(1. Kunming University of Science and Technology, Kunming 650093, China; 2. National Defense Science and Technology Innovation Research Institute, PLA Academy of Military Sciences, Beijing 100071, China)
Abstract：Thermal barrier coatings (TBCs) have good thermal insulation to protect the high-temperature components of aircraft engine, gas turbine and supersonic aircraft, et al. TBCs are applied to prolong the lifetime and increase the operation temperature of high-temperature components. Low thermal conductivity, high thermal expansion coefficients, comparatively low Young’s modulus and high hardness are required by TBCs. In this work, ANb2O6 (A=Ca, Mg, Co, Ni) ceramics are synthesized by a solid-state reaction, and their crystal structures, hardness, Young’s modulus, thermal conductivity and thermal expansion coefficients (TECs) are systematically studied. The maximum value of hardness reaches 7.8GPa, and their Young’s modulus are relatively low (100-180GPa). The lowest thermal conductivity reaches 1.59W/(m·K) (1200℃), and the highest TECs is 9.1×10-6 K-1 (1200℃). The excellent thermal/mechanical properties pronounce that ANb2O6 ceramics are potential TBCs smaterials.
2021, 
