Tribological Behavior of Bronze Composite Coatings Obtained by Plasma Thermal Spraying |
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Authors: | J M Miguel S Vizcaino C Lorenzana N Cinca J M Guilemany |
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Affiliation: | (1) Thermal Spray Centre (CPT), University of Barcelona (UB), Barcelona, Spain |
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Abstract: | Bronze aluminum composite coatings containing different amounts of alumina were fabricated by plasma spray process and their
tribological properties were investigated using ball-on-disk (BOD) and rubber wheel (RW) tests at room temperature. Main wear
mechanisms in pure bronze coatings during the ball-on-disk friction test were abrasion and intersplat delamination. The addition
of alumina in bronze coatings clearly enhances their wear resistance. To explain this behavior, this article proposes an additional
wear mechanism in the composite coatings that involves the rupture of the alumina lamellae located just below the wear track
leading to a uniform distribution of fine alumina particles enveloped by the bronze matrix, which increase the surface hardness
and hinder the wear. The deposition of debris on the wear track of composite coatings provokes an enhancement of the wear
resistance as well. Bronze coatings show a low and stable friction coefficient of around μ = 0.3. Nevertheless, coatings with
reinforcing particles of alumina show an abrupt transition in the friction coefficient from values around μ = 0.4–0.8, related
to the modification of the surface contacts on the wear track due to the formation of a compacted debris layer deposited during
the tribological test. |
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