MATERIALS. CERAMICS HAVE A LONG HISTORY CONTAIN OXIDES (EX. SiO 2 ) CERAMICS: A solid material...
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Transcript of MATERIALS. CERAMICS HAVE A LONG HISTORY CONTAIN OXIDES (EX. SiO 2 ) CERAMICS: A solid material...
MATERIALS
CERAMICS HAVE A LONG HISTORY
CONTAIN OXIDES (EX. SiO2)
CERAMICS: A solid material obtained by heating inorganic matter.
Made with traditional pottery techniques. Objects are made out of clay and baked.
Sand is used to make glass.
Low electrical conductivity
High degree of hardness
Heat resistance, low thermal conductivity
Fragile
Can be corroded by acids and bases
and alloys
Ferrous is an adjective used to indicate the presence of iron.
The word is derived from the Latin word ferrum (iron).Ferrous metals include steel and pig iron (which contain a few percent of carbon) and alloys of iron with other metals (such as stainless steel.)
The term non-ferrous is used to indicate metals other than iron and alloys that do not contain an appreciable amount of iron.
The term non-ferrous is used to indicate metals other than iron and alloys that do not contain an appreciable amount of iron
i.e. Aluminum can .
Metals Mechanical properties
Examples of uses
Aluminum Malleability, ductility cans, electrical wires
Copper Ductility, good conductor electrical wires
Tin Very high ductility, resistance to corrosion
submarines
Zinc Hardness, resistance to corrosion
pipes
Magnesium Light, malleability rims
Chrome Very good hardness protective coatings against corrosion
Nickel Ductility, malleability coins
Lead Malleability, high density Cast iron
Tungsten Ductility , resistance to very high temperatures
Lamp filaments
An alloy is a solid solution or homogeneous mixture of two or more elements, at least one of which is a metal
i.e. Stainless steel (combination of iron and chromium)
Metalalloy
Composition Mechanical properties
Examples of uses
Cast iron Iron: 93%Carbon: >2%
Good conductivity
Frying pan
Stainless steel
Iron: 74%Chrome: 17 %Tin: 8%
DuctilityMechanical resistance
Cutlerykitchen utensils
High speed steel
Iron : 99%Carbon: 0.6-1.3%
Very good hardnessResistance to high temperatures
DrillsCutting tools
Mild steel Iron: 99%Carbon: 0.15-0.25%
HardnessWeak resistance to corrosion
Chains
Tinplate Iron: 99%Tin
Very pliableResistance to corrosion
Tin cans
Non ferrous alloys Composition Examples of uses
Brass Zinc and copper Musical instruments
Bronze Copper and tin Water faucets
Titanium Tin and aluminum Airplane pieces