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Variation and recovery of resistivity of industrial greases — an experimental investigation
Author(s) -
Prashad Har
Publication year - 1998
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.3010110108
Subject(s) - electrical resistivity and conductivity , drop (telecommunication) , materials science , electric field , metallurgy , mechanical engineering , engineering , electrical engineering , physics , quantum mechanics
In the present work, variation in the resistivity of different greases with time in static conditions, under the influence of applied potential drops, is established. The change in resistivity and physico‐chemical characteristics of the greases in electric fields, and recovery of the resistivity within the test period in the absence of applied potential drop, have been found. The properties of the greases are compared, and their correlation with resistivity is analysed. The paper also gives the results of analysis using an SRV tester, IR spectra, chemical analysis and spectrophotometry, of changes that occurred periodically in the greases, normally used in non‐insulated rolling‐element bearings in the presence of a potential drop across the inner and outer races. The paper highlights the behaviour and mechanism of the process of bearing failure under electric fields.