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Flashcards in Alloys Deck (26):
1

What percentage of cast iron (extracted using a blast burnace) is pure iron?

96%

2

What is the remaining percentage of cast iron?

Impurities such as carbon

3

What is one of hte only uses for cast iron?

Making ornamental railings

4

State a property of cast iron and how it affects its usefulness

Brittle

Not useful for many purposes

5

____ the impurities are removed from the blast furnace iron

All the impurities are removed from the blast furnace iron

6

Describe the atomic arrangement of pure iron

What properties does this cause, and what is the effect of it?

Regular arrangment of identical atoms

The layers of atoms can slide over each other, making it soft and very malleable.

So pure iron is too bendy for most uses

7

What is most iron used for?

Making into alloys called steels

8

How are steels formed?

By adding small amounts of carbon and sometimes other metals to the iron

9

Name the:

Type and amount of impurity

Property

Uses

of low carbon steel

Type and amount of impurity:

0.1% carbon

Property:

Easily shaped

Uses:

Car bodies

10

Name the:

Type and amount of impurity

Properties

Uses

of high carbon steel

Type and amount of impurity:

1.5% carbon

Property:

Very hard, inflexible

Uses:

1. Blades for cutting tools

2. Bridges

11

Name the:

Type of impurity

Property

Uses

of stainless steel

Type of impurity:

Chromium, sometimes nickel

Property:

Corrosion-resistant

Uses:

1. Cutlery

2. Containers for corrosive substances

12

Name a problematic property of iron

It goes rusty if it is exposed to ait and water

13

Alloys are ____ than pure metals

Alloys are harder than pure metals

14

Explain, using the arrangement of atoms, why alloys are harder than pure metals

The regular arrangement of the metal atoms is disrupted by the addition of other different sized elements, which upset the layers of atoms, making it harder for them to slide over each other.

So alloys are harder

 

15

What is bronze an alloy of?

Copper and tin

16

Why might you want to create bronze instead of using copper?

When might you want to use bronze?

Bronze is harder than copper

Good for making medals and statues from

17

What is cupronickel an alloy of?

Copper and nickle

18

Name 2 useful properties of cupronickel

1. Hard

2. Corrosion resistant

 

19

What is cupronickel used for?

To make 'silver' coins

20

Why are gold alloys used to make jewellery?

Pure gold is too soft

21

Name 5 metals that are added to gold to make it harder

1. Zinc

2. Copper

3. Silver

4. Palladium

5. Nickel

22

Aluminium alloys are used to make ____

Aluminium alloys are used to make aircraft

23

What property of alluminium makes it good for use in making aircraft?

What property lets it down, and what is done about this?

It has a low density

It is alloyed with small amounts of other metals to make it stronger

24

Now we understand a lot about the ____ of metals, alloys can be ____ for ____ ____

Now we understand a lot about the properties of metals, alloys can be designed for specific uses

25

Give 2 general examples of when you might want to make an alloy

1. Make it a lot harder than the original metal

2. Make it less brittle than the original metal

26

Why are alloys generally so great?

Their properties can be varied and they can be made to suit a particular job really well