Ultra‐high temperature ceramic (UHTC) and polymorphic structures often experience unique material properties for applications related to aerospace, energy and lightweight designs. Structures made from UHTCs are known to have high thermal thresholds that can withstand temperatures up to 3000 °C without changes in their crystal structure. Alternatively, polymorphic ceramics can have a change in their atomic configuration and crystalline geometry due to external stimuli well before their melting temperature. From a multiscale perspective, UHTC and its composites have a stable structure in terms of crystalline geometry and do not require atomic‐level description to observe the changes in their constitutive relations due to high thermal input. However, UHTC composites can be prone to chemical reactions, such as oxidation, well before their melting temperature which leads to UHTCs exhibiting a self‐healing behavior. Polymorphic structures experience a change in their crystallinity, where atomic‐level characterization and constitutive relations are required in order to describe the changes in their underlying structure in real time. The presented work highlights some of the recent research in describing UHTCs, polymorphic structures and their composites through continuum and atomistic characterization of crystallinity, chemical kinetics, and multiscale depiction.
Characterization of Ultra‐High Temperature and Polymorphic Ceramics
2021-05-24
23 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
ceramics , polymorphic , BCM , multiscale , UHTC , MD
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