Al2O3 enhanced bi-phase high-entropy ceramic composites
Source abstract
Abstract
One limitation of high-entropy ceramics is the low toughness that could hinder their implementations in the relevant industries despite the diverse potential applications. This challenge is increasingly attempted in recent years with high-entropy ceramic composites which consisted of high-entropy ceramic matrix and secondary phase. A suitable secondary phase candidate is Al 2O 3 which to-date has not been reported for such ceramic composites. In this work, bi-phase high-entropy ceramic composites of cubic fluorite oxide matrix and Al 2O 3 secondary phase were in situ synthesized from HfO 2, ZrO 2, CeO 2, CaO and Al 2O 3 nano powders via solid-state reaction method. Variation of thermal and mechanical properties of the composites with Al ratio was due to the combined effects of the inherent properties of Al 2O 3, concentrations of grain boundary and of oxygen vacancies. The high-entropy ceramic composites enhanced by Al 2O 3 were also compared with yttria-stabilised zirconia for potential application as thermal barrier coating material.
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Research context
OpenAlex topics: High Entropy Alloys Studies · High-Temperature Coating Behaviors · Advanced ceramic materials synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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