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Low Cost, Near Net Shape Ceramic Composites by Polymer Infiltration and Pyrolysis
Published in Golam M. Newaz, Ronald F. Gibson, Proceedings of the Eighth Japan-U.S. Conference on Composite Materials, 2019
L. V. Interrante, K. Moraes, W. Sherwood, J. Jacobs, C. Whitmarsh
Reports relating to the use of polymer precursors as the SiC matrix source have been quite limited [4], although rather more attention appears to have been directed towards the use of siloxanes as silicon oxycarbide (“black glass”) matrix sources [5]. In the latter case, the severe limitations on the effective use temperature of the final composite (as low as 600 °C under certain conditions) set corresponding limits on the range of potential applications. As far as SiC precursors are concerned, limited work has been carried out by using both the Yajima “polycarbosilane” and a vinylic polysilane as the matrix source; however, perhaps due to the need for a solvent in the former case and a relatively low ceramic yield in the latter, the final composites were not well filled and exibited relatively low strengths. Moreover, these precursors are known to produce “SiC” with a large amount of excess carbon, with expected detrimental effects in terms of oxidative stability and mechanical properties.
Additive manufacturing of flexible polymer-derived ceramic matrix composites
Published in Virtual and Physical Prototyping, 2023
Jun Ou, Minzhong Huang, Yangyang Wu, Shengwu Huang, Jian Lu, Shanghua Wu
Polymer-derived ceramics (PDCs) are a class of ceramic materials that can be formed directly from precursors by pyrolysis, without the need for sintering (Colombo et al. 2010; Xia et al. 2020). For instance, polycarbosilane, polysiloxane, polysilazane, and polyborosilazane can be pyrolyzed to silicon carbide (SiC), silicon oxycarbide (SiOC), silicon carbon nitride (SiCN), and silicon boron carbon nitride (SiBCN), respectively. Moreover, the pyrolysis of PDCs is completed at relatively low temperatures (typically 800–1300°C) (He et al. 2020; Zanchetta et al. 2016), and PDCs are resistant to oxidation, creep, and phase separation at temperatures up to 1500°C and higher (Colombo et al. 2010; Zanchetta et al. 2016). Furthermore, preceramic polymers can be modified such that they can be converted to ceramic parts with the compositions and microstructures necessary to exhibit desired performances and functionalities (Riedel et al. 2006; Zhou et al. 2020). In particular, flexible preceramic polymer materials can be easily designed to meet the demand for 3D-printed and deformable green ceramic parts, which provides the opportunity to realise the 4D printing of deformable ceramic structures that can be stably transformed into various shapes.