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TUNGSTEN HEAVY ALLOYS 

Tungsten heavy alloys illustrate the advantages of microencapsulated powders. A brief background of this alloy system follows.

Tungsten heavy alloys generally are two-phase composites consisting of W-Ni- Fe or W-Ni- Cu or even W-Ni-Cu-Fe. Tungsten content in conventional heavy alloys varies from 90 to 98 weight percent and is the reason for their high density (between 17 and 18.6 g/cc). Nickel, iron and copper serve as a binder matrix, which holds the brittle tungsten grains together and which makes the alloys ductile and easy to machine. Nickel-iron is the most popular additive, in a ratio of 7Ni:3Fe or 8Ni:2Fe (weight ratio). The conventional processing route for tungsten heavy alloys includes mixing the desired amount of elemental powders, followed by cold pressing and liquid phase sintering to almost full density. The matrix alloy melts and takes some tungsten into solution during liquid phase processing, resulting in a microstructure through which large tungsten grains (20–60um) are dispersed in the matrix alloy. The as-sintered material often is subjected to thermo mechanical processing by swaging and aging, which results in increased strength and hardness in the heavy alloys.

Conventional heavy tungsten alloys exhibit a unique property combination. Properly processed materials show a combination of high density, high strength, high ductility, good corrosion resistance, high radiation adsorption capability, and reasonably high toughness. This property combination has made this alloy a candidate for defense and civilian applications. Some of these applications include X-ray and γ-radiation shields, counter weights, defense purposes of kinetic energy penetrators, vibration dampening devices, medical devices for radioactive isotope containment, heavy-duty electrical contact materials, balancing crankshafts for racing car engines, and gyroscopes.

The Brief Introduction of Tungsten Alloy Products of CTOMS

With more than 10 years’ successful experience, CTOMS has become a leading W/Mo e-commercial company, as a professional manufacturer, marketer and exporter in supply of standard and non-standard products and services to hundreds of clients worldwide. You can find more wherefrom.

The major products and services of CTOMS

1.Tungsten intermediate/final/RPP

--APT, AMT, Tungstic Acid, BTO, YTO, W/WC powder

--Ready to press powder for sintered carbides and heavy alloys

2.Pure/K-doped W/Mo

--Pure tungsten/K-doped tungsten wire, filament for lighting;

--Tungsten (stranded) wire & heater for evaporation coating;

--Tungsten target, tungsten rivet contact, tungsten needle;

--Pure molybdenum rod, wire, sheet, plate, support;

--Tungsten/moly plate, sheet, bar, boat, crucible;

--Tungsten/ W-TH and other electrodes for welding;

3.Tungsten Carbides

--Tungsten carbide for cutting, drilling and wearing in forms of rod, bar, drawing dies, seals, blade, insert, button;

4.Tungsten Heavy Alloys (WHA)

--Tungsten heavy rod, bar, cube, brick, block, plate for various applications

--Tungsten billet/barrel as main body of professional darts,

--Screws/heads for golf club, flying fish sinker

--Counterweight used in yacht, sailboat, submarine and other vessels

--Ballast for aircraft, helicopter, F1 racing cars and other vehicles

--Kinetic energy penetrators for defeating heavy armor

--Governor balance weight

--Cubes/balls for bullet, rifle, missile and bomb

--Radiation shield for nuclear U-power, X-ray, medical instruments parts etc.

--Mobile phone bobs/vibrators

--Tungsten-thoria guide nozzles

 5.Technologies/Engineering

--Design and machining

--Professional inspection and technical data available

6. E-commerce

--E-news agent of China Tungsten Industry Association (CTIA)