Tungsten oxide is a kind of tungsten oxide of tungsten. According to the different oxygen content in W-O system, tungsten oxide can be divided into (1) yellow tungsten oxide, yellow tungsten oxide sometimes appears as light (2) green tungsten oxide, ( 3) Blue tungsten oxide, (4) purple tungsten oxide, the appearance of purple tungsten oxide is also pink, so it is sometimes called (5) pink tungsten oxide, (6) brown tungsten oxide, also known as (7) brown oxide Tungsten, some intermediates in the reproduction process of tungsten oxide will appear black, also known as (8) black tungsten oxide. Basically, tungsten oxides with different colors have different appearance colors due to their different physical and chemical properties, so the manufacturing process, subsequent processing products and uses are also different; some tungsten oxides are caused by the color difference of the appearance color. The above is a 6 product, so the physical and chemical properties and uses are the same, such as what we call yellow tungsten oxide and green tungsten oxide, purple tungsten oxide and pink tungsten oxide. This classification is summarized by Chinatungsten Online based on its own experience, and may not fully comply with academic logic and industry norms and standards, and is for your reference only. In the production process of the tungsten products industry, yellow tungsten and blue tungsten are the more common tungsten oxides. CTIA GROUP LTD is better at processing and producing purple tungsten and cesium tungsten, especially nano-violet tungsten and cesium tungsten bronze.
Yellow tungsten oxide (YTO)
Tungsten trioxide is a finely divided yellow crystalline powder, also known as yellow tungsten oxide, English is Yellow Tungsten Oxide (YTO), the chemical formula is WO3, the most common and mass-produced chemical compound of tungsten in tungsten oxide in Huangtungsten City Products, normal yellow tungsten is yellow when the crystal size is about 1.5um, and green when the crystal size is about 15um. Therefore, the tungsten oxide at this time can also be called green tungsten oxide.
Blue Tungsten Oxide (BTO)
Blue tungsten oxide refers to a kind of dark blue compound containing tungsten (Ⅵ) and tungsten (V) mixed valence state, English name is Blue Tungsten Oxide (BTO), chemical formula WO2.9, it will turn into light blue under light , and if it is repacked in a black opaque bag, it will return to its original color. Note: Tungsten blue is different from blue tungsten oxide.
Violet Tungsten Oxide (VTO)
Violet tungsten oxide is a kind of tungsten oxide. It is a purple finely divided crystal powder. The English name is Violet Tungsten Oxide (VTO), and its chemical formula is WO2.72. It is a better raw material for the production of ultrafine tungsten powder and tungsten carbide powder. Different from other tungsten oxides, purple tungsten oxide has a unique crystal structure, and each particle is a loose particle group composed of needle-shaped or rod-shaped grains, and there are abundant cracks inside the group, which makes it have larger voids , smaller bulk density, favorable for the infiltration of hydrogen and the escape of water vapor during the reduction process.
Brown Tungsten Oxide
Tungsten dioxide, also known as brown tungsten oxide, is brown monoclinic powder crystal, Tungsten(IV)Oxide in English, chemical formula is WO2, density is 10.9~11.1g/cm3, boiling point is about 1700℃, heat of formation 134 kcal/mol, volatile at 1050°C, insoluble in water, alkaline solution, hydrochloric acid and dilute sulfuric acid, but soluble in concentrated H2SO4, forming red salt, easily oxidized by nitric acid into high-valent tungsten oxide.
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