103618
Description
Alloys
- An alloy is a Mixture of a Metal and
Other Elements
- Alloys can be a mixture of two or more
different metals (like brass or bronze)
- They can also be a mixture of
a metal and a non-metal (like
steel)
- Alloys often have properties
that are different from the
metals they are made from-
and these new properties
often make the alloy more
useful than the pure metal
- Alloys can be a mixture of two or more
different metals (like brass or bronze)
- Steel is an Alloy of Iron and Carbon
- Steel is harder than Iron
- Steel is also stronger
than iron, as long as
the amount of carbon
does not get larger
than about 1%.
- Iron on its own will rust
fairly quickly, but steel is
much less likely to rust.
- A lot of things are made from steel- girders,
bridges, engine parts, cutlery, washing
machines, saucepans, ships, drill bits, cars etc.
- Steel is harder than Iron
- Brass, Bronze, Solder and Amalgam are also Alloys
- Brass is an alloy of copper and zinc. most of the properties of brass are just a mixture of those of the copper and zinc, although
brass is harder than either of them. Brass is used for making brass musical instruments (trumpets, trombones, French horns
etc.). it is also used for fixtures and fittings such as screws, springs, doorknobs etc.
- Bronze is an alloy of copper and tin. It's much harder and stronger
than tin, and it's more resistant to corrossion than either copper or tin.
Broze is used to make springs and motor bearings. It's also used to
make bells, and it's used in sculpture.
- Solder is usually an alloy of lead and tin. Unlike pure
materials it doesn;t have a definite melting point, but
gradually solidifies as it cools down. This is pretty useful if
you want to solder things together.
- An amalgam is an alloy containing
mercury. A large-scale use of one kind of
amalgam is in dentistry, for filling teeth.
- Modern fillings tend to be made from tooth-coloured
resin instead. This is partly because amalgam fillings
are dark silvery in colour, and thereforemrather
obvious in your mouth, and partly becasue people
worry that the mercury in the amlgam could cause
health problems (although there is not much evidence
for this).
- Modern fillings tend to be made from tooth-coloured
resin instead. This is partly because amalgam fillings
are dark silvery in colour, and thereforemrather
obvious in your mouth, and partly becasue people
worry that the mercury in the amlgam could cause
health problems (although there is not much evidence
for this).
- Brass is an alloy of copper and zinc. most of the properties of brass are just a mixture of those of the copper and zinc, although
brass is harder than either of them. Brass is used for making brass musical instruments (trumpets, trombones, French horns
etc.). it is also used for fixtures and fittings such as screws, springs, doorknobs etc.
- Some Alloys are Smart
- Nitinol is the name given to a family of
alloys of nickel and titanium that have
shape memory.
- This means they "remember" their original shape, and go
back to it even after being bent and twisted.
- This has increased the number of uses for alloys. You can get specs with
Nitinol frames- these can be bent and even sat on and they still go back into
their original shape.
- Nitinol is the name given to a family of
alloys of nickel and titanium that have
shape memory.
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