99.9% yellow tungsten oxide, or 3N yellow tungsten oxide, is a kind of yellow powder with relative high purity.
Spray Pyrolysis Method to Produce Nano Yellow Tungsten Oxide
By dissolving tungstic acid (H2WO4) in alkali solution containing ammonia under a certain ratio, by ultrasound spray conversion and vacuum drying to get nano YTO powder.
Actually, this method is an aerosol process which belongs to vapor phase method. But it uses liquid phase as precursor. Therefore, it has the advantages of vapor phase method and liquid phase method:
1. The process is simple to obtain product in one step. And it can realize continuing production, which is conductive to be applied in industrial production.
2. Reacting process is completed in a few seconds so that the producing period is short. And the component distribution of obtained product is uniform.
3. Tungstic acid dissolved under liquid phase to ensure that the components are spread evenly. The processing process is simple with little loss. And the stoichiometric ratio can be well calculated to produce composite powder.
4. Yellow tungsten oxide powder is dried from the suspension liquid in the air, the particle is regular ball shape with few agglomerations so that subsequent clean and grinding is unnecessary, but it also assures purity and activity of product.
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