为了研究制备复合隐身粒子的方法,采用溶胶-凝胶法制备了核-壳结构SiO_2@Bi_2O_3粒子.通过XRD、TEM及发射率测试仪对制备的材料的结构、形貌和性能进行了表征.XRD表明在700℃可以得到Bi_2O_3纯相;红外发射率测试表明,Bi_2O_3具有较低的红外发射率,在SiO_2表面包覆Bi_2O_3后,在3～5 μm和8～14 μm两个测试波段都能降低SiO_2的红外发射率.通过核-壳结构的形式,在较高发射率的样品表面涂覆红外发射率较低的样品,可以提高红外隐身效果.
In order to provide a method for developing composite stealth particles, SiO_2 @ Bi_2O_3 particles with spherical core-shell structure were prepared by sol-gel method. The structure, morphology and emissivity of the particles were characterized by XRD, TEM and infrared emissometer. XRD measurement indicates that the pure phase of Bi_2O_3can be obtained at 700 ℃. TEM validates the formation of core-shell structure of SiO_2@Bi_2O_3 spheres. The IR emissivity measurements indicate that the high emissivity of SiO_2 in the ranges of 3 ～5 μm and 8 ～ 14 μm can be lowered by coating a thin layer of Bi_2O_3 on the surface of SiO_2 spheres. There-fore, the as-synthesized core-shell structured SiO_2@ Bi_2O_3 spheres can improve the IR shielding property.
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