Tungsten oxide is an oxide of tungsten. According to the different oxygen content in W-O system, tungsten oxide can be divided into yellow tungsten oxide, yellow tungsten oxide sometimes appears as light green tungsten oxide; blue tungsten oxide, purple (pink) Oxides, brown (brown), and the intermediates of some oxides will also appear black, which is called black tungsten oxide. Tungsten oxides with different colors have different physical and chemical properties, appearance and uses.
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
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
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.
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