Manipulation of ZrO 2 /CaZrO 3 fibrous membrane with high thermal stability and NIR reflectivity

Abstract Grain size control is an important aspect to manipulate the microstructure and high temperature stability of ceramic fibers. In the present work, phase competition mechanism was proposed to regulate the grain size of ZrO 2 /CaZrO 3 composite fibers. Calcium precursor with different molar ratio of Ca/Zr was introduced to the zirconia system not only for phase stabilization of ZrO 2 but also for phase competition between solid‐solution Ca x Zr 1‐x O 2‐ x and new phase CaZrO 3 . Effects of Ca/Zr molar ratio on the thermal pyrolysis, crystallization, solid reaction of precursor fibers were fully explored. The change of grain size of fibers with various Ca/Zr molar ratio was characterized and discussed. Furthermore, the near‐infrared reflectivity and high‐temperature stability of fibrous membranes were also presented. The results indicated that ZrO 2 /CaZrO 3 fibrous membrane has promising applications in high‐temperature for the excellent thermal stability and high near infrared (NIR) reflectivity.