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Antiwear actions of additives in solid dispersion
Author(s) -
Morizur M. F.,
Teysset O.
Publication year - 1992
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.3010040405
Subject(s) - abrasion (mechanical) , dispersion (optics) , boron , materials science , phase (matter) , suspension (topology) , potassium , chemical engineering , potassium carbonate , calcium carbonate , adsorption , metallurgy , chemistry , composite material , organic chemistry , optics , physics , mathematics , homotopy , pure mathematics , engineering
Abstract In this paper we compare the action mechanisms of different ‘non‐soluble’ additives: a dispersion of potassium triborate and overbased detergents formed by calcium carbonate, or borate aggregates dispersed by a detergent. These additives act by producing a deposit issued from their mineral phase, on the friction surface. With the potassium triborate, a solid film of borate, bound to the metal, is only detected on a negatively‐polarised surface or in conditions of severe wear when friction surfaces have been activated by abrasion. On the contrary, with the overbased detergent, a solid film is always detected on the friction surfaces, even without activation by abrasion. This additive is decomposed in the contact zone by the effect of the elevated pressure. The present study shows that the method of placement in suspension of the inorganic phase by the detergents is important. It offers the advantage of forming deposits only in the friction zone, instantly and independently of the type and state of the friction surface.