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GCSE DT > METALS > Flashcards

METALS Flashcards

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1
Q

FOUND/MADE

A 
earths crust
found as ores
1. ore crushed
2. melted in furnace
3. molten metal sinks to bottom
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2
Q

ADVANTAGES-SUSTAINABLE

A
  • long lastin

- some can be recycled

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3
Q

DISADVANTAGES-SUSTAINBLE

A
  • damages the envoirment
  • transport takes a lot of energy
  • metal ores are a finite resource
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4
Q

3 TYPES

A
  • ferrous
  • non-ferrous
  • alloy
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5
Q

MALLEABLE

A

can be easily moulded into shape e.g copper

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6
Q

DUCTILE

A

can be drawn out into a wire e.g copper

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7
Q

TOUGH

A

is more resistant to impact e.g tool steel

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8
Q

BRITTLE

A

can break when bent e.g cast iron

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9
Q

HARD

A

resistant to scratching e.g HHS, steel, brass

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10
Q

STOCK FORMS

A
  • sheet
  • bar
  • tube
  • strip
  • angle
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11
Q

ADVANTAGES OF SF

A
  • easy to know what range you need to buy in

- you can design before buying because you know that it will all work out

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12
Q

PITCH

A

the distance travelled by a nut in one revolution

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13
Q

WORK-HARDENED

A

after metal has been hit, drilled, cut

  • difficult to work with
  • brittle
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14
Q

ANNEALING

A

controlled heating- easy to work with again

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15
Q

QUENCHING

A

putting hot metal in water

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16
Q

HARDENING

A

heating steel to a specific temperature, then cooling slowly can make it hard and tough

17
Q

HEATING TO SPECIFIC TEMP FOR INTENDED PURPOSE

A
  • PALE STRAW-230-scribers
  • BROWN/PURPLE-270-scissors, press tools, knives
  • BLUE-300-needles, springs, spanners
18
Q

IRON—> STEEL

A

oxygen blown into molten iron to remove mostof the carbon

19
Q

8 WAYS YOU CAN PUT A FINISH ON A METAL (a,p,g,b,p,p,p,s)

A
  • anodising
  • polishing
  • galvanising
  • buffing
  • planishing
  • plastic dip coating
  • painting
  • sand-blasting
20
Q

BRAZING

A
  • heat is provided from buring natural gases

- filler rod is melted into heated join and sticks the two pieces of metal together

21
Q

SPOT WELDING

A
  • weld sheet metals
  • two copper alloy electrodes to concentrate the welding current + force
  • much quicker and safer than wleding with gas
22
Q

SOLDERING

A

-joins electronic components to a printed circuit board
-melted usinf a soldering iron.
(iron contains FLUX which makes it flow easily

GCSE DT (11 decks)

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