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High-entropy ceramics (HECs) are an emerging class of materials with unique compositions and promising properties for advanced engineering applications. My research focuses on understanding how these ceramics interact with metals at high temperatures, particularly in the context of joining technologies. Reliable ceramic–metal interfaces are essential for enabling applications ranging from structural composites to protective coatings and high-temperature components.

During my PhD, I investigated the joining of high-entropy carbides and borides using techniques such as brazing and diffusion bonding. A key aspect of this work was studying how molten metals interact with ceramic surfaces. For example, I examined the wetting behaviour of Cu and AgCuTi alloys on (HfTaZrNbTi)B₂ and (HfTaZrNbTi)C ceramics, which led to the successful use of AgCuTi as a filler material for brazing these ceramics [https://doi.org/10.1016/j.oceram.2025.100792]. In another study, I explored the interaction of Ni-based systems with high-entropy carbides, where we observed the formation of stable carbide phases at the interface, preventing detrimental graphite formation and improving interfacial integrity [https://doi.org/10.1016/j.jmrt.2025.09.182]. Figure 1 highlights selected interfacial behaviours of high-entropy ceramics in contact with metals at elevated temperatures.

In addition to joining, my work contributes to a broader understanding of ceramic–metal interactions that are also relevant for developing novel cermets and multifunctional composites. I have also investigated the use of high-entropy alloys as interlayers for joining high-entropy ceramics, opening new possibilities for designing compatible material systems.

My research has been enriched through international collaborations, including research stays at Fraunhofer IKTS (Germany), Empa (Switzerland), and CNR-ICMATE (Italy). These experiences allowed me to study wetting, interdiffusion, and microstructural evolution at ceramic–metal interfaces using a wide range of material systems.

Looking ahead, based on my research experience, I aim to further explore multifunctional composites based on high-entropy materials, with particular emphasis on tailoring interfaces and phase interactions at elevated temperatures. By integrating fundamental understanding with application-driven design, I hope to advance materials that not only exhibit robust mechanical performance but also offer tunable functional properties. Ultimately, my goal is to contribute to innovative material solutions that address emerging challenges in extreme environments and next-generation engineering systems.

“Understanding how ceramics and metals interact at high temperatures is not only scientifically fascinating, but also essential for creating the next generation of materials that can withstand the most demanding conditions.”

Naser Hosseini

Institute of Inorganic Chemistry, Slovak Academy of Sciences, Slovakia.

E-mail:
naser.hosseini@savba.sk

LinkedIn Profile:
www.linkedin.com/in/naser-hosseini