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基于红外高发射率材料的应用,用固相法制备了Zn1-xAlxO(x=0.01,0.02,0.05,0.07)粉末,并研究预煅烧和二次煅烧后样品的红外发射率。X射线衍射和扫描电镜分析结果表明,当Al掺杂浓度达到2%(原子比)时,出现了尖晶石相ZnAl2O4。预煅烧和二次煅烧后的样品结晶质量差,有尖晶石相ZnAl2O4形成。红外发射率分析表明,1200℃时,随着掺杂浓度的增大,样品在3～5μm,8～14μm,1～22μm三个波段内的发射率都降低了。随着煅烧温度的升高,在8～14μm波段内,Zn0.99Al0.01O发射率先升高后降低,在0.984～0.987之间。Zn0.99Al0.01O经过预煅烧和二次煅烧后,在这三个波段内的发射率都升高了。二次煅烧温度为1200℃时,得到的8～14μm内的发射率最高,为0.989。二次煅烧温度为1300℃的样品在三个波段内的整体发射率大于0.95。
Based on the application of high infrared emissivity materials, Zn1-xAlxO (x = 0.01,0.02,0.05,0.07) powders were prepared by solid-state method and the infrared emissivity of pre-calcined and post-calcined samples was investigated. X-ray diffraction and scanning electron microscopy analysis showed that spinel phase ZnAl2O4 appeared when the doping concentration of Al reached 2% (atomic ratio). Pre-calcined and secondary calcined samples have poor crystalline quality and spinel ZnAl2O4 formation. Infrared emissivity analysis shows that the emissivity decreases with the increase of doping concentration in the range of 3 ~ 5μm, 8 ~ 14μm and 1 ~ 22μm at 1200 ℃. With the increase of calcination temperature, the emissivity of Zn0.99Al0.01O first increased and then decreased from 0.984 to 0.987 in the band of 8 ~ 14μm. Zn0.99Al0.01O after pre-calcination and secondary calcination, in these three bands emissivity increased. When the secondary calcination temperature is 1200 ° C, the emissivity within 8 to 14 μm obtained is the highest, which is 0.989. The overall emissivity of the samples with the secondary calcination temperature of 1300 ℃ in three wavebands was greater than 0.95.