无机材料学报2026，Vol.41Issue(8)：1103-1109,7.DOI:10.15541/jim20250386
磁铅石型稀土六铝酸盐热障涂层材料的制备与性能
Fabrication and Properties of Magnetoplumbite-type Rare-earth Hexaaluminate Thermal Barrier Coating Materials
摘要
Abstract
Magnetoplumbite-type rare-earth hexaaluminates RMgAl11O19(RMA,R=La,Pr,Nd,Sm,Gd)emerged as promising candidates for next-generation thermal barrier coatings(TBCs)capable of operating at temperatures exceeding 1300℃,owing to their high melting points,low thermal conductivity,and remarkable sintering resistance.To elucidate the influence of rare-earth ion substitution on the structural and functional properties,a series of single rare-earth cation substituted RMA ceramics were synthesized via a solid-state reaction route and densified using spark plasma sintering.Their phase composition,microstructure,thermophysical,and infrared radiative properties were systematically characterized by different measurements.All samples crystallize in a hexagonal magnetoplumbite-type structure,with both lattice parameters and unit cell volumes exhibiting a gradual contraction as the rare-earth ionic radius decreases.The grain growth rate generally increases with a reduction in ionic radius.The thermal diffusivity and conductivity of RMA ceramics decrease with increasing temperature,reaching a minimum of 2.86-3.19 W/(m·K)in the temperature range of 25-1000℃.The average thermal expansion coefficients vary from 8.22×10-6 to 8.70×10-6 K-1 between 200 and 1300℃,indicating comparable thermo-physical properties across different compositions.In contrast,notable differences appear in the 3-5 μm infrared band,where PrMA exhibits the highest average emissivity(0.746)and LaMA exhibits the lowest(0.493),reflecting the critical role of rare-earth cation electronic structure in radiative behavior.This work elucidates the coupled thermal-radiative modulation mechanism induced by rare-earth ion substitution in magnetoplumbite-type hexaaluminates,offering valuable insights for the design of high-temperature TBC materials that combine low thermal conductivity with high infrared radiative performance.关键词
热障涂层/RMgAl11O19/晶粒生长速率/热物理性能/红外辐射性能Key words
thermal barrier coating/RMgAl11O19/grain growth rate/thermo-physical property/infrared radiation property分类
通用工业技术引用本文复制引用
许茗奕,熊瑛,王博,张艺馨,陈文博,曹学强..磁铅石型稀土六铝酸盐热障涂层材料的制备与性能[J].无机材料学报,2026,41(8):1103-1109,7.基金项目
国家自然科学基金重大研究计划项目(92360304) （92360304）
国家自然科学基金青年项目(52302109) （52302109）
湖北省自然科学基金青年项目(2023AFB075) （2023AFB075）
国家自然科学基金重点支持项目(92060201) National Natural Science Foundation of China(92360304) （92060201）
National Natural Science Foundation of China(52302109) （52302109）
Natural Science Foundation of Hubei Province,China(2023AFB075) （2023AFB075）
National Natural Science Foundation of China(92060201) （92060201）
