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Tungsten was discovered in 1781 by Swedish chemist Carl Wilhelm Scheele. Tungsten has the highest melting point of all metals, at 3,410 °C (6,170 °F). Filament of a 200 watt incandescent lightbulb highly magnified. Up to 22% Rhenium is alloyed with tungsten to improve its high temperature strength and corrosion resistance.
Tungsten has the lowest coefficient of thermal expansion of any pure metal. The low thermal expansion and high melting point and tensile strength of tungsten originate from strong covalent bonds formed between tungsten atoms by the 5d electrons. [28] Alloying small quantities of tungsten with steel greatly increases its toughness. [17]
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rWNiCo: tungsten (91–93%), nickel (3–5%) and cobalt (2–4%) rWNiFe: tungsten (91–93%), nickel (3–5%) and iron (2–4%) Upon detonation of the explosive, the casing disintegrates into extremely small particles, as opposed to larger pieces of shrapnel which results from the fragmentation of a metal shell casing. The HMTA powder acts like ...
Chain mail (also known as chain-mail, mail or maille) [1] is a type of armour consisting of small metal rings linked together in a pattern to form a mesh. It was in common military use between the 3rd century BC and the 16th century AD in Europe, while it continued to be used in Asia, Africa, and the Middle East as late as the 17th century.
Small metal beads called sizing beads can be added to the inner circumference of a ring to: Decrease the effective inner diameter of a ring that is too big, to aid in holding the ring in place against the finger; Counterbalance top-heavy rings; Keep a ring from spinning for wearers whose knuckles are much larger than their finger base [18]