Transparent alumina ceramics fabricated by 3D printing and vacuum sintering

Transparent alumina ceramics were fabricated using an extrusion-based 3D printer and post-processing steps including debinding, vacuum sintering, and polishing. Printable slurry recipes and 3D printing parameters were optimized to fabricate quality green bodies of varying shapes and sizes. Two-step...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2021-01, Vol.41 (1), p.781-791
Main Authors: Carloni, David, Zhang, Guangran, Wu, Yiquan
Format: Article
Language:English
Subjects:
3D printing
Additive manufacturing
Alumina
Transparent ceramics
Vacuum sintering
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Summary:Transparent alumina ceramics were fabricated using an extrusion-based 3D printer and post-processing steps including debinding, vacuum sintering, and polishing. Printable slurry recipes and 3D printing parameters were optimized to fabricate quality green bodies of varying shapes and sizes. Two-step vacuum sintering profiles were found to increase density while reducing grain size and thus improving the transparency of the sintered alumina ceramics over single-step sintering profiles. The 3D printed and two-step vacuum sintered alumina ceramics achieved greater than 99 % relative density and total transmittance values of about 70 % at 800 nm and above, which was comparable to that of conventional CIP processed alumina ceramics. This demonstrates the capability of 3D printing to compete with conventional transparent ceramic forming methods along with the additional benefit of freedom of design and production of complex shapes.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2020.07.051