![]() ![]() ![]() Electron and phonon thermal conductivity in high entropy carbides with variable carbon content. Phase stability and mechanical properties of novel high entropy transition metal carbides. High-entropy high-hardness metal carbides discovered by entropy descriptors. The superior thermo-physical performance above enables (La 0.2Nd 0.2Sm 0.2Eu 0.2Gd 0.2) 2Ce 2O 7 a promising TBC material. Benefiting from the solid solution strengthening effect, it shows a higher hardness of 8.72 GPa than the corresponding single component compounds. Through high-temperature in-situ X-ray diffraction (XRD) measurement, this material shows excellent phase stability up to 1400 ☌. K −1 at 1400 ☌, which can be explained by the existence of high concentration oxygen vacancies and highly disordered arrangement of multicomponent cations in the unique high-entropy configuration.Besides, it presents prominent thermal insulation behavior with a low intrinsic thermal conductivity of 0.92 W Notably, it exhibits a much higher TEC of approximately 12.0 × 10 −6 K −1 compared with those of other high-entropy oxides reported in the field of TBCs. The as-prepared multicomponent material is formed in a simple disordered fluorite structure due to the high-entropy stabilization effect. In order to improve the poor thermal expansion property and further reduce the thermal conductivity, high-entropy (La 0.2Nd 0.2Sm 0.2Eu 0.2Gd 0.2) 2Ce 2O 7 is designed and synthesized in this work. However, the relatively low thermal expansion coefficient (TEC) of those materials severely restricts their practical application. More than 10 universities are involved in this program.High-entropy oxides (HEOs) are widely researched as potential materials for thermal barrier coatings (TBCs). The research ares of these projects are (1) Meet the future demands: multifaceted essence of high entropy materials, (2) Application research for high entropy superalloys in aerospace and energy industries, and investigate the underlying science of their critical properties, (3) Tailoring heterogeneous structure to enhance strength-ductility synergy in lightweight Ti-rich medium-entropy alloys with ultra-high specific strength, (4) Development and applications of advanced high-entropy piezoelectric catalyst in water resources treatment, (5) Development on the excellent performance of the lightweight high-entropy alloy CoCrNi(Si/Al), and (6) Development of the theory and industrial application of high-performance high-entropy materials used in high-frequency communication and optoelectronic components. The program will last for three years, and currently six research projects are sponsored. The main purpose of this program are to (1) promote innovation and deep academic research to keep Taiwan’s status in this area, (2) integrate the resources of facilities, manpower and budget to have an efficient development, (3) encourage team work and trains the further leaders for research and development in this area, and (4) asses the research outcomes for continued development and commercialization in the future. The objective of this program is to promote further breakthrough in this new class of materials. To maintain Taiwan’s leadership in these area, National Science and Technology Council of Taiwan initiates the Research Program on Fundamentals and Applications of High-Entropy Materials. In recent years, global research investments on HEAs and HEMs increased in a steady pace. The concept of High-Entropy Alloys (HEAs) and High-Entropy Materials (HRMs) originated from Taiwan about 20 years ago. ![]()
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