The effect of topological design on the degradation behavior of additively manufactured porous zinc alloy

The effect of topological design on the degradation behavior of additively manufactured porous zinc alloy

The advent of additively manufactured biodegradable porous metals presents a transformative opportunity to meet the criteria of ideal bone substitutes. Precisely tailoring their degradation behavior constitutes a pivotal aspect of this endeavor. In this study, we investigated the effects of topologi...

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Bibliographic Details
Published in:Npj Materials degradation Vol. 8; no. 1; pp. 42 - 12
Main Authors: Shi, Yixuan, Xu, Wei, Che, Haodong, Zhao, Shangyan, Chang, Weiwei, Li, Xuan, Lu, Yuchen, Xue, Chenran, Zhang, Dawei, Wang, Lu-Ning, Li, Yageng
Format: Journal Article
Language:English
Published: London Nature Publishing Group UK 24-04-2024
Nature Publishing Group
Nature Portfolio
Subjects:
639/166/985
639/301/54/990
Additive manufacturing
Chemistry and Materials Science
Corrosion and Coatings
Degradation
Design
Diffusion rate
Electrochemistry
Materials Science
Porous metals
Powder beds
Scaffolds
Structural design
Structural Materials
Substitute bone
Topology
Tribology
Zinc base alloys
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Summary:The advent of additively manufactured biodegradable porous metals presents a transformative opportunity to meet the criteria of ideal bone substitutes. Precisely tailoring their degradation behavior constitutes a pivotal aspect of this endeavor. In this study, we investigated the effects of topological designs on the degradation profile of laser powder bed fusion (LPBF) Zn scaffolds under dynamic in vitro immersion tests. Specifically, four types of Zn-0.4Mn-0.2Mg scaffolds (beam-based: diamond, face center cubic; surface-based: gyroid, schwarz-P) were designed and fabricated. The degradation mechanism of the scaffolds was comprehensively evaluated using both experimental and simulation methods. The results illuminate the profound impact of structural design on the degradation properties of the Zn alloy scaffolds. The beam-based diamond and face center cubic scaffolds exhibited a degradation rate of 0.08–0.12 mm per year with a relatively uniform degradation mode under dynamic immersion. On the contrary, the surface-based gyroid and Schwarz-P scaffolds demonstrated a notably reduced degradation rate due to lower permeability. This restricted the diffusion of medium ions within the pores, culminating in the accumulation of degradation products and more severe localized degradation. This study underscores the potential of topological design as a compelling strategy for tailoring the degradation profile of additively manufactured biodegradable scaffolds, thereby advancing their suitability as bone substitutes.
ISSN:2397-2106
2397-2106
DOI:10.1038/s41529-024-00451-z