In vitro corrosion and biocompatibility behavior of CoCrMo alloy manufactured by laser powder bed fusion parallel and perpendicular to the build direction

Atapour, Masoud; Sanaei, Saber; Wei, Zheng; Sheikholeslam, Mohammadali; Henderson, Jeffrey D.; Eduok, Ubong; Hosein, Yara K.; Holdsworth, David W.; Hedberg, Yolanda; Ghorbani, Hassan

doi:10.1016/j.electacta.2023.142059

Cited by 12 publications

(18 citation statements)

References 64 publications

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“…This cannot be explained by the phase, since LPBF- XY CoCrMo was the one deviating in terms of phase and grain orientation based on XRD. The density of both grain boundaries and metal carbides has been reported to be higher in the XY than the XZ plane, , which has been used as an explanation for higher XY than XZ corrosion in H 2 O 2 -containing solutions and 1% lactic acid (the opposite of this study, in which XZ showed more corrosion than XY ). Because of the low carbon content and heat treatment in this study, it is unlikely that secondary precipitation (carbides) would be a main factor.…”

Section: Resultsmentioning

confidence: 53%

“…Because of the low carbon content and heat treatment in this study, it is unlikely that secondary precipitation (carbides) would be a main factor. Our recent study 26 in PBS, citric acid, and PBS + citric acid concluded that there was no significant difference in corrosion resistance between abraded LPBF-XY and LPBF-XZ CoCrMo, the same material as used in this study. Also, there was no significant difference in the surface oxide composition or thickness between LPBF-XY and LPBF-XZ, as determined by XPS in this study and for unexposed (just abraded) specimens in a previous study.…”

Section: Metal Release Without Frictionmentioning

confidence: 69%

“…No blocky carbides were visible for any of the specimens, as they were dissolved after the heat treatment. 26 In this study, microhardness values were obtained for all of the samples to investigate the impact of hardness on tribocorrosion aspects. Average microhardness values of 447 ± 7.7, 444 ± 18, and 475 ± 10 HV 0.5 were recorded for LPBF-XY, LPBF-XZ, and wrought CoCrMo samples, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…LPBF CoCrMo fabricated perpendicular ( XY ) and parallel ( XZ ) to the building direction, as shown in Figure a, were described previously . In short, inert gas-atomized, spherical (15–45 μm) CoCrMo powder was used as feed powder (chemical composition in Table ) for the fully dense specimens fabricated by a Renishaw AM400 SLM System with a discontinuous laser (40–50 μs exposure time, 60–70 μm point distance).…”

Section: Methodsmentioning

confidence: 99%

“…26,27 LPBF CoCrMo fabricated in different building orientations (perpendicular and parallel to building direction) may or may not exhibit different corrosion behaviors, depending on the carbon content, heat treatment, and environmental conditions. 26,27 Our previous study suggested that a suitable biomedical manufacturing protocol, including low-carbon CoCrMo feed powder and a suitable heat treatment protocol, can eliminate any differences in building orientations. 26 The manufacturing process and microstructure are hence critical to the corrosion resistance of CoCrMo under simulated physiological conditions.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Proteins and Building Direction on the Corrosion and Tribocorrosion of CoCrMo Fabricated by Laser Powder Bed Fusion

Atapour,

Standish,

Henderson

et al. 2024

ACS Biomater. Sci. Eng.

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Cobalt–chromium–molybdenum (CoCrMo) alloys are common wear-exposed biomedical alloys and are manufactured in multiple ways, increasingly using additive manufacturing processes such as laser powder bed fusion (LPBF). Here, we investigate the effect of proteins and the manufacturing process (wrought vs LPBF) and building orientation (LPBF-XY and XZ) on the corrosion, metal release, tribocorrosion, and surface oxide composition by means of electrochemical, mechanical, microscopic, diffractive, and spectroscopic methods. The study was conducted at pH 7.3 in 5 g/L NaCl and 5 mM 2-(N-morpholino) ethanesulfonic acid (MES) buffer, which was found to be necessary to avoid metal phosphate and metal–protein aggregate precipitation. The effect of 10 g/L bovine serum albumin (BSA) and 2.5 g/L fibrinogen (Fbn) was studied. BSA and Fbn strongly enhanced the release of Co, Cr, and Mo and slightly enhanced the corrosion (still in the passive domain) for all CoCrMo alloys and most for LPBF-XZ, followed by LPBF-XY and the wrought CoCrMo. BSA and Fbn, most pronounced when combined, significantly decreased the coefficient of friction due to lubrication, the wear track width and severity of the wear mechanism, and the tribocorrosion for all alloys, with no clear effect of the manufacturing type. The wear track area was significantly more oxidized than the area outside of the wear track. In the reference solution without proteins, a strong Mo oxidation in the wear track surface oxide was indicative of a pH decrease and cell separation of the anodic and cathodic areas. This effect was absent in the presence of the proteins.

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Section: Resultsmentioning

confidence: 53%

Section: Metal Release Without Frictionmentioning

confidence: 69%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Proteins and Building Direction on the Corrosion and Tribocorrosion of CoCrMo Fabricated by Laser Powder Bed Fusion

Atapour,

Standish,

Henderson

et al. 2024

ACS Biomater. Sci. Eng.

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Application of Additive Manufacturing in the Development of Polymeric Bioresorbable Cardiovascular Stents: A Review

Yasmin,

Vafadar,

Tolouei‐Rad

2024

Adv Materials Technologies

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Polymeric vascular bioresorbable stents (BRSs) have been widely used for the treatment of coronary artery diseases. While additive manufacturing (AM) is changing the landscape of the healthcare sector by enabling the realization of patient‐specific stents with highly complex structures. There are, however, challenges associated with the use of polymeric BRS, particularly in‐stent restenosis (ISR), related to its poor mechanical properties. Therefore, the aim of this review is to provide an overview of recent advancements in the development of polymeric BRSs designed to meet both mechanical and biological requirements. First, biopolymers as well as shape memory polymers (SMPs) that are suitable for BRSs are highlighted and briefly described. Second, different types of designing structures of vascular stents in addition to introducing effective mechanical metamaterials, e.g., negative Poisson ratio (NPR) structures are addressed. Subsequently, AM methods currently being used to fabricate polymeric BRSs, are discussed and compared with conventional fabrication methods. Lastly, future directions for research are proposed in relation to existing challenges to the realization of a new generation of AM BRSs. Overall, this paper serves as a benchmark for future cardiovascular applications, especially in order to obtain clinically viable polymeric vascular stents by selecting suitable polymers, designs, and AM technologies.

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Additive manufacturing of vascular stents

Shi

et al. 2023

Acta Biomaterialia

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In vitro corrosion and biocompatibility behavior of CoCrMo alloy manufactured by laser powder bed fusion parallel and perpendicular to the build direction

Cited by 12 publications

References 64 publications

Influence of Proteins and Building Direction on the Corrosion and Tribocorrosion of CoCrMo Fabricated by Laser Powder Bed Fusion

Influence of Proteins and Building Direction on the Corrosion and Tribocorrosion of CoCrMo Fabricated by Laser Powder Bed Fusion

Application of Additive Manufacturing in the Development of Polymeric Bioresorbable Cardiovascular Stents: A Review

Additive manufacturing of vascular stents

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