About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
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| Symposium
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Advancing the Frontier of Powder Materials Processing and Sintering: A MPMD/EPD Symposium in Honor of Eugene Olevsky
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| Presentation Title |
Modeling of Sintering of Additively Manufactured Hydroxyapatite Bioceramic Scaffolds |
| Author(s) |
Maryam Ghorbani, Elisa Torresani, Eugene Olevsky |
| On-Site Speaker (Planned) |
Maryam Ghorbani |
| Abstract Scope |
Hydroxyapatite bioceramics are used in load-bearing bone and dental implants due to their chemical similarity and porosity compatibility with natural bone, supporting biodegradation and tissue integration. In this study, lattice-structured HAP scaffolds are fabricated via extrusion-based robocasting and thermally processed to investigate the densification mechanisms governing their mechanical behavior and dimensional evolution.
Linear shrinkage is monitored using optical and push-rod dilatometry over a temperature range of 900–1400 °C. Phase transformations and microstructural changes are characterized by X-ray diffraction and scanning electron microscopy. Densification kinetics are modeled using the Olevsky Continuum Theory of Sintering, allowing extraction of key parameters such as effective sintering stress, temperature-dependent viscosity, and activation energy.
The results reveal that grain-boundary diffusion dominates during the initial and intermediate stages of sintering, while surface diffusion becomes rate-limiting above 1200 °C. These parameters provide input for finite element simulations aimed at minimizing distortion and tailoring porosity in patient-specific bioceramic implants. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Ceramics, Modeling and Simulation |