Wear resistance enhancement of the titanium alloy Ti–6Al–4V via a novel co-incident microblasting process

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• 作者：David Fleming^a ; ^{David.Fleming@cit.ie"" rel=""nofollow} ; Liam O'Neill^a ; Greg Byrne^b ; Nicholas Barry^b ; Denis P. Dowling^b
• 关键词：CoBlast™ ; Ti&#x2013 ; 6Al&#x2013 ; 4V ; Wear ; Teflon ; Silicon carbide ; Boron carbide
• 刊名：Surface and Coatings Technology
• 出版年：2011
• 出版时间：25 August 2011
• 年：2011
• 卷：205
• 期：21-22
• 页码：4941-4947
• 全文大小：1281 K

文摘

In this study a room temperature coating deposition technology was investigated as a means of enhancing wear resistance of the titanium alloy Ti–6Al–4V. This process, termed CoBlast™, consists of co-incident particle streams of abrasive and coating materials which impact a substrate to create a modified surface. Al₂O₃ powder was chosen as the abrasive, while Teflon, SiC and B₄C powders were investigated as coating precursors.

Ti–6Al–4V surfaces modified via CoBlast using either Al₂O₃–SiC or Al₂O₃–B₄C powder mixtures both demonstrated increased hardness compared with the unmodified alloy, however, wear testing performed using a pin-on-disc tribometer revealed that this did not translate to an appreciable improvement in wear resistance performance. In contrast, under the same wear test conditions, Al₂O₃–Teflon CoBlast modified Ti–6Al–4V demonstrated a significantly reduced friction coefficient and average pin-on-disc wear track widths and depths of 68 and 90 % less than those which formed on the unmodified alloy. Through the deposition of either SiC or B₄C coatings in combination with a Teflon top layer a further improvement in wear resistance was confirmed by a 81/97 % reduction in wear track width/depth.

In conclusion, the deposition of Teflon coatings onto unmodified, SiC modified or B₄C modified Ti–6Al–4V using the CoBlast process yielded surfaces with significantly enhanced wear performance.