Three-Dimensional Printing of Si₃N₄ Bioceramics by Robocasting
Silicon nitride (Si3N4) implants have been used in spinal fusion surgery since 2008. The ability to fabricate Si3N4 implants with anatomically relevant shapes and controllable architecture can be particularly beneficial in patient-specific applications. In the present study, an aqueous paste composed of Si3N4 powder and sintering additives was prepared with the requisite rheology and formed into structures with different shape and architecture by robocasting. Sintering and hot isostatic pressing (sinter-HIP) produced an almost dense Si3N4 phase (density = 3.23 ± 0.01 g/cm3) with a microstructure composed of fibrous grains. Four-point bending tests of as-fabricated dense beams showed a flexural strength of 552 ± 68 MPa. Together, these results indicate that robocasting combined with sinter-HIP could provide a manufacturing strategy to create Si3N4 implants with controllable shape and architecture for applications in reconstructive surgery.
M. N. Rahaman and W. Xiao, "Three-Dimensional Printing of Si₃N₄ Bioceramics by Robocasting," Ceramic Engineering and Science Proceedings, vol. 38, no. 2, pp. 235 - 246, American Ceramic Society, Feb 2018.
The definitive version is available at https://doi.org/10.1002/9781119474678.ch22
41st International Conference on Advanced Ceramics and Composites, ICACC 2017 (2017: Jan. 22-27, Daytona Beach, FL)
Materials Science and Engineering
Keywords and Phrases
3D Printers; Architecture; Bending Tests; Bioceramics; Hot Isostatic Pressing; Silicon Nitride; Surgery, Different Shapes; Fibrous Grains; Four-Point Bending Test; Manufacturing Strategy; Patient Specific; Reconstructive Surgery; Sintering Additives; Spinal Fusion, Sintering
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International Standard Serial Number (ISSN)
Article - Conference proceedings
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01 Feb 2018