Tribological performance of environmental friendly ionic liquids for high-temperature applications

JOURNAL OF CLEANER PRODUCTION

卷:279

Article

Reeves, Carlton J.¹  Kasar, Ashish K.¹  Menezes, Pradeep L.¹ 

[1] Univ Nevada Reno, Dept Mech Engn, Reno, NV 89557 USA

关键词: Biolubricant;    Ionic liquids;    Phosphonium;    Imidazolium;    Friction;    Wear;   

DOI  :  10.1016/j.jclepro.2020.123666

来源: Elsevier

【 摘 要 】

High-temperature liquid lubricants are often composed of petroleum-based oils. Recently, the lubrication industry has begun to shift towards environmentally benign lubricants to reduce the use of toxic petroleum-based oils. As a result, there has been a resurgence in the use of bio-based lubricants. These biolubricants consist of vegetable oils, synthetic ethers, and polyalkyleneglycols (PAGs) for use as hightemperature lubricants. The largest drawbacks to biolubricants are neither their toxicity nor their lubricity, but rather their thermal instability. Room-temperature ionic liquids (RTIL) are emerging biolubricants that has the potential to replace conventional lubricants at high temperatures. In this investigation 1,3-diakylimidazolium and trihexyl(tetradecyl)phosphonium cations are combined with carboxylate anions to create eco-friendly lubricants for high-temperature applications. Here, these RTILs are compared with bio-based and petroleum-based oils to evaluate their tribological properties through pin-on-disk testing and thermal stability via thermogravimetric analysis (TGA). Additionally, the influence of differing alkyl chain imidazolium cations of the 1-decyl through 1-allyl equivalents and various shape and sized anions are studied. Results indicate that the eco-friendly RTILs exhibit the lowest friction and wear properties as well as superior thermal stability because of their lamellar-like liquid crystal structure, electrostatic potential dipolar, and molecular adsorption layer. (C) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

Free