Ceramics, Composites and Polymers Flashcards
(20 cards)
Examples of ceramics
Pottery, Glass, China, porcelain and silicone carbide
What is porcelain used for?
electricity pylons
How are large crystals formed?
When molten ceramics are slowly cooled
What structure do ceramics have?
Lattice structure/grid like pattern
How are the atoms held together?
Strong bonds
What m.pt do ceramics generally have?
high m.pt
How do you describe a ceramic?
Solids, strong, brittle, hard, durable, non-conductors of heat/electricity and unreactive.
What is China used for?
Tableware (Strong and heat insulator)
How are polymers formed?
The joining of many small molecules called monomers
Why are polymers elastic?
The long coiled molecules go back to their original shape when stretched
Polymers structure
Long chains of molecules made up of repeating groups of atoms
What happens if cross-links are formed across chains?
The polymer becomes harder and less easy to melt.
What are the most synthetic polymers made from?
Crude oil
Exothermic reactions
Transfers energy to its surrounding, heating up the surroundings
Endothermic reactions
Transfers energy from the surroundings so the temperature of the surrounding fall
What are composites?
Combinations of 2 or more different materials
How is concrete made?
Mixing cement, sand, aggregate and water
What is concrete used for?
Large structures
Why are composite materials useful?
They combine all the properties of all the materials they are made from
Metals can be recycled by
By separating and melting
