Wear resistance enhancement of the titanium alloy Ti6AI4V via a novel co-incident microblasting process

Title: Wear resistance enhancement of the titanium alloy Ti6AI4V via a novel co-incident microblasting process
Authors: Fleming, David
O'Neill, Liam
Byrne, Greg
Barry, Nicholas
Dowling, Denis P.
Permanent link: http://hdl.handle.net/10197/5258
Date: Aug-2011
Abstract: A study was undertaken to investigate the potential of a novel surface modification process to enhance Ti6Al4V wear resistance. The process consists of co-incident particle streams of abrasive and dopant materials which impact a substrate to create a modified surface. Al2O3 was chosen as the abrasive and Teflon, SiC and B4C were investigated as dopants. Al2O3-SiC and Al2O3-B4C modified Ti6Al4V both exhibited increased surface hardness compared to the unmodified metal alloy. However, pin-on-disc tribometer measurements indicated that such hardening modifications exhibited no appreciable benefits in terms of wear resistance. On the other hand, Al2O3-Teflon modified Ti6Al4V demonstrated significantly reduced coefficients of friction and reduced wear rates under the same test conditions. Investigations suggest that although the Al2O3 abrasive is not incorporated into the coating, its presence is essential in order to achieve a wear resistant surface. Combinations of hard material (SiC or B4C) modifications with a further layer of Teflon resulted in further enhancement of wear resistance as increased surface hardness was allied with similar low coefficients of friction. In conclusion, a number of the surface modifications conducted have a beneficial affect on the wear resistance of Ti6Al4V. The process is also likely applicable to other metal/metal alloys such as CoCr, NiTi and stainless steels. Furthermore, the chemical-free nature and ambient temperature conditions concerned afford this process the potential to act as an attractive alternative to some of the more problematic high temperature approaches currently in use.
Type of material: Journal Article
Publisher: Elsevier
Copyright (published version): 2011 Elsevier
Keywords: CoBlast™;Ti6Al4V;Wear;Coefficient of friction;Teflon;Silicon carbide;Boron carbide
DOI: 10.1016/j.surfcoat.2011.04.076
Language: en
Status of Item: Peer reviewed
Appears in Collections:Mechanical & Materials Engineering Research Collection

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