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3D-Printed Hermetic Alumina Housings

Eickenscheidt, Max; Langenmair, Michael; Dbouk, Ahmad; Nötzel, Dorit; Hanemann, Thomas; Stieglitz, Thomas

Abstract (englisch):
Ceramics are repeatedly investigated as packaging materials because of their gas tightness,
e.g., as hermetic implantable housing. Recent advances also make it possible to print the established
aluminum oxide in a Fused Filament Fabrication process, creating new possibilities for manufacturing
personalized devices with complex shapes. This study was able to achieve integration of channels
with a diameter of 500 m (pre-sintered) with a nozzle size of 250 m (layer thickness 100 m) and
even closed hemispheres were printed without support structures. During sintering, the weightbearing
feedstock shrinks by 16.7%, resulting in a relative material density of 96.6%. The well-known
challenges of the technology such as surface roughness (Ra = 15–20 m) and integrated cavities
remain. However, it could be shown that the hollow structures in bulk do not represent a mechanical
weak point and that the material can be gas-tight (<10􀀀12 mbar s􀀀1). For verification, a volume-free
helium leak test device was developed and validated. Finally, platinum coatings with high adhesion
examined the functionalization of the ceramic. All the prerequisites for hermetic housings with
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Verlagsausgabe §
DOI: 10.5445/IR/1000128284
Veröffentlicht am 11.01.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Werkstoffkunde (IAM-WK)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 11.01.2021
Sprache Englisch
Identifikator ISSN: 1996-1944
KITopen-ID: 1000128284
HGF-Programm 43.22.03 (POF IV, LK 01) Printed Materials and Systems
Erschienen in Materials
Verlag MDPI
Band 14
Heft 1
Seiten 200
Vorab online veröffentlicht am 03.01.2021
Schlagwörter ceramic; fused filament fabrication; alumina; scaffold; metal-ceramic bond; implant
Nachgewiesen in Scopus
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