Polymer‐Derived Ultra‐High Temperature Ceramics (UHTCs) and Related Materials

Ultra‐high temperature ceramics (UHTCs) represent an emerging class of materials capable of providing mechanical stability and heat dissipation upon operation in extreme environments, e.g., extreme heat fluxes, chemically reactive plasma conditions. In the last few decades, remarkable research effor...

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Veröffentlicht in:Advanced engineering materials 2019-08, Vol.21 (8), p.n/a
Hauptverfasser: Ionescu, Emanuel, Bernard, Samuel, Lucas, Romain, Kroll, Peter, Ushakov, Sergey, Navrotsky, Alexandra, Riedel, Ralf
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Sprache:eng
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Zusammenfassung:Ultra‐high temperature ceramics (UHTCs) represent an emerging class of materials capable of providing mechanical stability and heat dissipation upon operation in extreme environments, e.g., extreme heat fluxes, chemically reactive plasma conditions. In the last few decades, remarkable research efforts and progress were done concerning the physical properties of UHTCs as well as their processing. Moreover, there are vivid research activities related to developing synthetic access pathways to UHTCs and related materials with high purity, tunable composition, nano‐scaled morphology, or improved sinterability. Among them, synthesis methods considering preceramic polymers as suitable precursors to UHTCs have received increased attention in the last few years. As these synthesis techniques allow the processing of UHTCs from the liquid phase, they are highly interesting, e.g., for the fabrication of ultra‐high temperature ceramic composites (UHT CMCs), additive manufacturing of UHTCs, etc. In the present review, UHTCs are in particular discussed within the context of their physical properties as well as energetics. Moreover, various synthesis methods using preceramic polymers to access UHTCs and related materials (i.e., (nano)composites thereof with silica former phases) are summarized and critically evaluated. In the present review, various synthesis methods using polymeric precursors to provide ultra‐high temperature ceramics (UHTCs) and their nanocomposites with silica former phases are introduced in detail and discussed in a comprehensive manner. Additionally, the review addresses some general structural and thermodynamic aspects related to UHTC phases.
ISSN:1438-1656
1527-2648
DOI:10.1002/adem.201900269