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DT > Chapter 3 Metals > Flashcards

Chapter 3 Metals Flashcards

1
Q

Common forms and sizes of metals

A

Round, square, flat, pipe, sheet, angle, channel I or H section

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2
Q

What are the two main types of metal

A

Ferrous and non-ferrous

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3
Q

Define ferrous metals

A

They contain iron, they have small amounts of other metals or elements added, to give required properties

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4
Q

Properties of ferrous metals

A

They contain iron and small amounts of other metals or elements, they are magnetic and give little resistance to corrosion

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5
Q

Define non-ferrous metals

A

Don’t contain iron and are not magnetic due to this

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6
Q

Properties of non-ferrous metals

A

Don’t have any iron in them and because of this are not magnetic, more resistant to corrosion that ferrous metals

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7
Q

Define alloys

A

This is a mixture of two or more metal components

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8
Q

Properties of an alloy

A

An alloy has a lower melting point than normal metals, increased harness, strength and ductility, change colour, give better castings, change electrical and thermal properties and change resistance to corrosion

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9
Q

Properties of aluminium

A

Soft, light, ductile and malleable, has a low density and melting point. It’s strength and stiffness can be improved by alloying. Excellent conductor, easy to work with and very attractive. Good strength to weight ratio, hard to weld so used to join rivets

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10
Q

Used for aluminium

A

Drinking cans, packaging, window frames, ladders

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11
Q

Properties of aluminium alloys

A

Resist corrosion, light and attractive, soft and has low tensile strength

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12
Q

Uses for aluminium alloys

A

Engine parts, car and vehicle body and air-craft design

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13
Q

Properties of copper

A

Soft, malleable and ductile, high melting point, excellent thermal and electrical conductor, attractive finish, but expensive. Excellent anti-corrosive resistance.

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14
Q

Uses for copper

A

Decorative ornaments, hot water pipes and cylinders, electrical wires and components

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15
Q

Properties of brass

A

Lower melting point, excellent electrical conductivity and anti-corrosive properties, casts well, easily joined and polishes well.

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16
Q

Used for brass

A

Used for ornaments, musical instruments, locks, handles and hinges

17
Q

Properties of zinc

A

Hard, brittle, great anti-corrosion resistance and used in galvanising and is most familiar use of the material

18
Q

Properties of stainless steel

A

Doesn’t stain it corrode, very attractive and versatile

19
Q

Uses of stainless steel

A

Cutlery, watch cases and bands, also used in kitchen utensils and some cad exhaust systems

20
Q

Properties of medium carbon steel

A

Hard, tough with high tensile strength, less ductile than mild steel

21
Q

Uses of medium carbon steel

A

Keys, screw drivers and some gear wheels

22
Q

Properties of mild steel

A

Cheap, wears easy, excellent ductility, non-corrosive, ideal for outside work, processing is difficult

23
Q

Used for mild steel

A

Used for screws, washers, nuts and bolts, hinges, bicycle frames, some car bodies and wheelbarrows

24
Q

Properties of high carbon steel

A

Very hard and brittle, less tough and malleable, difficult to cut can withstand wear and shearing

25
Q

Define plastic coating

A

Applies a thermo plastic layer to the surface of the metal

26
Q

Properties of plastic coating

A

Provides long term corrosion, impact and chemical resistance while offering aesthetic appeal

27
Q

Define anodising

A

A natural oxide film which grows on some metals when mixed with acidic electrolytes and produces a thick coating

28
Q

Properties of anodising

A

Can improve the finish and prevents corrosion

29
Q

Define enamelling

A

Colourful results by fusing powdered glass to a substrate by firing. The powder melts and flows and hardens to a smooth durable coating on the metal, glass or ceramic

30
Q

Properties of enamelling

A

Colourful, durable, smooth, hard, chemically resistant, long lasting colours and cannot burn

31
Q

Define lacquering

A

Lacquer is a clear or coloured varnish that dries by solvent evaporation

32
Q

Properties of lacquering

A

Clear or coloured, hard durable finish

33
Q

Define electroplating

A

Process uses electrical current to transfer material from one solution and coat a conductive material

34
Q

Properties of electroplating

A

Can improve abrasion/wear resistance, corrosion protection and aesthetic qualities. It’s can also be used to build up thickness on undersized parts

35
Q

Define painting

A

Provides surface with thick coat of colour that will give lasting protection

36
Q

Properties of painting

A

Thick coat, lasting protection, not scratch resistant and will fade over time

DT (15 decks)

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