以硝酸铁和硝酸钴为原料,柠檬酸为络合剂,采用溶胶-凝胶法合成具有高红外辐射性能的钴铁氧体,并考察初始混合溶液pH (pH=1、3、5、7)对CoFe2O4红外辐射性能的影响.利用FTIR、TG/DSC、XRD、SEM、BET和红外发射率测试等对CoFe2O4的形成过程、结构、形貌以及红外辐射性能进行表征.结果表明:不同pH的初始混合溶液所得干凝胶均具有自蔓延燃烧特性,经600℃煅烧后得到无杂质的尖晶石型CoFe2O4粉体.研究发现,初始混合溶液的最佳pH为5,此时样品8～14 μm波段的红外发射率最高(0.92),形成以介孔为主的孔结构,比表面积为65.44 m2/g.
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