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Morphology and Characterisation of Novolac–LDPE-Based Mixtures as Matrix for Injection Moulded Green Bodies for Bio-Based SiC Ceramics

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Wood K plus-Kompetenzzentrum Holz GmbH, Division Biobased Composites and Processes, Altenberger Strasse 69, 4040 Linz, Austria
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Center for Surface and Nanoanalytics (ZONA), Johannes Kepler University Linz, Altenberger Strasse 69, 4040 Linz, Austria
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Author to whom correspondence should be addressed.
This paper is an expanded version of a conference paper which has been presented at: Mihalic, M.; Soares de Sousa, F.; Burzic, I.; Hinterberger, A.; Stifter, D.; Fürst, C. Morphology and Characterisation of Novolac-LDPE Based Mixtures as Matrix for Injection Moulded Green Bodies for Bio-based SiC Ceramics. In Proceedings of the ICCST/12—12th International Conference of Composite Science and Technology, Sorrento, Italy, 8–10 May 2019.
Ceramics 2019, 2(3), 536-550; https://doi.org/10.3390/ceramics2030041
Received: 30 June 2019 / Revised: 21 August 2019 / Accepted: 29 August 2019 / Published: 9 September 2019
This work focuses on the influence of the composition of novolac–LDPE-based mixtures, which serve as a matrix for the green bodies for bio-based silicon carbide (C/Si/SiC) ceramics, on the morphology and the mechanical properties of the green bodies and the ceramics produced thereof. The green bodies were obtained through compounding and injection moulding, and were characterised by scanning electron microscopy (SEM) and mechanical testing. Selected formulations were reinforced with natural fibres, pyrolysed to yield porous carbon templates, and converted into C/Si/SiC ceramics via liquid silicon infiltration. The carbon and ceramic specimens were characterised by light optical microscopy (LOM) and mechanical testing. Without further additives, very coarse morphologies of the novolac–LDPE-based mixtures were obtained, but the miscibility could be improved by the addition of a coupling agent and a lubricant. The pore structure of the carbon specimens was dependent on the phase distribution in the green bodies, and in turn determined the morphology of the C/Si/SiC ceramics. In all steps of the process chain, the morphology had a very strong influence on the mechanical properties. From green bodies with a homogeneous phase distribution, ceramic specimens with a SiC content of up to 75 vol% could be obtained. View Full-Text
Keywords: silicon carbide; natural fibre composites; injection moulding; bio-based; morphology; mechanical properties silicon carbide; natural fibre composites; injection moulding; bio-based; morphology; mechanical properties
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Mihalic, M.; Soares de Sousa, F.; Burzic, I.; Hinterreiter, A.; Stifter, D.; Fürst, C. Morphology and Characterisation of Novolac–LDPE-Based Mixtures as Matrix for Injection Moulded Green Bodies for Bio-Based SiC Ceramics. Ceramics 2019, 2, 536-550.

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