Electrospun CaZrO ₃ ‐BaZrO ₃ fibrous membrane with enhanced high‐temperature stability and flexibility

Abstract Calcium zirconate (CaZrO 3 )‐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 CaZrO 3 ‐based fibrous membrane without sacrificing stability, modification methods should be conducted. In the present work, a CaZrO 3 ‐BaZrO 3 dual‐phasic structure was proposed to modify the high‐temperature properties from the standpoint of phase competition. CaZrO 3 ‐BaZrO 3 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 CaZrO 3 ‐BaZrO 3 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 CaZrO 3 ‐based fibrous membranes. The higher thermal stability and flexibility of the CaZrO 3 ‐BaZrO 3 fibrous membrane at 1200°C would make it a good candidate for high‐temperature insulating, high‐temperature supporting, and high‐temperature filtration.