The present invention relates to a high-entropy
rare earth titanate ceramic coating material and a preparation method thereof, belonging to the technical field of high-entropy
ceramic materials. The
phase composition of the
coating material is (La 0.3 K 0.1 Ca 0.2 Sr 0.2 Ba 0.2 )TiO 3+δ . The preparation method is to wet ball-mill and mix the
raw material powders evenly to form a
slurry, dry it, then heat it up to 900 °C to 1000 °C and keep it at a constant temperature for pre-
calcination for 2 h to 3 h, cool it with the furnace, then heat it up to 1300 °C to 1400 °C and keep it at a constant temperature for
calcination for 10 h to 15 h, and then cool it down to obtain the
coating material. The coating material is successfully prepared into an ideal new high-entropy
rare earth titanate ceramic coating material by the design addition of
doping elements and by adjusting process parameters, which changes its
crystal structure,
microstructure and
oxygen vacancy defect concentration, making the density of the coating bulk material greater than 98.4%, the Vickers
hardness 10 GPa to 12 GPa, and the
thermal conductivity 1.39 W·m ‑1 ·k ‑1 ~1.75 W·m ‑1 ·k ‑1 ; The process flow for preparing the coating material by the high-temperature
solid-
phase reaction method is simple, the preparation cost is low, and it is easy to promote.