Surface characterizations of laser modified biomedical grade NiTi shape memory alloys

Pequegnat, A.; Michael, A.; Wang, J.; Lian, Keryn; Zhou, Yunhong; Khan, Muhammad

doi:10.1016/j.msec.2015.01.085

Cited by 51 publications

(24 citation statements)

References 46 publications

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“…The poor crystallinity in the sub-surface regions of the as-received and polished samples pointed to the fact that the surface oxide layer was more likely to be amorphous than crystalline. These observations are consistent with the findings by Pequegnat et al [15] that mechanical polishing facilitated the formation of amorphous oxide on the surface. The water contact angle on the as-received surface was only slightly lower than the polished surface, indicating their similar wetting behaviour (i.e.…”

Section: Biofilm Coverage Comparison Between the As-received And Posupporting

confidence: 93%

“…The improvements mainly stem from the following two characteristics related to the laser-formed oxide layer at the outermost surface: (i) increased percentage (at.%) of TiO2 in the oxide layer [23] and (ii) enhanced oxide homogeneity/uniformity as a result of surface homogenisation after LT (i.e. removal of the pre-existing surface inclusions and/or Ni-rich regions in the base material [15]). Moreover, the other beneficial characteristics of the laser-formed oxide layer such as reduction of surface metallic state [22][23][24][25] and oxide thickening [20] contribute to the improvement in corrosion resistance.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…In addition, the laser-treated surfaces were subjected to several thermal cycles as adjacent laser tracks were made during the laser treatment process [15]. Such subsequent thermal cycles can lead to higher crystallinity of oxide.…”

Section: Biofilm Coverage Comparison Between the Untreated (As-receivmentioning

confidence: 99%

“…These attributes of the oxide layer depend on the previous manufacturing history (e.g. mechanical polishing, chemical passivation or etching, and heat-treatment) [13,15] and can be varied by post-process surface treatments (e.g. ion implantation [16,17], thermal oxidation [18,19] and laser treatment (LT) [15,[20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Fibre laser treatment of martensitic NiTi alloys for load-bearing implant applications: Effects of surface chemistry on inhibiting Staphylococcus aureus biofilm formation

Chan

Carson

Smith

2018

Surface and Coatings Technology

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show abstract

Section: Biofilm Coverage Comparison Between the As-received And Posupporting

confidence: 93%

Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Biofilm Coverage Comparison Between the Untreated (As-receivmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fibre laser treatment of martensitic NiTi alloys for load-bearing implant applications: Effects of surface chemistry on inhibiting Staphylococcus aureus biofilm formation

Chan

Carson

Smith

2018

Surface and Coatings Technology

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show abstract

“…Consequently, the total porosity, pore size and size distribution cannot be controlled (Kasperovich et al, 2016). Therefore, post-processes such as mechanical polishing, chemical etching, heat treatment and anodizing are very crucial (Tarafder et al, 2013;Sadie and Subramanian, 2014;Pequegnat et al, 2015;Bhaduri et al, 2017;Shamvedi et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

The Characteristics of Selective 3D Metal Additive Process Using Electrochemical Deposition and Nozzle Fluid Dynamics

Kim¹,

Kang

Kim³

et al. 2020

Front. Mech. Eng.

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In this study, we investigated the characteristics of the three-dimensional (3D) additive printing process of pure copper(Cu) on metal substrates through the localized electroplating with precisely controlled nozzle fluid dynamics. In addition, we analyzed the characteristics of 3D shape formations in relation to the changes in the main electroplating factors, such as electrolyte temperature, applied current, nozzle pressure, and distance between the working electrode and the nozzle. The variations of the surface texture and growth rate owing to these factors were confirmed and optimum condition was investigated. Finally, the successful fabrication of complicated 3D structures, such as micro coils and star-like pattern were demonstrated through the proposed method.

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Brief Overview of Functionally Graded NiTi‐Based Shape Memory Alloys

et al. 2023

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Shape memory alloys (SMAs) are kinds of smart materials that have superior properties such as shape memory effect and superelasticity, which have the most potential applications in various fields, especially in aerospace, naval, automobile and biomedicine industries, etc. Nevertheless, the inherent natures of shape memory alloys are characterized by the smaller transformation temperature intervals and transformation stress intervals, which make the devices have poor control ability. To achieve the accurate controllability for progressive movement, creating functionally graded shape memory alloys has been adopted. Herein, the classification, fabrications, microstructural features, and performances of functionally graded shape memory alloys are reviewed. For comparison, the creation of various gradients in shape memory alloys can widen the transformation temperature intervals and transformation stress intervals to some extent. In addition, the formation of the compositional, microstructural, or geometrical gradient also contributes to the generation of excellent performances such as the four‐way shape memory effect, higher strength, and larger temperature window for the stress‐assisted two‐way shape memory effect, etc. Such superior functions promote a wider application range of shape memory alloys.

show abstract

Surface characterizations of laser modified biomedical grade NiTi shape memory alloys

Cited by 51 publications

References 46 publications

Fibre laser treatment of martensitic NiTi alloys for load-bearing implant applications: Effects of surface chemistry on inhibiting Staphylococcus aureus biofilm formation

Fibre laser treatment of martensitic NiTi alloys for load-bearing implant applications: Effects of surface chemistry on inhibiting Staphylococcus aureus biofilm formation

The Characteristics of Selective 3D Metal Additive Process Using Electrochemical Deposition and Nozzle Fluid Dynamics

Brief Overview of Functionally Graded NiTi‐Based Shape Memory Alloys

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