Environment-friendly Ca2+/Cr3+co-doping LaAlO3 ceramics with excellent infrared radiation performance for energy-saving  

作　　者：Xinglai Yuan Qinghu Wang Runke Wu Shaobai Sang Yibiao Xu Xiong Liang Liping Pan Bingbing Fan Yawei Li Rui Zhang Jiangtao Li Olena Volkova 

机构地区：[1]The State Key Laboratory of Refractories and Metallurgy,Joint International Research Laboratory of Refractories and Metallurgy,Wuhan University of Science&Technology,Wuhan 430081,China [2]School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China [3]Institute of Advanced Ceramics,Henan Academy of Sciences,Zhengzhou 450046,China [4]Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China [5]Institute of Iron and Steel Technology,TU Bergakademie Freiberg,Freiberg 09599,Germany

出　　处：《Journal of Advanced Ceramics》2025年第1期205-214,共10页先进陶瓷(英文)

基　　金：financially supported by the National Natural Science Foundation of China(Nos.52372029,U22A20127,52304356,52102028,and 92263205);the Key Research and Development Plan Project in Hubei Province(No.2023BCB100).

摘　　要：Ca2+/Cr3+co-doped LaAlO3 infrared(IR)ceramics have been proven to be potential energy-saving materials for high-temperature industries because of their high emissivity and high-temperature stability.However,Cr6+formation commonly occurs in materials and poses environmental and health risks,such as Cr6+dissolution in water and CrO3(g)volatilization.In this study,we combined high emissivity with in situ detoxification by introducing residual Al2O3 into Ca2+/Cr3+co-doped LaAlO3 ceramics.Compared with the undoped ceramics,the addition of 20 wt%residual Al2O3 resulted in a 78.5%reduction to 18.44 mg/kg(lower than the EU standard of 20 mg/kg)in Cr6+dissolution and a decrease in 77.8%CrO3(g)volatilization.This significant detoxification effect can be attributed to the formation of CaAl12−xCrxO19.Additionally,as the residual Al2O3 content increased from 5 to 20 wt%,the ceramics maintained high emissivity,above 0.896 in the near-infrared band and 0.781 in the mid-infrared band.Furthermore,the IR coating effectively increased the surface temperature(from 767.1 to 790.7℃/min)and the heat radiation of the heating source,increasing the heating rate from 31.7 to 34.6℃/min during water heating.This work offers a promising approach for designing environmentally friendly IR ceramics with excellent IR performance for energy-saving applications in the high-temperature industry.

关 键 词：infrared(IR)radiation ENERGY-SAVING environmentallyfriendly Cr^(6+)suppression LaAlO_(3) 

分 类 号：TQ1[化学工程]