Research progress and challenge of high entropy ceramic materials

Abstract

As a new material system, the high entropy ceramics have become a hot research topic in the field of materials because of their unique and adjustable properties benefited by the huge component space, unique microstructure and large configuration entropy. The research of the high entropy ceramics is still in the initial stage at present, especially for the accurate composition design theory, preparation of high purity and high conversion powder, new sintering process and other aspects, which need to be further explored. Therefore, the five high entropy effects, new design theory, powder preparation methods, new sintering methods, comprehensive properties and practical applications of high entropy compounds ceramics were sorted and summarized, the composition design of high entropy ceramics (HEC) by the cluster-plus-glue-atom model (CPGA) was analyzed, and the relationship between the components, microstructure, and performance of HEC was explored deeply. The key development direction of future HEC will still be basic theoretical design, especially for the composition and structure of non oxide HEC. At the same time, the breakthroughs in interdisciplinary fields was sought, such as using artificial intelligence machine learning and 3D printing for sample preparation. Finally, the practical applications in structures, thermal barrier and corrosion resistant coatings, machinery, engineering optics, and magnetism were searched, and the strengthening and failure mechanisms were explored and analyzed in-depth under the investigated working environment.

Keywords

• high entropy ceramic
• composition design
• cluster-plus-glue-atom model (cpga)
• preparation process
• performance and application