Three-dimensional printing of flash-setting calcium aluminate cement |
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Authors: | Anne-Kathrin Maier Laura Dezmirean Julia Will Peter Greil |
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Affiliation: | 1.Department of Materials Science (Glass and Ceramics),University of Erlangen-Nürnberg,Erlangen,Germany |
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Abstract: | Three-dimensional indirect printing of flash-setting calcium aluminate cement (CAC) was investigated. Upon water injection
into a biphasic mixture of tricalcium aluminate (3CaO·Al2O3) and dodecacalcium heptaaluminate (12CaO·7Al2O3) (phase ratio 0.56/0.44) initially a gel formed acting as a bonding phase which stabilizes the printed object geometry. Post-exposure
in water finally resulted in the formation of 2CaO·Al2O3·8H2O and 4CaO·Al2O3·19H2O reaction phases as confirmed by SEM, X-ray diffraction, and FTIR analyses. Reduction of porosity by volume expansion upon
hydrolysis reaction from 50% after printing to 20% after post-treatment gave rise for an increase of compressive strength
from 5 to 20 MPa, respectively. A bone regenerating scaffold for a micro-vascular loop model was fabricated by 3D printing
and hydraulic reaction bonding to demonstrate the potential of using flash-setting calcium aluminate cement powder for biomedical
ceramic applications. |
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