2010年8月18日星期三

What is Tungsten Properties ?


Nowadays, tungsten is becoming more and more popular, so people are curious of everything about tungsten. Today we will talk about the tungsten property and it will improve your knowledge.
Tungsten has unique properties that have made it the only material suitable for many applications. Tungsten has unusually high strength at very high temperatures.
Among metals, tungsten has the highest melting point and lowest coefficient of thermal expansion and lowest vapor pressure.
Other tungsten properties include high tensile strength ,high thermal conductivity, high resistance to thermal creep ,high electrical conductivity ,high resistance to corrosion and high modulus of elasticity
Pure tungsten, that is, before alloying with any other material, is steel-gray to tin-white and is a very hard element. Tungsten can be cut with a hacksaw when it is very pure (it is brittle and hard to work when impure) and is otherwise worked by forging, drawing, or extruding. This element has the highest melting point (3422 ¡C) (6192 ¡F), lowest vapor pressure and the highest tensile strength at temperatures above 1650 ¡C (3000 ¡F) of all metals. Its corrosion resistance is excellent and any attack by a mineral acid is virtually imperceptible. Tungsten metal forms a protective oxide when exposed to air but can be oxidized at high temperature. When alloyed in small quantities with steel, it greatly increases its hardness.
Tungsten is: Four times stiffer than steel Six times stiffer than aluminum 100 times stiffer than plastic
Tungsten has the highest melting point and boiling point of all the elements, melting at 3,420 degrees C or 6,700 degrees F, and boiling at 5,700 degrees C and 10,300 degrees F. What this means to the average person is that on the surface of the Sun, Tungsten would become liquid, but if you dropped a piece of Tungsten from outer space, it would enter the Earth’s atmosphere, heat up and glow to red color, and still hit the Earth in a solid piece. And Atomic Symbol is W (Wolfram),Atomic Number is 74,Atomic Mass is 183.85,Melting Point is 3420 C,Boiling Point is 5800 C,Density is 19.25 g/cc,Structure is Body Centered Cubic.
To sum up, because of the tungsten’s durability and extremely resistent,tungsten Carbide has a hardness close to diamond. This makes it a commonly used material for applications requiring high strength and wear resistance.

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