Tungsten heavy metal

WNi6,5Fe3,5 1000 times magnification DIC
Taken at the Institute for Materials Science and Applied Mathematics at the TH Cologne

WNi6,5Fe3,5 1000 times magnification SEM
Taken at the Institute for Materials Science and Applied Mathematics at the TH Cologne

As tungsten -Schwermetall (WSM) are powder-metallurgically tungsten produced alloys referred to. The alloying elements nickel - iron or, for non-magnetic applications, nickel- copper serve as the matrix for the tungsten particles .

Overview

Tungsten heavy metals are defined in the material standard ASTM B777-07. They are divided into 4 classes (Class 1-4) according to their tungsten content between 90 and 97 percent by mass. The density is between 16.85 g / cm³ and 18.85 g / cm³. Tungsten heavy metals are characterized by their good machinability , good temperature resistance, high strength and high density. Tungsten heavy metals are not used as construction material due to their poor weldability , despite their good mechanical properties (tensile strength between 700 and 1400 Mpa).

use

Tungsten heavy metals are used according to their properties.

High density:

• Ballistic projectiles (military, darts, archery)
• Weights in sports (Formula 1, sailing, fishing,)
• Balance weights ( crankshafts , turbines , rotors )
• Anti-vibration boring bars
• Tool holder
• Vibration imbalances (cell phone, electric toothbrush)
• Rotors for winding automatic movements

Radiation absorption:

• Shielding from gamma and x-rays
• As collimators

Temperature resistance:

• Mold inserts and ejectors in die-cast aluminum / magnesium .
• Electrical discharge machining

Web links

• http://www.whs-sondermetalle.de/Wolfram_Schwermetall.html
• https://www.kennametal.com/en/products/engineered-wear-solutions/densalloy-tungsten-heavy-alloy/tungsten-heavy-alloys.html

Individual evidence

1. ↑ ^{a b} Archive link ( Memento of the original dated November 8, 2016 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. (July 13th, 2017, 6:03 am)  
2. ↑ ^{a b} Archive link ( Memento of the original from June 22, 2017 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. (July 13th, 2017, 6:05 am)