Materials And Their Properties Flashcards
Ceramics
Non-metal solids with high melting points
2 examples of ceramics
Clay
Glass
Composites
Made of 1 material embedded in another
What do the properties of a composite depend on?
Properties of the materials it is made from
4 examples of composites
Fibreglass
Carbon fibre
Concrete
Wood
What 2 things can influence the properties of a polymer?
How it’s made and what it’s made from
Low density poly(ethene)
Made from ethene
Moderate temperature under high pressure with catalyst
Flexible
Used for bags and bottles
High density poly(ethene)
Made from ethene
Lower temperature and pressure with different catalyst
More rigid
Used for water tanks and drainpipes
What determines type of bonds that form between the polymer chains?
Monomers
Thermosetting polymers
Monomers form cross-links between chains
Solid structure
Don’t soften when heated
Strong, hard and rigid
Thermosoftening polymers
Individual polymer chains
Weak forces between chains
Can melt polymers and remould
What is needed for iron to rust?
Air and water
2 main ways to prevent rusting
Coat iron with a barrier
Sacrificial method
Alloys
Made by adding an element to a metal
Disrupts structure of metal
Makes alloys harder than pure metals