Tungsten trioxide, also called tungsten anhydride, which is one of the raw preparation materials of lanthanum tungsten electrode. It is a kind of yellow powder, which is a water-insoluble, alkali-soluble and slightly soluble in acid. It can be used to prepare tungsten alloy and fireproof materials.

Physical properties:
Color: Yellow
Status: powder
Formula: WO₃
Molecular Weight: 231.85
Melting point: 1472 ℃
Boiling point: 1837 ℃
Relative density: 7.16 (water = 1)
Solubility: insoluble in water, slightly soluble in acid, alkali-soluble.
Structure: The structure is determined by the temperature.
When the temperature range is from -50 to -17 ° C, it is triclinic
When the temperature range of 17-330 ° C, it is monoclinic
When the temperature range 330-740 ° C, it is orthorhombic
When the temperature range above 740 ° C, it is tetragonal
Among them, the most common is monoclinic; and its space group is P21 / n.

Chemical properties:
When the temperature is at 850 ℃, it will significantly sublimate;
In addition to hydrofluoric acid, it almost does not react with inorganic acid, and it can be dissolved in ammonia / concentrated alkaline solution (slowly);
It can react with chlorine gas to produce chlorine oxide (heating), but not reacting with bromine and iodine.



 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
 Tel.: 86 592 5129696; Fax: 86 592 5129797
 Email: sales@chinatungsten.com
 Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
 Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
 Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

Set up marketing system to make better use of resources:

According to the national laws and rules, Ganzhou government conformed to the resources and standardized the mining of tungsten by approving the confidential of mineral mining and exploring. In Aug. 2003, as an experiment, Dayu government auctioned 12 tungsten mining licenses in public and made great success. So far, all mining licenses of Ganzhou have been auctioned and atoned beneficially; mining workers were re-employed; the resources were cherished and utilized more efficiently; benefits of enterprises increased obviously. And a developing platform of well-knit basis has formed. Some tungsten metallurgy enterprises had their own mines, which ensured their further development with resources.


Tungsten Powder Manufacturer & Supplier: Chinatungsten Online - www.tungsten-powder.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

Under the same experimental conditions, the application performance comparison of cerium tungsten electrode and tungsten thorium electrode can be seen as follows:

(1) Weld penetration
Cutting the two electrodes having the same diameter, length, and then welding a stainless steel plate (electrode diameter of 4 mm, thickness of 8 mm), after comparison, found that: weld penetration of 2% thorium tungsten electrode is the most shallow, and it is not symmetrical; weld penetration of 4% cerium tungsten electrode is deeper.

(2) The burning rate
Burning rate of cerium tungsten thorium electrode is lower than tungsten thorium electrode, and if the cerium content increases, its performance will be better.

(3) Repeated arc ignition reliability
Experimental materials: electrodes (whose diameter is 3.0 mm)
Experimental procedure: under 200A conditions, positive polarity dimension arc two minutes every two minutes and then arc again, repeating 50 times in a row.
Results: thorium tungsten electrode can not build arc at one time, and its arc dispersion is very irregular and scattered; whereas cerium tungsten electrode can be a trigger to build a stable arc.

(4) Loss ratio
Loss ratio of 2% thorium tungsten electrode is 0.2503 g;
Loss ratio of 4% cerium tungsten electrodes was 0.0655 g.

 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
 Tel.: 86 592 5129696; Fax: 86 592 5129797
 Email: sales@chinatungsten.com
 Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
 Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
 Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

For tungsten carbide, it contains metal binding phase Co, which has low melting point. And Co will easily be plastic deformation and swept by carbide particles under high temperature. This will leave many pits and voids on the surface of nozzle erosion, which makes the hard phase particles broken and eventually fall off due to the loss of support. Therefore, the most common abrasive pattern is grain falling. In addition, pottery has high melting point and its hardness is higher than other carbide particles so that it has good anti-erosion of low angle. However, pottery belongs to fragile material and its bending strength is weaker than tungsten carbide. So when heat stress inside exceed the limits, which it can bear, will crack finally.

Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email:  sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn