Tungsten Oxide Physical and Chemical Property
Tungsten oxide is a kind of tungsten acid anhydride, which belongs to the product of tungsten.
According to the difference of oxide volume, tungsten oxide can be divided into four categories : WO3£¨yellow tungsten oxide£©,WO2.9£¨blue tungsten oxide£©,WO2.72£¨violet tungsten oxide£©,WO2£¨brown tungsten oxide£©.
Physical property:
Molecular formula: WO3
Melting point: 1473¡æ
Boiling point: 1837¡æ
Appearance: light yellow powder
Density: 7.16g/cm3
Solubility in H2O: insoluble
Odor: odorless
Specific gravity: 7.16g/cc
Structure: the crystal structure of tungsten oxide is depended on temperature. It is tetragonal when the temperatures reach above 740¡ãC. It becomes triclinic from -50 to 17¡ãC, monoclinic from 17 to 330¡ãC and orthorhombic from 330 to 740¡ãC. The monoclinic with space group P21/n is the most common structure of WO3.
Chemical property:
Tungsten oxide can slowly soluble in strong alkali solution, but insoluble in water and acid (except hydrofluoric acid).
The color of tungsten oxide becomes dark when it is heating.
Tungsten oxide is widely used in different fields from our daily life to industrial production.
Application:
1. WO3 is one of the most important, highly pure intermediates for the production of other tungsten compounds including tungsten metal powder.
2. Because of its bright yellow color, it is used as a pigment in oil and water colors.
3. It is employed in a wide variety of catalysts, most recently for the control of air pollution and industrial hygiene.
4. Manufacturing cemented carbides, such as tungsten cooper, tungsten nickel, tungsten silver, tungsten rhenium , tungsten filament.
5. Can be used as ceramics stains and analytical reagent analytical reagent.
6. Employ in X-ray screen and fireproof fabric.
7. In shipbuilding industry, tungsten oxide is used as a important anti-corrosion paint and coating materials.
Attentions:
1. People who usually contact with tungsten compound are easy to get the respiratory disease, suffer from bronchial asthma, gastrointestinal dysfunction, and also appear small nodules and scales on the skin. In the United States, the maximum allowable concentration of tungsten and soluble tungsten compound is 1 mg/m3, and the insoluble tungsten compound is 5 mg/m3. The operator should wear protective products such as gas masks, gloves, glasses, and dust jacket.
2. To prevent dust leakage when operate the machine.
3. People who work in this industry should do some physical examination and regular inspection.
4. Fire fighting methods: fire fighters should wear full body fire protective clothing to put out fire in the upper hand. And the containers should move in open space as far as possible. Then according to the reason of the fire, choose the appropriate fire to extinguish fire.
5. Emergency measures: when the skin contacts WO3, we should remove contaminated clothing, and wash with plenty of water flow. When the eye contacts WO3, we should flush with flowing water or saline. When inhales the gas, we should quickly remove to the fresh air to maintain airway patency. When intake mistakenly, we should drink plenty of warm water, vomit timely and receive medical treatment.
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