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A. Kutsch, M. Schwentenwein, C. Hofstetter, J. Stampfl:
"Lithography-based additive manufacturing of alumina";
Talk: EUROMAT 2021, Online; 09-13-2021 - 09-17-2021.

Structural ceramics as silicon nitride, silicon carbide, zirconia, boron carbide, and alumina have favorable properties like high hardness, wear resistance, high strength at elevated temperatures, creep resistance and, corrosion resistance making them applicable as cutting tools, tribologically loaded components, heat exchangers and engine parts [1].
As alumina is bioinert, it is also used as bioceramics [1], whereby it is one of the most studied ones. Having excellent corrosion resistance compared to metallic alloys, alumina is frequently used for total hip prostheses and is considered a promising material for dental implants [2]. One approach to treat patients with the need for prosthesis is using personalized implants. Using additive manufacturing it is possible to fabricate individual and complex geometric parts directly from a CAD model, which is not processable with conventional manufacturing methods.
Within this work, advancements of printing alumina parts using lithography-based ceramic manufacturing (LCM) are shown. Processing of alumina parts by LCM is a two step process. First, green bodies are printed via the energy of light. Second, the green body is treated thermally to gain a dense ceramic object. The feasibility of realizing dense objects by recycling ceramic scrap and supports is presented. Furthermore, objects printed using recycled alumina are compared to parts printed with virgin alumina powder and it was possible to print, debind and sinter defect free alumina bodies with a wall thickness >10 mm (green body) and 10 mm (after sintering) [3].

[1] Carter, C. B., & Norton, M. G. (2013). Ceramic Materials Science and Engineering. (Vol. 766, p.7). New York: springer.
[2] Huang, J., Li, X., & Guo, Z. X. (2020). Biomechanical and biochemical compatibility in innovative biomaterials. In Biocompatibility and Performance of Medical Devices (pp. 23-46). Woodhead Publishing.
[3] Schwentenwein, M. (2017). Provide characterization of sintered ceramic and cermet parts. Retrieved from http://www.tomax-h2020.eu/media/