Tungstic acid is obtained by the action of strong acids on solutions of alkali metallic tungstates. It may also be prepared from the reaction between hydrogen carbonate and sodium tungstate.

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1、For the mordant, analytical reagents, catalysts, water treatment chemicals, manufacturing fireproof, waterproof material, and phosphorus tungstate, tungsten, boron salts.
2、For the manufacture of tungsten, tungsten acid, tungstate,etc.
3、For the mordant, pigments, dyes, inks.
4、As a weighting agent for fabric by weavers. This product is used as textile assistants. And a mixture of tungsten acid, ammonium sulfate, ammonium phosphate and other components used in fiber fire and water. This kind of fibers can be made into fireproof rayon and rayon. It can also be used in tanning leather.
5、As anti-corrosion coating for electroplating.
6、As a co-solvent playing a role in reducing firing temperature and complementary color when introducing enamel pigment.
7、For petroleum and aerospace manufacturing industry, aerospace materials.
 

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A rocket engine requires one or more current carrying loops surrounding the reaction region to produce the magnetic field that deflects the plasma and charged radiation from the drive pulses. Typically, these loops are made of superconductors, since any normal conductor would quickly melt or vaporize under the high currents needed to produce the field. The field coils are backed by a high tensile strength support to withstand the magnet-current back reaction from bursting the superconductor.

These field coils must be protected from the intense neutral radiation that the drive pulses produce. This is because a superconductor that becomes too hot will cease to superconduct. A common shielding design is a sheet of tungsten with a "V"-shaped cross section at a very narrow opening angle, resembling a knife-edge. The point of the V faces the radiation source, the field coil runs along the open top of the V. At very small angles of incidence, tungsten makes a good reflector of x-rays so that most x-rays are simply reflected at low angles away from the field coils and into space. Since tungsten atoms are much heavier than neutrons, a collision between a tungsten nucleus and a neutron results in the neutron rebounding with most of its original energy, delivering only 1% of its energy on average to the tungsten shield. This scatters the neutrons away from the field coils. The narrow opening angle means that the tungsten knife edge is essentially a sheet perpendicular to the incoming radiation, allowing a large radiator area compared to the cross section exposed to the radiation.

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Government regulations on lead and other hazardous substances in various electronic and electrical equipment are forcing medical device OEMs and others to find suitable substitutes for parts that have been manufactured from lead and other restricted materials, with plastics coming to the rescue.

A material has been found, that alternative to those being restricted by government regulations: poly-tungsten thermoplastic. This material can be machined and fabricated in a variety of configurations, and has the density of traditional metals without the safety issues associated with lead. Poly-tungsten is more durable than other lead substitutes and offers equal or better radiation-shielding capabilities in electronic and electrical products. Because it is malleable, poly-tungsten offers increased design flexibility and the opportunity to create molded parts in lieu of multi-part assemblies.

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Names

IUPAC name   dihydroxy-dioxotungsten

Other names   Orthotungstic acid

CAS Registry Number   7783-03-1

Properties

Chemical formula   H2WO4

Molar mass    249.853 g/mol

Appearance    yellow powder

Density   5.59 g/cm3

Melting point        100 °C (212 °F; 373 K) (decomposes)

Boiling point 1,473 °C (2,683 °F; 1,746 K)

Solubility in water        insoluble

Solubility      soluble in HF, ammonia

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

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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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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.

 

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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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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.

 

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Currently in four common refractory metals for tungsten tube process, tungsten, molybdenum, tantalum, niobium, in which tungsten tube is the one whose processing is with maximum difficulty, because it has a higher brittle transition temperature, larger deformation tension, greater difficulty of machining and so on.

Powder metallurgy for seamless tungsten tube by spinning process as follows:

Loading powder → isostatic pressing (pressure is controlled at about 196MPa) → finishing the outer surface of tungsten tube→ hydrogen sintering (temperature is controlled at 2350-2400 ℃ around, heat preservation time for the 5-6h) → spinning --- general tungsten tube → grinding ---tungsten tube with thin wall and high precision.

Spinning: In the heat roller wheel spinning machines, heating tungsten tube using the flame mixed with hydrogen and compressed air and spinning, temperature is 1000 ℃ around.

Avoiding the tungsten tube will crack in spinning process, usually annealing is adopted (through hydrogen; temperature controlling: 1000-1100 ℃; insulation 1h), to increase the plasticity of tungsten tube.

 

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