One pot synthesis of high entropy rare earth zirconate ceramics with low thermal conductivity for high performance thermal-barrier coatings

Abstract

By using the one pot synthesis method, zirconate rare earth ceramic powders with high entropy and low thermal conductivity were prepared. The phase and microstructure of the prepared powder and sintered ceramics were analyzed by x-ray diffraction, Raman spectroscopy and scanning electron microscopy. The results show that the prepared powder may be used directly for atmospheric plasma spraying. The ceramic prepared from this powder exhibited a density of 96.87 %, improved thermal conductivity and thermal expansion coefficient. Coating materials were prepared using an atmospheric plasma spraying system, with the LSZC coating demonstrating the highest bond strength of 48.81 MPa and thermal shock resistance of 18 cycles.