Excimer laser treatment of NiTi shape memory alloy biomaterials

Contrasting the beam interaction characteristics of selected lasers with a partially stabilized zirconia bio-ceramic

“…It is important to realise that the validity of (1) rests on the assumption that the plume species resulting from material removal absorb the laser beams in a similar manner to the solid. Also, probable changes in the absorption level of the material as removal progresses are not taken in account by (1). Nonetheless, as the work of 6 Andrew et al [27], Schmidt et al [16] and Lawrence et al [23][24][25] demonstrated, this simple form of the expression is quite adequate as a first approximation.…”

“…Yet despite this, to date only an extremely limited amount of work pertaining to the use of lasers for treating and processing biomaterials has been published. To improve the corrosion characteristics of NiTi shape memory alloys (SMAs) in physiological solutions, Villermaux et al [1] examined the possibility of treating the surface of the SMAs with excimer laser radiation. The study concluded that the corrosion resistance of the material was increased due to homogenisation of the surface as a result of melting, surface hardening and the thickening of the surface oxide layer.…”

Titanium-Nickel Shape Memory Alloys in Medical Applications

“…No agreement exists in results relating to repassivation ability of TiNi [57,64,65]. TiNi alloys exhibit susceptibility to crevice corrosion [57].…”

“…Evidence of inhomogeneous structure resulting in selective leaching of nickel was reported in used and fabricated orthodontic wire [66]. Electrochemical stability of the TiNi can be increased by a variety of surface treatments [65][66][67][68][69][70][71][72][73][74][75], but no long-term exposure data are available. In a recent work, Wever et al immersed Ni-Ti, Ti alloy and stainless steel 316LVM into Hanks' solution and reported better resistance of TiNi to chemical breakdown of passivity compared to stainless steel [63].…”

The Protection Performance of Polypyrrole Coating Doped with Different Counter Anions for the Corrosion of NiTi Alloy

“…Hence, it is important to find ways to mitigate the release of nickel ion and raise the breakdown potential [4,10]. To improve the corrosion resistance of NiTi alloy, chemical passivation [11], thermal treatment [12] and surface modification techniques, such as laser welding *Address correspondence to this author at the School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Hubei Key Laboratory of Materials Chemistry and Service Failure, Wuhan 430074, PR China; Tel: +86-27-87543432; Fax: +86-27-87543632; E-mail: guoxp@mail.hust.edu.cn treatment [13], laser melting surface [14] and ion implantation [15], have been used in these years.…”