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DT theory > chapter 1 (metals) > Flashcards

chapter 1 (metals) Flashcards

1
Q

three main groups of metals

A
  • ferrous
  • non- ferrous
  • alloys
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2
Q

what are ferrous metals mainly composed of?

A

ferrite or iron

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3
Q

two aesthetics of steel (in general)

A
  • dull grey colour though some are black with a rough pitted surface due to processes in their production
  • develop a surface oxide over time which is reddish brown
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4
Q

FERROUS - mild steel -

properties (3 points)

A
  • tough
  • malleable
  • magnetic
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5
Q

FERROUS -mild steel- uses (2 points)

A
  • structural steel girders

* car body panels

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6
Q

FERROUS - mild steel - advantages (4 points)

A
  • easily worked and joined even in school work shop
  • relatively cheap
  • widely available
  • can be recycled
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7
Q

FERROUS -mild steel- disadvantages (2 points)

A
  • will oxidise if left unprotected

* can only be case hardened

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8
Q

FERROUS -stainless steel- properties (3 points)

A
  • hard
  • tough
  • excellent corrosion resistance
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9
Q

FERROUS -stainless steel- uses (4 points)

A
  • cutlery
  • kitchen sinks
  • pots and pans
  • surgical instruments
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10
Q

FERROUS -stainless steel- advantages (4 points)

A
  • easily cleaned
  • doesn’t need surface finishing
  • can be recycled
  • high-lustre finish
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11
Q

FERROUS -stainless steel- disadvantages (2 points)

A
  • difficult to use &a join in school workshop

* specialist welding equipment needed for joining

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12
Q

FERROUS -carbon steel- properties (1 point)

A

•ductile

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13
Q

FERROUS -carbon steel- uses (1 point)

A

•nuts,screws,nails +general ironmongery

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14
Q

FERROUS -carbon steel- advantages (1 point)

A

•can be recycled

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15
Q

FERROUS -carbon steel- disadvantages (2 points)

A
  • will oxidise if left unprotected

* can easily be heat treated

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16
Q

what are non ferrous metals used for because they’re good conductors of heat and electricity?

A

electrical power distribution grids e.g. the national grid

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17
Q

NON-FERROUS -aluminium- properties (6 points)

A
  • lightweight
  • soft
  • ductile
  • malleable
  • good heat & electricity conductor
  • good corrosion resistance
18
Q

NON-FERROUS-aluminium-uses (4 points)

A
  • window frames
  • soft drink cans
  • kitchen foil
  • used in alloys
19
Q

NON-FERROUS -aluminium- advantages (3 points)

A
  • easily drawn into thin sheets and wires
  • can be recycled
  • easily cast
20
Q

NON-FERROUS-aluminium- disadvantages (2 points)

A
  • expensive

* difficult to weld as specialist equipment needed

21
Q

NON-FERROUS-copper-properties (4 points)

A
  • malleable
  • ductile
  • good conductor of heat&electricity
  • corrosion resistant
22
Q

NON-FERROUS-copper-uses (3 points)

A
  • electric cables
  • plumbing fittings and pipes
  • hot water cylinders
23
Q

NON-FERROUS-copper-advantages (3 points)

A
  • easily drawn into thin wires
  • can be recycled
  • easily soldered
24
Q

NON-FERROUS-copper-disadvantages (2 points)

A
  • expensive

* will tarnish over time

25
Q

NON-FERROUS-zinc-properties (1 point)

A

•excellent resistance to corrosion

26
Q

NON-FERROUS-zinc-uses (2 points)

A
  • protective coverings for railings and dustbins

* negative battery terminals

27
Q

NON-FERROUS-zinc-advantages (1 point)

A

•can be recycled

28
Q

NON-FERROUS- zinc - disadvantages (1 point)

A

•brittle

29
Q

NON-FERROUS- brass (alloy) - properties (3 points)

A
  • good resistance to corrosion
  • good fluidity, casts well
  • good conductor or heat and electricity
30
Q

NON-FERROUS- brass(alloy)- uses (2 points)

A
  • plumbing fittings

* marine fittings

31
Q

NON-FERROUS -brass (alloy)- advantages (4 points)

A
  • can be polished to get high lustre finish
  • tougher than copper
  • can be recycled
  • easily cast and turned
32
Q

NON-FERROUS-brass(alloy)-disadvantages (1 point)

A

•relatively cheap

33
Q

what is an alloy ? (+ example)

A

a metal that is formed by mixing two or more metals and sometimes other elements together
e.g. brass –> 65% copper, 35% zinc

34
Q

METAL PROPERTIES definition,materials (3), product uses(1) -ductility

A

> the ability to be drawn/stretched into thinner smaller sections
mild steel, copper, aluminium
electrical cables

35
Q

METAL PROPERTIES - definition, materials(2), product uses(1), malleability

A

> the ability to be deformed by compression without tearing or cracking
mild steel, aluminium
car body panels

36
Q

METAL PROPERTIES

definition, materials (2), product uses(7)-hardness

A

> the ability to withstand abrasive wear and indentation
stainless steel, high carbon steel
kitchen sinks, chisels, hand saws, plane blades, hacksaw blades, scrubbers + centre punches

37
Q

METAL PROPERTIES

definition, materials(1), product uses (2)- toughness

A

> the ability to withstand sudden and shock loading without fracture
mild steel
nails, screws

38
Q

METAL PROPERTIES- definition, materials(2), product uses(1)- elasticity

A

> the ability to return to original shape once the deforming force is removed
high carbon steel, silver steel
springs

39
Q

METAL STRENGTHS

definition, materials+product uses(4)- tension

A

> the ability of a material to withstand being pulled apart
carbon steel
nails, screws, nuts and bolts

40
Q

METAL STRENGTHS

definition,materials+ product uses(1)- compression

A

> the ability of a material to withstand being squashed
mild steel
car body panels

41
Q

METAL STRENGTHS

definition, materials, product uses(1)- shear

A

> the ability of a material or joint to withstand being slid or pulled apart
stainless steel
security shear nuts

DT theory (10 decks)

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