD). Electron microscopy characterization was in part performed based on an accepted grant no. CNMS2019-097 at ORNL's Center for Nanophase Materials Sciences (CNMS), sponsored by the.Scientific User Facilities Division, Office of DOE-BES, Note: This manuscript has been authored by UT-Battelle, LLC under contract no. DEAC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research by the DOE Public Access Plan (http://energy.gov/downloads/doe-publicaccess- plan). Note: This manuscript has been authored by UT-Battelle, LLC under contract no. DEAC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research by the DOE Public Access Plan ( http://energy.gov/downloads/doe-publicaccess- plan). The authors thank M. Viola from General Motors for providing the VHVI8 base oil and D. Coffey from ORNL for preparing STEM samples. Research was jointly sponsored by the Vehicle Technologies Office, Office of Energy Efficiency and Renewable Energy , U.S. Department of Energy (DOE) and Tank Automotive Research, Development and Engineering Center (TARDEC) , U.S. Army, U.S. Department of Defense (DoD) . Electron microscopy characterization was in part performed based on an accepted grant no. CNMS2019-097 at ORNL's Center for Nanophase Materials Sciences (CNMS) , sponsored by the. Scientific User Facilities Division, Office of DOE-BES
| Funders | Funder number |
|---|---|
| DOE Public Access Plan | |
| DOE-BES | DEAC05-00OR22725 |
| United States Government | |
| U.S. Department of Defense | CNMS2019-097 |
| U.S. Department of Energy | |
| Office of Energy Efficiency and Renewable Energy | |
| Oak Ridge National Laboratory | |
| U.S. Army | |
| Tank Automotive Research, Development and Engineering Center | |
| General Motors of Canada |
Keywords
- Ionic liquid
- Lubricant additive
- Micropitting
- Rolling contact fatigue
- Vibration