Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 41, Issue 13, Pages 6677-6686Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2021.06.012
Keywords
Fused deposition modeling (FDM); Mullite; Polymer derived ceramic (PDC); Polysiloxane; Sintering additive
Categories
Funding
- Swiss National Science Foundation (SNSF) [200021_184691/1]
- Swiss National Science Foundation (SNF) [200021_184691] Funding Source: Swiss National Science Foundation (SNF)
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By optimizing the recipe and using MgO sintering additive, the density of mullite ceramic can be achieved while reducing the impact of printing direction on mechanical strength. The study found that the closed porosity formed during the degassing of preceramic polymer contributes to the low Weibull modulus observed.
An optimized recipe for 3D printing of Mullite-based structures was used to investigate the effect of MgO sintering additive on the processing stages and final ceramic properties. To achieve dense 3:2 mullite, ceramic filaments were prepared based on an alumina powder, a methyl silicone resin, EVA elastomeric binder and MgO powder. Using 1 wt% MgO and a dwell time of 5 h at 1600 degrees C, a dense mullite structure could be obtained from filaments with a diameter of 1.75 mm. Ceramic structures with and without sintering additive were printed in vertical and horizontal direction, to investigate the effect of printing direction on mechanical strength after sintering. Using four-point bending test, it was demonstrated that by using MgO, the printing orientation did not affect the mechanical strength significantly anymore. The low Weibull modulus could be explained by the closed porosity that emerge during the degassing of the preceramic polymer due to cross-linking.
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