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Binder droplet impact mechanism on a hydroxyapatite microsphere surface in 3D printing of bone scaffolds

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Abstract

The combination of hydroxyapatite composite powder and three-dimensional (3D) printing rapid prototyping techniques has markedly improved skeletal interactions in orthopedic surgery applications. 3D printing methodology ensures effective bionic microstructure and shape interactions between an implant and the surrounding normal tissue. In effort to enhance the quality, precision, and mechanical properties of printed bone scaffolds, this study examines binder droplet spreading performance on the surface of hydroxyapatite (HA) microspheres. The piezoelectric nozzle diameter is about 10 μm, which sprays droplets 20 μm in diameter. The average size of HA powder particles is about 60 μm in diameter. Most laboratories, however, are limited to observation of a single droplet 20 μm or smaller in diameter impacting a spherical surface 60 μm in diameter. Based on non-dimensional scale similarity theory in axisymmetric Stokes flow dynamics, this study conducted experiments and simulation on the same collision conditions (droplet 200 μm in diameter, spherical surface 600 μm in diameter). Simulation results were consistent with experiment data, and form a basis for future research on modeling droplet impact on spherical surfaces.

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Acknowledgements

This project is sponsored by the National Natural Science Foundation of China, (Grant Nos. 51175432 and 50905147), the Doctor Special Science and Technological Funding of the China Ministry of Education (Grant No. 20116102110046), the Fundamental Research Funds for the Central Universities (3102014JCS05007), and the graduate starting seed fund of Northwestern Polytechnical University (Grant No. Z2015074).

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Authors and Affiliations

  1. Industry Engineering Department, School of Mechanical Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi’an, 710072, Shaanxi, People’s Republic of China

    Yan-en Wang, Xin-pei Li, Chuan-chuan Li, Ming-ming Yang & Qing-hua Wei

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  1. Yan-en Wang
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  2. Xin-pei Li
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  3. Chuan-chuan Li
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Correspondence to Yan-en Wang.

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Wang, Ye., Li, Xp., Li, Cc. et al. Binder droplet impact mechanism on a hydroxyapatite microsphere surface in 3D printing of bone scaffolds. J Mater Sci 50, 5014–5023 (2015). https://doi.org/10.1007/s10853-015-9050-9

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  • DOI: https://doi.org/10.1007/s10853-015-9050-9

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