Direct Ink Writing of micrometric SiOC ceramic structures using a preceramic polymer

摘要

In this work we manufactured micro-sized SiOC ceramic components by 3D printing (Direct Ink Writing) of a preceramic polymer. Model porous ceramic scaffolds with the lateral dimension of a few millimeters and composed of a continuous ceramic filament similar to 120 mu m thick were produced, and a suitable rheological behavior was obtained by mixing cross-linked preceramic particles with a siloxane resin dissolved in a solvent. The addition of a low amount (0.025-0.1 wt%) of graphene oxide to the ink formulation further improves the structural stability during pyrolysis reducing the shrinkage of the preceramic polymer. Upon pyrolysis at low temperature (1000 degrees C), graphene oxide converted into graphene. The resulting scaffolds possess a good compression strength, of similar to 2.5 MPa for a total porosity of similar to 64 vol% (similar to 3.1 MPa after the addition of 0.1 wt% graphene oxide). (C) 2016 Elsevier Ltd. All rights reserved.