Tungstic acid refers to hydrated forms of tungsten trioxide, WO₃. The simplest form, the monohydrate, is WO₃·H₂O, the dihydrate WO₃·2H₂O is also known. The solid state structure of WO3•H2O consists of layers of octahedrally coordinated WO₅(H₂O) units where 4 vertices are shared. The dihydrate has the same layer structure with the extra H₂O molecule intercalated between the layers. The monohydrate is a yellow solid and insoluble in water. The classical name for this acid is 'acid of wolfram'.

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Tungsten contact features:
Wear resistance;
Arc erosion resistance;
Good melt resistance;
Size deviation: dh ± 0.05mm;
High purity of more than 99.95%;
Hardness is between 71 and 74HRA;
High capability of breaking current;
Density range is 19.1g / cm3 ~ 19.3 g / cm3;
Weld strength can withstand greater than 83MPa;

The number of crystal grains is more than 10,000PCS / mm2;

The carbon content of nail seat base is less than or equal to 0.10% of the low-carbon steel;

The evaporation of the metal surface and less transfer consumption due to electro-thermal effect;

Welding purity of tungsten copper alloy is not less than 99.95%. (product is available according to customer's drawings and size)

 

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The survey results of longitudinal interface of tungsten tube with different processing rate by SEM (Scanning Electron Microscope) show that:

There is no big change between spinning tungsten tube and sintered tungsten compact tissue when processing rate is 12%, that is to say, completely non-deformed tissue still exist in tungsten tube, and its crystal grains show equiaxed grains and sintering hole is circular.

All parts of the spinning tungsten tube are already deformed when processing rate reach 26 %, the grain will somewhat elongated, and sintering hole is oval-shaped.

When processing rate up to 45-68%, spinning tungsten tube is not completely broken, in which can still see the original grain boundaries, and the crystal grain further elongated, the sintering hole is also further stretched.

When the processing rate of spinning tungsten tube rising to 76%, fibrous tissue occurs, the original crystal grains are broken, the original crystal grain boundaries no longer been sawn, sintering holes disappear.

 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
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Tungsten contact, a component which is made of pure tungsten, is used for turning on or breaking the circuit in the switch.

Characteristics of tungsten products: tungsten products have wear resistance; arc erosion resistance; high capability of breaking current; good melt resistance; the evaporation of the metal surface and less transfer consumption due to electro-thermal effect and other characteristics.

Tungsten contact application: tungsten contact is widely used in agriculture, industry, science and technology and defense fields, such as relays, communications machine, Magneto, sirens, cars and motorcycles.

Technological requirements of tungsten contact: With the development of industry, people have also been strict with the process requirements of the tungsten contact. They require tungsten contact rods without cracks, and with smooth surface; good flatness, concentricity and roundness; crystal grains in section is fine and uniform, and its fibers is short.

 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
 Tel.: 86 592 5129696; Fax: 86 592 5129797
 Email: sales@chinatungsten.com
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