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Before delving into the application of ultrasonic pyrolysis in high-temperature superconducting ceramics, let's understand what ultrasonic pyrolysis is, as well as what high-temperature superconducting ceramics are.
Ultrasonic pyrolysis involves introducing metal salt solutions in a fine mist form into high-temperature atmospheres. This leads to solvent evaporation and the thermal decomposition of the metal salts. Due to supersaturation, a solid phase precipitates. Through processes like particle drying, particle thermal decomposition, and sintering, fine powders are obtained.
Figure 1. Superconducting
Superconducting ceramics refer to ceramic materials with superconducting properties. They have zero resistance under full conductivity and display complete diamagnetism in external magnetic fields. Generally, materials approach zero resistance at absolute zero and are termed as superconductors. The temperature at which they become superconductors is called the critical temperature. Since their discovery, superconducting materials have found widespread applications. However, their existence at extremely low temperatures, like that of liquid nitrogen, limits their use. With ongoing research, scientists have discovered and prepared superconducting materials with varying critical temperatures. Based on their critical temperatures, they are classified into high-temperature and low-temperature superconducting materials. High-temperature superconducting ceramics refer to those with relatively higher critical temperatures.
During the preparation of high-temperature superconducting ceramics, various components need to be synthesized and molded. The preparation methods can be broadly categorized into three types: solid-phase, liquid-phase, and gas-phase. Each relies on solid, liquid, or gas precursors, respectively, which then undergo a series of procedures to produce the final superconducting material. The ultrasonic pyrolysis method we are discussing today combines the principles of both liquid-phase and gas-phase techniques. As previously mentioned, in the ultrasonic pyrolysis process, the precursor is in liquid form. Mixing raw materials in solution ensures even component distribution and precise control of the stoichiometric ratio. This method is especially suited for preparing multi-component composite powders. Moreover, the fine powders come from the drying of tiny suspended droplets, and the particles generally assume a regular spherical shape with minimal aggregation. Therefore, there's no need for subsequent washing or grinding, ensuring high purity, high activity, and uniform particle size of the products.
Figure 2.Siansonic Ultrasonic Pyrolysis System USP20
Siansonic Technology offers an ultrasonic pyrolysis system that integrates ultrasonic atomization technology, high-temperature reaction furnaces, and electrostatic nano-collection devices. we provide clients with solutions for the ultrasonic pyrolysis system of ultra-fine powders, from research and pilot scale to mass production. It's particularly suitable for the preparation of nano and sub-micron level ultra-fine powders of ceramics, superconducting materials, and other multi-metal oxides.
