The possibility of improving the performances of current aluminiumalloys in the bearings region of lightweight external gear pumps has beeninvestigated. Two different electroless Ni-based coatings, one containing highpercentages of P (10–14%) and the other modified with the addition of 25 wt%PTFE micrometric spheres, deposited on 2011 Al alloy, were characterisedby scratch test and ball-on-disc tests. Comparison with an antifrictionSn-containing Al-alloy was performed. The PTFE-containing coating presentsthe lowest wear rate and friction against steel. However, the presence of PTFEspheres and the hardness mismatch with the substrate tends to favour tensilecracking of the coating.
Electroless Ni coatings for the improvement of wear resistance of bearings for lightweight rotary gear pumps / Veronesi, Paolo; Sola, Ramona; Poli, Giorgio. - In: INTERNATIONAL JOURNAL OF SURFACE SCIENCE AND ENGINEERING. - ISSN 1749-7868. - STAMPA. - 2:3-4(2008), pp. 190-201. [10.1504/IJSURFSE.2008.020493]
Electroless Ni coatings for the improvement of wear resistance of bearings for lightweight rotary gear pumps
VERONESI, Paolo;SOLA, Ramona;POLI, Giorgio
2008
Abstract
The possibility of improving the performances of current aluminiumalloys in the bearings region of lightweight external gear pumps has beeninvestigated. Two different electroless Ni-based coatings, one containing highpercentages of P (10–14%) and the other modified with the addition of 25 wt%PTFE micrometric spheres, deposited on 2011 Al alloy, were characterisedby scratch test and ball-on-disc tests. Comparison with an antifrictionSn-containing Al-alloy was performed. The PTFE-containing coating presentsthe lowest wear rate and friction against steel. However, the presence of PTFEspheres and the hardness mismatch with the substrate tends to favour tensilecracking of the coating.
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