Electrospun CaZrO3-BaZrO3 fibrous membrane with enhanced high-temperature stability and flexibility

Calcium zirconate (CaZrO₃)-based fibrous membrane is a promising candidate in high-temperature areas for its high melting point, good phase stability up to 1900°C, low thermal conductivity, and low cost. To further enhance the high temperature flexibility of CaZrO₃-based fibrous membrane without sacrificing stability, modification methods should be conducted. In the present work, a CaZrO₃-BaZrO₃ dual-phasic structure was proposed to modify the high-temperature properties from the standpoint of phase competition. CaZrO₃-BaZrO₃ fibrous membranes were prepared with the combination of the electrospinning method and pyrolysis process. The decomposition process, phase transformation, crystallize size, and microstructure evolution of CaZrO₃-BaZrO₃ precursor fibrous membrane were characterized. The grain size, particle size, NIR reflectivity, high-temperature stability, fire retardancy, and high-temperature flexibility were also characterized and compared with other CaZrO₃-based fibrous membranes. The higher thermal stability and flexibility of the CaZrO₃-BaZrO₃ fibrous membrane at 1200°C would make it a good candidate for high-temperature insulating, high-temperature supporting, and high-temperature filtration.