Copper Occurrence Use and alloys – Metalurgy

Spread the love

Occurrence of Copper

Ores

i)     Copper pyrite, CuFeS2.

ii)    Cuprite or Ruby copper, Cu2O.

iii)    Copper glance, Cu2S.

The chief ore of copper is copper pyrite. It yields nearly 76% of the world production of copper.

Use of Copper

  • Historically, copper was the first metal to be worked by people. The discovery that it could be hardened with a little tin to form the alloy bronze gave the name to the Bronze Age.
  • Traditionally in old age it has been one of the metals used to make coins, along with silver and gold.
  • Most copper is used in electrical equipment such as wiring and motors. This is because it conducts both heat and electricity very well, and can be drawn into wires.
  • Copper sulfate is used widely as an agricultural poison.
  • Copper alloys used in jewellery: Copper is an easily molded base metal that is often added to precious metals to improve their elasticity, flexibility, hardness, colour, and resistance to corrosion.
  • Medical uses for copper: As the Egyptians documented, copper is known to kill many germs on contact.

Copper Alloys

There are more than 400 copper alloys, each with a unique combination of properties, to suit many applications, high quality requirements, manufacturing processes and environments.

BrassCu 60 – 80%
Zn 40 – 20%
Bronz Cu 60 – 80%
Sn 40 – 20%
Cupper-NickelCopper-nickel alloys have excellent resistance to marine corrosion. The addition of nickel to copper improves strength and corrosion resistance, but good ductility is retained.
GunmetalGun metal, Cu = 85%, Zn = 4%, Sn =8%, Pb =3%
have been used for at least 2,000 years due to their ease of casting, and good strength and corrosion resistance.

Spread the love

Leave a Comment