C10 Using Resourses
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What are ceramics?
Non metal solids with high melting point
What is clay?
●Soft material - can be moulded ●Fired at high temperature-hardens to form clay ceramic
What is clay used for?
Pottery and bricks
Name 3 properties of glass
●Generally transparent ●moulded when hot ●brittle when thin
What is soda lime glass made from?
It’s made from heating a mixture of limestone, sand and sodium carbonate and leaving to cool
What is Borosilicate glass made from?
Mixture of sand and boron trioxide. It has a higher melting point then soda lime glass.
What is a composite?
●One materials EMBEDDED in another, fibres of material (reinforcement) are surrounded by a matrix acting as a binder
What is fibre glass made from?
Glass embedded in matrix of polymer.
What are the properties and uses of fibre glass?
●low density ●very strong Makes: skis, boats and surfboards
What is carbon fibre made from?
Made from polymer matrix, reinforcement is carbon atoms chains or carbon nanotubes.
What are the properties and uses of carbon fibre?
●strong ●light Used for: aerospace and sport car manufacture
What’s concrete made from?
Made from aggregate (sand and gravel) embedded on cement.
What are the properties and uses of concrete?
●strongUsed for: building materials - skatepark
What is wood made from?
Natural composite of cellulose fibres held by organic polymer matrix.
How is low density poly(ethene) made?
●Moderate temperature ●high pressure ●Catalyst Makes:Bags, bottles
How is high density poly(ethene) made?
●lower temperature ●pressure ●different catalystIt’s rigged so used for: water tank, drain pipe
What does Thermosoftening polymers contain?
Individual polymer chains entwined together, with WEAK forces so you can MELT and REMOULD them.
What does Thermosetting polymers contain?
Monomers that form cross-links between polymer chains-solid structure. They are STRONG, HARD and RIGID.
What are general properties of ceramics?
●insulators ●Brittle ●stiff
What are general properties of polymers?
●insulators ●flexible ●easily mouldedUsed in: Clothing, insulation in electrics
What are the properties of a metal?
●malleable●good conductors●Ductile●shiny●stiffUsed in: wires, car body, cutlery
What are the alloys bronze and brass made from?
BRONZE: Copper + tin (medals, ornaments)BRASS:Copper + Zinc (lowfriction-water taps)
What’s the formula for when iron rusts?
Iron + oxygen + water –> Hydrated iron(iii) oxide
Can a whole iron object corrode?
Yes, the exposed layer flakes of, exposing more iron till eventually it all flakes away!