Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 41, Issue 1, Pages 781-791Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.07.051
Keywords
Transparent ceramics; 3D printing; Additive manufacturing; Alumina; Vacuum sintering
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Funding
- NSF CAREER grant [1554094]
- Office of Naval Research [N00014-17-1-2548]
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Transparent alumina ceramics were successfully fabricated using an extrusion-based 3D printer, with optimized printable slurry recipes and 3D printing parameters, as well as two-step vacuum sintering profiles. The resulting ceramics achieved high density and transparency, demonstrating the competitiveness of 3D printing in transparent ceramic processing.
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.
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