Electrical contact resistance and tribological behaviors of self-lubricated dielectric coating under different conditions

Electrical contact resistance and tribological behaviors of self-lubricated dielectric coating under different conditions

In this study, the electro-tribological performance of hydrogenated amorphous carbon coatings against bearing steel in different experimental conditions was continuously monitored by means of coefficient of friction (CoF) and electrical contact resistance (ECR). The influence of tribosystem variable...

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Bibliographic Details
Published in:Tribology international Vol. 143; p. 106086
Main Authors: Echeverrigaray, F.G., de Mello, S.R.S., Leidens, L.M., Boeira, C.D., Michels, A.F., Braceras, I., Figueroa, C.A.
Format: Journal Article
Language:English
Published: Kidlington Elsevier Ltd 01-03-2020
Elsevier BV
Subjects:
Bearing steels
Coefficient of friction
Contact resistance
Dielectric properties
Dissipated energy
Electric contacts
Electrical contact resistance
Electrical resistance
Electro-tribology
Friction resistance
Lubrication
Mathematical analysis
Microslip
Self lubrication
Tool wear
Tribology
Wear sensing
AISI
HMDSO
Electrical contact resistance
HV
SHC
Dissipated energy
ECR
ASTM
EDS
RH
Electro-tribology
SEM
COF
PECVD
Wear sensing
OM
DC
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Summary:In this study, the electro-tribological performance of hydrogenated amorphous carbon coatings against bearing steel in different experimental conditions was continuously monitored by means of coefficient of friction (CoF) and electrical contact resistance (ECR). The influence of tribosystem variables such as humidity, velocity and lifetime on frictional and electrical response were also compared with specific wear energy calculation method. The main findings of both tribological and electrical behaviors include the dissipated energy and the micro-slip dielectric failures that can be linked to the properties of self-lubricating layers, which depend also on the working media. In this framework, the electro-tribological evaluation provides an electrical monitoring tool for coating premature wear detection in real time. •Local recognition of micro-slip dielectric failures in real time using ECR displacement traces.•Energy transfer can gradually cause transitions on film surfaces and frictional oscillations.•High speed under 80% RH results in CoF increase, water molecule cover-break and dielectric character preservation.•Lowest specific wear energy among surface tribopairs in high speed compared to low speed at dry conditions.•Surface integrity response linked to the effects of eletrotribological system inputs, outputs and losses.
ISSN:0301-679X
1879-2464
DOI:10.1016/j.triboint.2019.106086