Tungsten has high melting point. At the melting point temperature, many metals have evaporated, so the metals that can form alloy with tungsten are limited. There’re mainly cobalt, nickel, molybdenum and aluminum, etc, that can form alloy with tungsten.

Main tungsten applications in alloys are as follows:

 

1. Characteristic alloys: a general term for a special nickel base, cobalt base and iron based alloy for over heat, wear and corrosion resistance. They include superalloys, corrosion resistant alloys and wear resistant alloys. Superalloys are used in petroleum processing plants.

 

 

2. Welding and surface hardening alloys: a variety of welding technologies are used to deposit a layer of cemented carbide on the surface of metal parts, so as to improve the wear resistance of the components. They’re mainly used for lining the mill and crusher, and drilling machines in mining.

 

3. Tungsten cobalt alloy: it has age hardening, which can be used in the manufacture of heat tungsten mold, usually 20% of tungsten. Though the hardness is not as high as steel, but it has better effects than high-speed steel (tungsten alloy with higher hardness is more likely to crack).

 

4. Tungsten lead alloy: tungsten lead alloy is made by pressing the mixed metal powder into the mold by external force in a reducing atmosphere. These alloys are of high hardness and density and can be used in the manufacture of small arms ammunition.

 

5. Heavy alloys of tungsten: heavy alloys usually contain more than 90% tungsten. The margin is copper and nickel. Such alloys were originally used as protective covers for laser radiation therapy and are now shielded by X rays and gamma rays. Heavy alloys are used as dynamic and static balancing blocks for aircraft, guided systems, rotors, rotors, adjusters, and balances for aircraft wings, and radar antennas, etc.

 

6. Tungsten molybdenum alloy: tungsten and molybdenum can form continuous solid solution. The melting point of tungsten can be reduced by adding molybdenum. The higher the content of molybdenum, the lower the melting point of the alloy. This kind of alloys can be used as the heater of thermionic cathode and thermocouple.