期刊
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
卷 21, 期 -, 页码 3650-3665出版社
ELSEVIER
DOI: 10.1016/j.jmrt.2022.10.160
关键词
Triply periodic minimal surfaces; (TPMS); Selective laser melting (SLM); Continuous gradient structure
资金
- Natural Science Foundation of China [51831011, 52011530181]
- Shanghai Science and Technology Commission [20S31900100]
- Guangxi Science and Technology Program [198]
- Guangxi key R D Project [Guike AB18050008]
In this work, a new bone-like scaffold with a continuous porosity gradient change based on minimal surfaces was designed. The scaffolds were successfully prepared using selective laser melting with a new alloy. The results showed that the scaffolds had low elastic modulus and suitable strength compared to human bone. The type of unit structure had a significant effect on the mechanical properties and permeability of the scaffolds.
In this work, we designed a new bone-like scaffold with a continuous porosity gradient change based on minimal surfaces. Three minimal surface structures (P (Primitive), G (Gyroid), and D (Diamond)) were chosen to design the scaffolds, and the scaffolds were successfully prepared by selective laser melting using a new Ni46.5Ti44.5Nb9 alloy. The re-sults show that the scaffolds have the matched low elastic modulus (1.5-3.4 GPa) and suitable strength (75-321 MPa) compared with human bone. The unit structure type has a considerable effect on mechanical properties and permeability, and the superiority order is P > G > D. The scaffold is more compact with lower porosity on the outside, where can bear more stress during compression, thus improving the mechanical properties of the scaf-folds. The high porosity in the inner facilitates the flow of liquid, thus improving the permeability of the scaffold. This work provides a new method to design porous scaffolds in medical applications.
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