摘要
Ca^(2+)/Cr^(3+)co-doped LaAlO_(3) 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,Cr^(6+)formation commonly occurs in materials and poses environmental and health risks,such as Cr^(6+)dissolution in water and CrO_(3)(g)volatilization.In this study,we combined high emissivity with in situ detoxification by introducing residual Al_(2)O_(3) into Ca^(2+)/Cr^(3+)co-doped LaAlO_(3) ceramics.Compared with the undoped ceramics,the addition of 20 wt%residual Al_(2)O_(3) resulted in a 78.5%reduction to 18.44 mg/kg(lower than the EU standard of 20 mg/kg)in Cr^(6+)dissolution and a decrease in 77.8%CrO_(3)(g)volatilization.This significant detoxification effect can be attributed to the formation of CaAl_(12−x)Cr_(x)O_(19).Additionally,as the residual Al_(2)O_(3) 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.
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).
作者简介
Corresponding author:Qinghu Wang,E-mail:wangqinghu@wust.edu.cn;Corresponding author:Bingbing Fan,E-mail:fanbingbing@zzu.edu.cn。
