Next Article in Journal
Previous Article in Journal
Int. J. Mol. Sci. 2005, 6(6), 203-218; doi:10.3390/i6060203
Article

Relation of Certain Quantum Chemical Parameters to Lubrication Behavior of Solid Oxides

1, 2,*  and 3
Received: 1 April 2005; Accepted: 18 May 2005 / Published: 24 August 2005
Download PDF [171 KB, uploaded 19 June 2014]
Abstract: It is well-documented that certain oxides (such as Re2O7, B2O3, MoO3, V2O5, etc.) can provide friction coefficients of 0.1-0.3 to sliding surfaces at elevated temperatures and thus they are often referred to as lubricious oxides in the tribology literature. In a recently proposed crystal chemical model, Erdemir was able to establish a close correlation between the reported friction coefficients of such oxides and their ionic potentials [1]. In the present paper, we expand on this original concept and explore the relevance of two other quantum chemical parameters, electronegativity and chemical hardness, to the lubricity of solid oxides. These parameters have already been used by scientists to explain the nature of tribochemical interactions between various oil additives and sliding surfaces. It is conceivable that electronegativity and chemical hardness may also be strongly related to the extent of adhesive interactions and shear rheology of solid oxides and hence to their lubricity. The new results have confirmed that electronegativity, like ionic potential, is indeed a valid quantum chemistry parameter that can be used in predicting the lubrication behavior of solid oxides. Generally, the higher the electronegativity of the solid oxides is, the lower the friction coefficients will be. However, chemical hardness did not yield a similar trend. In light of these new findings, we propose some guidelines for the formulation of novel oxide or alloy systems that can lead to the formation of lubricious oxides at elevated temperatures. The findings of this study may pave the way for designer-based tribosystems in general and smart tribochemical systems in particular in future tribological applications such as dry machining.
Keywords: Lubricious oxides; solid lubrication; electronegativity; chemical hardness; quantum chemistry; tribochemistry Lubricious oxides; solid lubrication; electronegativity; chemical hardness; quantum chemistry; tribochemistry
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Export to BibTeX |
EndNote


MDPI and ACS Style

Erdemir, A.; Li, S.; Jin, Y. Relation of Certain Quantum Chemical Parameters to Lubrication Behavior of Solid Oxides. Int. J. Mol. Sci. 2005, 6, 203-218.

AMA Style

Erdemir A, Li S, Jin Y. Relation of Certain Quantum Chemical Parameters to Lubrication Behavior of Solid Oxides. International Journal of Molecular Sciences. 2005; 6(6):203-218.

Chicago/Turabian Style

Erdemir, Ali; Li, Shenghua; Jin, Yuansheng. 2005. "Relation of Certain Quantum Chemical Parameters to Lubrication Behavior of Solid Oxides." Int. J. Mol. Sci. 6, no. 6: 203-218.



Int. J. Mol. Sci. EISSN 1422-0067 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert