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TUNGSTEN

WCost = $3.13 for 1 gram

Ben EscotoKimball71243

In a life without this, light is hard to catch. It may be better

just to light a match

Facts

Protons: Neutrons: Electrons: Melting point : Boiling point: Density:

7411074

3422°C5555°C

19.3g/cm³

Transition Metal

solid

Discovered in in 1783 by Fausto and Juan Jose de Elhuyar,Its name derived from the Swedish words tungs ten meaning heavy stone.Its atomic symbol (W) derived from wolfram its German name

Production Tungsten reserves are found in China, Canada

and Russia. Since tungsten has high melting point it cannot be refined from smelting. So once the ore of the minerals are crushed they are sent through a series of chemical reactions, precipitations, and washings to obtain ammonium paratungstate (APT). Then it is sold or to be further processed to obtain tungsten oxide. The tungsten oxide can then be roasted in a hydrogen

Tungsten is mostly retrieved from the mineral ore wolframite (Iron Manganese Tungstate) (Fe, Mn) WO4

Also retrieved from mineral scheelite(Calcium Tungstate) CaWO4

atmosphere to create pure tungsten powder to be the starting point for mill products, tools, wire and other various products.

The light bulbThe filament in light bulbs are made from tightly coiled lengths of tungsten wire. Electricity is ran through the coiled tungsten vibrating the electrons which forms light. Tungsten is used because of its high melting temperature.

The tungsten filaments are heated to around 2200°C. So to keep it from combusting the sealed bulb is usually filled with argon

Argon is used because combustion requires a heated material and oxygen. Argon will not react because it is an inert gas.

GTAW

corrosion. Tungsten is a good conductor of heat, this property is what allows the tungsten electrode to withstand the arc temperature well above its melting point. But because of the intense heat some erosion of the electrode will occur, transferring tungsten across the arc to the work.

Gas Tungsten Arc Welding or TIG (tungsten inert gas welding) process was invented in the late 1930’s early 1940’s. A process that welds exotic metals uses electricity to produce heat. To use this process, an arc of 6000°C is established and carried by a tungsten electrode to the work and is shielded by mixtures of inert gasses to protect from

Tungsten electrode

Tungsten electrode

Tungsten Carbide

W(s) +C(graphite)=WC(s) ∆H=-40.5KJ

Tungsten carbide (WC, W2C) is one of the most known chemical compounds containing tungsten. The solid is a class of inorganic compounds of carbon, used alone or with 6 to 20 percent of other metals to increase hardness of cast iron, useful in the manufacturing of cutting tools such as edges of saws and drills also as penetrating cores of armour-piercing projectiles. A dense metal that doesn’t melt but decomposes with a high melting point of around 2,600°C. because it is made of both Tungsten and carbon, the empathy for the reaction occurs at 1,400°C . So the combustion of the elements are measured by using Hess’s Law

2W(s)+3O(g)=2WO3(s); ∆H=-1685.8KJC(graphite)+O2(g)=CO2(G); ∆H=-393.5KJ2WC(s)+5O2(g)=2WO3(s)+2CO2(G); ∆H=-2391.8KJ

W(s)+3/2O(g)=WO3(s); ∆H=-842.9KJC(graphite)+O2(g)=CO2(G); ∆H=-393.5KJWO3(s)+CO2(G)=WC(s)+5/2O2(g); ∆H=1195.9KJ

× ½

× -½

TungstenWThis Heavy Metal

doesn’t heat up under pressure

74 183.84

Ben EscotoKimball71243