摘要
以三氧化二铁和铝粉为原料,通过燃烧合成方法制备铁铝尖晶石(FeAl_2O_4)。采用XRD、SEM对样品物相结构和微观形貌进行表征,利用紫外-可见-红外分光光度计、IR-2型双波段发射率测试仪测定其红外发射率。对反应合成产物的X射线衍射分析表明,原料质量比在Fe_2O_3/Al=4:1时得到单相的铁铝尖晶石;相对于此组分,反应物中三氧化二铁过量产物中生成氧化亚铁杂质;反应物中铝过量产物存在氧化铝杂质。对铁铝尖晶石红外辐射性能的测试表明:在近红外波段0.75-2.5μm的平均辐射率在0.9以上,在1-22μm、8-14μm、3-5μm波段辐射率分别为0.905、0.938、0.870,具有极高的红外辐射性能。样品中氧化亚铁的存在使得在可见光-近红外波段(390-1500nm)的辐射性能得以提升,且随着氧化亚铁含量的增加辐射性能进一步增强,而含有氧化铝的样品在整个测试波段的红外辐射性能降低。
Commercial ferric oxide and aluminum powder were used as raw materials to prepare hercynite(FeAl_2O_4) by combustion synthesis.Phases and morphology of the prepared materials were characterized by XRD and SEM,respectively.The infrared emissivity of the samples were also been investigated by UV-Vis-NIR spectrophotometer and dual-band infrared emissometer(IR-2).The diffraction pattern of the XRD indicated that the hercynite single phase can be obtained from the sample with the quantity ratio of raw materials Fe_2O_3/Al=4:1.Compared with this component,ferrous oxide would be detected with the increasing of the ferric oxide in the reactants;and alumina would be found with aluminum excess in the reactants.The characterization of infrared emissivity shows that the infrared absorption(in the range of 0.75-2.5 μm) of the obtained hercynite is 0.9,and in the 1-22 μm,8-14 μm and 3-5 μm can reach 0.905,0.938 and 0.870,respectively,which demonstrate the high infrared emission property of hercynite.Additionally,ferrous oxide would promote the infrared absorption in visible/near infrared waveband,and the promotion can be enhanced by increasing the content of Fe O.Conversely,the existence of alumina results in the decreasing of the infrared absorption.
出处
《陶瓷学报》
北大核心
2017年第2期179-183,共5页
Journal of Ceramics
基金
国家自然科学基金资助(51432004
51401225
51372255)
国际科技合作专项(2014DFR51010)
关键词
铁铝尖晶石
燃烧合成
红外发射率
近红外吸收
hercynite
combustion synthesis
infrared emissivity
near-infrared absorption
