J. Mater. Sci. Technol. ›› 2025, Vol. 234: 122-133.DOI: 10.1016/j.jmst.2024.12.104

• Research Article • Previous Articles     Next Articles

High-entropy La(Al0.2Co0.2Fe0.2Ni0.2Cr0.2)O3-δ and La(Al0.2Co0.2Fe0.2Ni0.2Mn0.2)O3-δ ceramics with broad-band high emissivity for long-term energy-saving

Runke Wua, Qinghu Wanga,*, Xueqing Wanga, Liping Pana,*, Shaobai Sanga, Yangxi Liua, Guangyang Wanga, Xiong Lianga, Yibiao Xua, Yawei Lia, Jiangtao Li, Olena Volkovad   

  1. aThe State Key Laboratory of Refractories and Metallurgy, Joint International Research Laboratory of Refractories and Metallurgy, Wuhan University of Science & Technology, Wuhan 430081, China;
    bTechnical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
    cSuzhou Institute for Advanced Research, University of Science and Technology of China, Suzhou 215123, China;
    dInstitute of Iron and Steel Technology, TU Bergakademie Freiberg, Germany
  • Received:2024-10-14 Revised:2024-12-12 Accepted:2024-12-17 Published:2025-11-01 Online:2025-03-26
  • Contact: *E-mail addresses: wangqinghu@wust.edu.cn (Q. Wang), panliping@wust.edu.cn (L. Pan).

Abstract: Infrared radiation (IR) ceramics have been recognized as energy-saving materials for high-temperature industry due to excellent IR performance. However, for conventional IR ceramics, low emissivity in partial band and emissivity degradation during high-temperature service restricted the practical application. Herein, we integrated broad-band high emissivity and slow degradation rate in novel high-entropy perovskite ceramics: La(Al0.2Co0.2Fe0.2Ni0.2Cr0.2)O3-δ (HE-1) and La(Al0.2Co0.2Fe0.2Ni0.2Mn0.2)O3-δ (HE-2). Specifically, the high-energy ceramic HE-1 & HE-2 displayed high emissivity of 0.94/0.90 and 0.90/0.95 in the broad-band of near/mid-infrared (0.76-14 μm). This excellent IR performance can be attributed to impurity energy level absorption, free carrier absorption, and lattice vibration absorption. During high-temperature service, these high-entropy ceramics have much slower emissivity degradation rate than conventional IR ceramic, because of hysteresis diffusion effect. Additionally, energy-saving ratios of 17.70 % and 10.77 % were realized by heating water with porous burner containing HE-1 and HE-2 coating respectively, due to enhanced heat radiation in systems. Thus, these high-entropy IR ceramics have significant application potential for long-term energy-saving in high-temperature industry.

Key words: High-entropy ceramic, Infrared radiation, LaAlO3, Emissivity, Energy-saving