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DTE GCSE > Materials > Flashcards

Materials Flashcards

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1
Q

What sort of plastics can only be heated once?

A

Thermosetting plastics. These plastics undergo a chemical change change when heated and become hard and rigid.

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2
Q

Can thermosetting plastics be recycled?

A

No. thermosetting plastics cannot be recycled.

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3
Q

What are thermosetting plastics used for, because they resist heat so well?

A

Electrical fittings and pan handles. Also, any situation when the plastic needs to be very hard.

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4
Q

Examples of thermosetting plastics

A

Melamine-formaldehyde
Polyester resin
Epoxy resin
Urea-formaldehyde

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5
Q

What sort of plastics do not resist heat well - they can be melted and formed multiple times?

A

Thermoplastics can be melted and formed many times. When formed, they are also very bendy.

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6
Q

Are thermoplastics recyclable?

A

Yes. Thermoplastics can be melted down and reformed into a new product.

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7
Q

Examples of thermoplastics?

A 
Acrylic
ABS
Polystyrene
High Impact Polystyrene
Polythene
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8
Q

Surface finishes for plastics?

A

Plastics don’t need protective surface finishes because they are very resist pant to corrosion and decay

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9
Q

Giving a plastic surface a nice appearance.

A

Wet and dry paper (silicon carbide).
Mild abrasive polish,
Anti-static cream,
Buffing machine.

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10
Q

Plastics are made from….

A

Crude oils. They are extracted from the ground then taken to a refinery. The oils are separated. Some are used to make plastics.

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11
Q

Ferrous metals contain….

A

Iron. They are often magnetic.

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12
Q

Properties of Mild Steel?

A

Strong and cheap. Rusts easily and can’t be hardened or tempered.

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13
Q

Uses of Mild Steel?

A

Car bodies, screws, nuts, bolts, nails, washing machines.

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14
Q

Properties of High-Carbon Steel?

A

Hard and can be hardened or tempered. Unfortunately, it is hard to work and rusts.

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15
Q

Properties of Stainless Steel?

A

Hard and doesn’t rust but is expensive

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16
Q

Uses of High-Carbon Steel?

A

Drills, files, chisels and saws

17
Q

Use of Stainless Steel?

A

Medical Equipment, Sinks, Kettles, Cutlery

18
Q

What’s a Non-Ferrous Metal?

A

Doesn’t contain iron.

19
Q

Properties of Aluminium?

A

Lightweight and corrosion resistant. Expensive and not particularly strong.

20
Q

Uses of Aluminium?

A

Aeroplanes, Cans, Ladders

21
Q

Properties of Brass?

A

Quite strong, Corrosion-Resistant, Malleable, Ductile.

22
Q

Properties of Copper?

A

Malleable, Ductile and conducts electricity well.

23
Q

Uses of Copper?

A

Wiring, Pipes

24
Q

Uses of Brass?

A

Door Handles, Electrical Parts

25
Q

Common stock forms

A

Sheet, Strip, Tubing

26
Q

2 composites?

A

Glass-reinforced plastic : boats, cars

Carbon fibre reinforced plastic : protective helmets, racing cars, bulletproof vests

27
Q

Why might nano-materials be bad?

A

Harmful to environment and difficult/expensive to dispose of

28
Q

What’s a smart material?

A

A smart material are materials that react to a stimuli in their environment.

29
Q

What is annealing?

A

Metal is heated and left to cool slowly. This makes it softer, ductile and less brittle

30
Q

What is hardening?

A

Metal is heated, then cooled rapidly. Heated then put in water to cool. This leaves metal brittle, so it is often tempered afterwards.

31
Q

What is tempering?

A

Tempering makes metal tougher and less likely to break. It is done by gently heating the metal.

32
Q

Explain plastic coating.

A

Metal is heated evenly then plunged into fluidised powder for a few seconds. Metal is put back into the oven and plastic fuses to it.

33
Q

Recycling wood

A

Wood is either reclaimed or shredded to make playground flooring, chipboard or compost.

34
Q

6 R’s of recycling

A 
Repair
Reuse
Recycle
Rethink
Reduce
Refuse

DTE GCSE (10 decks)

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