GENERAL SCIENCE- CHEMISTRY

 

ALLOYS

                 An alloy is a mixture of metals or a mixture of a metal and another element. Alloys are defined by metallic bonding character. An alloy may be a solid solution of metal elements (a single phase) or a mixture of metallic phases (two or more solutions).

Alloy Composition Uses
Babbitt metal tin: 90% used in bearings because of its low measure of fricti with steel
antimony: 7%
copper: 3%
bell metal copp 77% casting of bells
tin : 23%
brass Cu(60% to 80%), Zn (40 to 20%) inexpensive jewelry; hose nozzles and couplings; piping; stamping dies
bronze copper with up 12% tin coins and medals; heavy gears; tools; electrical hardware
Coin metal copper: 75% U.S. coins
nickel
duralumin aluminum: 95% aircraft, boats, railroad cars, and machinery because of its high strength and resistance to corrosion
copper: 4%
manganese: <1%
magnesium: 0.5%
Monel nickel 60% corrosion-resistant containers
copper: 33%
iron: 7%
Nichrome nickel: 80-85% heating elements in toasters, electric heaters, etc.
chromium: 15-20%
phosphor bronze bronze with a small amount of phosphorus springs electrical springs, boat propellers
solder lead: 50% joining two metals to each other
tin: 50%
sterling silver silver: 92.5% jewellery, art objects
copper: 7.5%
Type metal lead: 75-95% used to make type for printing because it expands as it cools
antimony: 2-18%
tin: trace
German Silver Cu (60%), Zn (25%), Ni (15%) For making utencils
Magnelium Mg (5%), Al (95%) For making aircraft frame
Rolled Gold Cu(90%), Ni (10%) For making cheap ornaments
Gun metal Cu (85%), Zn (10%), Sn(5%) Used for engineering purpose
Steel Fe (98%), C (2%) For making nails, screws, bridges
Stainless Steel Fe (82%) Cr, Ni (18%) for making cooking utencils, knives