Study on the effect of dynamic chemical polishing treatment on porous titanium alloy scaffolds fabricated using laser powder bed fusion

Jinwang Hu; Jingbo Xue; Lulu Liu; Yami Liu; Minmin Li; Fengtao Wang; Wen Peng

Materials & Design (Jan 2024)

Study on the effect of dynamic chemical polishing treatment on porous titanium alloy scaffolds fabricated using laser powder bed fusion

Jinwang Hu,
Jingbo Xue,
Lulu Liu,
Yami Liu,
Minmin Li,
Fengtao Wang,
Wen Peng

Affiliations

Jinwang Hu: Key Laboratory of Intelligent Manufacturing Technology of Ministry of Education, College of Engineering, Shantou University, Shantou 515063, PR China; Foshan Orthopedic Implant (Stable) Engineering Technology Research Center, Foshan 528000, PR China
Jingbo Xue: Department of Orthopaedic Surgery, The First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang 421001, PR China
Lulu Liu: Department of Orthopaedic Surgery, The First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang 421001, PR China
Yami Liu: Foshan Orthopedic Implant (Stable) Engineering Technology Research Center, Foshan 528000, PR China
Minmin Li: Foshan Orthopedic Implant (Stable) Engineering Technology Research Center, Foshan 528000, PR China
Fengtao Wang: Key Laboratory of Intelligent Manufacturing Technology of Ministry of Education, College of Engineering, Shantou University, Shantou 515063, PR China; Corresponding authors at: Department of Orthopaedic Surgery, The First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang 421001, PR China (W. Peng).
Wen Peng: Department of Orthopaedic Surgery, The First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang 421001, PR China; Foshan Orthopedic Implant (Stable) Engineering Technology Research Center, Foshan 528000, PR China; Institute of Advanced Wear & Corrosion Resistant and Functional Materials, Jinan University, Guangzhou 510632, PR China; Corresponding authors at: Department of Orthopaedic Surgery, The First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang 421001, PR China (W. Peng).

Journal volume & issue: Vol. 237
p. 112580

Abstract

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This study addresses the issue of a significant amount of unmelted powder adhering to the surface of Laser Powder Bed Fusion (LPBF) porous titanium alloy scaffolds, and the current inability of existing technologies to effectively handle such surface defects. Porous titanium alloy scaffolds with a triple periodical minimal surface (TPMS) Gyroid structure were prepared using powder bed fusion technology for dynamic chemical polishing. The spatial and surface morphology, as well as the mechanical properties of the scaffolds, were evaluated before and after treatment. Concurrently, fluid finite element simulation was employed to analyze the flow state of the solution inside the porous scaffold during dynamic chemical polishing. Cell culture samples were prepared and subjected to dynamic chemical polishing to study the specific effects of scaffold surface morphology on cell activity. The results indicate that the surface treatment effect, internal and external homogeneity, and dynamic and static mechanical properties of the porous scaffolds with a Gyroid structure are significantly improved after dynamic chemical polishing. Additionally, it was found that dynamic chemical polishing could effectively reduce the micrometer roughness and increase the nanometer roughness of the sample surface, thereby enhancing the adhesion, proliferation, and differentiation activities of Human Bone Mesenchymal Stem cells.

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

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