Evaluation Of The Friction Properties Of
Thermally Sprayed Coatings
Author(s)
M. Kašparová, F. Zahálka & Š. Houdková
Abstract
In this paper, one of the tribological tests for the evaluation of friction properties
is introduced. The test, named \“Block-on-Ring”, (in accordance with the
standard ASTM G77) was carried out by the ŠKODA VÝZKUM Ltd. company
and realized on renovated apparatus. The brief description of the measurement is
as follows: the flat surface of the sample is pressed against the cylindrical surface
of the rotating wheel. Arbitrary oil is fed to the materials’ contact surface and the
increasing temperature can be detected using the thermocouple that is placed in
close proximity of the contact materials. Using the strain-gauge dynamometer,
the friction force is recorded. The test is run on a number of periods and,
including after the first expiration time, the wear track formed in the sample is
measured and evaluated. The final results are the summary of partial results of
the long-standing tests, which serve for the preliminary detection of the friction
behaviour of the materials. The friction properties of the thermally sprayed
coatings were investigated. The Cr3C2-NiCr, 13% Cr and Cr2O3 coatings were
tested. The thin-base babbit was selected as the counter-part. The main interest
was in the characterization of the friction properties in the dependence on the
amount of added lubricant and on the normal load of sliding couples.
Keywords: friction, block-on-ring, thermally sprayed coatings.
1 Introduction
Friction properties rank among many important material properties which
characterize the tribological behaviour of materials that are in a sliding contact.
Because of the sliding between two or more machine parts friction arises.
Friction is the resistance to motion during sliding or rolling that occurs when one
Keywords
friction, block-on-ring, thermally sprayed coatings
Related Book
Other papers in this volume
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