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Ionic liquids as oil additives for lubricating oxygen-diffusion case-hardened titanium

Journal Article · · Tribology International
 [1];  [2];  [3];  [4];  [3];  [3];  [3]
  1. Wuhan Research Institute of Materials Protection, Hubei (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Chinese Academy of Sciences, Gansu (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Wuhan Research Institute of Materials Protection, Hubei (China)
+ Show Author Affiliations

This study attempts to use ionic liquids (ILs) as oil additives to lubricate oxygen-diffusion (OD) case-hardened titanium for improved friction and wear behavior. Four oil-soluble ILs were used as additives in a base oil for boundary lubrication of an OD-treated Ti-6Al-4V surface sliding against a bearing steel ball. The ILs improved the friction behavior to various extents and the two phosphate ILs clearly outperformed the conventional ZDDP. Unlike ZDDP that adversely caused a higher material loss, ILs exhibited excellent wear protection suggesting good material-chemical compatibility. Particularly, the carboxylate IL protected the OD-Ti surface from any measurable wear. As a result, the morphology and chemical composition of the worn surfaces and tribofilms were examined to gain insights of the anti-wear mechanism.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1523744
Alternate ID(s):
OSTI ID: 1513066
Journal Information:
Tribology International, Journal Name: Tribology International Journal Issue: C Vol. 136; ISSN 0301-679X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
Ionic liquid
Lubrication
Oxygen diffusion
Titanium