Formation of Barium Zirconate Fibers for High‐Temperature Thermal Insulation Applications

Abstract

A simple and cost‐effective method was used for the fabrication of BaZrO 3 ( BZ ) fiber. The crystallization of BZ fiber was a simultaneous process with the decomposition of Ba CO 3 which was formed during the pyrolysis process of the precursor fiber. The surface cracks of the fiber induced by the organic decomposition converted to grain boundaries during the grain growth at high temperatures. A simple model was used to describe the evolution mechanism of the transformation from surface cracks to grain boundaries. High‐temperature resistance test results show that the fiber brick can keep the high‐temperature stability at 1300°C with the density of about 0.23 g/cm 3 .