采用液相沉淀法,制备了在片状铝粉表面包覆Cr2O3的复合粉体颜料,利用XRD、SEM、UV/VIS/NIR分光光度计、FTIR红外光谱仪等方法对颜料相结构、形貌、光谱及红外反射特性等进行了测试表征.结果表明,Cr2O3包覆层对光谱反射特性的影响随波长变化而异,波长越短,包覆前后反射率的变化越大.当Cr3+∶Al摩尔比为0.2∶1.0时,Al/Cr2O3复合颜料在可见光波段的反射率下降接近50％,颜色明度参数L*降低15,而8～14 μm波段红外反射率下降不到10％.分析表明,包覆层对不同波长辐射的吸收系数以及表面粗糙度的差异导致了上述结果.该复合颜料对于低明度和光泽度的低红外发射率涂层设计有重要研究价值.
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