As a typical transition metal compound, tungsten oxide is a product composed of tungsten element and oxygen element. It is an important intermediate in the industry of producing elemental tungsten from tungsten ore. The English name is Tungsten Oxide, and the chemical formula is WO3 -x. According to the different oxygen content, it can be divided into yellow tungsten oxide (yellow tungsten), blue tungsten oxide (blue tungsten), purple tungsten oxide (purple tungsten), white tungsten oxide and brown tungsten oxide (brown tungsten). The following mainly introduces the difference between yellow tungsten and blue tungsten.
(1) Definition
Yellow tungsten oxide, also known as tungsten trioxide, referred to as “yellow tungsten”, is a compound composed of 1 tungsten atom and 3 oxygen atoms. The English name is Tungsten Trioxide or Yellow Tungsten Oxide (abbreviated as YTO). For WO3, the valence of tungsten is +6.
Blue tungsten oxide, also known as tungsten blue oxide, referred to as “blue tungsten”, is an inorganic compound composed of 20 tungsten atoms and 58 oxygen atoms. Its English name is Blue Tungsten Oxide (abbreviated as BTO), and its chemical formula is WO2.90 or W20O58, the valence of tungsten is +5 and +6. Note: Since the blue tungsten lattice contains a certain amount of oxygen vacancies, it is also an oxygen-deficient/oxygen-vacancy tungsten oxide; blue tungsten oxide is not a compound with a single chemical composition, but is composed of ammonium tungsten bronze, hydrogen tungsten A mixture of bronze, beta-tungsten oxide, and gamma-tungsten oxide.
(2) Microstructure
The appearance and morphology of yellow tungsten and blue tungsten are not much different, both of which maintain the appearance of ammonium paratungstate, and the particles have sharp edges and corners. However, the particle size of yellow tungsten is larger than that of blue tungsten.
(3) Physical and chemical aspects
The same point: Both yellow tungsten and blue tungsten have the basic properties of ordinary tungsten oxide, such as powder, odorless, insoluble in water, easy to sublime, strong oxidation, good chemical stability, photochromic, electrochromic and aerochromic properties.
The difference: the color of yellow tungsten powder is yellow or green, the measured density is 7.21-7.30 g/cm3, and the measured density by X-ray is 7.27 g/cm3; the color of blue tungsten powder is blue or dark blue, the measured density is 7.15 g/cm3, and the measured density by X-ray The measured density is 7.16 g/cm3, which has certain reducibility.
(4) Production technology
The preparation methods of yellow tungsten and blue tungsten are the same, including APT (ammonium paratungstate) hydrogen reduction method and direct synthesis method, but the process parameters of the two are slightly different in the production process, such as the concentration of reducing gas is higher in the production of blue tungsten. In addition, the production of blue tungsten can also use yellow tungsten as raw material.
(5) Purpose
Both yellow tungsten and blue tungsten can be used to produce tungsten dioxide, metal tungsten powder, tungsten carbide powder and tungstate, so as to prepare high specific gravity alloy and hard alloy, and can also be used as gas sensor material and thermal insulation coating material wait. Note: Blue tungsten can be used as an oxygen scavenger for vacuum equipment due to its strong oxygen absorption capacity.
More details of tungsten oxide product, please visit website: tungsten-oxide.com
Please contact CHINATUNGSTEN for inquiry and order of tungsten oxide:
Email: sales@chinatungsten.com
Tel.: 86 592 5129595
