Simulation Design of Joule Heat Sintering Process and Preparation of GdTaO<sub>4</sub> Ceramics

In light of the current practical challenges where the conventional high-temperature solid-phase method falls short in satisfying the demands for high-throughput synthesis and material screening, the ultrafast high-temperature sintering (UHS) technique enables the synthesis of inorganic materials with high melting points. However, the temperature of conductive and ceramic materials in the UHS process is challenging to measure accurately. The temperature, time, and heating element design of the UHS process were studied based on finite element simulation and experimental analysis. The simulation and experimental results show that the temperature field distribution of carbon felt is asymmetrical. The center temperature difference on the upper surface of GdTaO₄ ceramic with 0 and 0.2 mm gap is about 440 K. Finally, the simulation results of different sizes of carbon felt temperature field show that the design of appropriate size conductive materials is beneficial to improve the heat transfer efficiency and the temperature uniformity of ceramic surface.