Alloys Flashcards
What is an alloy
When scientists mix to metals together (or mix a metal with a non-metal)
Iron from the blast furnace is only how much percent?
96% Iron – the 4% is carbon
What is impure iron used as
Cast iron- it’s handy for making ornamental railings although it’s brittle
If I and is impure what happens
The impurities are removed from most of the blast furnace Iron
What arrangement does pure iron have?
Pure iron has a rectangular arrangement of identical atoms. The layers of atoms can slide over each other which makes the iron soft and easily shaped – this iron is far too Bendy for most other uses
What is most Iron converted into?
Alloys called steels.
How are steels formed from Iron
Steels are formed by adding small amounts of carbon and sometimes other metals into the iron
What’s the properties of stainless steel
It’s corrosion resistant
What’s the properties of low carbon steel and high carbon steel
Low carbon is easily shaped
High carbon steel is very hard and inflexible
Why are alloys harder than pure metals ?
Different elements have difference sized atoms so when as element is added to a pure metal, the smaller elements smaller atoms will upset the layers of pure metal atoms - making it more difficult for them to slide other eachother
Copper+Tin=
Bronze
Bronze is harder than copper, and it’s good for making medals and statuses
Copper+nickel=
Cupronickel
This is hard and corrosive resistant - used to make silver coins
Gold is too soft to make jewellery, so what is added?
Either
Zinc, copper , silver , palladium or nickel
How is aluminium made stronger?
Other metals are added to make it stronger
