Nano cesium tungstate is a type of transparent thermal insulation nanopowder, which is not really transparent, but the heat insulation product using it as raw material is of high transparency. Also, such material is environmentally friendly with excellent infrared shielding rate and ultraviolet shielding rate with high visible light transmittance.
And such heat insulation material is more and more widely applied in the field of building. Therefore, researchers are paying more and more attention to the preparation process of nanometer cesium tungstate powder. For example, some experts have proposed to mix the solid phase of tungstic acid and cesium carbonate, then perform heat treatment at a high temperature in a mixed atmosphere of H2 and N2, and then heat-treat at a high temperature in a N2 atmosphere to obtain cesium tungstate powder.
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Although the preparation method mentioned-above is simple in production process and short in flow, the tungsten raw material is hardly soluble in water, so that the tungsten raw material and the cesium raw material are not uniformly distributed uniformly. Therefore, in order to improve the distribution uniformity of the tungsten raw material and the cesium raw material. Some experts have proposed to dissolve ammonium metatungstate and cesium carbonate in water, and then dry, and finally heat-treated in a mixed air (H2 accounted for 10%) atmosphere to obtain cesium tungstate powder.
