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Nano violet tungsten oxide may be prepared by using ammonium paratungstate 5(NH4)2O?12WO3?5H2O as raw material. 1. Ammonium paratungstate heated above 400°C, the reaction in formula (1) occurs: 5(NH4)2O?12WO3?5H2O=12WO3+10NH3+10H2O (1) The reaction product NH3 in the formula (1) or NH3 introduced in other ways reacts in the formula (2) under the catalytic action of tungsten oxide WOx (2≤x≤3) to generate reducing gas hydrogen H2. 2NH3=N2+3H2 (2) 2. When the reaction temperature rises above 500°C, the reaction product WO3 in formula (1)…

Grade 1 violet tungsten oxide is classified according to national standard with grade of WO2.72-1. Certainly, there are different grades of violet tungsten oxide in line with different classification criteria. Moreover, during the actual production process, manufacturers may adopt different raw materials, processing equipment, and processing technology so that they may produce a variety of violet tungsten oxide with different specifications. In accordance with national standard, the component of grade 1 violet tungsten oxide should satisfy the following requirements: More…

Super grade violet tungsten oxide is a type of violet tungsten oxide classified in accordance with national standard with grade of WO2.72-0. The other type of violet tungsten oxide is grade 1 violet tungsten oxide. However, in fact, different manufacturers are producing a variety of violet tungsten oxide with different specifications. That is because raw materials, processing equipment and processing technology adopted by the manufacturers may vary during the actual production process. According to national standards, the component of super…

High-purity high density violet tungsten oxide’s color can reflect its quality. Moreover, the color of violet tungsten oxide is related to its oxygen index, tightness of particles and aspect ratio of needle. The purple-colored violet tungsten oxide has a slightly higher oxygen index, slightly thinner and longer needles; And the mauve-colored violet tungsten has slightly coarser and shorter needles. The quality of violet tungsten oxide can be determined by colorimetry. This method is more intuitive and effective, which saves time…

Coarse grain size violet tungsten oxide is insoluble in water, so its solubility in water is almost zero. Violet tungsten oxide is also insoluble in ethanol. However, it is soluble in alkali liquor as tungsten oxides are all acidic oxides. What is solubility? Solubility refers to the mass of solutes dissolved in a 100g solvent to a saturated state at a certain temperature. The solubility of a substance fundamentally depends on the physical and chemical properties of the solute and…

Fine grain size violet tungsten oxide can be used to produce ultrafine tungsten powder (W powder) and ultrafine tungsten carbide powder (WC powder). Ultrafine W powder and WC powder prepared by using fine violet tungsten oxide as raw material have better performance. The phase composition of the violet tungsten oxide has a great influence on the properties of the prepared W powder and WC powder. In addition, the content of NH3 in violet tungsten oxide can also greatly affect the…

Nano-needle violet tungsten oxide has a diameter of 20-200nm, a length of 0.5-10μm, and a length-diameter ratio of 5-300. This type of violet tungsten oxide may be synthesized in one step by a solution process. Therefore, the reaction time is short, and the reaction initiation temperature is low. A large quantity of gases are produced in the reaction course, and sufficient contact with air is impeded, so that the generated product, namely, the violet tungsten oxide, is relatively single, favorable…

Violet tungsten oxide nanopowder, compared with blue tungsten oxide nanopowder, is more suitable for the preparation of nano tungsten powder (W powder) and nano tungsten carbide powder (WC powder). That is because the grain size of WC powder prepared by using violet tungsten oxide as raw material is finer although the agglomeration (only weaker agglomeration, which can be eliminated by some means) is more serious. Weaker agglomeration is mainly caused by Van der Waals force and Coulomb forces between particles…

Nano grain size violet tungsten oxide may be produced by APT mild reduction method. The nano violet tungsten oxide prepared by this method has the following advantages: 1. High purity, high crystallinity, and stable thermal performance; 2. Loose powder structure; The shape of grain is mostly spherical and the particle size distribution is even; 3. Large surface area, single pore structure, average particle size up to 26.1 nm, which provides a good prerequisite for the preparation of high-quality tungsten carbide…

High-purity ultrafine violet tungsten oxide, as a new material, is finding wider and wider applications in recent years. Under the same hydrogen reduction process conditions, the grain size of tungsten powder (W powder) prepared by using violet tungsten oxide (VTO) as raw material is finer than that of using blue tungsten oxide (BTO). Therefore, manufacturers who produce ultrafine grain size tungsten carbide powder by using ultrafine tungsten powder as raw material are paying more and more attention to process improvement…