Views: 2 Author: Site Editor Publish Time: 2021-12-29 Origin: Site
Tungsten alloys, sometimes referred to as heavy alloys, are usually 90-97% tungsten with the rest of its composition being a matrix of metals which improve the ductility and machinability of the resulting alloy. The common materials is tungsten nickel iron and tungsten nickel copper.
The most common of the tungsten alloys, tungsten nickel iron alloys are top of the list in terms of ductility, strength, and density. They are a silvery-grey color, have a range of densities from 16.85-19.3 g/cm3, and are also known as WNiFe. These metals have tensile strengths ranging from 600-1000 MPa, which surpasses most if not all other alloys. These alloys have good machining qualities and plasticity and can withstand intense temperatures, while still having a thermal conductivity that is 5 times that of die & punch steels. They have 1.7 times the radiation shielding capabilities of lead and are non-toxic to biological systems (which cannot be said for lead). Iron makes these alloys magnetic, which is important to know if they are planned to be used in any magnetism-sensitive operations such as medical imaging equipment. Tungsten nickel iron alloys have a low expansion coefficient useful for glass-to-metal seals and possess high moduli of elasticity, which makes them resistant to elastic deformation. These alloys are perfect for radiation shielding, as its high density matched with its radiation resistance are ideal for protective components. Some notable applications include balance weights, security and defense applications, ballasts, bearing assemblies, and more.
The non-magnetic cousin to tungsten nickel iron alloys is the tungsten nickel copper alloys. They are about as popular as nickel-iron alloys, but generally, have lower tensile strength (500-700 MPa) and ductility. They are great electrical conductors and are easy to machine despite their high mechanical strength. They possess excellent thermal stability and can shield from radiation about as well as other tungsten alloys. The greatest advantage to tungsten nickel copper alloys is their non-magnetic nature; this feature allows them to be used in applications where tungsten nickel iron alloys would be magnetically disruptive. They are widely specified in oncology tools, electrical sensor shields, guidance system components, and military technology.
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