Hierarchically porous lanthanum zirconate foams with low thermal conductivity from particle‐stabilized foams

Abstract

Abstract Lanthanum zirconate (LZO) ceramic foams with hierarchical pore structure were fabricated by particle‐stabilized foaming method for the first time, and the as‐prepared ceramics have high porosity of 90.7%‐94.9%, low thermal conductivity, and relatively high compressive strength. The LZO powder was synthesized by solid‐state method. The porosity of the ceramic foams was tailored by suspensions with different solid loadings (20‐40 wt%). The sample with porosity of 94.9% has thermal conductivity of 0.073 W/(m·K) and compressive strength of 1.19 MPa, which exhibits outstanding property of thermal insulation and mechanical performance, indicating that LZO ceramic foam is a promising thermal insulation material in high temperature applications.