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copper alloy and their application .pdf


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Copper Alloy and Their Application
Copper is easily alloyed with other metals. It is generally divided into red copper, bronze, brass and
cupronickel.
Red Copper
Pure copper is in red color, but not all red copper is pure
copper, because sometimes people will add some
deoxygenation elements.or other elements to improve its
quality and function. Its copper content is over 99%, melting
point is 1083 ℃ and density is 8.9 g/cm³.
It is of high ductility, malleability, thermal and electrical
conductivity. However, the light impurities has great effect
on thermal and electrical conductivity. Therefore, every year,
half amount of red copper will be refined to be pure copper, then used in electrical industry. After these
copper wire can’t be used anymore, they are still of high recycling value. Copper cable
granulator and wire stripping machines are two popular choices in copper recycling. Red copper is also
of good resistance to corrosion in air, sea water, non-oxidative acid, soda, saline solution and multiple
organic acid, therefore it is widely used in chemical industry.
Bronze
Generally speaking, bronze is an alloy of
copper and tin. The content of tin is usually
above 3%. Compared with red copper, bronze
is of high intensity, low melting point, good
castability, anti-friction and bright color . It is
also harder than iron and pure copper,
therefore it is very suitable for casting various
utensils, machinery parts, bearing, gear, etc.
Bronze is the earliest copper alloy used in
history. And from early days, people have
known different percentage of copper, tin or
other elements like zinc and manganese will meet different purpose. For example, bronze chime has
relatively high tin content, thus making a sonorous sound when it is struck. Zinc can improve hardness,
so bearing usually contain a spot of zinc.

Brass
Brass consist of copper and zinc. It is usually
used in manufacturing valve, water pipe,
internal and external connecting pipe of air
conditioner, radiator, etc. Brass can be
generally divided into common brass and
special brass. Common brass is the alloy of
copper and zinc, which has been mentioned
above. The content of zinc in brass changes
greatly, which lead to the diversification of its
tissue at room temperature.,thus causing different function. Special brass is adding some other elements
into the common brass. The often-added elements are lead, tin, aluminum,manganese, etc. The purpose
of this way is for improving tensile strength and weldability.
More to Read at http://www.copper-wire-recycling.com/news/copper_wire/Uses-of-copper-alloy.html


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