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Title: Antiwear and EP characteristics of some rare earth fluorides as grease additives

Abstract

Lithium grease containing some rare earth fluorides such as LaF{sub 3}, CeF{sub 3}, PrF{sub 3}, NdF{sub 3}, GdF{sub 3} and a mixture of rare earth fluorides was prepared by means of mechanical mixing and milling. The extreme-pressure (EP) and antiwear (AW) properties of these greases were evaluated using a four-ball lubricant tester. The rubbed surface was analyzed using an electron probe microanalyzer (EPMA). The results show that NdF{sub 3} possesses good antiwear and EP properties. EPMA analysis indicates that a large amount of Nd and a small amount of F and O exists in the surface film. ESCA analysis shows neodymium or cerium fluoride decomposed under sliding and shearing to form neodymium or cerium oxyfluoride on the rubbing surface. 3 refs., 5 figs., 2 tabs.

Authors:
;  [1]
  1. Lanzhou Institute of Chemical Physics (China)
Publication Date:
OSTI Identifier:
393912
Resource Type:
Journal Article
Journal Name:
Lubrication Engineering
Additional Journal Information:
Journal Volume: 50; Journal Issue: 3; Other Information: PBD: Mar 1994
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 36 MATERIALS SCIENCE; GREASES; WEAR RESISTANCE; FRICTION FACTOR; CERIUM FLUORIDES; DECOMPOSITION; NEODYMIUM FLUORIDES; METALS; WEAR; SOLID LUBRICANTS; ADDITIVES; LANTHANUM FLUORIDES; GADOLINIUM FLUORIDES; PRASEODYMIUM FLUORIDES; SLIDING FRICTION; OXYGEN COMPOUNDS

Citation Formats

Yafeng Lian, and Qunji Xue. Antiwear and EP characteristics of some rare earth fluorides as grease additives. United States: N. p., 1994. Web.
Yafeng Lian, & Qunji Xue. Antiwear and EP characteristics of some rare earth fluorides as grease additives. United States.
Yafeng Lian, and Qunji Xue. Tue . "Antiwear and EP characteristics of some rare earth fluorides as grease additives". United States.
@article{osti_393912,
title = {Antiwear and EP characteristics of some rare earth fluorides as grease additives},
author = {Yafeng Lian and Qunji Xue},
abstractNote = {Lithium grease containing some rare earth fluorides such as LaF{sub 3}, CeF{sub 3}, PrF{sub 3}, NdF{sub 3}, GdF{sub 3} and a mixture of rare earth fluorides was prepared by means of mechanical mixing and milling. The extreme-pressure (EP) and antiwear (AW) properties of these greases were evaluated using a four-ball lubricant tester. The rubbed surface was analyzed using an electron probe microanalyzer (EPMA). The results show that NdF{sub 3} possesses good antiwear and EP properties. EPMA analysis indicates that a large amount of Nd and a small amount of F and O exists in the surface film. ESCA analysis shows neodymium or cerium fluoride decomposed under sliding and shearing to form neodymium or cerium oxyfluoride on the rubbing surface. 3 refs., 5 figs., 2 tabs.},
doi = {},
journal = {Lubrication Engineering},
number = 3,
volume = 50,
place = {United States},
year = {1994},
month = {3}
}