Research Progress on Lanthanum Zirconate Porous Materials for Thermal Insulation

Lanthanum zirconate porous material is a kind of high porosity material with nanoparticles or microparticles as the basic building unit.These materials exhibit exceptionally low thermal conductivity and maintain remarkable phase stability up to their melting point, making them particularly promising for thermal insulation applications in the aerospace industry.However, Lanthanum zirconate porous material's sintering problems cause the collapse and shrinkage of pore structure, resulting in relatively poor thermal resistance and thermal insulation.Researchers have employed precise control over pore size and particle dimensions to optimize the mesostructure, leading to a significant reduction in thermal conductivity.Specifically, template-based methods enable precise control over pore size at the micro-nano scale, while Sol-Gel techniques combined with varied drying processes facilitate regulation of particle dimensions at the nanoscale.Concurrently, the introduction of single-or multi-element doping has proven effective in inducing controlled lattice distortion, which subsequently weakens thermodynamic diffusion processes and suppresses hightemperature grain growth.This dual strategy of morphological control and compositional engineering has substantially improved both the thermal insulation capability and temperature resistance of lanthanum zirconate porous materials.This review begins by introducing the crystal structure of lanthanum zirconate, highlighting its advantages in